ci: speed up build with crystal arm64 binary

Chore/documentation

.dockerignore

@@ -1,6 +1,5 @@
 .git
 /bin/
 /.shards/
-/bruno/
 /spec/
 /sqlite/

.github/workflows/publish.yml

@@ -1,4 +1,4 @@
-name: Publish Docker image
+name: Publish Docker images
 
 on:
   push:
@@ -8,43 +8,65 @@ on:
     types: [published]
 
 jobs:
-  push_to_registry:
-    name: Push Docker image to Docker Hub
+  build-platforms:
+    name: Build Platforms
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform: [linux/amd64, linux/arm64]
     permissions:
-      packages: write
       contents: read
-      attestations: write
-      id-token: write
+      packages: write
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
+
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Extract version tag
-        id: extract_tag
-        if: github.event_name == 'release'
-        run: echo "RELEASE_TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
-      - name: Build and push image
-        id: push
-        uses: docker/build-push-action@v5.0.0
+
+      - name: Extract version
+        id: version
+        run: |
+          VERSION=$(grep '^version:' shard.yml | cut -d ' ' -f 2)
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Build and push platform image
+        uses: docker/build-push-action@v5
+        env:
+          CRYSTAL_WORKERS: ${{ matrix.platform == 'linux/amd64' && 4 || 2 }}
         with:
           context: .
+          platforms: ${{ matrix.platform }}
           push: true
-          platforms: linux/amd64,linux/arm64
           tags: |
-            sjdonado/url-shortener:latest
-            ${{ github.event_name == 'release' && 'sjdonado/url-shortener:${{ env.RELEASE_TAG }}' || '' }}
-      - name: Attest
-        uses: actions/attest-build-provenance@v1
-        id: attest
+            sjdonado/bit:${{ github.event_name == 'release' && steps.version.outputs.version || 'latest' }}-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          build-args: |
+            TARGETARCH=${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  create-manifest:
+    name: Create Manifest
+    runs-on: ubuntu-latest
+    needs: build-platforms
+    permissions:
+      packages: write
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
         with:
-          subject-name: sjdonado/url-shortener
-          subject-digest: ${{ steps.push.outputs.digest }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Create manifest
+        run: |
+          docker buildx imagetools create \
+            -t sjdonado/bit:${{ github.event_name == 'release' && needs.build-platforms.outputs.version || 'latest' }} \
+            sjdonado/bit:${{ github.event_name == 'release' && needs.build-platforms.outputs.version || 'latest' }}-{amd64,arm64}

.gitignore

@@ -1,4 +1,3 @@
-/docs/
 /lib/
 /bin/
 /.shards/
@@ -7,3 +6,5 @@
 
 /sqlite/
 .env.production
+
+resource_usage.txt

CODE_OF_CONDUCT.md

@@ -0,0 +1,132 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official email address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+[INSERT CONTACT METHOD].
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+[https://www.contributor-covenant.org/version/2/0/code_of_conduct.html][v2.0].
+
+Community Impact Guidelines were inspired by 
+[Mozilla's code of conduct enforcement ladder][Mozilla CoC].
+
+For answers to common questions about this code of conduct, see the FAQ at
+[https://www.contributor-covenant.org/faq][FAQ]. Translations are available 
+at [https://www.contributor-covenant.org/translations][translations].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.0]: https://www.contributor-covenant.org/version/2/0/code_of_conduct.html
+[Mozilla CoC]: https://github.com/mozilla/diversity
+[FAQ]: https://www.contributor-covenant.org/faq
+[translations]: https://www.contributor-covenant.org/translations

CONTRIBUTING.md

@@ -0,0 +1,75 @@
+# Contributing Guidelines
+
+We welcome contributions from the community! Please follow these guidelines to help maintain consistency and quality in the project.
+
+## Code of Conduct
+This project adheres to the [Contributor Covenant Code of Conduct](CODE_OF_CONDUCT.md). By participating, you agree to uphold its terms.
+
+## How to Contribute
+
+### 1. Fork the Repository
+Click the "Fork" button at the top-right of the [repository page](https://github.com/sjdonado/bit).
+
+### 2. Clone Your Fork
+```bash
+git clone https://github.com/YOUR_USERNAME/bit.git
+cd bit
+```
+
+### 3. Create a Feature Branch
+```bash
+git checkout -b feat/your-feature-name
+```
+
+### or for bug fixes:
+
+```bash
+git checkout -b fix/issue-description
+```
+
+### 4. Develop Your Changes
+- Check [Local Development](docs/SETUP.md#local-development) guidelines
+- Ensure changes match the project scope
+- Write clear commit messages
+- Include tests for new functionality
+- Update documentation when applicable
+
+### 5. Commit Changes
+```bash
+git commit -am 'Add descriptive commit message'
+```
+
+### 6. Push to GitHub
+```bash
+git push origin your-branch-name
+```
+
+### 7. Create a Pull Request
+1. Go to the [original repository](https://github.com/sjdonado/bit)
+2. Click "New Pull Request"
+3. Select your fork and branch
+4. Add a clear description including:
+   - Purpose of changes
+   - Related issues (if applicable)
+   - Testing performed
+
+## Pull Request Guidelines
+- Keep PRs focused on a single feature/bugfix
+- Ensure all tests pass
+- Update documentation in the same PR
+- Use descriptive titles (e.g., "Add URL validation" not "Update code")
+- Reference related issues using #issue-number
+
+## Reporting Issues
+When opening an issue, please include:
+1. Description of the problem
+2. Steps to reproduce
+3. Expected vs actual behavior
+4. Environment details (OS, Crystal version, etc)
+
+For feature requests:
+- Explain the problem you're trying to solve
+- Suggest potential implementations
+
+## License
+By contributing, you agree that your contributions will be licensed under the [license](LICENSE).

Dockerfile

@@ -1,19 +1,47 @@
-FROM alpine:edge as base
+FROM debian:bookworm-slim AS build
+
+ARG TARGETARCH
+ENV ENV=production
 WORKDIR /usr/src/app
 
-RUN apk add crystal shards sqlite-dev openssl-dev
+RUN apt-get update && apt-get install -y \
+    curl \
+    gnupg \
+    ca-certificates \
+    && mkdir -p /etc/apt/keyrings \
+    && curl -fsSL https://packagecloud.io/84codes/crystal/gpgkey | gpg --dearmor > /etc/apt/trusted.gpg.d/84codes_crystal.gpg \
+    && echo "deb [signed-by=/etc/apt/trusted.gpg.d/84codes_crystal.gpg] https://packagecloud.io/84codes/crystal/debian/ bookworm main" > /etc/apt/sources.list.d/84codes_crystal.list
+
+RUN apt-get update && apt-get install -y \
+    crystal \
+    libssl-dev \
+    libyaml-dev \
+    libsqlite3-dev \
+    libevent-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY . .
+
+RUN shards install --production
+RUN shards build --release --no-debug --progress --stats
+
+FROM debian:bookworm-slim AS runtime
 
-FROM base AS build
 ENV ENV=production
-COPY . . 
+WORKDIR /usr/src/app
 
-RUN shards install
-RUN shards build --progress
+RUN apt-get update && apt-get install -y \
+    libssl3 \
+    libyaml-0-2 \
+    libsqlite3-0 \
+    libevent-2.1-7 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p sqlite
 
-FROM base AS release
-RUN mkdir -p /usr/src/app/sqlite
 COPY --from=build /usr/src/app/db db
+COPY --from=build /usr/src/app/data data
 COPY --from=build /usr/src/app/bin /usr/local/bin
 
 EXPOSE 4000/tcp
-CMD ["url-shortener"]
+CMD ["bit"]

README.md

@@ -1,138 +1,28 @@
-# url-shortener
-> Lightning fast, lightweight and minimal self-hosted url shortener
+[![Docker Pulls](https://img.shields.io/docker/pulls/sjdonado/bit.svg)](https://hub.docker.com/r/sjdonado/bit)
+[![Docker Stars](https://img.shields.io/docker/stars/sjdonado/bit.svg)](https://hub.docker.com/r/sjdonado/bit)
+[![Docker Image Size](https://img.shields.io/docker/image-size/sjdonado/bit/latest)](https://hub.docker.com/r/sjdonado/bit)
 
-## Benchmark
-```shell
-./benchmark.sh
-Semaphore initialized with 2666 slots.
-Setup...
-[+] Running 1/0
- ✔ Container url-shortener-app-1  Running                                                                                                                                                                                   0.0s
-2024-05-20T16:39:53.818306Z   INFO - micrate: No migrations to run. current version: 20240513130054
-Captured API Key: 4y2mblZDneZLcI-YywHGFA
-Waiting for database to be ready...
-Creating 1000 short links...
-Created short link 100/1000
-Created short link 200/1000
-Created short link 300/1000
-Created short link 400/1000
-Created short link 500/1000
-Created short link 600/1000
-Created short link 700/1000
-Created short link 800/1000
-Created short link 900/1000
-Created short link 1000/1000
-Accessing each link 10 times concurrently...
-****Results****
-Average Memory Usage: 11.00 MiB
-Average Response Time: 5.28 µs
-[+] Running 2/2
- ✔ Container url-shortener-app-1  Removed                                                                                                                                                                                  10.2s
- ✔ Network url-shortener_default  Removed
-```
+# Bit URL Shortener
 
-## Self-hosted
+Lightweight URL shortener service with minimal resource requirements. Average memory consumption is **20MB RAM** with container disk space under **50MB**.
 
-- Run via docker-compose
+Bit is highly performant, achieving over 850 requests per second with an average latency of just 118ms. For detailed benchmark results, see [benchmark](docs/SETUP.md#benchmark).
+
+Images available on [Docker Hub](https://hub.docker.com/r/sjdonado/bit/tags).
+
+## Quick Start
 ```bash
-docker-compose up
-
-docker-compose exec -it app migrate
-docker-compose exec -it app cli --create-user=Admin
+docker run -p 4000:4000 -e ADMIN_API_KEY=$(openssl rand -base64 32) sjdonado/bit:latest
 ```
 
-- Run via docker cli
-```bash
-docker run \
-    --name url-shortener \
-    -p 4000:4000 \
-    -e ENV="production" \
-    -e DATABASE_URL="sqlite3://./sqlite/data.db?journal_mode=wal&synchronous=normal&foreign_keys=true" \
-    -e APP_URL="http://localhost:4000" \
-    sjdonado/url-shortener
+## Minimum Requirements
+- 50MB disk space
+- 50MB RAM (20MB avg usage)
+- x86_64 or ARM64 architecture
 
-docker exec -it url-shortener migrate
-docker exec -it url-shortener cli --create-user=Admin
-```
-
-- Dokku
-```dockerfile
-FROM sjdonado/url-shortener
-```
-
-```bash
-dokku apps:create url-shortener
-
-dokku domains:set url-shortener bit.donado.co 
-dokku letsencrypt:enable url-shortener
-
-dokku storage:ensure-directory url-shortener-sqlite
-dokku storage:mount url-shortener /var/lib/dokku/data/storage/url-shortener-sqlite:/usr/src/app/sqlite/
-
-dokku config:set url-shortener DATABASE_URL="sqlite3://./sqlite/data.db?journal_mode=wal&synchronous=normal&foreign_keys=true" APP_URL=https://bit.donado.co
-
-dokku ports:add url-shortener http:80:4000
-dokku ports:add url-shortener https:443:4000
-
-dokku run url-shortener migrate
-dokku run url-shortener cli --create-user=Admin
-```
-
-## Usage
-
-**REST API**
-
-| Endpoint | HTTP Method | Description | Payload |
-|----------|-------------|-------------|---------|
-| `/api/ping` | GET | Ping the API to check if it's running | - |
-| `/:slug` | GET | Retrieve a link by its slug | - |
-| `/api/links` | GET | Retrieve all links | - |
-| `/api/links` | POST | Create a new link | `{"url": "https://example.com"}` |
-| `/api/links/:id` | PUT | Update an existing link by its ID | `{"url": "https://newexample.com"}` |
-| `/api/links/:id` | DELETE | Delete a link by its ID | - |
-
-**CLI**
-```
-Usage: ./cli [options]
-Options:
-  --create-user=NAME  Create a new user with the given name
-  --list-users        List all users
-  --delete-user=USER_ID Delete a user by ID
-```
-
-## Development
-
-**Installation**
-
-```bash
-brew tap amberframework/micrate
-brew install micrate
-```
-
-```bash
-shards run migrate
-shards run url-shortener
-```
-
-**Generate the `X-Api-Key`**
-
-```bash
-shards run cli -- --create-user=Admin
-```
-
-## Run tests
-```bash
-ENV=test crystal spec
-```
+## Documentation
+- [API Reference](docs/API.md)
+- [Advanced Setup](docs/SETUP.md)
 
 ## Contributing
-
-1. Fork it (<https://github.com/sjdonado/url-shortener/fork>)
-2. Create your feature branch (`git checkout -b my-new-feature`)
-3. Commit your changes (`git commit -am 'Add some feature'`)
-4. Push to the branch (`git push origin my-new-feature`)
-5. Create a new Pull Request
-
-## Contributors
-
-- [sjdonado](https://github.com/sjdonado) - creator and maintainer
+Found an issue or have a suggestion? Please follow our [contribution guidelines](CONTRIBUTING.md).

app/config/env.cr

@@ -1,6 +1,15 @@
+require "log"
+
 ENV["ENV"] ||= "development"
+ENV["APP_URL"] ||= "http://localhost:4000"
+ENV["DATABASE_URL"] ||= "sqlite3://./sqlite/data.db?journal_mode=wal&synchronous=normal&foreign_keys=true
+"
 
 {% if env("ENV") != "production" %}
   require "dotenv"
   Dotenv.load ".env.#{ENV["ENV"]}" # File must exist in non-production!
 {% end %}
+
+{% if env("ENV") == "production" %}
+  Log.setup(:error)
+{% end %}

app/config/kemal.cr

@@ -3,3 +3,5 @@ require "kemal"
 Kemal.config.env = ENV["ENV"]? || "development"
 Kemal.config.port = ENV["PORT"]?.try(&.to_i) || 4000
 Kemal.config.host_binding = ENV["HOST"]? || "0.0.0.0"
+
+Kemal.config.powered_by_header = false

app/controllers/link.cr

@@ -1,4 +1,7 @@
 require "uuid"
+require "user_agent_parser"
+
+UserAgent.load_regexes(File.read("data/regexes.yaml"))
 
 require "../lib/controller.cr"
 
@@ -6,23 +9,34 @@ module App::Controllers::Link
   class Create < App::Lib::BaseController
     include App::Models
     include App::Lib
+    include App::Services
 
     def call(env)
       user = env.get("user").as(User)
       body = parse_body(env, ["url"])
+      url = body["url"].to_s
+
+      query = Database::Query.where(url: url, user_id: user.id.as(String)).limit(1)
+      existing_link = Database.all(Link, query, preload: [:clicks]).first?
+      if existing_link
+        response = {"data" => App::Serializers::Link.new(existing_link)}
+        return response.to_json
+      end
 
       link = Link.new
       link.id = UUID.v4.to_s
-      link.url = body["url"].to_s
-      link.slug = Random::Secure.urlsafe_base64(4)
+      link.url = url
       link.user = user
+      link.slug = SlugService.shorten_url(url, user.id.to_s)
 
       changeset = Database.insert(link)
       if !changeset.valid?
         raise App::UnprocessableEntityException.new(env, map_changeset_errors(changeset.errors))
       end
 
+      link.clicks = [] of App::Models::Click
       response = {"data" => App::Serializers::Link.new(link)}
+
       response.to_json
     end
   end
@@ -38,11 +52,26 @@ module App::Controllers::Link
       raise App::NotFoundException.new(env) if !link
 
       spawn do
-        link.click_counter = link.click_counter! + 1
+        user_agent_str = env.request.headers["User-Agent"]? || "Unknown"
+        user_agent = user_agent_str != "Unknown" ? UserAgent.new(user_agent_str) : nil
 
-        changeset = Database.update(link)
+        language_header = env.request.headers["Accept-Language"]? || "Unknown"
+        language = language_header.split(',').first.split(';').first
+
+        referer = env.request.headers["Referer"]?
+
+        click = Click.new
+        click.id = UUID.v4.to_s
+        click.link = link
+        click.language = language
+        click.user_agent = user_agent_str
+        click.browser = user_agent ? user_agent.family : "Unknown"
+        click.os = user_agent ? (user_agent.os.try &.family || "Unknown") : "Unknown"
+        click.source = referer ? URI.parse(referer).host : "Unknown"
+
+        changeset = Database.insert(click)
         if changeset.errors.any?
-          Log.error { "Increase click counter failed: #{changeset.errors}" }
+          Log.error { "Logging click event failed: #{changeset.errors}" }
         end
       end
 
@@ -61,31 +90,58 @@ module App::Controllers::Link
       user = env.get("user").as(User)
 
       query = Database::Query.where(user_id: user.id.as(String))
-      links = Database.all(Link, query)
+      links = Database.all(Link, query, preload: [:clicks])
 
       response = {"data" => links.map { |link| App::Serializers::Link.new(link) }}
       response.to_json
     end
   end
 
+  class Get < App::Lib::BaseController
+    include App::Models
+    include App::Lib
+
+    def call(env)
+      user = env.get("user").as(User)
+      link_id = env.params.url["id"]
+
+      query = Database::Query.where(id: link_id.as(String), user_id: user.id.as(String)).limit(1)
+      link = Database.all(Link, query, preload: [:clicks]).first?
+
+      raise App::NotFoundException.new(env) if link.nil?
+
+      response = {"data" => App::Serializers::Link.new(link)}
+      response.to_json
+    end
+  end
+
   class Update < App::Lib::BaseController
     include App::Models
     include App::Lib
+    include App::Services
 
     def call(env)
       user = env.get("user").as(User)
       id = env.params.url["id"]
       body = parse_body(env, ["url"])
 
-      link = Database.get(Link, id)
-      raise App::NotFoundException.new(env) if !link
+      query = Database::Query.where(id: id).limit(1)
+      link = Database.all(Link, query, preload: [:clicks]).first?
 
-      if link.user_id != user.id
-        raise App::ForbiddenException.new(env)
+      raise App::NotFoundException.new(env) if link.nil?
+      raise App::ForbiddenException.new(env) if link.user_id != user.id
+
+      new_url = body["url"].to_s
+
+      existing_query = Database::Query.where(url: new_url, user_id: user.id.to_s).limit(1)
+      existing_link = Database.all(Link, existing_query).first?
+
+      if existing_link
+        raise App::UnprocessableEntityException.new(env, { "url" => ["URL already exists"] })
       end
 
-      link.url = body["url"].to_s
-      link.click_counter = 0
+      link.url = new_url
+      link.slug = SlugService.shorten_url(new_url, user.id.to_s)
 
       changeset = Database.update(link)
       if !changeset.valid?

app/lib/database.cr

@@ -1,5 +1,6 @@
 require "sqlite3"
 require "crecto"
+require"micrate"
 
 module App::Lib
   class Database
@@ -14,5 +15,12 @@ module App::Lib
     if ENV["ENV"] == "development"
       Crecto::DbLogger.set_handler(STDOUT)
     end
+
+    def self.run_migrations
+      Micrate::DB.connection_url = ENV["DATABASE_URL"]
+      Micrate::Cli.run_up
+    end
+
+    run_migrations
   end
 end

app/lib/errors.cr

@@ -1,8 +1,18 @@
 require "kemal"
 
 module App
+  class InternalServerErrorException < Kemal::Exceptions::CustomException
+    def initialize(context)
+      context.response.content_type = "application/json"
+      context.response.status_code = 500
+      context.response.print({ "error" => "Internal Server Error" }.to_json)
+      super(context)
+    end
+  end
+
   class BadRequestException < Kemal::Exceptions::CustomException
     def initialize(context, message : String)
+      context.response.content_type = "application/json"
       context.response.status_code = 400
       context.response.print({ "error" => message }.to_json)
       super(context)
@@ -11,13 +21,16 @@ module App
 
   class UnauthorizedException < Kemal::Exceptions::CustomException
     def initialize(context)
+      context.response.content_type = "application/json"
       context.response.status_code = 401
+      context.response.print({ "error" => "Unauthorized access" }.to_json)
       super(context)
     end
   end
 
   class ForbiddenException < Kemal::Exceptions::CustomException
     def initialize(context)
+      context.response.content_type = "application/json"
       context.response.status_code = 403
       context.response.print({ "error" => "Access not allowed" }.to_json)
       super(context)
@@ -26,16 +39,28 @@ module App
 
   class NotFoundException < Kemal::Exceptions::CustomException
     def initialize(context)
+      context.response.content_type = "application/json"
       context.response.status_code = 404
+      context.response.print({ "error" => "Resource not found" }.to_json)
       super(context)
     end
   end
 
   class UnprocessableEntityException < Kemal::Exceptions::CustomException
     def initialize(context, message : Hash(String, Array(String)))
+      context.response.content_type = "application/json"
       context.response.status_code = 422
       context.response.print({ "errors" => message }.to_json)
       super(context)
     end
   end
 end
+
+error 500 do |env|
+  App::InternalServerErrorException.new(env)
+  ""
+end
+
+error 404 do |env|
+  ""
+end

app/models/click.cr

@@ -0,0 +1,18 @@
+require "crecto"
+
+module App::Models
+  class Click < Crecto::Model
+    schema :clicks do
+      field :id, String, primary_key: true
+      field :user_agent, String
+      field :language, String
+      field :browser, String
+      field :os, String
+      field :source, String
+
+      belongs_to :link, Link
+    end
+
+    validate_required [:user_agent, :language, :source]
+  end
+end

app/models/link.cr

@@ -9,14 +9,14 @@ module App::Models
       field :id, String, primary_key: true
       field :slug, String
       field :url, String
-      field :click_counter, Int64, default: 0
 
       belongs_to :user, User
+      has_many :clicks, Click
     end
 
     unique_constraint :slug
 
     validate_required [:slug, :url]
-    validate_format :url, /\A(?:https?:\/\/)?(?:[\w-]+\.)+[\w-]+(?:\/\S*)?/
+    validate_format :url, /\A(?:(https?:\/\/)?(?:[\w-]+\.)+[a-z]{2,})(?::\d+)?(?:[\/?#]\S*)?\z/i
   end
 end

app/routes.cr

@@ -4,7 +4,7 @@ module App
   before_all do |env|
     env.response.headers["Access-Control-Allow-Origin"] = "*"
     env.response.headers["Access-Control-Allow-Methods"] = "GET, POST, PUT, DELETE, OPTIONS"
-    env.response.headers["Access-Control-Allow-Headers"] = "Content-Type, Accept, X-Api-Key"
+    env.response.headers["Access-Control-Allow-Headers"] = "Content-Type, Accept, Origin, X-Api-Key"
   end
 
   after_all do |env|
@@ -23,6 +23,10 @@ module App
     Controllers::Link::All.new.call(env)
   end
 
+  get "/api/links/:id" do |env|
+    Controllers::Link::Get.new.call(env)
+  end
+
   post "/api/links" do |env|
     Controllers::Link::Create.new.call(env)
   end

app/serializers/click.cr

@@ -0,0 +1,22 @@
+require "json"
+
+require "../models/click"
+
+module App::Serializers
+  class Click
+    def initialize(@click : App::Models::Click)
+    end
+
+    def to_json(builder : JSON::Builder)
+      builder.object do
+        builder.field("id", @click.id)
+        builder.field("user_agent", @click.user_agent)
+        builder.field("language", @click.language)
+        builder.field("browser", @click.browser)
+        builder.field("os", @click.os)
+        builder.field("source", @click.source)
+        builder.field("created_at", @click.created_at)
+      end
+    end
+  end
+end

app/serializers/link.cr

@@ -1,6 +1,7 @@
 require "json"
 
 require "../models/link"
+require "./click"
 
 module App::Serializers
   class Link
@@ -15,7 +16,7 @@ module App::Serializers
         builder.field("id", @link.id)
         builder.field("refer", @refer)
         builder.field("origin", @link.url)
-        builder.field("clicks", @link.click_counter)
+        builder.field("clicks", @link.clicks.map { |click| App::Serializers::Click.new(click) })
       end
     end
   end

app/services/cli.cr

@@ -3,11 +3,11 @@ require "../lib/*"
 require "../models/*"
 
 module App::Services::Cli
-  def self.create_user(name)
+  def self.create_user(name, api_key = nil)
     user = App::Models::User.new
     user.id = UUID.v4.to_s
     user.name = name
-    user.api_key = Random::Secure.urlsafe_base64()
+    user.api_key = api_key || Random::Secure.urlsafe_base64()
 
     changeset = App::Lib::Database.insert(user)
     return changeset.errors if !changeset.valid?
@@ -35,4 +35,22 @@ module App::Services::Cli
 
     "User with ID #{user_id} deleted successfully"
   end
+
+  def self.setup_admin_user
+    admin_name = ENV["ADMIN_NAME"]?
+    admin_api_key = ENV["ADMIN_API_KEY"]?
+
+    if admin_name && admin_api_key
+      query = App::Lib::Database::Query.where(name: admin_name, api_key: admin_api_key).limit(1)
+      existing_user = App::Lib::Database.all(App::Models::User, query).first?
+
+      return if existing_user
+
+      puts "Admin user setup detected. Creating admin user..."
+      result = create_user(admin_name, admin_api_key)
+      puts result
+    else
+      puts "Admin setup skipped: Missing ADMIN_NAME or ADMIN_API_KEY environment variables."
+    end
+  end
 end

app/services/slug.cr

@@ -0,0 +1,12 @@
+require "digest"
+require "base64"
+
+module App::Services::SlugService
+  def self.shorten_url(url : String, user_id : String) : String
+    combined = "#{user_id}-#{url}"
+    crc32_hash = Digest::CRC32.digest(combined)
+    base62_encoded = Base64.urlsafe_encode(crc32_hash).strip.tr("-_=", "")
+
+    base62_encoded
+  end
+end

benchmark.sh

@@ -1,145 +1,156 @@
 #!/bin/bash
 
-api_url="http://localhost:4001/api/links"
-num_links=1000
-num_requests=10
-resource_usage_interval=1  # Interval in seconds for resource usage logging
+# Configuration variables
+server_url="http://localhost:4000"
+api_url="${server_url}/api/links"
+num_links=10000
+num_requests=10000
+concurrency=100
+resource_usage_interval=1
+container_name="bit"
 
-semaphore="/tmp/semaphore"
-max_concurrent_processes=$(ulimit -u)  # Adjust this number based on your system's capability
+check_dependencies() {
+    if ! command -v bombardier &> /dev/null; then
+        echo "Error: bombardier is not installed. Please install it to proceed."
+        exit 1
+    fi
 
-# Initialize semaphore
-mkfifo $semaphore
-exec 3<> $semaphore
-rm $semaphore
+    if ! command -v jq &> /dev/null; then
+        echo "Error: jq is not installed. Please install it to proceed."
+        exit 1
+    fi
+}
 
-for ((i=0; i<max_concurrent_processes; i++)); do
-    echo >&3
-done
+setup_containers() {
+    echo "Setting up..."
+    docker compose up -d
+    if [ $? -ne 0 ]; then
+        echo "Failed to start Docker containers."
+        exit 1
+    fi
 
-echo "Semaphore initialized with $max_concurrent_processes slots."
+    output=$(docker compose exec -T app cli --create-user=Admin)
+    api_key=$(echo "$output" | awk -F' ' '/X-Api-Key:/{print $NF}')
+    echo "Captured API Key: $api_key"
 
-function get_resource_usage {
-    while true; do
-        docker stats --no-stream --format "{{.MemUsage}} {{.CPUPerc}}" url-shortener >> resource_usage.txt
+    if [[ -z "$api_key" ]]; then
+        echo "Error: API key could not be retrieved."
+        exit 1
+    fi
+
+    echo "Waiting for the application to be ready..."
+    until curl --silent --head --fail --header "X-Api-Key: $api_key" "$server_url/api/ping"; do
+        sleep 2
+    done
+}
+
+monitor_resource_usage() {
+    echo "Starting resource usage monitoring..."
+    echo "Timestamp,CPU,Memory" > resource_usage.csv
+    while :; do
+        stats=$(docker stats --no-stream --format "{{.CPUPerc}},{{.MemUsage}}" $container_name)
+        cpu=$(echo $stats | awk -F',' '{print $1}' | sed 's/%//')
+        mem=$(echo $stats | awk -F',' '{print $2}' | awk '{print $1}')
+        timestamp=$(date +%s)
+        echo "$timestamp,$cpu,$mem" >> resource_usage.csv
         sleep $resource_usage_interval
     done
 }
 
-function calculate_average_usage {
+create_links() {
+    local temp_file=$(mktemp)
+
+    echo "Creating $num_links short links with $concurrency conrurrent requests..."
+
+    # Populate URLs into a file to feed into curl
+    for ((i=1; i<=num_links; i++)); do
+        url="https://example.com/${i}-${num_links}"
+        echo "--next" >> "$temp_file"
+        echo "--request POST" >> "$temp_file"
+        echo "--url \"$api_url\"" >> "$temp_file"
+        echo "--header \"X-Api-Key: $api_key\"" >> "$temp_file"
+        echo "--header \"Content-Type: application/json\"" >> "$temp_file"
+        echo "--data \"{ \\\"url\\\": \\\"$url\\\" }\"" >> "$temp_file"
+    done
+
+    curl --parallel --parallel-immediate --parallel-max $concurrency --config "$temp_file" --silent --write-out "%{http_code}\n" > /dev/null
+
+    echo "Link creation complete: $num_links links created."
+
+    # Clean up
+    rm -f "$temp_file"
+}
+
+run_benchmark() {
+    echo "Fetching all created links from /api/links..."
+    all_links_response=$(curl --silent --request GET \
+                              --url "$api_url" \
+                              --header "X-Api-Key: $api_key" \
+                              --header "Content-Type: application/json")
+
+    links=($(echo "$all_links_response" | jq -r '.data[] | .refer'))
+    if [[ ${#links[@]} -ne $num_links ]]; then
+        echo "Error: Expected $num_links links but found ${#links[@]}."
+        exit 1
+    fi
+
+    random_link="${links[RANDOM % ${#links[@]}]}"
+    echo "Selected link for benchmarking: $random_link"
+
+    echo "Starting benchmark with Bombardier..."
+    bombardier -c $concurrency -n $num_requests "$random_link"
+    echo "Benchmark completed."
+}
+
+analyze_resource_usage() {
+    echo "Analyzing resource usage..."
+    total_cpu=0
     total_mem=0
     count=0
 
-    while read -r line; do
-        mem=$(echo $line | awk '{print $1}')
+    while IFS=',' read -r timestamp cpu mem; do
+        # Skip header line and lines with empty cpu or mem values
+        if [[ $timestamp != "Timestamp" && -n $cpu && -n $mem ]]; then
+            mem=${mem%MiB}
 
-        # Convert memory to MiB if necessary
-        if [[ $mem == *MiB ]]; then
-            mem=$(echo $mem | sed 's/MiB//')
-        elif [[ $mem == *GiB ]]; then
-            mem=$(echo $mem | sed 's/GiB//')
-            mem=$(echo "$mem * 1024" | bc)
+            total_cpu=$(echo "$total_cpu + $cpu" | bc)
+            total_mem=$(echo "$total_mem + $mem" | bc)
+            ((count++))
         fi
+    done < resource_usage.csv
 
-        total_mem=$(echo "$total_mem + $mem" | bc)
-        ((count++))
-    done < resource_usage.txt
+    avg_cpu=0.00
+    avg_mem=0.00
 
-    avg_mem=$(echo "scale=2; $total_mem / $count" | bc)
-    rm resource_usage.txt
+    if (( count > 0 )); then
+        avg_cpu=$(echo "scale=2; $total_cpu / $count" | bc)
+        avg_mem=$(echo "scale=2; $total_mem / $count" | bc)
+    fi
 
+    echo "**** Results ****"
+    echo "Average CPU Usage: $avg_cpu%"
     echo "Average Memory Usage: $avg_mem MiB"
 }
 
-function measure {
-    total_time=0
-    declare -a refer_links
-
-    # Start resource usage logging in the background
-    nohup bash -c "$(declare -f get_resource_usage); get_resource_usage" &> /dev/null &
-    resource_usage_pid=$!
-    disown
-
-    echo "Creating $num_links short links..."
-    for ((i=1; i<=num_links; i++)); do
-        response=$(curl --silent --request POST \
-                        --url $api_url \
-                        --header "X-Api-Key: $api_key" \
-                        --header "Content-Type: application/json" \
-                        --data "{ \"url\": \"https://kagi.com\" }")
-
-        refer=$(echo $response | awk -F'"' '/"refer":/{print $(NF-1)}')
-        if [[ -n $refer ]]; then
-            refer_links+=("$refer")
-            if (( i % 100 == 0 )); then
-                echo "Created short link $i/$num_links"
-            fi
-        else
-            echo "Failed to create short link $i"
-        fi
-    done
-
-    echo "Accessing each link $num_requests times concurrently..."
-    > times.txt  # Ensure times.txt is created and empty
-
-    total_accesses=$((num_links * num_requests))
-    accesses_done=0
-
-    for refer in "${refer_links[@]}"; do
-        for ((i=1; i<=num_requests; i++)); do
-            # Wait for a slot
-            read -u 3
-            {
-                start_time=$(date +%s%6N)
-                curl -s "$refer" >> /dev/null
-                end_time=$(date +%s%6N)
-                elapsed_time=$(echo "$end_time - $start_time" | bc)
-                echo $elapsed_time >> times.txt
-                # Release the slot
-                echo >&3
-
-                ((accesses_done++))
-                if (( accesses_done % 10 == 0 )); then
-                    echo "Accessed $accesses_done/$total_accesses"
-                fi
-            } &
-        done
-    done
-
-    wait
-
-    # Stop resource usage logging
-    if kill -0 $resource_usage_pid 2>/dev/null; then
-        kill $resource_usage_pid
-    fi
-
-    # Read all elapsed times and calculate total
-    while read -r time; do
-        total_time=$(echo "$total_time + $time" | bc)
-    done < times.txt
-    rm times.txt
-
-    echo "****Results****"
-
-    calculate_average_usage
-    echo "Average Response Time: $(echo "scale=2; $total_time / ($num_links * $num_requests)" | bc) µs"
+cleanup() {
+    rm -f resource_usage.csv
+    docker compose down
 }
 
-echo "Setup..."
+main() {
+    check_dependencies
+    setup_containers
 
-docker-compose up -d
-# Ensure migrations are done
-docker-compose exec -T app migrate
+    monitor_resource_usage &  # Start monitoring in the background
+    monitor_pid=$!
+    trap 'kill $monitor_pid; cleanup; exit' INT
 
-# Create a new user and capture the API key
-output=$(docker-compose exec -T app cli --create-user=Admin)
-api_key=$(echo "$output" | awk -F' ' '/X-Api-Key:/{print $NF}')
-echo "Captured API Key: $api_key"
+    create_links
+    run_benchmark
 
-echo "Waiting for database to be ready..."
-sleep 5
+    kill $monitor_pid
+    analyze_resource_usage
+    cleanup
+}
 
-measure
-
-# Clean up
-docker-compose down
+main

bit.cr

@@ -5,14 +5,13 @@ require "./app/lib/*"
 require "./app/models/*"
 require "./app/serializers/*"
 require "./app/middlewares/*"
+require "./app/services/*"
 
 require "./app/routes"
 
 add_context_storage_type(App::Models::User)
 add_handler(App::Middlewares::Auth.new)
 
-error 500 { |env| {"error" => "Internal Server Error" }.to_json}
-error 401 { |env| {"error" => "Unauthorized" }.to_json}
-error 404 { |env| {"error" => "Not Found" }.to_json}
+App::Services::Cli.setup_admin_user
 
 Kemal.run

db/migrations/20240512214223_create_links.sql

@@ -5,7 +5,6 @@ CREATE TABLE links (
 	user_id TEXT NOT NULL,
 	slug VARCHAR(4) UNIQUE NOT NULL,
 	url TEXT NOT NULL,
-	click_counter INTEGER NOT NULL DEFAULT 0,
 	created_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
 	updated_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
 

db/migrations/20240711224103_create_clicks.sql

@@ -0,0 +1,19 @@
+-- +micrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+CREATE TABLE clicks (
+	id TEXT PRIMARY KEY NOT NULL,
+	link_id TEXT NOT NULL,
+	user_agent TEXT,
+	language TEXT,
+	browser TEXT,
+	os TEXT,
+	source TEXT,
+	created_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
+	updated_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
+
+	FOREIGN KEY (link_id) REFERENCES links(id) ON DELETE CASCADE
+);
+
+-- +micrate Down
+-- SQL section 'Down' is executed when this migration is rolled back
+DROP TABLE clicks;

db/migrations/20240714215409_update_slug_size_links.sql

@@ -0,0 +1,49 @@
+-- +micrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+
+-- Step 1: Create a new table with the desired column type
+CREATE TABLE links_new (
+  id TEXT PRIMARY KEY NOT NULL,
+  user_id TEXT NOT NULL,
+  slug VARCHAR(8) UNIQUE NOT NULL,
+  url TEXT NOT NULL,
+  created_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
+  updated_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
+
+  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Step 2: Copy data from the old table to the new table
+INSERT INTO links_new (id, user_id, slug, url, created_at, updated_at)
+SELECT id, user_id, slug, url, created_at, updated_at FROM links;
+
+-- Step 3: Drop the old table
+DROP TABLE links;
+
+-- Step 4: Rename the new table to the old table's name
+ALTER TABLE links_new RENAME TO links;
+
+-- +micrate Down
+-- SQL section 'Down' is executed when this migration is rolled back
+
+-- Step 1: Create a new table with the original column type
+CREATE TABLE links_old (
+  id TEXT PRIMARY KEY NOT NULL,
+  user_id TEXT NOT NULL,
+  slug VARCHAR(4) UNIQUE NOT NULL,
+  url TEXT NOT NULL,
+  created_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
+  updated_at INTEGER DEFAULT CURRENT_TIMESTAMP NOT NULL,
+
+  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Step 2: Copy data from the current table to the old table
+INSERT INTO links_old (id, user_id, slug, url, created_at, updated_at)
+SELECT id, user_id, substr(slug, 1, 4), url, created_at, updated_at FROM links;
+
+-- Step 3: Drop the current table
+DROP TABLE links;
+
+-- Step 4: Rename the old table to the current table's name
+ALTER TABLE links_old RENAME TO links;

docker-compose.yml

@@ -1,9 +1,15 @@
 services:
   app:
+    container_name: bit
     build: .
     environment:
       ENV: production
-      DATABASE_URL: sqlite3://./sqlite/data.db?journal_mode=wal&synchronous=normal&foreign_keys=true
-      APP_URL: http://0.0.0.0:4001
+      ADMIN_NAME: 'Tester'
+      ADMIN_API_KEY: '0p+mDvbpZGLPGVCXnV+EDduR9Blkv27Dhq9XSzSbdQY='
     ports:
-      - 4001:4000
+      - 4000:4000
+    volumes:
+      - sqlite_data:/app/sqlite
+
+volumes:
+  sqlite_data:

docs/API.md

@@ -0,0 +1,152 @@
+# API Reference
+
+1. **Ping the API**
+
+   - Endpoint: `GET /api/ping`
+   - Payload: None
+   - Response Example
+     ```json
+     {
+       "message": "pong"
+     }
+     ```
+
+2. **Redirect by Slug**
+
+   - Endpoint: `GET /:slug`
+   - Headers: `X-Api-Key`
+   - Payload: None
+   - Response Example
+     ```json
+     {
+       "data": {
+         "id": "84f0c7a4-8c4e-4665-b676-cb9c5e40f1db",
+         "refer": "http://localhost:4000/3wP4BQ",
+         "origin": "https://monocuco.donado.co",
+         "clicks": [
+           {
+             "id": "730e2202-58f9-478c-a24c-f1c561df6716",
+             "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0",
+             "language": "en-US",
+             "browser": "Firefox",
+             "os": "Mac OS X",
+             "source": "Unknown",
+             "created_at": "2024-07-12T19:25:22Z"
+           }
+         ]
+       }
+     }
+     ```
+
+3. **List All Links**
+
+   - Endpoint: `GET /api/links`
+   - Headers: `X-Api-Key`
+   - Payload: None
+   - Response Example
+     ```json
+     {
+       "data": [
+         {
+           "id": "84f0c7a4-8c4e-4665-b676-cb9c5e40f1db",
+           "refer": "http://localhost:4000/3wP4BQ",
+           "origin": "https://monocuco.donado.co",
+           "clicks": [
+             {
+               "id": "730e2202-58f9-478c-a24c-f1c561df6716",
+               "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0",
+               "language": "en-US",
+               "browser": "Firefox",
+               "os": "Mac OS X",
+               "source": "Unknown",
+               "created_at": "2024-07-12T19:25:22Z"
+             }
+           ]
+         }
+       ]
+     }
+     ```
+
+4. **List link by ID**
+
+   - Endpoint: `GET /api/links/:id`
+   - Headers: `X-Api-Key`
+   - Payload: None
+   - Response Example
+     ```json
+     {
+       "data": {
+         "id": "84f0c7a4-8c4e-4665-b676-cb9c5e40f1db",
+         "refer": "http://localhost:4000/3wP4BQ",
+         "origin": "https://monocuco.donado.co",
+         "clicks": [
+           {
+             "id": "730e2202-58f9-478c-a24c-f1c561df6716",
+             "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0",
+             "language": "en-US",
+             "browser": "Firefox",
+             "os": "Mac OS X",
+             "source": "Unknown",
+             "created_at": "2024-07-12T19:25:22Z"
+           }
+         ]
+       }
+     }
+     ```
+
+5. **Create new link**
+
+   - Endpoint\*\*: `POST /api/links`
+   - Payload:
+     ```json
+     {
+       "url": "https://example.com"
+     }
+     ```
+   - Headers: `X-Api-Key`
+   - Response Example:
+     ```json
+     {
+       "data": {
+         "id": "84f0c7a4-8c4e-4665-b676-cb9c5e40f1db",
+         "refer": "http://localhost:4000/3wP4BQ",
+         "origin": "https://monocuco.donado.co/test",
+         "clicks": []
+       }
+     }
+     ```
+
+6. **Update an existing link by ID**
+
+   - Endpoint: `PUT /api/links/:id`
+   - Payload:
+     ```json
+     {
+       "url": "https://newexample.com"
+     }
+     ```
+   - Headers: `X-Api-Key`
+   - Response Example:
+     ```json
+     {
+       "data": {
+         "id": "84f0c7a4-8c4e-4665-b676-cb9c5e40f1db",
+         "refer": "http://localhost:4000/3wP4BQ",
+         "origin": "https://newexample.com",
+         "clicks": []
+       }
+     }
+     ```
+
+7. **Delete a link by ID**
+
+   - Endpoint: `DELETE /api/links/:id`
+   - Payload: None
+   - Headers: `X-Api-Key`
+   - Response Example:
+     ```json
+     {
+       "message": "Link deleted"
+     }
+     ```
+

docs/SETUP.md

@@ -0,0 +1,147 @@
+## CLI
+
+```
+Usage: ./cli [options]
+Options:
+  --create-user=NAME    Create a new user with the given name
+  --list-users          List all users
+  --delete-user=USER_ID Delete a user by ID
+```
+
+## Run It Anywhere
+
+### Docker Compose
+
+```bash
+docker-compose up
+
+# Optional: Generate an api key
+# docker-compose exec -it app cli --create-user=Admin
+```
+
+### Docker CLI
+
+```bash
+docker run \
+    --name bit \
+    -p 4000:4000 \
+    -e ENV="production" \
+    -e DATABASE_URL="sqlite3://./sqlite/data.db?journal_mode=wal&synchronous=normal&foreign_keys=true" \
+    -e APP_URL="http://localhost:4000" \
+    -e ADMIN_NAME="Admin" \
+    -e ADMIN_API_KEY=$(openssl rand -base64 32) \
+    sjdonado/bit
+
+# Optional: Generate an api key
+# docker exec -it bit cli --create-user=Admin
+```
+
+### Self-Hosted with Dokku
+
+```dockerfile
+FROM sjdonado/bit
+```
+
+```bash
+dokku apps:create bit
+
+dokku domains:set bit bit.donado.co
+dokku letsencrypt:enable bit
+
+dokku storage:ensure-directory bit-sqlite
+dokku storage:mount bit /var/lib/dokku/data/storage/bit-sqlite:/usr/src/app/sqlite/
+
+dokku config:set bit DATABASE_URL="sqlite3://./sqlite/data.db?journal_mode=wal&synchronous=normal&foreign_keys=true" APP_URL=https://bit.donado.co ADMIN_NAME=Admin ADMIN_API_KEY=$(openssl rand -base64 32)
+
+dokku ports:add bit http:80:4000
+dokku ports:add bit https:443:4000
+
+# Optional: Generate an api key
+# dokku run bit cli --create-user=Admin
+```
+
+## Local Development
+
+### Requirements
+- Crystal 1.12+
+- Shards package manager
+- SQLite3
+
+### Install Dependencies
+- linux
+```bash
+sudo apt-get update && sudo apt-get install -y crystal libssl-dev libsqlite3-dev
+```
+
+- macos
+```bash
+brew tap amberframework/micrate
+brew install micrate
+```
+
+### Install Shards and Run
+
+```bash
+shards run bit
+```
+
+- Generate the `X-Api-Key`
+
+```bash
+shards run cli -- --create-user=Admin
+```
+
+- Run tests
+
+```bash
+ENV=test crystal spec
+```
+
+## Benchmark
+
+Conducted on a MacBook Air M2 with 16GB RAM.
+
+```
+$ ./benchmark.sh
+Setting up...
+[+] Running 3/3
+ ✔ Network bit_default       Created                                                                         0.0s
+ ✔ Volume "bit_sqlite_data"  Created                                                                         0.0s
+ ✔ Container bit             Started                                                                         0.1s
+Captured API Key: aHOCnZSuo2kOHy2mDa-iOA
+Waiting for the application to be ready...
+HTTP/1.1 200 OK
+Connection: keep-alive
+Content-Type: application/json
+Date: Sun, 27 Oct 2024 11:52:33 GMT
+Access-Control-Allow-Origin: *
+Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
+Access-Control-Allow-Headers: Content-Type, Accept, Origin, X-Api-Key
+Content-Length: 13
+
+Starting resource usage monitoring...
+Creating 10000 short links with 100 conrurrent requests...
+Link creation complete: 10000 links created.
+Fetching all created links from /api/links...
+Selected link for benchmarking: http://localhost:4000/UaVZjA
+Starting benchmark with Bombardier...
+Bombarding http://localhost:4000/oEKLAg with 10000 request(s) using 100 connection(s)
+ 10000 / 10000 [===============================================================================] 100.00% 830/s 12s
+Done!
+Statistics        Avg      Stdev        Max
+  Reqs/sec       853.89    1625.49    8942.54
+  Latency      118.48ms    11.52ms   142.58ms
+  HTTP codes:
+    1xx - 0, 2xx - 0, 3xx - 10000, 4xx - 0, 5xx - 0
+    others - 0
+  Throughput:   360.02KB/s
+Benchmark completed.
+Analyzing resource usage...
+**** Results ****
+Average CPU Usage: 40.68%
+Average Memory Usage: 28.62 MiB
+./benchmark.sh: line 135: 61567 Terminated: 15          monitor_resource_usage
+[+] Running 2/2
+ ✔ Container bit        Removed                                                                                                                                                                                               10.1s
+ ✔ Network bit_default  Removed  
+```

download_regexes.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+REGEXES_URL="https://raw.githubusercontent.com/ua-parser/uap-core/master/regexes.yaml"
+DOWNLOAD_DIR="data"
+REGEXES_FILE="regexes.yaml"
+
+mkdir -p $DOWNLOAD_DIR
+
+curl -L -o $DOWNLOAD_DIR/$REGEXES_FILE $REGEXES_URL
+
+echo "Regexes file downloaded to $DOWNLOAD_DIR/$REGEXES_FILE"

scripts/migrate.cr

@@ -1,7 +0,0 @@
-require "sqlite3"
-require"micrate"
-
-require "../app/config/env"
-
-Micrate::DB.connection_url = ENV["DATABASE_URL"]
-Micrate::Cli.run_up

shard.lock

@@ -48,3 +48,7 @@ shards:
     git: https://github.com/crystal-lang/crystal-sqlite3.git
     version: 0.19.0
 
+  user_agent_parser:
+    git: https://github.com/busyloop/user_agent_parser.git
+    version: 2.0.1
+

shard.yml

@@ -1,16 +1,14 @@
-name: url-shortener
-version: 0.1.0
+name: bit
+version: 1.4.1
 
 authors:
   - Juan Rodriguez <sjdonado@icloud.com>
 
 targets:
-  url-shortener:
-    main: url-shortener.cr
+  bit:
+    main: bit.cr
   cli:
     main: scripts/cli.cr
-  migrate:
-    main: scripts/migrate.cr
 
 dependencies:
   kemal:
@@ -22,6 +20,9 @@ dependencies:
   micrate:
     github: amberframework/micrate
     version: 0.15.1
+  user_agent_parser:
+    github: busyloop/user_agent_parser
+    version: 2.0.1
 
 development_dependencies:
   dotenv:
@@ -29,6 +30,6 @@ development_dependencies:
   spec-kemal:
     github: kemalcr/spec-kemal
 
-crystal: '>= 1.12.1'
+crystal: ">= 1.12.1"
 
 license: MIT

spec/integration/link_spec.cr

@@ -15,10 +15,34 @@ describe "App::Controllers::Link" do
         body: payload.to_json
       )
 
-      parsed_response = Hash(String, Hash(String, String | Int64)).from_json(response.body)
+      parsed_response = Hash(String, Hash(String, String | Int64 | Array(Hash(String, String)))).from_json(response.body)
       parsed_response["data"]["origin"].should eq(payload["url"])
     end
 
+    it "should return existing link if url already exists" do
+      test_user = create_test_user()
+
+      payload = {"url" => "http://idonthavespotify.donado.co"}
+      post(
+        "/api/links",
+        headers: HTTP::Headers{"Content-Type" => "application/json", "X-Api-Key" => test_user.api_key.to_s},
+        body: payload.to_json
+      )
+
+      first_response = Hash(String, Hash(String, String | Int64 | Array(Hash(String, String)))).from_json(response.body)
+      first_response["data"]["origin"].should eq(payload["url"])
+
+      post(
+        "/api/links",
+        headers: HTTP::Headers{"Content-Type" => "application/json", "X-Api-Key" => test_user.api_key.to_s},
+        body: payload.to_json
+      )
+
+      second_response = Hash(String, Hash(String, String | Int64 | Array(Hash(String, String)))).from_json(response.body)
+      second_response["data"]["origin"].should eq(payload["url"])
+      second_response["data"]["id"].should eq(first_response["data"]["id"])
+    end
+
     it "should return 400 - url required field" do
       test_user = create_test_user()
 
@@ -51,7 +75,7 @@ describe "App::Controllers::Link" do
       payload = {"url" => "https://kagi.com"}
       post("/api/links", headers: HTTP::Headers{"Content-Type" => "application/json"}, body: payload.to_json)
 
-      expected = {"error" => "Unauthorized"}.to_json
+      expected = {"error" => "Unauthorized access"}.to_json
       response.status_code.should eq(401)
       response.body.should eq(expected)
     end
@@ -59,7 +83,7 @@ describe "App::Controllers::Link" do
 
   describe "Index" do
     it "should redirect to origin domain" do
-      link = "https://kagi.com"
+      link = "https://test.com"
       test_user = create_test_user()
 
       test_link = create_test_link(test_user, link)
@@ -70,34 +94,29 @@ describe "App::Controllers::Link" do
       response.headers["Location"].should eq(link)
     end
 
-    it "should increase click counter after redirect" do
-      link = "https://kagi.com"
+    it "should create a new click after redirect" do
+      link = "https://sjdonado.com"
       test_user = create_test_user()
 
       test_link = create_test_link(test_user, link)
       serialized_link = App::Serializers::Link.new(test_link)
 
-      get(serialized_link.refer, headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
-      Fiber.yield
+      get(serialized_link.refer, headers: HTTP::Headers{"User-Agent" => "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0"})
+
+      Fiber.yield # replace yield with sleep 5 to debug errors
 
       response.headers["Location"].should eq(link)
 
       updated_test_link = get_test_link(test_link.id)
-      updated_test_link.click_counter.should eq(1)
+      updated_test_link.clicks.size.should eq(test_link.clicks.size + 1)
     end
 
     it "should return 404 - link does not exist" do
-      link = "https://kagi.com"
       test_user = create_test_user()
 
-      test_link = create_test_link(test_user, link)
-      serialized_link = App::Serializers::Link.new(test_link)
+      get("https://localhost:4001/R4kj2")
 
-      delete_test_link(test_link.id)
-
-      get(serialized_link.refer, headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
-
-      expected = {"error" => "Not Found"}.to_json
+      expected = {"error" => "Resource not found"}.to_json
       response.status_code.should eq(404)
       response.body.should eq(expected)
     end
@@ -114,14 +133,14 @@ describe "App::Controllers::Link" do
 
       get("/api/links", headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
 
-      parsed_response = Hash(String, Array(Hash(String, String | Int64))).from_json(response.body)
+      parsed_response = Hash(String, Array(Hash(String, String | Int64 | Array(Hash(String, String))))).from_json(response.body)
       parsed_response["data"][0]["origin"].should eq(links[0])
       parsed_response["data"][1]["origin"].should eq(links[1])
       parsed_response["data"][2]["origin"].should eq(links[2])
     end
 
     it "should return owned links only" do
-      links = ["https://google.com", "google.com", "google.com.co", "kagi.com"]
+      links = ["https://google.de", "google.de", "google.edu.co", "x.com"]
       test_user = create_test_user()
 
       links[0..2].each do |link|
@@ -133,7 +152,7 @@ describe "App::Controllers::Link" do
 
       get("/api/links", headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
 
-      parsed_response = Hash(String, Array(Hash(String, String | Int64))).from_json(response.body)
+      parsed_response = Hash(String, Array(Hash(String, String | Int64 | Array(Hash(String, String))))).from_json(response.body)
       parsed_response["data"].size.should eq(3)
       parsed_response["data"][0]["origin"].should eq(links[0])
       parsed_response["data"][1]["origin"].should eq(links[1])
@@ -143,7 +162,39 @@ describe "App::Controllers::Link" do
     it "should return 401 - missing api key" do
       get "/api/links"
 
-      expected = {"error" => "Unauthorized"}.to_json
+      expected = {"error" => "Unauthorized access"}.to_json
+      response.status_code.should eq(401)
+      response.body.should eq(expected)
+    end
+  end
+
+  describe "Get" do
+    it "should return the specified link with click details" do
+      link = "https://bing.com"
+      test_user = create_test_user()
+      test_link = create_test_link(test_user, link)
+
+      get("/api/links/#{test_link.id}", headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
+
+      parsed_response = Hash(String, Hash(String, String | Int64 | Array(Hash(String, String)))).from_json(response.body)
+      parsed_response["data"]["origin"].should eq(link)
+      parsed_response["data"]["clicks"].should be_a(Array(Hash(String, String)))
+    end
+
+    it "should return 404 - link does not exist" do
+      test_user = create_test_user()
+
+      get("/api/links/1", headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
+
+      expected = {"error" => "Resource not found"}.to_json
+      response.status_code.should eq(404)
+      response.body.should eq(expected)
+    end
+
+    it "should return 401 - missing api key" do
+      get "/api/links/1"
+
+      expected = {"error" => "Unauthorized access"}.to_json
       response.status_code.should eq(401)
       response.body.should eq(expected)
     end
@@ -151,18 +202,18 @@ describe "App::Controllers::Link" do
 
   describe "Update" do
     it "should update link url" do
-      link = "https://kagi.com"
+      link = "https://github.com"
       test_user = create_test_user()
       test_link = create_test_link(test_user, link)
 
-      payload = {"url" => "https://kagi.com.co"}
+      payload = {"url" => "https://github.com.co"}
       put(
         "/api/links/#{test_link.id}",
         headers: HTTP::Headers{"Content-Type" => "application/json", "X-Api-Key" => test_user.api_key.to_s},
         body: payload.to_json
       )
 
-      parsed_response = Hash(String, Hash(String, String | Int64)).from_json(response.body)
+      parsed_response = Hash(String, Hash(String, String | Int64 | Array(Hash(String, String)))).from_json(response.body)
       parsed_response["data"]["origin"].should eq(payload["url"])
     end
 
@@ -176,7 +227,7 @@ describe "App::Controllers::Link" do
         body: payload.to_json
       )
 
-      expected = {"error" => "Not Found"}.to_json
+      expected = {"error" => "Resource not found"}.to_json
       response.status_code.should eq(404)
       response.body.should eq(expected)
     end
@@ -189,7 +240,7 @@ describe "App::Controllers::Link" do
         body: payload.to_json
       )
 
-      expected = {"error" => "Unauthorized"}.to_json
+      expected = {"error" => "Unauthorized access"}.to_json
       response.status_code.should eq(401)
       response.body.should eq(expected)
     end
@@ -197,7 +248,7 @@ describe "App::Controllers::Link" do
 
   describe "Delete" do
     it "should delete link url" do
-      link = "https://kagi.com"
+      link = "https://news.ycombinator.com"
       test_user = create_test_user()
       test_link = create_test_link(test_user, link)
 
@@ -211,7 +262,7 @@ describe "App::Controllers::Link" do
 
       delete("/api/links/1", headers: HTTP::Headers{"X-Api-Key" => test_user.api_key.to_s})
 
-      expected = {"error" => "Not Found"}.to_json
+      expected = {"error" => "Resource not found"}.to_json
       response.status_code.should eq(404)
       response.body.should eq(expected)
     end
@@ -219,7 +270,7 @@ describe "App::Controllers::Link" do
     it "should return 401 - missing api key" do
       delete "/api/links/1"
 
-      expected = {"error" => "Unauthorized"}.to_json
+      expected = {"error" => "Unauthorized access"}.to_json
       response.status_code.should eq(401)
       response.body.should eq(expected)
     end

spec/services/cli_spec.cr

@@ -34,4 +34,29 @@ describe "App::Services::Cli" do
 
     output.should contain "Failed to delete user"
   end
+
+  it "sets up an admin user if environment variables are present" do
+    ENV["ADMIN_NAME"] = "adminuser"
+    ENV["ADMIN_API_KEY"] = "secure_admin_key"
+
+    App::Services::Cli.setup_admin_user
+
+    admin_user = App::Lib::Database.all(App::Models::User).find { |u| u.name == "adminuser" }
+    admin_user.should_not be_nil
+    admin_user = admin_user.not_nil!
+
+    admin_user.api_key.should eq "secure_admin_key"
+
+    App::Services::Cli.delete_user(admin_user.id)
+  end
+
+  it "skips admin setup if environment variables are missing" do
+    ENV.delete("ADMIN_NAME")
+    ENV.delete("ADMIN_API_KEY")
+
+    App::Services::Cli.setup_admin_user
+
+    users = App::Lib::Database.all(App::Models::User)
+    users.none? { |u| u.name == "adminuser" }.should be_true
+  end
 end

spec/spec_helper.cr

@@ -1,11 +1,21 @@
 require "uuid"
+require "file_utils"
 
 require "spec-kemal"
 require "micrate"
 
-require "../url-shortener"
+require "dotenv"
+Dotenv.load ".env.#{ENV["ENV"]}"
+
+require "../bit"
 
 Spec.before_suite do
+  # Delete the SQLite database file if it exists
+  db_file_path = ENV["DATABASE_URL"].split("sqlite3://").last.split("?").first
+  if File.exists?(db_file_path)
+    File.delete(db_file_path)
+  end
+
   Micrate::DB.connection_url = ENV["DATABASE_URL"]
   Micrate::Cli.run_up
 
@@ -20,7 +30,8 @@ def create_test_user
 
   changeset = App::Lib::Database.insert(user)
   if !changeset.valid?
-    raise "Test user creation failed"
+    error_messages = changeset.errors.map { |error| "#{error}" }.join(", ")
+    raise "Test user creation failed #{error_messages}"
   end
 
   user
@@ -29,20 +40,28 @@ end
 def create_test_link(user, url)
   link = App::Models::Link.new
   link.id = UUID.v4.to_s
+  link.slug = App::Services::SlugService.shorten_url(url, user.id.to_s)
   link.url = url
-  link.slug = Random::Secure.urlsafe_base64(4)
   link.user = user
 
   changeset = App::Lib::Database.insert(link)
-  if !changeset.valid?
-    raise "Test link creation failed"
+  unless changeset.valid?
+    error_messages = changeset.errors.map { |error| "#{error}" }.join(", ")
+    raise "Test link creation failed: #{error_messages}"
   end
 
+  link.clicks = [] of App::Models::Click
+
   link
 end
 
 def get_test_link(link_id)
-  App::Lib::Database.get!(App::Models::Link, link_id)
+  query = App::Lib::Database::Query.where(id: link_id.as(String)).limit(1)
+  link = App::Lib::Database.all(App::Models::Link, query, preload: [:clicks]).first?
+
+  raise "Link not found" if link.nil?
+
+  link
 end
 
 def delete_test_link(link_id)