refactor: rewrite app with chi and sqlc

.gitignore

@@ -1,8 +1,11 @@
 # data
-data/analytics.db
+data
 
 # debug
 __debug_*
 
-# bench
+# build out
+tinyauth-analytics
+
+# benchmarks
 bench

.vscode/launch.json

@@ -8,7 +8,7 @@
       "mode": "auto",
       "program": "${fileDirname}",
       "env": {
-        "DB_PATH": "./data/analytics.db",
+        "DATABASE_PATH": "./data/analytics.db",
         "PORT": "8080",
         "ADDRESS": "0.0.0.0",
         "TRUSTED_PROXIES": "0.0.0.0",

Dockerfile

@@ -10,8 +10,12 @@ COPY go.sum ./
 
 RUN go mod download
 
+COPY ./cache.go ./
+COPY ./health_handler.go ./
+COPY ./instances_handler.go ./
 COPY ./main.go ./
-COPY ./internal ./internal
+COPY ./rate_limiter.go ./
+COPY ./database ./database
 
 RUN CGO_ENABLED=0 go build -ldflags "-s -w -X main.version=${VERSION}" 
 

README.md

@@ -4,7 +4,7 @@ A simple server to transparently collect version information from Tinyauth insta
 
 ## How does it work
 
-Every Tinyauth instance runs a goroutine (unless you choose to opt-out) that does a "heartbeat" every 12 hours indicating the instance is still alive. The heartbeat contains the UUID generated by Tinyauth on start up and the version information. The server stores them in the SQLite database alongside with the last seen date. When you request all the instances, the server responds with an array containing the versions, UUIDs and last seen dates. In order to increase transparency, if the `LOG_LEVEL` is configured to `debug` or `trace`, the server will return a warning both in the instances and heartbeat endpoint in order to inform the user that sensitive information like IP addresses may be logged.
+Every Tinyauth instance runs a goroutine (unless you choose to opt-out) that does a "heartbeat" every 12 hours indicating the instance is still alive. The heartbeat contains the UUID generated by Tinyauth on start up and the version information. The server stores them in the SQLite database alongside with the last seen date. When you request all the instances, the server responds with an array containing the versions, UUIDs and last seen dates.
 
 ## Running
 
@@ -18,15 +18,14 @@ docker compose up -d
 
 The server is configured using environment variables, the following options are supported:
 
-| Name                   | Type         | Description                                                | Default              |
-| ---------------------- | ------------ | ---------------------------------------------------------- | -------------------- |
-| `DB_PATH`              | string       | Path to the SQLite database file.                          | `/data/analytics.db` |
-| `PORT`                 | number       | The port to run the server on.                             | `8080`               |
-| `ADDRESS`              | string       | The address to bind the server to.                         | `0.0.0.0`            |
-| `RATE_LIMIT_COUNT`     | number       | Maximum number of requests per minute per IP.              | `3`                  |
-| `CORS_ALLOWED_ORIGINS` | string/array | Comma-separated list of allowed CORS origins.              | `*`                  |
-| `TRUSTED_PROXIES`      | string/array | Comma-separated list of trusted proxy IPs.                 | `""` (empty)         |
-| `LOG_LEVEL`            | string       | Log level (trace, debug, info, warn, error, fatal, panic). | `info`               |
+| Name                   | Type         | Description                                   | Default              |
+| ---------------------- | ------------ | --------------------------------------------- | -------------------- |
+| `DATABASE_PATH`        | string       | Path to the SQLite database file.             | `/data/analytics.db` |
+| `PORT`                 | number       | The port to run the server on.                | `8080`               |
+| `ADDRESS`              | string       | The address to bind the server to.            | `0.0.0.0`            |
+| `RATE_LIMIT_COUNT`     | number       | Maximum number of requests per minute per IP. | `3`                  |
+| `CORS_ALLOWED_ORIGINS` | string/array | Comma-separated list of allowed CORS origins. | `*`                  |
+| `TRUSTED_PROXIES`      | string/array | Comma-separated list of trusted proxy IPs.    | ``                   |
 
 ## Contributing
 

cache.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"sync"
+	"time"
+)
+
+type cacheField struct {
+	value  any
+	expire int64
+}
+
+type Cache struct {
+	cache map[string]cacheField
+	mutex sync.RWMutex
+}
+
+func NewCache() *Cache {
+	cache := &Cache{
+		cache: make(map[string]cacheField),
+	}
+	cache.cleanup()
+	return cache
+}
+
+func (c *Cache) Set(key string, value any, ttl int64) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	expire := time.Now().Add(time.Duration(ttl) * time.Second).Unix()
+
+	c.cache[key] = cacheField{
+		value:  value,
+		expire: expire,
+	}
+}
+
+func (c *Cache) Get(key string) (any, bool) {
+	c.mutex.RLock()
+
+	field, ok := c.cache[key]
+
+	if !ok {
+		c.mutex.RUnlock()
+		return nil, false
+	}
+
+	if time.Now().Unix() > field.expire {
+		c.mutex.RUnlock()
+		c.Delete(key)
+		return nil, false
+	}
+
+	c.mutex.RUnlock()
+	return field.value, true
+}
+
+func (c *Cache) Delete(key string) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	delete(c.cache, key)
+}
+
+func (c *Cache) Flush() {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	c.cache = make(map[string]cacheField, 0)
+}
+
+func (c *Cache) cleanup() {
+	go func() {
+		ticker := time.NewTicker(24 * time.Hour)
+		defer ticker.Stop()
+
+		for range ticker.C {
+			c.mutex.Lock()
+			for key, field := range c.cache {
+				if time.Now().Unix() > field.expire {
+					delete(c.cache, key)
+				}
+			}
+			c.mutex.Unlock()
+		}
+	}()
+}

docker-compose.dev.yml

@@ -12,27 +12,26 @@ services:
       - RATE_LIMIT_COUNT=15
       - CORS_ALLOWED_ORIGINS=*
       - TRUSTED_PROXIES=0.0.0.0
-      - LOG_LEVEL=debug
     volumes:
       - ./data:/data
     ports:
       - 8080:8080
     restart: unless-stopped
 
-  analytics-dashboard:
-    build:
-      context: ./dashboard
-      dockerfile: Dockerfile
-      args:
-        - VERSION=development
-    environment:
-      - PORT=8090
-      - ADDRESS=0.0.0.0
-      - API_SERVER=http://tinyauth-analytics:8080
-      - PAGE_SIZE=10
-      - REFRESH_INTERVAL=1
-    ports:
-      - 8090:8090
-    restart: unless-stopped
-    depends_on:
-      - tinyauth-analytics
+  # analytics-dashboard:
+  #   build:
+  #     context: ./dashboard
+  #     dockerfile: Dockerfile
+  #     args:
+  #       - VERSION=development
+  #   environment:
+  #     - PORT=8090
+  #     - ADDRESS=0.0.0.0
+  #     - API_SERVER=http://tinyauth-analytics:8080
+  #     - PAGE_SIZE=10
+  #     - REFRESH_INTERVAL=1
+  #   ports:
+  #     - 8090:8090
+  #   restart: unless-stopped
+  #   depends_on:
+  #     - tinyauth-analytics