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middlewares.go
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middlewares.go
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package main
import (
"fmt"
"log"
"net/http"
"runtime/debug"
"sync/atomic"
"time"
rotatelogs "github.com/lestrrat-go/file-rotatelogs"
limiter "github.com/ulule/limiter/v3"
stdlib "github.com/ulule/limiter/v3/drivers/middleware/stdlib"
memory "github.com/ulule/limiter/v3/drivers/store/memory"
)
// limiter middleware pointer
var limiterMiddleware *stdlib.Middleware
// initialize Limiter middleware pointer
func initLimiter(period string) {
log.Printf("limiter rate='%s'", period)
// create rate limiter with 5 req/second
rate, err := limiter.NewRateFromFormatted(period)
if err != nil {
panic(err)
}
store := memory.NewStore()
instance := limiter.New(store, rate)
limiterMiddleware = stdlib.NewMiddleware(instance)
}
// limit middleware limits incoming requests
func limitMiddleware(next http.Handler) http.Handler {
return limiterMiddleware.Handler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
next.ServeHTTP(w, r)
}))
}
// responseWriter is a minimal wrapper for http.ResponseWriter that allows the
// written HTTP status code to be captured for logging.
type responseWriter struct {
http.ResponseWriter
status int
wroteHeader bool
}
func wrapResponseWriter(w http.ResponseWriter) *responseWriter {
return &responseWriter{ResponseWriter: w}
}
func (rw *responseWriter) Status() int {
return rw.status
}
func (rw *responseWriter) WriteHeader(code int) {
if rw.wroteHeader {
return
}
rw.status = code
rw.ResponseWriter.WriteHeader(code)
rw.wroteHeader = true
return
}
// LoggingMiddleware logs the incoming HTTP request & its duration.
// https://blog.questionable.services/article/guide-logging-middleware-go/
func loggingMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Printf("error %v\nstack %v\n", err, string(debug.Stack()))
}
}()
if r.Method == "POST" {
atomic.AddUint64(&TotalPostRequests, 1)
} else if r.Method == "GET" {
atomic.AddUint64(&TotalGetRequests, 1)
}
start := time.Now()
wrapped := wrapResponseWriter(w)
next.ServeHTTP(wrapped, r)
status := wrapped.status
if status == 0 {
status = 200
}
log.Printf("%v %s %s %v", status, r.Method, r.URL.EscapedPath(), time.Since(start))
})
}
// custom rotate logger
type rotateLogWriter struct {
RotateLogs *rotatelogs.RotateLogs
}
// rotate logger Write method
func (w rotateLogWriter) Write(data []byte) (int, error) {
return w.RotateLogs.Write([]byte(utcMsg(data)))
}
// custom logger
type logWriter struct {
}
// custom logger Write method
func (writer logWriter) Write(data []byte) (int, error) {
return fmt.Print(utcMsg(data))
}
// helper function to return UTC string for given data
func utcMsg(data []byte) string {
var msg string
if Config.UTC {
msg = fmt.Sprintf("[" + time.Now().UTC().String() + "] " + string(data))
} else {
msg = fmt.Sprintf("[" + time.Now().String() + "] " + string(data))
}
return msg
}