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middleware.go
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middleware.go
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package web
import (
"fmt"
"net/http"
"time"
"github.com/go-chi/chi/middleware"
"github.com/src-d/lookout/util/ctxlog"
log "gopkg.in/src-d/go-log.v1"
)
// RequestLogger middleware logs all incoming requests and
// adds log fields to the request context
func RequestLogger(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
logFields := logFieldsFromRequest(r)
ctx, logger := ctxlog.WithLogFields(r.Context(), logFields)
logger.Infof("request started")
ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
t1 := time.Now()
defer func() {
t2 := time.Now()
logger.With(log.Fields{
"resp_status": ww.Status(), "resp_bytes_length": ww.BytesWritten(),
"resp_elapsed_ms": float64(t2.Sub(t1).Nanoseconds()) / 1000000.0,
}).Infof("request complete")
}()
r = r.WithContext(ctx)
next.ServeHTTP(ww, r)
}
return http.HandlerFunc(fn)
}
func logFieldsFromRequest(r *http.Request) log.Fields {
logFields := log.Fields{}
scheme := "http"
if r.TLS != nil {
scheme = "https"
}
host := r.Host
logFields["http_scheme"] = scheme
logFields["http_proto"] = r.Proto
logFields["http_method"] = r.Method
logFields["remote_addr"] = r.RemoteAddr
logFields["user_agent"] = r.UserAgent()
if val := r.Header.Get("X-Forwarded-For"); val != "" {
logFields["X-Forwarded-For"] = val
}
if val := r.Header.Get("X-Forwarded-Host"); val != "" {
logFields["X-Forwarded-Host"] = val
host = val
}
if val := r.Header.Get("X-Forwarded-Scheme"); val != "" {
logFields["X-Forwarded-Scheme"] = val
scheme = val
}
logFields["uri"] = fmt.Sprintf("%s://%s%s", scheme, host, r.RequestURI)
return logFields
}