/
logger.go
163 lines (133 loc) · 3.8 KB
/
logger.go
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package httpclient
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"time"
"github.com/benthosdev/benthos/v4/public/service"
"go.uber.org/multierr"
)
type roundTripper struct {
base http.RoundTripper
logger *service.Logger
level string
}
var _ http.RoundTripper = (*roundTripper)(nil)
func newRequestLog(base http.RoundTripper, logger *service.Logger, lvl string) (http.RoundTripper, error) {
if base == nil {
base = http.DefaultTransport
}
if lvl == "" {
return base, nil
}
return &roundTripper{
base: base,
logger: logger,
level: strings.ToUpper(strings.TrimSpace(lvl)),
}, nil
}
func (r *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
t0 := time.Now()
var (
respOriginal *http.Response // final response
errCum error // final error
)
var (
reqBodyCaptured interface{}
reqBodyBuf = &bytes.Buffer{}
reqBodyErr error
)
if req != nil && req.Body != nil {
_, reqBodyErr = io.Copy(reqBodyBuf, req.Body)
if reqBodyErr != nil {
errCum = multierr.Append(errCum, fmt.Errorf("error copy request body: %w", reqBodyErr))
reqBodyBuf = &bytes.Buffer{}
}
if _err := req.Body.Close(); _err != nil {
errCum = multierr.Append(errCum, fmt.Errorf("error closing request body: %w", _err))
}
req.Body = io.NopCloser(reqBodyBuf)
}
// use json.Unmarshal instead of json.NewDecoder to make sure we can re-read the buffer
if _err := json.Unmarshal(reqBodyBuf.Bytes(), &reqBodyCaptured); _err != nil && reqBodyBuf.Len() > 0 {
reqBodyCaptured = reqBodyBuf.String()
}
var roundTripErr error
respOriginal, roundTripErr = r.base.RoundTrip(req)
if roundTripErr != nil {
errCum = multierr.Append(errCum, fmt.Errorf("error doing actual request: %w", roundTripErr))
}
var (
respBodyCaptured interface{}
respBodyBuf = &bytes.Buffer{}
respErrBody error
)
if respOriginal != nil && respOriginal.Body != nil {
_, respErrBody = io.Copy(respBodyBuf, respOriginal.Body)
if respErrBody != nil {
errCum = multierr.Append(errCum, fmt.Errorf("error copy response body: %w", respErrBody))
respBodyBuf = &bytes.Buffer{}
}
if _err := respOriginal.Body.Close(); _err != nil {
errCum = multierr.Append(errCum, fmt.Errorf("error closing response body: %w", _err))
}
respOriginal.Body = io.NopCloser(respBodyBuf)
}
// use json.Unmarshal instead of json.NewDecoder to make sure we can re-read the buffer
if _err := json.Unmarshal(respBodyBuf.Bytes(), &respBodyCaptured); _err != nil && respBodyBuf.Len() > 0 {
respBodyCaptured = respBodyBuf.String()
}
// log outgoing request as simple map
accessLog := map[string]any{
"elapsed_ns": time.Since(t0).Nanoseconds(),
}
// append to map only when the http.Request is not nil
if req != nil {
accessLog["request"] = map[string]any{
"url": req.URL.Redacted(),
"method": req.Method,
"header": toSimpleMap(req.Header),
"body": reqBodyCaptured,
}
}
// append to map only when the http.Response is not nil
if respOriginal != nil {
accessLog["response"] = map[string]any{
"status_code": respOriginal.StatusCode,
"content_length": respOriginal.ContentLength,
"header": toSimpleMap(respOriginal.Header),
"body": respBodyCaptured,
}
}
// append error if any
if errCum != nil {
accessLog["error"] = errCum.Error()
}
logger := r.logger.With("access_log", accessLog)
msg := "http request log"
switch r.level {
case "TRACE":
logger.Trace(msg)
case "DEBUG":
logger.Debug(msg)
case "INFO":
logger.Info(msg)
case "WARN":
logger.Warn(msg)
case "ERROR":
logger.Error(msg)
case "FATAL":
logger.Error(msg)
}
return respOriginal, roundTripErr
}
var toSimpleMap = func(h http.Header) map[string]string {
out := map[string]string{}
for k, v := range h {
out[k] = strings.Join(v, " ")
}
return out
}