TUN-8238: Refactor proxy logging

Propagates the logger context into further locations to help provide more context for certain errors. For instance, upstream and downstream copying errors will properly have the assigned flow id attached and destination address.

proxy/logger.go

@@ -0,0 +1,78 @@
+package proxy
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/rs/zerolog"
+
+	"github.com/cloudflare/cloudflared/connection"
+	"github.com/cloudflare/cloudflared/ingress"
+	"github.com/cloudflare/cloudflared/management"
+)
+
+const (
+	logFieldCFRay         = "cfRay"
+	logFieldLBProbe       = "lbProbe"
+	logFieldRule          = "ingressRule"
+	logFieldOriginService = "originService"
+	logFieldFlowID        = "flowID"
+	logFieldConnIndex     = "connIndex"
+	logFieldDestAddr      = "destAddr"
+)
+
+// newHTTPLogger creates a child zerolog.Logger from the provided with added context from the HTTP request, ingress
+// services, and connection index.
+func newHTTPLogger(logger *zerolog.Logger, connIndex uint8, req *http.Request, rule int, serviceName string) zerolog.Logger {
+	ctx := logger.With().
+		Int(management.EventTypeKey, int(management.HTTP)).
+		Uint8(logFieldConnIndex, connIndex)
+	cfRay := connection.FindCfRayHeader(req)
+	lbProbe := connection.IsLBProbeRequest(req)
+	if cfRay != "" {
+		ctx.Str(logFieldCFRay, cfRay)
+	}
+	if lbProbe {
+		ctx.Bool(logFieldLBProbe, lbProbe)
+	}
+	return ctx.
+		Str(logFieldOriginService, serviceName).
+		Interface(logFieldRule, rule).
+		Logger()
+}
+
+// newTCPLogger creates a child zerolog.Logger from the provided with added context from the TCPRequest.
+func newTCPLogger(logger *zerolog.Logger, req *connection.TCPRequest) zerolog.Logger {
+	return logger.With().
+		Int(management.EventTypeKey, int(management.TCP)).
+		Uint8(logFieldConnIndex, req.ConnIndex).
+		Str(logFieldOriginService, ingress.ServiceWarpRouting).
+		Str(logFieldFlowID, req.FlowID).
+		Str(logFieldDestAddr, req.Dest).
+		Uint8(logFieldConnIndex, req.ConnIndex).
+		Logger()
+}
+
+// logHTTPRequest logs a Debug message with the corresponding HTTP request details from the eyeball.
+func logHTTPRequest(logger *zerolog.Logger, r *http.Request) {
+	logger.Debug().
+		Str("host", r.Host).
+		Str("path", r.URL.Path).
+		Interface("headers", r.Header).
+		Int64("content-length", r.ContentLength).
+		Msgf("%s %s %s", r.Method, r.URL, r.Proto)
+}
+
+// logOriginHTTPResponse logs a Debug message of the origin response.
+func logOriginHTTPResponse(logger *zerolog.Logger, resp *http.Response) {
+	responseByCode.WithLabelValues(strconv.Itoa(resp.StatusCode)).Inc()
+	logger.Debug().
+		Int64("content-length", resp.ContentLength).
+		Msgf("%s", resp.Status)
+}
+
+// logRequestError logs an error for the proxied request.
+func logRequestError(logger *zerolog.Logger, err error) {
+	requestErrors.Inc()
+	logger.Error().Err(err).Send()
+}