Refactor Router Logger (#17308)

Make router logger more friendly, show the related function name/file/line.

[BREAKING]
This PR substantially changes the logging format of the router logger. If you use this logging for monitoring e.g. fail2ban you will need to update this to match the new format.

modules/web/routing/context.go

@@ -0,0 +1,51 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package routing
+
+import (
+	"context"
+	"net/http"
+)
+
+type contextKeyType struct{}
+
+var contextKey contextKeyType
+
+//UpdateFuncInfo updates a context's func info
+func UpdateFuncInfo(ctx context.Context, funcInfo *FuncInfo) {
+	record, ok := ctx.Value(contextKey).(*requestRecord)
+	if !ok {
+		return
+	}
+
+	record.lock.Lock()
+	record.funcInfo = funcInfo
+	record.lock.Unlock()
+
+}
+
+// MarkLongPolling marks the reuqest is a long-polling request, and the logger may output different message for it
+func MarkLongPolling(resp http.ResponseWriter, req *http.Request) {
+	record, ok := req.Context().Value(contextKey).(*requestRecord)
+	if !ok {
+		return
+	}
+
+	record.lock.Lock()
+	record.isLongPolling = true
+	record.lock.Unlock()
+}
+
+//UpdatePanicError updates a context's error info, a panic may be recovered by other middlewares, but we still need to know that.
+func UpdatePanicError(ctx context.Context, err interface{}) {
+	record, ok := ctx.Value(contextKey).(*requestRecord)
+	if !ok {
+		return
+	}
+
+	record.lock.Lock()
+	record.panicError = err
+	record.lock.Unlock()
+}