Gin logging (#165)

* start messing around with logger

* more messing about

* fix error with instance not created on startup (#156)

* set logger

* log user agent

* finalize logging

* go fmt

* start messing around with logger

* more messing about

* set logger

* log user agent

* finalize logging

* go fmt

internal/router/logger.go

@@ -0,0 +1,73 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package router
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+var skipPaths = map[string]interface{}{
+	"/api/v1/streaming": nil,
+}
+
+func loggerWithConfig(log *logrus.Logger) gin.HandlerFunc {
+	logHandler := func(c *gin.Context) {
+		start := time.Now()
+		path := c.Request.URL.Path
+		raw := c.Request.URL.RawQuery
+
+		// Process request
+		c.Next()
+
+		// Log only when path is not being skipped
+		if _, ok := skipPaths[path]; !ok {
+			latency := time.Since(start)
+			clientIP := c.ClientIP()
+			userAgent := c.Request.UserAgent()
+			method := c.Request.Method
+			statusCode := c.Writer.Status()
+			errorMessage := c.Errors.ByType(gin.ErrorTypePrivate).String()
+			bodySize := c.Writer.Size()
+			if raw != "" {
+				path = path + "?" + raw
+			}
+
+			l := log.WithFields(logrus.Fields{
+				"latency":    latency,
+				"clientIP":   clientIP,
+				"userAgent":  userAgent,
+				"method":     method,
+				"statusCode": statusCode,
+				"path":       path,
+			})
+
+			if errorMessage == "" {
+				l.Infof("%s: wrote %d bytes in %v", http.StatusText(statusCode), bodySize, latency)
+			} else {
+				l.Errorf("%s: %s", http.StatusText(statusCode), errorMessage)
+			}
+		}
+	}
+
+	return logHandler
+}