move SFTPGo package to the internal folder

SFTPGo is a daemon and command line tool, not a library.

The public API are provided by the SDK

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/logger/request_logger.go

@@ -0,0 +1,106 @@
+// Copyright (C) 2019-2022  Nicola Murino
+//
+// 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, version 3.
+//
+// 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 <https://www.gnu.org/licenses/>.
+
+package logger
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/rs/zerolog"
+
+	"github.com/drakkan/sftpgo/v2/internal/metric"
+)
+
+// StructuredLogger defines a simple wrapper around zerolog logger.
+// It implements chi.middleware.LogFormatter interface
+type StructuredLogger struct {
+	Logger *zerolog.Logger
+}
+
+// StructuredLoggerEntry defines a log entry.
+// It implements chi.middleware.LogEntry interface
+type StructuredLoggerEntry struct {
+	// The zerolog logger
+	Logger *zerolog.Logger
+	// fields to write in the log
+	fields map[string]any
+}
+
+// NewStructuredLogger returns a chi.middleware.RequestLogger using our StructuredLogger.
+// This structured logger is called by the chi.middleware.Logger handler to log each HTTP request
+func NewStructuredLogger(logger *zerolog.Logger) func(next http.Handler) http.Handler {
+	return middleware.RequestLogger(&StructuredLogger{logger})
+}
+
+// NewLogEntry creates a new log entry for an HTTP request
+func (l *StructuredLogger) NewLogEntry(r *http.Request) middleware.LogEntry {
+	scheme := "http"
+	if r.TLS != nil {
+		scheme = "https"
+	}
+
+	fields := map[string]any{
+		"local_addr":  getLocalAddress(r),
+		"remote_addr": r.RemoteAddr,
+		"proto":       r.Proto,
+		"method":      r.Method,
+		"user_agent":  r.UserAgent(),
+		"uri":         fmt.Sprintf("%s://%s%s", scheme, r.Host, r.RequestURI)}
+
+	reqID := middleware.GetReqID(r.Context())
+	if reqID != "" {
+		fields["request_id"] = reqID
+	}
+
+	return &StructuredLoggerEntry{Logger: l.Logger, fields: fields}
+}
+
+// Write logs a new entry at the end of the HTTP request
+func (l *StructuredLoggerEntry) Write(status, bytes int, header http.Header, elapsed time.Duration, extra any) {
+	metric.HTTPRequestServed(status)
+	l.Logger.Info().
+		Timestamp().
+		Str("sender", "httpd").
+		Fields(l.fields).
+		Int("resp_status", status).
+		Int("resp_size", bytes).
+		Int64("elapsed_ms", elapsed.Nanoseconds()/1000000).
+		Send()
+}
+
+// Panic logs panics
+func (l *StructuredLoggerEntry) Panic(v any, stack []byte) {
+	l.Logger.Error().
+		Timestamp().
+		Str("sender", "httpd").
+		Fields(l.fields).
+		Str("stack", string(stack)).
+		Str("panic", fmt.Sprintf("%+v", v)).
+		Send()
+}
+
+func getLocalAddress(r *http.Request) string {
+	if r == nil {
+		return ""
+	}
+	localAddr, ok := r.Context().Value(http.LocalAddrContextKey).(net.Addr)
+	if ok {
+		return localAddr.String()
+	}
+	return ""
+}