Log EOF differently from other errors

3 files changed, 16 insertions, 7 deletions

diff --git a/errors.go b/errors.go
index 7ee429a..b0d0247 100644
--- a/errors.go
+++ b/errors.go
@@ -5,7 +5,10 @@ import (
 	"strings"
 )
 
-var err_unsupported_database_type = errors.New("Unsupported database type; only \"postgres\" is currently supported")
+var (
+	err_unsupported_database_type = errors.New("Unsupported database type; only \"postgres\" is currently supported")
+	err_connection_handler_eof    = errors.New("Connection handler encountered EOF")
+)
 
 type err_local_recipients_not_found_t []string
 
diff --git a/main.go b/main.go
index bf503f4..c3a2e16 100644
--- a/main.go
+++ b/main.go
@@ -2,9 +2,7 @@ package main
 
 import (
 	"context"
-	"errors"
 	"flag"
-	"io"
 	"net"
 
 	"go.lindenii.runxiyu.org/lindenii-common/clog"
@@ -31,7 +29,7 @@ func main() {
 	for {
 		conn, err := listener.Accept()
 		if err != nil {
-			clog.Error("MX: Cannot accept connection: "+err.Error())
+			clog.Error("MX: Cannot accept connection: " + err.Error())
 		}
 		clog.Info("MX: Accepted connection from " + conn.RemoteAddr().String())
 
@@ -39,10 +37,14 @@ func main() {
 			ctx, cancel := context.WithCancel(context.Background())
 			defer cancel()
 			err := handle_mx_recv_conn(ctx, conn)
-			if err != nil && !errors.Is(err, io.EOF) {
-				clog.Error("MX: Connection handler for " + conn.RemoteAddr().String() + " returned error: " + err.Error())
+			if err != nil {
+				if err == err_connection_handler_eof {
+					clog.Info("MX: Connection for " + conn.RemoteAddr().String() + " closed with EOF")
+				} else {
+					clog.Error("MX: Connection handler for " + conn.RemoteAddr().String() + " returned error: " + err.Error())
+				}
 			} else {
-				clog.Error("MX: Connection handler for " + conn.RemoteAddr().String() + " returned error: " + err.Error())
+				clog.Info("MX: Connection for " + conn.RemoteAddr().String() + " closed gracefully")
 			}
 		}()
 	}
diff --git a/mx_recv.go b/mx_recv.go
index ef8c2cc..33b4012 100644
--- a/mx_recv.go
+++ b/mx_recv.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
+	"io"
 	"net"
 	"slices"
 	"strings"
@@ -49,6 +50,9 @@ func (session *mx_recv_session) handle(ctx context.Context) error {
 	for {
 		line, err := session.buf_conn.ReadString('\n')
 		if err != nil {
+			if err == io.EOF {
+				return err_connection_handler_eof
+			}
 			return err
 		}
 		line = strings.TrimSuffix(line, "\n")