Improved the readability of debug logging.

connection.go

@@ -476,9 +476,9 @@ func (c *Connection) Reply(ctx context.Context, opErr error) {
 	// Debug logging
 	if c.debugLogger != nil {
 		if opErr == nil {
-			c.debugLog(fuseID, 1, "-> OK: %s", describeResponse(op))
+			c.debugLog(fuseID, 1, "-> OK")
 		} else {
-			c.debugLog(fuseID, 1, "-> error: %v", opErr)
+			c.debugLog(fuseID, 1, "-> Error: %q", opErr.Error())
 		}
 	}
 

debug.go

@@ -17,31 +17,55 @@ package fuse
 import (
 	"fmt"
 	"reflect"
+	"strings"
+
+	"github.com/jacobsa/fuse/fuseops"
 )
 
-func describeRequest(op interface{}) (s string) {
-	// Handle special cases with custom formatting.
-	switch typed := op.(type) {
-	case *interruptOp:
-		s = fmt.Sprintf("interruptOp(fuseid=0x%08x)", typed.FuseID)
-		return
-	}
+// Decide on the name of the given op.
+func opName(op interface{}) string {
+	// We expect all ops to be pointers.
+	t := reflect.TypeOf(op).Elem()
 
+	// Strip the "Op" from "FooOp".
+	return strings.TrimSuffix(t.Name(), "Op")
+}
+
+func describeRequest(op interface{}) (s string) {
 	v := reflect.ValueOf(op).Elem()
-	t := v.Type()
 
-	// Find the inode number involved, if possible.
-	var inodeDesc string
+	// We will set up a comma-separated list of components.
+	var components []string
+	addComponent := func(format string, v ...interface{}) {
+		components = append(components, fmt.Sprintf(format, v...))
+	}
+
+	// Include an inode number, if available.
 	if f := v.FieldByName("Inode"); f.IsValid() {
-		inodeDesc = fmt.Sprintf("(inode=%v)", f.Interface())
+		addComponent("inode %v", f.Interface())
 	}
 
-	// Use the type name.
-	s = fmt.Sprintf("%s%s", t.Name(), inodeDesc)
+	// Handle special cases.
+	switch typed := op.(type) {
+	case *interruptOp:
+		addComponent("fuseid 0x%08x", typed.FuseID)
 
-	return
-}
+	case *fuseops.ReadFileOp:
+		addComponent("handle %d", typed.Handle)
+		addComponent("offset %d", typed.Offset)
+		addComponent("%d bytes", len(typed.Dst))
+
+	case *fuseops.WriteFileOp:
+		addComponent("handle %d", typed.Handle)
+		addComponent("offset %d", typed.Offset)
+		addComponent("%d bytes", len(typed.Data))
+	}
+
+	// Use just the name if there is no extra info.
+	if len(components) == 0 {
+		return opName(op)
+	}
 
-func describeResponse(op interface{}) (s string) {
-	return describeRequest(op)
+	// Otherwise, include the extra info.
+	return fmt.Sprintf("%s (%s)", opName(op), strings.Join(components, ", "))
 }