fusego/debug.go

135 lines
3.5 KiB
Go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fuse
import (
"fmt"
"reflect"
"strings"
"github.com/jacobsa/fuse/fuseops"
)
// 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()
// 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() {
addComponent("inode %v", f.Interface())
}
// Include a parent inode number, if available.
if f := v.FieldByName("Parent"); f.IsValid() {
addComponent("parent %v", f.Interface())
}
// Include a name, if available.
if f := v.FieldByName("Name"); f.IsValid() {
addComponent("name %q", f.Interface())
}
// Handle special cases.
switch typed := op.(type) {
case *interruptOp:
addComponent("fuseid 0x%08x", typed.FuseID)
case *unknownOp:
addComponent("opcode %d", typed.OpCode)
case *fuseops.SetInodeAttributesOp:
if typed.Size != nil {
addComponent("size %d", *typed.Size)
}
if typed.Mode != nil {
addComponent("mode %v", *typed.Mode)
}
if typed.Atime != nil {
addComponent("atime %v", *typed.Atime)
}
if typed.Mtime != nil {
addComponent("mtime %v", *typed.Mtime)
}
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))
case *fuseops.RemoveXattrOp:
addComponent("name %s", typed.Name)
case *fuseops.GetXattrOp:
addComponent("name %s", typed.Name)
case *fuseops.SetXattrOp:
addComponent("name %s", typed.Name)
case *fuseops.FallocateOp:
addComponent("offset %d", typed.Offset)
addComponent("length %d", typed.Length)
addComponent("mode %d", typed.Mode)
}
// Use just the name if there is no extra info.
if len(components) == 0 {
return opName(op)
}
// Otherwise, include the extra info.
return fmt.Sprintf("%s (%s)", opName(op), strings.Join(components, ", "))
}
func describeResponse(op interface{}) string {
v := reflect.ValueOf(op).Elem()
// 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 a resulting inode number, if available.
if f := v.FieldByName("Entry"); f.IsValid() {
if entry, ok := f.Interface().(fuseops.ChildInodeEntry); ok {
addComponent("inode %v", entry.Child)
}
}
return fmt.Sprintf("%s", strings.Join(components, ", "))
}