fusego/debug.go

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// 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"
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"strings"
"github.com/jacobsa/fuse/fuseops"
)
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// 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()
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// Strip the "Op" from "FooOp".
return strings.TrimSuffix(t.Name(), "Op")
}
func describeRequest(op interface{}) (s string) {
v := reflect.ValueOf(op).Elem()
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// 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() {
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addComponent("inode %v", f.Interface())
}
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// Handle special cases.
switch typed := op.(type) {
case *interruptOp:
addComponent("fuseid 0x%08x", typed.FuseID)
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))
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}
// Use just the name if there is no extra info.
if len(components) == 0 {
return opName(op)
}
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// Otherwise, include the extra info.
return fmt.Sprintf("%s (%s)", opName(op), strings.Join(components, ", "))
}