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// Copyright 2018 The Hugo Authors. 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 herrors contains common Hugo errors and error related utilities.
package herrors
import (
"bytes"
"errors"
"fmt"
"io"
"os"
"runtime"
"runtime/debug"
"strconv"
_errors "github.com/pkg/errors"
)
// As defined in https://godoc.org/github.com/pkg/errors
type causer interface {
Cause() error
}
type stackTracer interface {
StackTrace() _errors.StackTrace
}
// PrintStackTraceFromErr prints the error's stack trace to stdoud.
func PrintStackTraceFromErr(err error) {
FprintStackTraceFromErr(os.Stdout, err)
}
// FprintStackTraceFromErr prints the error's stack trace to w.
func FprintStackTraceFromErr(w io.Writer, err error) {
if err, ok := err.(stackTracer); ok {
for _, f := range err.StackTrace() {
fmt.Fprintf(w, "%+s:%d\n", f, f)
}
}
}
// PrintStackTrace prints the current stacktrace to w.
func PrintStackTrace(w io.Writer) {
buf := make([]byte, 1<<16)
runtime.Stack(buf, true)
fmt.Fprintf(w, "%s", buf)
}
// ErrorSender is a, typically, non-blocking error handler.
type ErrorSender interface {
SendError(err error)
}
// Recover is a helper function that can be used to capture panics.
// Put this at the top of a method/function that crashes in a template:
// defer herrors.Recover()
func Recover(args ...interface{}) {
if r := recover(); r != nil {
fmt.Println("ERR:", r)
args = append(args, "stacktrace from panic: \n"+string(debug.Stack()), "\n")
fmt.Println(args...)
}
}
// Get the current goroutine id. Used only for debugging.
func GetGID() uint64 {
b := make([]byte, 64)
b = b[:runtime.Stack(b, false)]
b = bytes.TrimPrefix(b, []byte("goroutine "))
b = b[:bytes.IndexByte(b, ' ')]
n, _ := strconv.ParseUint(string(b), 10, 64)
return n
}
// ErrFeatureNotAvailable denotes that a feature is unavailable.
//
// We will, at least to begin with, make some Hugo features (SCSS with libsass) optional,
// and this error is used to signal those situations.
var ErrFeatureNotAvailable = errors.New("this feature is not available in your current Hugo version, see https://goo.gl/YMrWcn for more information")
// Must panics if err != nil.
func Must(err error) {
if err != nil {
panic(err)
}
}
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