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// Copyright 2023 The Hugo Authors. All rights reserved.
// Some functions in this file (see comments) is based on the Go source code,
// copyright The Go Authors and governed by a BSD-style license.
//
// 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 loggers
import (
"fmt"
"strings"
"sync"
"github.com/bep/logg"
"github.com/gohugoio/hugo/identity"
)
// PanicOnWarningHook panics on warnings.
var PanicOnWarningHook = func(e *logg.Entry) error {
if e.Level != logg.LevelWarn {
return nil
}
panic(e.Message)
}
func newLogLevelCounter() *logLevelCounter {
return &logLevelCounter{
counters: make(map[logg.Level]int),
}
}
func newLogOnceHandler(threshold logg.Level) *logOnceHandler {
return &logOnceHandler{
threshold: threshold,
seen: make(map[uint64]bool),
}
}
func newStopHandler(h ...logg.Handler) *stopHandler {
return &stopHandler{
handlers: h,
}
}
func newSuppressStatementsHandler(statements map[string]bool) *suppressStatementsHandler {
return &suppressStatementsHandler{
statements: statements,
}
}
type logLevelCounter struct {
mu sync.RWMutex
counters map[logg.Level]int
}
func (h *logLevelCounter) HandleLog(e *logg.Entry) error {
h.mu.Lock()
defer h.mu.Unlock()
h.counters[e.Level]++
return nil
}
var stopError = fmt.Errorf("stop")
type logOnceHandler struct {
threshold logg.Level
mu sync.Mutex
seen map[uint64]bool
}
func (h *logOnceHandler) HandleLog(e *logg.Entry) error {
if e.Level < h.threshold {
// We typically only want to enable this for warnings and above.
// The common use case is that many go routines may log the same error.
return nil
}
h.mu.Lock()
defer h.mu.Unlock()
hash := identity.HashUint64(e.Level, e.Message, e.Fields)
if h.seen[hash] {
return stopError
}
h.seen[hash] = true
return nil
}
func (h *logOnceHandler) reset() {
h.mu.Lock()
defer h.mu.Unlock()
h.seen = make(map[uint64]bool)
}
type stopHandler struct {
handlers []logg.Handler
}
// HandleLog implements logg.Handler.
func (h *stopHandler) HandleLog(e *logg.Entry) error {
for _, handler := range h.handlers {
if err := handler.HandleLog(e); err != nil {
if err == stopError {
return nil
}
return err
}
}
return nil
}
type suppressStatementsHandler struct {
statements map[string]bool
}
func (h *suppressStatementsHandler) HandleLog(e *logg.Entry) error {
for _, field := range e.Fields {
if field.Name == FieldNameStatementID {
if h.statements[field.Value.(string)] {
return stopError
}
}
}
return nil
}
// replacer creates a new log handler that does string replacement in log messages.
func replacer(repl *strings.Replacer) logg.Handler {
return logg.HandlerFunc(func(e *logg.Entry) error {
e.Message = repl.Replace(e.Message)
for i, field := range e.Fields {
if s, ok := field.Value.(string); ok {
e.Fields[i].Value = repl.Replace(s)
}
}
return nil
})
}
// whiteSpaceTrimmer creates a new log handler that trims whitespace from log messages and string fields.
func whiteSpaceTrimmer() logg.Handler {
return logg.HandlerFunc(func(e *logg.Entry) error {
e.Message = strings.TrimSpace(e.Message)
for i, field := range e.Fields {
if s, ok := field.Value.(string); ok {
e.Fields[i].Value = strings.TrimSpace(s)
}
}
return nil
})
}
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