81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
// Copyright (c) 2019 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package fxlog
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import (
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"fmt"
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"log"
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"os"
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"strings"
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"go.uber.org/fx/internal/fxreflect"
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)
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var _exit = func() { os.Exit(1) }
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// Printer is a formatting printer.
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type Printer interface {
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Printf(string, ...interface{})
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}
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// New returns a new Logger backed by the standard library's log package.
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func New() *Logger {
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return &Logger{log.New(os.Stderr, "", log.LstdFlags)}
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}
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// A Logger writes output to standard error.
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type Logger struct {
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Printer
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}
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// Printf logs a formatted Fx line.
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func (l *Logger) Printf(format string, v ...interface{}) {
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l.Printer.Printf(prepend(format), v...)
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}
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// PrintProvide logs a type provided into the dig.Container.
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func (l *Logger) PrintProvide(t interface{}) {
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for _, rtype := range fxreflect.ReturnTypes(t) {
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l.Printf("PROVIDE\t%s <= %s", rtype, fxreflect.FuncName(t))
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}
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}
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// PrintSignal logs an os.Signal.
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func (l *Logger) PrintSignal(signal os.Signal) {
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l.Printf(strings.ToUpper(signal.String()))
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}
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// Panic logs an Fx line then panics.
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func (l *Logger) Panic(err error) {
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l.Printer.Printf(prepend(err.Error()))
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panic(err)
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}
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// Fatalf logs an Fx line then fatals.
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func (l *Logger) Fatalf(format string, v ...interface{}) {
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l.Printer.Printf(prepend(format), v...)
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_exit()
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}
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func prepend(str string) string {
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return fmt.Sprintf("[Fx] %s", str)
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}
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