mirror of
https://github.com/unidoc/unipdf.git
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f8ac397bdf
* Lazy loading support NewPdfReaderLazy. * Change colorspace and annotations loading to lazy. Clean up page object loading. * Clear up reference resolving and remove redundant traceToObject function. * Add IsLogLevel function to logger. Can be used to avoid calling resource intensive functions except when running trace only.
146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package common
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import (
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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)
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type Logger interface {
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Error(format string, args ...interface{})
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Warning(format string, args ...interface{})
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Notice(format string, args ...interface{})
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Info(format string, args ...interface{})
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Debug(format string, args ...interface{})
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Trace(format string, args ...interface{})
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IsLogLevel(level LogLevel) bool
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}
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// DummyLogger does nothing.
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type DummyLogger struct{}
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// Error does nothing for dummy logger.
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func (DummyLogger) Error(format string, args ...interface{}) {
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}
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// Warning does nothing for dummy logger.
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func (DummyLogger) Warning(format string, args ...interface{}) {
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}
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// Notice does nothing for dummy logger.
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func (DummyLogger) Notice(format string, args ...interface{}) {
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}
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// Info does nothing for dummy logger.
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func (DummyLogger) Info(format string, args ...interface{}) {
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}
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// Debug does nothing for dummy logger.
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func (DummyLogger) Debug(format string, args ...interface{}) {
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}
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// Trace does nothing for dummy logger.
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func (DummyLogger) Trace(format string, args ...interface{}) {
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}
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// IsLogLevel returns true from dummy logger.
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func (DummyLogger) IsLogLevel(level LogLevel) bool {
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return true
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}
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// LogLevel is the verbosity level for logging.
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type LogLevel int
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const (
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LogLevelTrace LogLevel = 5
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LogLevelDebug LogLevel = 4
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LogLevelInfo LogLevel = 3
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LogLevelNotice LogLevel = 2
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LogLevelWarning LogLevel = 1
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LogLevelError LogLevel = 0
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)
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type ConsoleLogger struct {
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LogLevel LogLevel
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}
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func NewConsoleLogger(logLevel LogLevel) *ConsoleLogger {
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logger := ConsoleLogger{}
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logger.LogLevel = logLevel
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return &logger
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}
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// IsLogLevel returns true if log level is greater or equal than `level`.
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// Can be used to avoid resource intensive calls to loggers.
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func (l ConsoleLogger) IsLogLevel(level LogLevel) bool {
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return l.LogLevel >= level
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}
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func (l ConsoleLogger) Error(format string, args ...interface{}) {
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if l.LogLevel >= LogLevelError {
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prefix := "[ERROR] "
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l.output(os.Stdout, prefix, format, args...)
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}
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}
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func (l ConsoleLogger) Warning(format string, args ...interface{}) {
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if l.LogLevel >= LogLevelWarning {
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prefix := "[WARNING] "
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l.output(os.Stdout, prefix, format, args...)
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}
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}
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func (l ConsoleLogger) Notice(format string, args ...interface{}) {
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if l.LogLevel >= LogLevelNotice {
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prefix := "[NOTICE] "
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l.output(os.Stdout, prefix, format, args...)
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}
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}
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func (l ConsoleLogger) Info(format string, args ...interface{}) {
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if l.LogLevel >= LogLevelInfo {
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prefix := "[INFO] "
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l.output(os.Stdout, prefix, format, args...)
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}
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}
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func (l ConsoleLogger) Debug(format string, args ...interface{}) {
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if l.LogLevel >= LogLevelDebug {
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prefix := "[DEBUG] "
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l.output(os.Stdout, prefix, format, args...)
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}
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}
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func (l ConsoleLogger) Trace(format string, args ...interface{}) {
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if l.LogLevel >= LogLevelTrace {
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prefix := "[TRACE] "
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l.output(os.Stdout, prefix, format, args...)
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}
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}
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var Log Logger = DummyLogger{}
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func SetLogger(logger Logger) {
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Log = logger
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}
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// output writes `format`, `args` log message prefixed by the source file name, line and `prefix`
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func (l ConsoleLogger) output(f *os.File, prefix string, format string, args ...interface{}) {
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_, file, line, ok := runtime.Caller(2)
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if !ok {
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file = "???"
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line = 0
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} else {
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file = filepath.Base(file)
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}
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src := fmt.Sprintf("%s %s:%d ", prefix, file, line) + format + "\n"
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fmt.Fprintf(f, src, args...)
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}
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