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84 lines
2.1 KiB
84 lines
2.1 KiB
6 years ago
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package log
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import (
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"context"
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"fmt"
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"path/filepath"
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"runtime"
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"strings"
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)
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// V reports whether verbosity at the call site is at least the requested level.
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// The returned value is a boolean of type Verbose, which implements Info, Infov etc.
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// These methods will write to the Info log if called.
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// Thus, one may write either
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// if log.V(2) { log.Info("log this") }
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// or
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// log.V(2).Info("log this")
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// The second form is shorter but the first is cheaper if logging is off because it does
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// not evaluate its arguments.
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//
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// Whether an individual call to V generates a log record depends on the setting of
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// the Config.VLevel and Config.Module flags; both are off by default. If the level in the call to
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// V is at least the value of Config.VLevel, or of Config.Module for the source file containing the
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// call, the V call will log.
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// v must be more than 0.
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func V(v int32) Verbose {
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var (
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file string
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)
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if v < 0 {
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return Verbose(false)
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} else if c.V >= v {
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return Verbose(true)
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}
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if pc, _, _, ok := runtime.Caller(1); ok {
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file, _ = runtime.FuncForPC(pc).FileLine(pc)
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}
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if strings.HasSuffix(file, ".go") {
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file = file[:len(file)-3]
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}
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if slash := strings.LastIndex(file, "/"); slash >= 0 {
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file = file[slash+1:]
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}
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for filter, lvl := range c.Module {
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var match bool
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if match = filter == file; !match {
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match, _ = filepath.Match(filter, file)
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}
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if match {
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return Verbose(lvl >= v)
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}
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}
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return Verbose(false)
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}
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// Info logs a message at the info log level.
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func (v Verbose) Info(format string, args ...interface{}) {
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if v {
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h.Log(context.Background(), _infoLevel, KV(_log, fmt.Sprintf(format, args...)))
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}
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}
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// Infov logs a message at the info log level.
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func (v Verbose) Infov(ctx context.Context, args ...D) {
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if v {
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h.Log(ctx, _infoLevel, args...)
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}
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}
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// Infow logs a message with some additional context. The variadic key-value pairs are treated as they are in With.
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func (v Verbose) Infow(ctx context.Context, args ...interface{}) {
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if v {
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h.Log(ctx, _infoLevel, logw(args)...)
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}
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}
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// Close close resource.
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func (v Verbose) Close() (err error) {
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if h == nil {
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return
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}
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return h.Close()
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}
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