/
loggers.go
77 lines (68 loc) · 1.85 KB
/
loggers.go
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// Package loggers centrally manages *zap.Logger throughout and across packages.
package loggers
import (
"fmt"
"strings"
"github.com/takumakei/go-funcname"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// Setter is type of the function that the package receives the logger.
type Setter func(*zap.Logger)
var (
setters = make(map[string]Setter)
names []string
)
// Register registers the setter function by its package name.
// It panics if the package name is already registered.
func Register(setter Setter) {
name, pkgname := funcname.Of(setter)
if _, ok := setters[pkgname]; ok {
panic(fmt.Sprintf("'%s(.%s)' has already been registered", pkgname, name))
}
setters[pkgname] = setter
names = append(names, pkgname)
}
// RegisterName registers the setter function by name.
// It panics if name is already registered.
func RegisterName(setter Setter, name string) {
if _, ok := setters[name]; ok {
panic(fmt.Sprintf("'%s' has already been registered", name))
}
setters[name] = setter
names = append(names, name)
}
// Names returns names registered.
func Names() []string {
return append(make([]string, 0, len(names)), names...)
}
// SetLogger calls registered setter functions by name.
// Each name may have a log level suffix like '=debug'.
func SetLogger(logger *zap.Logger, names ...string) error {
levels := newLevels(logger)
for _, s := range names {
name, level := splitName(s)
setter, ok := setters[name]
if !ok {
return fmt.Errorf("not registered %q", name)
}
if len(level) > 0 {
var lvl zapcore.Level
if err := lvl.Set(level); err != nil {
return fmt.Errorf("%w %q(%s)", err, level, name)
}
setter(levels.Get(lvl))
} else {
setter(logger)
}
}
return nil
}
func splitName(s string) (name, level string) {
if i := strings.IndexByte(s, '='); i == -1 {
name = s
} else {
name, level = s[:i], s[i+1:]
}
return
}