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package log
import (
"fmt"
)
// loggerCore is the essential part of Logger.
type loggerCore struct {
nonZero bool
names []string
values []interface{}
defaultLevel Level
filterLevel Level
msgMaps []func(Msg) Msg
Handlers []Handler
}
func (l loggerCore) asLogger() Logger {
return Logger{l}
}
// Returns a logger that adds the given values to logged messages.
func (l loggerCore) WithValues(v ...interface{}) Logger {
l.values = append(l.values, v...)
return l.asLogger()
}
// Returns a logger that for a given message propagates the result of `f` instead.
func (l loggerCore) WithMap(f func(m Msg) Msg) Logger {
l.msgMaps = append(l.msgMaps, f)
return l.asLogger()
}
func (l loggerCore) WithDefaultLevel(level Level) Logger {
l.defaultLevel = level
return l.asLogger()
}
func (l loggerCore) FilterLevel(minLevel Level) Logger {
if _, ok := levelFromRules(l.names); !ok {
l.filterLevel = minLevel
}
return l.asLogger()
}
func (l loggerCore) IsZero() bool {
return !l.nonZero
}
func (l loggerCore) IsEnabledFor(level Level) bool {
return !level.LessThan(l.filterLevel)
}
func (l loggerCore) LazyLog(level Level, f func() Msg) {
l.lazyLog(level, 1, f)
}
func (l loggerCore) LazyLogDefaultLevel(f func() Msg) {
l.lazyLog(l.defaultLevel, 1, f)
}
func (l loggerCore) lazyLog(level Level, skip int, f func() Msg) {
if !l.IsEnabledFor(level) {
// have a big sook
//internalLogger.Levelf(Debug, "skipped logging %v for %q", level, l.names)
return
}
r := f().Skip(skip + 1)
for i := len(l.msgMaps) - 1; i >= 0; i-- {
r = l.msgMaps[i](r)
}
l.handle(level, r)
}
func (l loggerCore) handle(level Level, m Msg) {
r := Record{
Msg: m.Skip(1),
Level: level,
Names: l.names,
}
if !l.nonZero {
panic(fmt.Sprintf("Logger uninitialized. names=%q", l.names))
}
for _, h := range l.Handlers {
h.Handle(r)
}
}
func (l loggerCore) WithNames(names ...string) Logger {
// Avoid sharing after appending. This might not be enough because some formatters might add
// more elements concurrently, or names could be empty.
l.names = append(l.names[:len(l.names):len(l.names)], names...)
return l.withFilterLevelFromRules()
}
func (l loggerCore) withFilterLevelFromRules() Logger {
level, ok := levelFromRules(l.names)
if ok {
l.filterLevel = level
}
return l.asLogger()
}
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