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package log
// NewFilter wraps next and implements filtering. See the commentary on the
// Option functions for a detailed description of how to configure levels. If
// no options are provided, all leveled log events created with Debug, Info or
// Error helper methods are squelched.
func NewFilter(next Logger, options ...Option) Logger {
l := &filter{
next: next,
}
for _, option := range options {
option(l)
}
return l
}
type filter struct {
next Logger
allowed level
errNotAllowed error
}
func (l *filter) Info(msg string, keyvals ...interface{}) error {
levelAllowed := l.allowed&levelInfo != 0
if !levelAllowed {
return l.errNotAllowed
}
return l.next.Info(msg, keyvals...)
}
func (l *filter) Debug(msg string, keyvals ...interface{}) error {
levelAllowed := l.allowed&levelDebug != 0
if !levelAllowed {
return l.errNotAllowed
}
return l.next.Debug(msg, keyvals...)
}
func (l *filter) Error(msg string, keyvals ...interface{}) error {
levelAllowed := l.allowed&levelError != 0
if !levelAllowed {
return l.errNotAllowed
}
return l.next.Error(msg, keyvals...)
}
func (l *filter) With(keyvals ...interface{}) Logger {
return l.next.With(keyvals...)
}
// Option sets a parameter for the filter.
type Option func(*filter)
// AllowAll is an alias for AllowDebug.
func AllowAll() Option {
return AllowDebug()
}
// AllowDebug allows error, info and debug level log events to pass.
func AllowDebug() Option {
return allowed(levelError | levelInfo | levelDebug)
}
// AllowInfo allows error and info level log events to pass.
func AllowInfo() Option {
return allowed(levelError | levelInfo)
}
// AllowError allows only error level log events to pass.
func AllowError() Option {
return allowed(levelError)
}
// AllowNone allows no leveled log events to pass.
func AllowNone() Option {
return allowed(0)
}
func allowed(allowed level) Option {
return func(l *filter) { l.allowed = allowed }
}
// ErrNotAllowed sets the error to return from Log when it squelches a log
// event disallowed by the configured Allow[Level] option. By default,
// ErrNotAllowed is nil; in this case the log event is squelched with no
// error.
func ErrNotAllowed(err error) Option {
return func(l *filter) { l.errNotAllowed = err }
}
type level byte
const (
levelDebug level = 1 << iota
levelInfo
levelError
)