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Add the ability to discard an event from a hook
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The Discard method has been added to the Event type so it can be called
from a hook to prevent the event from behing printed. This new method
works outside of the context of a hook too.

Fixes rs#90
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@rs
rs committed Jul 26, 2018
1 parent bae001d commit 71e1f5e
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Showing 3 changed files with 143 additions and 195 deletions.
18 changes: 13 additions & 5 deletions event.go
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Original file line number Diff line number Diff line change
Expand Up @@ -60,10 +60,12 @@ func (e *Event) write() (err error) {
if e == nil {
return nil
}
e.buf = enc.AppendEndMarker(e.buf)
e.buf = enc.AppendLineBreak(e.buf)
if e.w != nil {
_, err = e.w.WriteLevel(e.level, e.buf)
if e.level != Disabled {
e.buf = enc.AppendEndMarker(e.buf)
e.buf = enc.AppendLineBreak(e.buf)
if e.w != nil {
_, err = e.w.WriteLevel(e.level, e.buf)
}
}
eventPool.Put(e)
return
Expand All @@ -72,7 +74,13 @@ func (e *Event) write() (err error) {
// Enabled return false if the *Event is going to be filtered out by
// log level or sampling.
func (e *Event) Enabled() bool {
return e != nil
return e != nil && e.level != Disabled
}

// Discard disables the event so Msg(f) won't print it.
func (e *Event) Discard() *Event {
e.level = Disabled
return nil
}

// Msg sends the *Event with msg added as the message field if not empty.
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9 changes: 9 additions & 0 deletions hook.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,15 @@ type Hook interface {
Run(e *Event, level Level, message string)
}

// HookFunc is an adaptor to allow the use of an ordinary function
// as a Hook.
type HookFunc func(e *Event, level Level, message string)

// Run implements the Hook interface.
func (h HookFunc) Run(e *Event, level Level, message string) {
h(e, level, message)
}

// LevelHook applies a different hook for each level.
type LevelHook struct {
NoLevelHook, DebugHook, InfoHook, WarnHook, ErrorHook, FatalHook, PanicHook Hook
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311 changes: 121 additions & 190 deletions hook_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,204 +6,135 @@ import (
"testing"
)

type LevelNameHook struct{}

func (h LevelNameHook) Run(e *Event, level Level, msg string) {
levelName := level.String()
if level == NoLevel {
levelName = "nolevel"
}
e.Str("level_name", levelName)
}

type SimpleHook struct{}

func (h SimpleHook) Run(e *Event, level Level, msg string) {
e.Bool("has_level", level != NoLevel)
e.Str("test", "logged")
}

type CopyHook struct{}

func (h CopyHook) Run(e *Event, level Level, msg string) {
hasLevel := level != NoLevel
e.Bool("copy_has_level", hasLevel)
if hasLevel {
e.Str("copy_level", level.String())
}
e.Str("copy_msg", msg)
}

type NopHook struct{}

func (h NopHook) Run(e *Event, level Level, msg string) {
}

var (
levelNameHook LevelNameHook
simpleHook SimpleHook
copyHook CopyHook
nopHook NopHook
)

func TestHook(t *testing.T) {
t.Run("Message", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook)
log.Log().Msg("test message")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level_name":"nolevel","message":"test message"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("NoLevel", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook)
log.Log().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level_name":"nolevel"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Print", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook)
log.Print("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"debug","level_name":"debug"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
levelNameHook = HookFunc(func(e *Event, level Level, msg string) {
levelName := level.String()
if level == NoLevel {
levelName = "nolevel"
}
e.Str("level_name", levelName)
})
t.Run("Error", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Copy/1", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(copyHook)
log.Log().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"copy_has_level":false,"copy_msg":""}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
simpleHook = HookFunc(func(e *Event, level Level, msg string) {
e.Bool("has_level", level != NoLevel)
e.Str("test", "logged")
})
t.Run("Copy/2", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(copyHook)
log.Info().Msg("a message")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"info","copy_has_level":true,"copy_level":"info","copy_msg":"a message","message":"a message"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
copyHook = HookFunc(func(e *Event, level Level, msg string) {
hasLevel := level != NoLevel
e.Bool("copy_has_level", hasLevel)
if hasLevel {
e.Str("copy_level", level.String())
}
e.Str("copy_msg", msg)
})
t.Run("Multi", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
nopHook = HookFunc(func(e *Event, level Level, message string) {
})
t.Run("Multi/Message", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("a message")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error","has_level":true,"test":"logged","message":"a message"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Output/single/pre", func(t *testing.T) {
ignored := &bytes.Buffer{}
out := &bytes.Buffer{}
log := New(ignored).Hook(levelNameHook).Output(out)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Output/single/post", func(t *testing.T) {
ignored := &bytes.Buffer{}
out := &bytes.Buffer{}
log := New(ignored).Output(out).Hook(levelNameHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Output/multi/pre", func(t *testing.T) {
ignored := &bytes.Buffer{}
out := &bytes.Buffer{}
log := New(ignored).Hook(levelNameHook).Hook(simpleHook).Output(out)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Output/multi/post", func(t *testing.T) {
ignored := &bytes.Buffer{}
out := &bytes.Buffer{}
log := New(ignored).Output(out).Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("Output/mixed", func(t *testing.T) {
ignored := &bytes.Buffer{}
out := &bytes.Buffer{}
log := New(ignored).Hook(levelNameHook).Output(out).Hook(simpleHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("With/single/pre", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook).With().Str("with", "pre").Logger()
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","with":"pre","level_name":"error"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("With/single/post", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).With().Str("with", "post").Logger().Hook(levelNameHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","with":"post","level_name":"error"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("With/multi/pre", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook).Hook(simpleHook).With().Str("with", "pre").Logger()
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","with":"pre","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("With/multi/post", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).With().Str("with", "post").Logger().Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","with":"post","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("With/mixed", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out).Hook(levelNameHook).With().Str("with", "mixed").Logger().Hook(simpleHook)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error","with":"mixed","level_name":"error","has_level":true,"test":"logged"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
t.Run("None", func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out)
log.Error().Msg("")
if got, want := decodeIfBinaryToString(out.Bytes()), `{"level":"error"}`+"\n"; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
discardHook = HookFunc(func(e *Event, level Level, message string) {
e.Discard()
})
)

func TestHook(t *testing.T) {
tests := []struct {
name string
want string
test func(log Logger)
}{
{"Message", `{"level_name":"nolevel","message":"test message"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook)
log.Log().Msg("test message")
}},
{"NoLevel", `{"level_name":"nolevel"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook)
log.Log().Msg("")
}},
{"Print", `{"level":"debug","level_name":"debug"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook)
log.Print("")
}},
{"Error", `{"level":"error","level_name":"error"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook)
log.Error().Msg("")
}},
{"Copy/1", `{"copy_has_level":false,"copy_msg":""}` + "\n", func(log Logger) {
log = log.Hook(copyHook)
log.Log().Msg("")
}},
{"Copy/2", `{"level":"info","copy_has_level":true,"copy_level":"info","copy_msg":"a message","message":"a message"}` + "\n", func(log Logger) {
log = log.Hook(copyHook)
log.Info().Msg("a message")
}},
{"Multi", `{"level":"error","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("")
}},
{"Multi/Message", `{"level":"error","level_name":"error","has_level":true,"test":"logged","message":"a message"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("a message")
}},
{"Output/single/pre", `{"level":"error","level_name":"error"}` + "\n", func(log Logger) {
ignored := &bytes.Buffer{}
log = New(ignored).Hook(levelNameHook).Output(log.w)
log.Error().Msg("")
}},
{"Output/single/post", `{"level":"error","level_name":"error"}` + "\n", func(log Logger) {
ignored := &bytes.Buffer{}
log = New(ignored).Output(log.w).Hook(levelNameHook)
log.Error().Msg("")
}},
{"Output/multi/pre", `{"level":"error","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
ignored := &bytes.Buffer{}
log = New(ignored).Hook(levelNameHook).Hook(simpleHook).Output(log.w)
log.Error().Msg("")
}},
{"Output/multi/post", `{"level":"error","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
ignored := &bytes.Buffer{}
log = New(ignored).Output(log.w).Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("")
}},
{"Output/mixed", `{"level":"error","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
ignored := &bytes.Buffer{}
log = New(ignored).Hook(levelNameHook).Output(log.w).Hook(simpleHook)
log.Error().Msg("")
}},
{"With/single/pre", `{"level":"error","with":"pre","level_name":"error"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook).With().Str("with", "pre").Logger()
log.Error().Msg("")
}},
{"With/single/post", `{"level":"error","with":"post","level_name":"error"}` + "\n", func(log Logger) {
log = log.With().Str("with", "post").Logger().Hook(levelNameHook)
log.Error().Msg("")
}},
{"With/multi/pre", `{"level":"error","with":"pre","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook).Hook(simpleHook).With().Str("with", "pre").Logger()
log.Error().Msg("")
}},
{"With/multi/post", `{"level":"error","with":"post","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
log = log.With().Str("with", "post").Logger().Hook(levelNameHook).Hook(simpleHook)
log.Error().Msg("")
}},
{"With/mixed", `{"level":"error","with":"mixed","level_name":"error","has_level":true,"test":"logged"}` + "\n", func(log Logger) {
log = log.Hook(levelNameHook).With().Str("with", "mixed").Logger().Hook(simpleHook)
log.Error().Msg("")
}},
{"Discard", "", func(log Logger) {
log = log.Hook(discardHook)
log.Log().Msg("test message")
}},
{"None", `{"level":"error"}` + "\n", func(log Logger) {
log.Error().Msg("")
}},
}
for _, tt := range tests {
tt := tt
t.Run(tt.name, func(t *testing.T) {
out := &bytes.Buffer{}
log := New(out)
tt.test(log)
if got, want := decodeIfBinaryToString(out.Bytes()), tt.want; got != want {
t.Errorf("invalid log output:\ngot: %v\nwant: %v", got, want)
}
})
}
}

func BenchmarkHooks(b *testing.B) {
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