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Make logging more efficient

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This commit is contained in:
binwiederhier 2023-02-07 22:10:51 -05:00
parent d44a11325d
commit 2f0fdf1252
5 changed files with 168 additions and 60 deletions
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104
log/event.go
View file

@ -13,88 +13,95 @@ import (
const (
tagField = "tag"
errorField = "error"
exitCodeField = "exit_code"
timestampFormat = "2006-01-02T15:04:05.999Z07:00"
)
// Event represents a single log event
type Event struct {
Timestamp string `json:"time"`
Level Level `json:"level"`
Message string `json:"message"`
fields Context
Timestamp string `json:"time"`
Level Level `json:"level"`
Message string `json:"message"`
time time.Time
contexters []Contexter
fields Context
}
// newEvent creates a new log event
//
// We delay allocations and processing for efficiency, because most log events
// are never actually rendered, so we don't format the time, or allocate a fields map.
func newEvent() *Event {
now := time.Now()
return &Event{
Timestamp: now.Format(timestampFormat),
fields: make(Context),
time: time.Now(),
}
}
// Fatal logs the event as FATAL, and exits the program with exit code 1
func (e *Event) Fatal(message string, v ...any) {
e.Field("exit_code", 1).Log(FatalLevel, message, v...)
e.Field(exitCodeField, 1).maybeLog(FatalLevel, message, v...)
fmt.Fprintf(os.Stderr, message+"\n", v...) // Always output error to stderr
os.Exit(1)
}
// Error logs the event with log level error
func (e *Event) Error(message string, v ...any) {
e.Log(ErrorLevel, message, v...)
e.maybeLog(ErrorLevel, message, v...)
}
// Warn logs the event with log level warn
func (e *Event) Warn(message string, v ...any) {
e.Log(WarnLevel, message, v...)
e.maybeLog(WarnLevel, message, v...)
}
// Info logs the event with log level info
func (e *Event) Info(message string, v ...any) {
e.Log(InfoLevel, message, v...)
e.maybeLog(InfoLevel, message, v...)
}
// Debug logs the event with log level debug
func (e *Event) Debug(message string, v ...any) {
e.Log(DebugLevel, message, v...)
e.maybeLog(DebugLevel, message, v...)
}
// Trace logs the event with log level trace
func (e *Event) Trace(message string, v ...any) {
e.Log(TraceLevel, message, v...)
e.maybeLog(TraceLevel, message, v...)
}
// Tag adds a "tag" field to the log event
func (e *Event) Tag(tag string) *Event {
e.fields[tagField] = tag
return e
return e.Field(tagField, tag)
}
// Time sets the time field
func (e *Event) Time(t time.Time) *Event {
e.Timestamp = t.Format(timestampFormat)
e.time = t
return e
}
// Err adds an "error" field to the log event
func (e *Event) Err(err error) *Event {
if c, ok := err.(Contexter); ok {
e.Fields(c.Context())
} else {
e.fields[errorField] = err.Error()
return e.Fields(c.Context())
}
return e
return e.Field(errorField, err.Error())
}
// Field adds a custom field and value to the log event
func (e *Event) Field(key string, value any) *Event {
if e.fields == nil {
e.fields = make(Context)
}
e.fields[key] = value
return e
}
// Fields adds a map of fields to the log event
func (e *Event) Fields(fields Context) *Event {
if e.fields == nil {
e.fields = make(Context)
}
for k, v := range fields {
e.fields[k] = v
}
@ -103,22 +110,36 @@ func (e *Event) Fields(fields Context) *Event {
// With adds the fields of the given Contexter structs to the log event by calling their With method
func (e *Event) With(contexts ...Contexter) *Event {
for _, c := range contexts {
e.Fields(c.Context())
if e.contexters == nil {
e.contexters = contexts
} else {
e.contexters = append(e.contexters, contexts...)
}
return e
}
// Log logs a message with the given log level
func (e *Event) Log(l Level, message string, v ...any) {
// maybeLog logs the event to the defined output. The event is only logged, if
// either the global log level is >= l, or if the log level in one of the overrides matches
// the level.
//
// If no overrides are defined (default), the Contexter array is not applied unless the event
// is actually logged. If overrides are defined, then Contexters have to be applied in any case
// to determine if they match. This is super complicated, but required for efficiency.
func (e *Event) maybeLog(l Level, message string, v ...any) {
appliedContexters := e.maybeApplyContexters()
if !e.shouldLog(l) {
return
}
e.Message = fmt.Sprintf(message, v...)
e.Level = l
if e.shouldPrint() {
if CurrentFormat() == JSONFormat {
log.Println(e.JSON())
} else {
log.Println(e.String())
}
e.Timestamp = e.time.Format(timestampFormat)
if !appliedContexters {
e.applyContexters()
}
if CurrentFormat() == JSONFormat {
log.Println(e.JSON())
} else {
log.Println(e.String())
}
}
@ -161,14 +182,17 @@ func (e *Event) String() string {
return fmt.Sprintf("%s %s (%s)", e.Level.String(), e.Message, strings.Join(fields, ", "))
}
func (e *Event) shouldPrint() bool {
return e.globalLevelWithOverride() <= e.Level
func (e *Event) shouldLog(l Level) bool {
return e.globalLevelWithOverride() <= l
}
func (e *Event) globalLevelWithOverride() Level {
mu.Lock()
l, ov := level, overrides
mu.Unlock()
if e.fields == nil {
return l
}
for field, override := range ov {
value, exists := e.fields[field]
if exists && value == override.value {
@ -177,3 +201,19 @@ func (e *Event) globalLevelWithOverride() Level {
}
return l
}
func (e *Event) maybeApplyContexters() bool {
mu.Lock()
hasOverrides := len(overrides) > 0
mu.Unlock()
if hasOverrides {
e.applyContexters()
}
return hasOverrides // = applied
}
func (e *Event) applyContexters() {
for _, c := range e.contexters {
e.Fields(c.Context())
}
}

116
log/log_test.go
View file

@ -1,9 +1,8 @@
package log_test
package log
import (
"bytes"
"github.com/stretchr/testify/require"
"heckel.io/ntfy/log"
"os"
"testing"
"time"
@ -12,7 +11,7 @@ import (
func TestMain(m *testing.M) {
exitCode := m.Run()
resetState()
log.SetLevel(log.ErrorLevel) // For other modules!
SetLevel(ErrorLevel) // For other modules!
os.Exit(exitCode)
}
@ -27,22 +26,21 @@ func TestLog_TagContextFieldFields(t *testing.T) {
Message: "some error",
}
var out bytes.Buffer
log.SetOutput(&out)
log.SetFormat(log.JSONFormat)
log.SetLevelOverride("tag", "stripe", log.DebugLevel)
SetOutput(&out)
SetFormat(JSONFormat)
SetLevelOverride("tag", "stripe", DebugLevel)
log.
Tag("mytag").
Tag("mytag").
Field("field2", 123).
Field("field1", "value1").
Time(time.Unix(123, 999000000).UTC()).
Info("hi there %s", "phil")
log.
Tag("not-stripe").
Tag("not-stripe").
Debug("this message will not appear")
log.
With(v).
Fields(log.Context{
With(v).
Fields(Context{
"stripe_customer_id": "acct_123",
"stripe_subscription_id": "sub_123",
}).
@ -57,6 +55,76 @@ func TestLog_TagContextFieldFields(t *testing.T) {
require.Equal(t, expected, out.String())
}
func TestLog_NoAllocIfNotPrinted(t *testing.T) {
t.Cleanup(resetState)
v := &fakeVisitor{
UserID: "u_abc",
IP: "1.2.3.4",
}
var out bytes.Buffer
SetOutput(&out)
SetFormat(JSONFormat)
// Do not log, do not call contexters (because global level is INFO)
v.contextCalled = false
ev := With(v)
ev.Debug("some message")
require.False(t, v.contextCalled)
require.Equal(t, "", ev.Timestamp)
require.Equal(t, Level(0), ev.Level)
require.Equal(t, "", ev.Message)
require.Nil(t, ev.fields)
// Logged because info level, contexters called
v.contextCalled = false
ev = With(v).Time(time.Unix(1111, 0).UTC())
ev.Info("some message")
require.True(t, v.contextCalled)
require.NotNil(t, ev.fields)
require.Equal(t, "1.2.3.4", ev.fields["visitor_ip"])
// Not logged, but contexters called, because overrides exist
SetLevel(DebugLevel)
SetLevelOverride("tag", "overridetag", TraceLevel)
v.contextCalled = false
ev = Tag("sometag").Field("field", "value").With(v).Time(time.Unix(123, 0).UTC())
ev.Trace("some debug message")
require.True(t, v.contextCalled) // If there are overrides, we must call the context to determine the filter fields
require.Equal(t, "", ev.Timestamp)
require.Equal(t, Level(0), ev.Level)
require.Equal(t, "", ev.Message)
require.Equal(t, 4, len(ev.fields))
require.Equal(t, "value", ev.fields["field"])
require.Equal(t, "sometag", ev.fields["tag"])
// Logged because of override tag, and contexters called
v.contextCalled = false
ev = Tag("overridetag").Field("field", "value").With(v).Time(time.Unix(123, 0).UTC())
ev.Trace("some trace message")
require.True(t, v.contextCalled)
require.Equal(t, "1970-01-01T00:02:03Z", ev.Timestamp)
require.Equal(t, TraceLevel, ev.Level)
require.Equal(t, "some trace message", ev.Message)
// Logged because of field override, and contexters called
ResetLevelOverrides()
SetLevelOverride("visitor_ip", "1.2.3.4", TraceLevel)
v.contextCalled = false
ev = With(v).Time(time.Unix(124, 0).UTC())
ev.Trace("some trace message with override")
require.True(t, v.contextCalled)
require.Equal(t, "1970-01-01T00:02:04Z", ev.Timestamp)
require.Equal(t, TraceLevel, ev.Level)
require.Equal(t, "some trace message with override", ev.Message)
expected := `{"time":"1970-01-01T00:18:31Z","level":"INFO","message":"some message","user_id":"u_abc","visitor_ip":"1.2.3.4"}
{"time":"1970-01-01T00:02:03Z","level":"TRACE","message":"some trace message","field":"value","tag":"overridetag","user_id":"u_abc","visitor_ip":"1.2.3.4"}
{"time":"1970-01-01T00:02:04Z","level":"TRACE","message":"some trace message with override","user_id":"u_abc","visitor_ip":"1.2.3.4"}
`
require.Equal(t, expected, out.String())
}
type fakeError struct {
Code int
Message string
@ -66,28 +134,30 @@ func (e fakeError) Error() string {
return e.Message
}
func (e fakeError) Context() log.Context {
return log.Context{
func (e fakeError) Context() Context {
return Context{
"error": e.Message,
"error_code": e.Code,
}
}
type fakeVisitor struct {
UserID string
IP string
UserID string
IP string
contextCalled bool
}
func (v *fakeVisitor) Context() log.Context {
return log.Context{
func (v *fakeVisitor) Context() Context {
v.contextCalled = true
return Context{
"user_id": v.UserID,
"visitor_ip": v.IP,
}
}
func resetState() {
log.SetLevel(log.DefaultLevel)
log.SetFormat(log.DefaultFormat)
log.SetOutput(log.DefaultOutput)
log.ResetLevelOverrides()
SetLevel(DefaultLevel)
SetFormat(DefaultFormat)
SetOutput(DefaultOutput)
ResetLevelOverrides()
}

1
log/types.go
View file

@ -94,7 +94,6 @@ func ToFormat(s string) Format {
// Contexter allows structs to export a key-value pairs in the form of a Context
type Contexter interface {
// Context returns the object context as key-value pairs
Context() Context
}