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health.go
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health.go
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package health
import (
"errors"
"fmt"
"runtime"
"time"
)
// This is primarily used as syntactic sugar for libs outside this app for passing in maps easily.
// We don't rely on it internally b/c I don't want to tie interfaces to the 'health' package.
type Kvs map[string]string
type EventReceiver interface {
Event(eventName string)
EventKv(eventName string, kvs map[string]string)
EventErr(eventName string, err error) error
EventErrKv(eventName string, err error, kvs map[string]string) error
Timing(eventName string, nanoseconds int64)
TimingKv(eventName string, nanoseconds int64, kvs map[string]string)
Gauge(eventName string, value float64)
GaugeKv(eventName string, value float64, kvs map[string]string)
}
type Stream struct {
Sinks []Sink
KeyValues map[string]string
*Job
}
type Job struct {
Stream *Stream
JobName string
KeyValues map[string]string
Start time.Time
}
type CompletionStatus int
const (
Success CompletionStatus = iota
ValidationError
Panic
Error
Junk
)
var completionStatusToString = map[CompletionStatus]string{
Success: "success",
ValidationError: "validation_error",
Panic: "panic",
Error: "error",
Junk: "junk",
}
func (cs CompletionStatus) String() string {
return completionStatusToString[cs]
}
type Sink interface {
EmitEvent(job string, event string, kvs map[string]string)
EmitEventErr(job string, event string, err error, kvs map[string]string)
EmitTiming(job string, event string, nanoseconds int64, kvs map[string]string)
EmitComplete(job string, status CompletionStatus, nanoseconds int64, kvs map[string]string)
EmitGauge(job string, event string, value float64, kvs map[string]string)
}
func NewStream() *Stream {
s := &Stream{}
s.Job = s.NewJob("general")
return s
}
func (s *Stream) AddSink(sink Sink) *Stream {
s.Sinks = append(s.Sinks, sink)
return s
}
func (s *Stream) KeyValue(key string, value string) *Stream {
if s.KeyValues == nil {
s.KeyValues = make(map[string]string)
}
s.KeyValues[key] = value
return s
}
func (s *Stream) NewJob(name string) *Job {
return &Job{
Stream: s,
JobName: name,
Start: time.Now(),
}
}
func (j *Job) KeyValue(key string, value string) *Job {
if j.KeyValues == nil {
j.KeyValues = make(map[string]string)
}
j.KeyValues[key] = value
return j
}
func (j *Job) Event(eventName string) {
allKvs := j.mergedKeyValues(nil)
for _, sink := range j.Stream.Sinks {
sink.EmitEvent(j.JobName, eventName, allKvs)
}
}
func (j *Job) EventKv(eventName string, kvs map[string]string) {
allKvs := j.mergedKeyValues(kvs)
for _, sink := range j.Stream.Sinks {
sink.EmitEvent(j.JobName, eventName, allKvs)
}
}
func (j *Job) EventErr(eventName string, err error) error {
err = wrapErr(err)
allKvs := j.mergedKeyValues(nil)
for _, sink := range j.Stream.Sinks {
sink.EmitEventErr(j.JobName, eventName, err, allKvs)
}
if err, ok := err.(*UnmutedError); ok {
err.Emitted = true
}
return err
}
func (j *Job) EventErrKv(eventName string, err error, kvs map[string]string) error {
err = wrapErr(err)
allKvs := j.mergedKeyValues(kvs)
for _, sink := range j.Stream.Sinks {
sink.EmitEventErr(j.JobName, eventName, err, allKvs)
}
if err, ok := err.(*UnmutedError); ok {
err.Emitted = true
}
return err
}
func (j *Job) Timing(eventName string, nanoseconds int64) {
allKvs := j.mergedKeyValues(nil)
for _, sink := range j.Stream.Sinks {
sink.EmitTiming(j.JobName, eventName, nanoseconds, allKvs)
}
}
func (j *Job) TimingKv(eventName string, nanoseconds int64, kvs map[string]string) {
allKvs := j.mergedKeyValues(kvs)
for _, sink := range j.Stream.Sinks {
sink.EmitTiming(j.JobName, eventName, nanoseconds, allKvs)
}
}
func (j *Job) Gauge(eventName string, value float64) {
allKvs := j.mergedKeyValues(nil)
for _, sink := range j.Stream.Sinks {
sink.EmitGauge(j.JobName, eventName, value, allKvs)
}
}
func (j *Job) GaugeKv(eventName string, value float64, kvs map[string]string) {
allKvs := j.mergedKeyValues(kvs)
for _, sink := range j.Stream.Sinks {
sink.EmitGauge(j.JobName, eventName, value, allKvs)
}
}
func (j *Job) Complete(status CompletionStatus) {
allKvs := j.mergedKeyValues(nil)
for _, sink := range j.Stream.Sinks {
sink.EmitComplete(j.JobName, status, time.Since(j.Start).Nanoseconds(), allKvs)
}
}
func (j *Job) CompleteKv(status CompletionStatus, kvs map[string]string) {
allKvs := j.mergedKeyValues(kvs)
for _, sink := range j.Stream.Sinks {
sink.EmitComplete(j.JobName, status, time.Since(j.Start).Nanoseconds(), allKvs)
}
}
func (j *Job) mergedKeyValues(instanceKvs map[string]string) map[string]string {
var allKvs map[string]string
// Count how many maps actually have contents in them. If it's 0 or 1, we won't allocate a new map.
// Also, optimistically set allKvs. We might use it or we might overwrite the value with a newly made map.
var kvCount = 0
if len(j.KeyValues) > 0 {
kvCount += 1
allKvs = j.KeyValues
}
if len(j.Stream.KeyValues) > 0 {
kvCount += 1
allKvs = j.Stream.KeyValues
}
if len(instanceKvs) > 0 {
kvCount += 1
allKvs = instanceKvs
}
if kvCount > 1 {
allKvs = make(map[string]string)
for k, v := range j.Stream.KeyValues {
allKvs[k] = v
}
for k, v := range j.KeyValues {
allKvs[k] = v
}
for k, v := range instanceKvs {
allKvs[k] = v
}
}
return allKvs
}
func (s *Stream) Run(jobName string, f func() error) error {
j := s.NewJob(jobName)
return j.Run(f)
}
func (j *Job) Run(f func() error) (err error) {
defer func() {
if r := recover(); r != nil {
stack := make([]byte, 4096)
stack = stack[:runtime.Stack(stack, false)]
// recovered value from panic() is an interface{}, and it might not be `error`
// do not simply type-assert here
err = errors.New(fmt.Sprint(r))
j.EventErrKv("panic", err, Kvs{"stack": string(stack)})
j.Complete(Panic)
}
}()
err = f()
if err != nil {
j.Complete(Error)
} else {
j.Complete(Success)
}
return
}