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feat: add status probe

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Cyrille Nofficial
2022-04-15 09:20:28 +02:00
parent c23bc5cbbe
commit ccec4f70dd
33 changed files with 4191 additions and 5 deletions
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vendor/
coverage.txt
.idea/

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# See https://golangci-lint.run/usage/configuration/#config-file for more information
run:
timeout: 5m
linters:
disable-all: true
enable:
- gofmt
- golint
- goimports
fast: false
linters-settings:
gofmt:
simplify: false
issues:
exclude-use-default: false

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{
"scanSettings": {
"configMode": "AUTO",
"configExternalURL": "",
"projectToken" : ""
},
"checkRunSettings": {
"vulnerableCheckRunConclusionLevel": "success"
},
"issueSettings": {
"minSeverityLevel": "NONE"
}
}

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Apache License
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OK_COLOR=\033[32;01m
NO_COLOR=\033[0m
test:
@echo "$(OK_COLOR)==> Running tests against container deps$(NO_COLOR)"
@docker-compose up -d
@sleep 3 && \
HEALTH_GO_PG_PQ_DSN="postgres://test:test@`docker-compose port pg-pq 5432`/test?sslmode=disable" \
HEALTH_GO_PG_PGX4_DSN="postgres://test:test@`docker-compose port pg-pgx4 5432`/test?sslmode=disable" \
HEALTH_GO_MQ_DSN="amqp://guest:guest@`docker-compose port rabbit 5672`/" \
HEALTH_GO_MQ_URL="http://guest:guest@`docker-compose port rabbit 15672`/" \
HEALTH_GO_RD_DSN="redis://`docker-compose port redis 6379`/" \
HEALTH_GO_MG_DSN="mongodb://`docker-compose port mongo 27017`/" \
HEALTH_GO_MS_DSN="test:test@tcp(`docker-compose port mysql 3306`)/test?charset=utf8" \
HEALTH_GO_HTTP_URL="http://`docker-compose port http 8080`/status" \
HEALTH_GO_MD_DSN="memcached://localhost:${{ job.services.memcached.ports[11211] }}/" \
go test -cover ./... -coverprofile=coverage.txt -covermode=atomic
lint:
@echo "$(OK_COLOR)==> Linting with golangci-lint$(NO_COLOR)"
@docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.33.0 golangci-lint run -v
.PHONY: test lint

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# health-go
[![Go Report Card](https://goreportcard.com/badge/github.com/hellofresh/health-go)](https://goreportcard.com/report/github.com/hellofresh/health-go)
[![Go Doc](https://godoc.org/github.com/hellofresh/health-go?status.svg)](https://godoc.org/github.com/hellofresh/health-go)
* Exposes an HTTP handler that retrieves health status of the application
* Implements some generic checkers for the following services:
* RabbitMQ
* PostgreSQL
* Redis
* HTTP
* MongoDB
* MySQL
* gRPC
* Memcached
## Usage
The library exports `Handler` and `HandlerFunc` functions which are fully compatible with `net/http`.
Additionally, library exports `Measure` function that returns summary status for all the registered health checks,
so it can be used in non-HTTP environments.
### Handler
```go
package main
import (
"context"
"net/http"
"time"
"github.com/hellofresh/health-go/v4"
healthMysql "github.com/hellofresh/health-go/v4/checks/mysql"
)
func main() {
// add some checks on instance creation
h, _ := health.New(health.WithChecks(health.Config{
Name: "rabbitmq",
Timeout: time.Second * 5,
SkipOnErr: true,
Check: func(ctx context.Context) error {
// rabbitmq health check implementation goes here
return nil
}}, health.Config{
Name: "mongodb",
Check: func(ctx context.Context) error {
// mongo_db health check implementation goes here
return nil
},
},
))
// and then add some more if needed
h.Register(health.Config{
Name: "mysql",
Timeout: time.Second * 2,
SkipOnErr: false,
Check: healthMysql.New(healthMysql.Config{
DSN: "test:test@tcp(0.0.0.0:31726)/test?charset=utf8",
}),
})
http.Handle("/status", h.Handler())
http.ListenAndServe(":3000", nil)
}
```
### HandlerFunc
```go
package main
import (
"context"
"net/http"
"time"
"github.com/go-chi/chi"
"github.com/hellofresh/health-go/v4"
healthMysql "github.com/hellofresh/health-go/v4/checks/mysql"
)
func main() {
// add some checks on instance creation
h, _ := health.New(health.WithChecks(health.Config{
Name: "rabbitmq",
Timeout: time.Second * 5,
SkipOnErr: true,
Check: func(ctx context.Context) error {
// rabbitmq health check implementation goes here
return nil
}}, health.Config{
Name: "mongodb",
Check: func(ctx context.Context) error {
// mongo_db health check implementation goes here
return nil
},
},
))
// and then add some more if needed
h.Register(health.Config{
Name: "mysql",
Timeout: time.Second * 2,
SkipOnErr: false,
Check: healthMysql.New(healthMysql.Config{
DSN: "test:test@tcp(0.0.0.0:31726)/test?charset=utf8",
}),
})
r := chi.NewRouter()
r.Get("/status", h.HandlerFunc)
http.ListenAndServe(":3000", nil)
}
```
For more examples please check [here](https://github.com/hellofresh/health-go/blob/master/_examples/server.go)
## API Documentation
### `GET /status`
Get the health of the application.
- Method: `GET`
- Endpoint: `/status`
- Request:
```
curl localhost:3000/status
```
- Response:
HTTP/1.1 200 OK
```json
{
"status": "OK",
"timestamp": "2017-01-01T00:00:00.413567856+033:00",
"system": {
"version": "go1.8",
"goroutines_count": 4,
"total_alloc_bytes": 21321,
"heap_objects_count": 21323,
"alloc_bytes": 234523
}
}
```
HTTP/1.1 200 OK
```json
{
"status": "Partially Available",
"timestamp": "2017-01-01T00:00:00.413567856+033:00",
"failures": {
"rabbitmq": "Failed during rabbitmq health check"
},
"system": {
"version": "go1.8",
"goroutines_count": 4,
"total_alloc_bytes": 21321,
"heap_objects_count": 21323,
"alloc_bytes": 234523
}
}
```
HTTP/1.1 503 Service Unavailable
```json
{
"status": "Unavailable",
"timestamp": "2017-01-01T00:00:00.413567856+033:00",
"failures": {
"mongodb": "Failed during mongodb health check"
},
"system": {
"version": "go1.8",
"goroutines_count": 4,
"total_alloc_bytes": 21321,
"heap_objects_count": 21323,
"alloc_bytes": 234523
}
}
```
## Contributing
- Fork it
- Create your feature branch (`git checkout -b my-new-feature`)
- Commit your changes (`git commit -am 'Add some feature'`)
- Push to the branch (`git push origin my-new-feature`)
- Create new Pull Request
---
> GitHub [@hellofresh](https://github.com/hellofresh)  · 
> Medium [@engineering.hellofresh](https://engineering.hellofresh.com)

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version: '3'
services:
pg-pq:
image: postgres:9.6-alpine
ports:
- "5432"
environment:
POSTGRES_USER: test
POSTGRES_PASSWORD: test
POSTGRES_DB: test
healthcheck:
test: [ "CMD", "pg_isready" ]
interval: 10s
timeout: 5s
retries: 5
pg-pgx4:
image: postgres:9.6-alpine
ports:
- "5432"
environment:
POSTGRES_USER: test
POSTGRES_PASSWORD: test
POSTGRES_DB: test
healthcheck:
test: [ "CMD", "pg_isready" ]
interval: 10s
timeout: 5s
retries: 5
rabbit:
image: rabbitmq:3.6-management-alpine
ports:
- "5672"
- "15672"
healthcheck:
test: [ "CMD", "rabbitmqctl", "status" ]
interval: 10s
timeout: 5s
retries: 5
redis:
image: redis:3.2-alpine
ports:
- "6379"
healthcheck:
test: [ "CMD", "redis-cli", "ping" ]
interval: 10s
timeout: 5s
retries: 5
mongo:
image: mongo:3
ports:
- "27017"
healthcheck:
test: "mongo localhost:27017/test --quiet --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 2)'"
interval: 10s
timeout: 5s
retries: 5
mysql:
image: mysql:5.7
ports:
- "3306"
environment:
MYSQL_ROOT_PASSWORD: test
MYSQL_DATABASE: test
MYSQL_USER: test
MYSQL_PASSWORD: test
healthcheck:
test: [ "CMD", "mysqladmin", "ping", "-h", "localhost" ]
interval: 10s
timeout: 5s
retries: 5
memcached:
image: memcached:1.6.9-alpine
ports:
- "11211"
http:
image: pierreprinetti/apimock:latest
ports:
- "8080"
environment:
HOST: ":8080"

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vendor/github.com/hellofresh/health-go/v4/health.go generated vendored Normal file
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package health
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"runtime"
"sync"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace"
)
// Status type represents health status
type Status string
// Possible health statuses
const (
StatusOK Status = "OK"
StatusPartiallyAvailable Status = "Partially Available"
StatusUnavailable Status = "Unavailable"
StatusTimeout Status = "Timeout during health check"
)
type (
// CheckFunc is the func which executes the check.
CheckFunc func(context.Context) error
// Config carries the parameters to run the check.
Config struct {
// Name is the name of the resource to be checked.
Name string
// Timeout is the timeout defined for every check.
Timeout time.Duration
// SkipOnErr if set to true, it will retrieve StatusOK providing the error message from the failed resource.
SkipOnErr bool
// Check is the func which executes the check.
Check CheckFunc
}
// Check represents the health check response.
Check struct {
// Status is the check status.
Status Status `json:"status"`
// Timestamp is the time in which the check occurred.
Timestamp time.Time `json:"timestamp"`
// Failures holds the failed checks along with their messages.
Failures map[string]string `json:"failures,omitempty"`
// System holds information of the go process.
System `json:"system"`
}
// System runtime variables about the go process.
System struct {
// Version is the go version.
Version string `json:"version"`
// GoroutinesCount is the number of the current goroutines.
GoroutinesCount int `json:"goroutines_count"`
// TotalAllocBytes is the total bytes allocated.
TotalAllocBytes int `json:"total_alloc_bytes"`
// HeapObjectsCount is the number of objects in the go heap.
HeapObjectsCount int `json:"heap_objects_count"`
// TotalAllocBytes is the bytes allocated and not yet freed.
AllocBytes int `json:"alloc_bytes"`
}
// Health is the health-checks container
Health struct {
mu sync.Mutex
checks map[string]Config
tp trace.TracerProvider
instrumentationName string
}
checkResponse struct {
name string
skipOnErr bool
err error
}
)
// New instantiates and build new health check container
func New(opts ...Option) (*Health, error) {
h := &Health{
checks: make(map[string]Config),
tp: trace.NewNoopTracerProvider(),
}
for _, o := range opts {
if err := o(h); err != nil {
return nil, err
}
}
return h, nil
}
// Register registers a check config to be performed.
func (h *Health) Register(c Config) error {
if c.Timeout == 0 {
c.Timeout = time.Second * 2
}
if c.Name == "" {
return errors.New("health check must have a name to be registered")
}
h.mu.Lock()
defer h.mu.Unlock()
if _, ok := h.checks[c.Name]; ok {
return fmt.Errorf("health check %q is already registered", c.Name)
}
h.checks[c.Name] = c
return nil
}
// Handler returns an HTTP handler (http.HandlerFunc).
func (h *Health) Handler() http.Handler {
return http.HandlerFunc(h.HandlerFunc)
}
// HandlerFunc is the HTTP handler function.
func (h *Health) HandlerFunc(w http.ResponseWriter, r *http.Request) {
c := h.Measure(r.Context())
w.Header().Set("Content-Type", "application/json")
data, err := json.Marshal(c)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
code := http.StatusOK
if c.Status == StatusUnavailable {
code = http.StatusServiceUnavailable
}
w.WriteHeader(code)
w.Write(data)
}
type checkSpan struct {
ctx context.Context
span trace.Span
}
func newCheckSpan(ctx context.Context, tracer trace.Tracer, name string) checkSpan {
var cs checkSpan
cs.ctx, cs.span = tracer.Start(ctx, name)
return cs
}
// Measure runs all the registered health checks and returns summary status
func (h *Health) Measure(ctx context.Context) Check {
h.mu.Lock()
defer h.mu.Unlock()
tracer := h.tp.Tracer(h.instrumentationName)
ctx, span := tracer.Start(ctx, "health.Measure")
defer span.End()
status := StatusOK
total := len(h.checks)
failures := make(map[string]string)
resChan := make(chan checkResponse, total)
checkSpans := make(map[string]checkSpan)
span.SetAttributes(attribute.Int("checks", total))
var wg sync.WaitGroup
wg.Add(total)
go func() {
defer close(resChan)
wg.Wait()
}()
for _, c := range h.checks {
checkSpans[c.Name] = newCheckSpan(ctx, tracer, c.Name)
go func(c Config) {
defer wg.Done()
select {
case resChan <- checkResponse{c.Name, c.SkipOnErr, c.Check(ctx)}:
default:
}
}(c)
loop:
for {
select {
case <-time.After(c.Timeout):
failures[c.Name] = string(StatusTimeout)
status = getAvailability(status, c.SkipOnErr)
cs := checkSpans[c.Name]
cs.span.SetStatus(codes.Error, string(StatusTimeout))
cs.span.End()
break loop
case res := <-resChan:
cs := checkSpans[res.name]
if res.err != nil {
failures[res.name] = res.err.Error()
status = getAvailability(status, res.skipOnErr)
cs.span.RecordError(res.err)
}
cs.span.End()
break loop
}
}
}
span.SetAttributes(attribute.String("status", string(status)))
return newCheck(status, failures)
}
func newCheck(s Status, failures map[string]string) Check {
return Check{
Status: s,
Timestamp: time.Now(),
Failures: failures,
System: newSystemMetrics(),
}
}
func newSystemMetrics() System {
s := runtime.MemStats{}
runtime.ReadMemStats(&s)
return System{
Version: runtime.Version(),
GoroutinesCount: runtime.NumGoroutine(),
TotalAllocBytes: int(s.TotalAlloc),
HeapObjectsCount: int(s.HeapObjects),
AllocBytes: int(s.Alloc),
}
}
func getAvailability(s Status, skipOnErr bool) Status {
if skipOnErr && s != StatusUnavailable {
return StatusPartiallyAvailable
}
return StatusUnavailable
}

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vendor/github.com/hellofresh/health-go/v4/options.go generated vendored Normal file
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package health
import (
"fmt"
"go.opentelemetry.io/otel/trace"
)
// Option is the health-container options type
type Option func(*Health) error
// WithChecks adds checks to newly instantiated health-container
func WithChecks(checks ...Config) Option {
return func(h *Health) error {
for _, c := range checks {
if err := h.Register(c); err != nil {
return fmt.Errorf("could not register check %q: %w", c.Name, err)
}
}
return nil
}
}
// WithTracerProvider sets trace provider for the checks and instrumentation name that will be used
// for tracer from trace provider.
func WithTracerProvider(tp trace.TracerProvider, instrumentationName string) Option {
return func(h *Health) error {
h.tp = tp
h.instrumentationName = instrumentationName
return nil
}
}