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| # Health Check Module | ||
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| [](https://github.com/ankorstore/yokai/actions/workflows/fxhealthcheck-ci.yml) | ||
| [](https://goreportcard.com/report/github.com/ankorstore/yokai/fxhealthcheck) | ||
| [](https://app.codecov.io/gh/ankorstore/yokai/tree/main/fxhealthcheck) | ||
| [](https://deps.dev/go/github.com%2Fankorstore%2Fyokai%2Ffxhealthcheck) | ||
| [](https://pkg.go.dev/github.com/ankorstore/yokai/fxhealthcheck) | ||
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| ## Overview | ||
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| Yokai provides a [fxhealthcheck](https://github.com/ankorstore/yokai/tree/main/fxhealthcheck) module, allowing your application to provide [K8s probes](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/). | ||
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| It wraps the [healthcheck](https://github.com/ankorstore/yokai/tree/main/healthcheck) module. | ||
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| ## Installation | ||
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| The [fxhealthcheck](https://github.com/ankorstore/yokai/tree/main/fxhealthcheck) module is automatically loaded by | ||
| the [fxcore](https://github.com/ankorstore/yokai/tree/main/fxcore). | ||
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| When you use a Yokai [application template](https://ankorstore.github.io/yokai/applications/templates/), you have nothing to install, it's ready to use. | ||
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| ## Usage | ||
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| This module will enable Yokai to collect registered [CheckerProbe](https://github.com/ankorstore/yokai/blob/main/healthcheck/probe.go) implementations, and make available to the [Checker](https://github.com/ankorstore/yokai/blob/main/healthcheck/checker.go) in | ||
| its dependency injection system. | ||
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| You can register probes for `startup`, `liveness` and / or `readiness` [checks](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/). | ||
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| The check result will be considered as success if ALL registered probes checks are successful. | ||
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| Notes: | ||
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| - to perform complex checks, you can inject dependencies to your probes implementation (ex: database, cache, etc) | ||
| - it is recommended to design your probes with a single responsibility (ex: one for database, one for cache, etc) | ||
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| ### Probes creation | ||
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| You can create your probes by implementing the [CheckerProbe](https://github.com/ankorstore/yokai/blob/main/healthcheck/probe.go) interface. | ||
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| For example: | ||
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| ```go title="internal/probe/success.go" | ||
| package probe | ||
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| import ( | ||
| "context" | ||
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| "github.com/ankorstore/yokai/healthcheck" | ||
| ) | ||
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| type SuccessProbe struct{} | ||
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| func NewSuccessProbe() *SuccessProbe { | ||
| return &SuccessProbe{} | ||
| } | ||
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| func (p *SuccessProbe) Name() string { | ||
| return "successProbe" | ||
| } | ||
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| func (p *SuccessProbe) Check(context.Context) *healthcheck.CheckerProbeResult { | ||
| return healthcheck.NewCheckerProbeResult(true, "success example message") | ||
| } | ||
| ``` | ||
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| and | ||
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| ```go title="internal/probe/failure.go" | ||
| package probe | ||
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| import ( | ||
| "context" | ||
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| "github.com/ankorstore/yokai/healthcheck" | ||
| ) | ||
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| type FailureProbe struct{} | ||
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| func NewFailureProbe() *FailureProbe { | ||
| return &FailureProbe{} | ||
| } | ||
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| func (p *FailureProbe) Name() string { | ||
| return "failureProbe" | ||
| } | ||
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| func (p *FailureProbe) Check(context.Context) *healthcheck.CheckerProbeResult { | ||
| return healthcheck.NewCheckerProbeResult(false, "failure example message") | ||
| } | ||
| ``` | ||
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| ### Probes registration | ||
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| You can register your probes for `startup`, `liveness` and / or `readiness` checks with the `AsCheckerProbe()` function: | ||
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| ```go title="internal/services.go" | ||
| package internal | ||
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| import ( | ||
| "github.com/ankorstore/yokai/fxhealthcheck" | ||
| "github.com/ankorstore/yokai/healthcheck" | ||
| "github.com/foo/bar/probe" | ||
| "go.uber.org/fx" | ||
| ) | ||
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| func ProvideServices() fx.Option { | ||
| return fx.Options( | ||
| // register the SuccessProbe probe for startup, liveness and readiness checks | ||
| fxhealthcheck.AsCheckerProbe(probe.NewSuccessProbe), | ||
| // register the FailureProbe probe for liveness checks only | ||
| fxhealthcheck.AsCheckerProbe(probe.NewFailureProbe, healthcheck.Liveness), | ||
| ) | ||
| } | ||
| ``` | ||
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| ### Probes execution | ||
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| The [fxcore](https://github.com/ankorstore/yokai/tree/main/fxcore) HTTP server will automatically: | ||
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| - expose the configured health check endpoints | ||
| - use the [Checker](https://github.com/ankorstore/yokai/blob/main/healthcheck/checker.go) to run the registered probes | ||
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| Following previous example: | ||
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| - calling the `startup` endpoint will return a `200` response: | ||
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| ```json title="[GET] /healthz" | ||
| { | ||
| "success": true, | ||
| "probes": { | ||
| "successProbe": { | ||
| "success": true, | ||
| "message": "success example message" | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
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| - calling the `liveness` endpoint will return a `500` response: | ||
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| ```json title="[GET] /livez" | ||
| { | ||
| "success": false, | ||
| "probes": { | ||
| "successProbe": { | ||
| "success": true, | ||
| "message": "success example message" | ||
| }, | ||
| "failureProbe": { | ||
| "success": false, | ||
| "message": "failure example message" | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
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| - calling the `readiness` endpoint will return a `200` response: | ||
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| ```json title="[GET] /readyz" | ||
| { | ||
| "success": true, | ||
| "probes": { | ||
| "successProbe": { | ||
| "success": true, | ||
| "message": "success example message" | ||
| } | ||
| } | ||
| } | ||
| ``` |
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