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handler.go
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handler.go
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// Copyright (c) 2023, Roel Schut. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package healthcheck
import (
"encoding/json"
"net/http"
)
// PathPattern is the default path for a http handler.
const PathPattern = "/healthy"
var okBytes = []byte("ok")
// SimpleHTTPHandler is a [http.Handler] that writes a default "ok" message.
func SimpleHTTPHandler() http.Handler {
return http.HandlerFunc(func(wri http.ResponseWriter, _ *http.Request) {
_, _ = wri.Write(okBytes)
})
}
// HTTPHandler returns a [http.Handler] that writes the health status of the
// provided [HealthChecker] hc. If hc is a [Checker], the response will be a
// json object containing the individual statuses of all registered
// [HealthChecker](s) in hc when health status is not [StatusHealthy].
func HTTPHandler(hc HealthChecker) http.Handler {
if hc == nil {
panic(panicNilHealthChecker)
}
if checker, ok := hc.(*Checker); ok {
return http.HandlerFunc(func(wri http.ResponseWriter, req *http.Request) {
stat := checker.CheckHealth(req.Context())
wri.WriteHeader(stat.StatusCode())
if stat == StatusHealthy {
_, _ = wri.Write(okBytes)
} else {
wri.Header().Set("Content-Type", "application/json")
_ = json.NewEncoder(wri).Encode(checker.Statuses())
}
})
}
return http.HandlerFunc(func(wri http.ResponseWriter, req *http.Request) {
stat := hc.CheckHealth(req.Context())
wri.WriteHeader(stat.StatusCode())
if stat == StatusHealthy {
_, _ = wri.Write(okBytes)
} else {
_, _ = wri.Write([]byte(stat.String()))
}
})
}