minio/cmd/healthcheck-handler.go

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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"net/http"
"strconv"
xhttp "github.com/minio/minio/cmd/http"
)
const unavailable = "offline"
// ClusterCheckHandler returns if the server is ready for requests.
func ClusterCheckHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "ClusterCheckHandler")
if shouldProxy() {
w.Header().Set(xhttp.MinIOServerStatus, unavailable)
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
objLayer := newObjectLayerFn()
ctx, cancel := context.WithTimeout(ctx, globalAPIConfig.getClusterDeadline())
defer cancel()
opts := HealthOptions{Maintenance: r.URL.Query().Get("maintenance") == "true"}
result := objLayer.Health(ctx, opts)
if result.WriteQuorum > 0 {
w.Header().Set(xhttp.MinIOWriteQuorum, strconv.Itoa(result.WriteQuorum))
}
if !result.Healthy {
// return how many drives are being healed if any
if result.HealingDrives > 0 {
w.Header().Set(xhttp.MinIOHealingDrives, strconv.Itoa(result.HealingDrives))
}
// As a maintenance call we are purposefully asked to be taken
// down, this is for orchestrators to know if we can safely
// take this server down, return appropriate error.
if opts.Maintenance {
writeResponse(w, http.StatusPreconditionFailed, nil, mimeNone)
} else {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
}
return
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}
// ReadinessCheckHandler Checks if the process is up. Always returns success.
func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
if shouldProxy() {
// Service not initialized yet
w.Header().Set(xhttp.MinIOServerStatus, unavailable)
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}
// LivenessCheckHandler - Checks if the process is up. Always returns success.
func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
if shouldProxy() {
// Service not initialized yet
w.Header().Set(xhttp.MinIOServerStatus, unavailable)
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}