vitess.io/vitess@v0.16.2/go/vt/vtctld/debug_health.go (about)

     1  /*
     2  Copyright 2019 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  // Package vtctld contains all the code to expose a vtctld server
    18  // based on the provided topo.Server.
    19  package vtctld
    20  
    21  import (
    22  	"net/http"
    23  
    24  	"context"
    25  
    26  	"vitess.io/vitess/go/acl"
    27  	"vitess.io/vitess/go/vt/topo"
    28  )
    29  
    30  // RegisterDebugHealthHandler register a debug health http endpoint for a vtcld server
    31  func RegisterDebugHealthHandler(ts *topo.Server) {
    32  	http.HandleFunc("/debug/health", func(w http.ResponseWriter, r *http.Request) {
    33  		if err := acl.CheckAccessHTTP(r, acl.MONITORING); err != nil {
    34  			acl.SendError(w, err)
    35  			return
    36  		}
    37  		w.Header().Set("Content-Type", "text/plain")
    38  		if err := isHealthy(ts); err != nil {
    39  			w.Write([]byte("not ok"))
    40  			return
    41  		}
    42  		w.Write([]byte("ok"))
    43  	})
    44  }
    45  
    46  func isHealthy(ts *topo.Server) error {
    47  	_, err := ts.GetKeyspaces(context.Background())
    48  	return err
    49  }