mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-06 17:16:44 +00:00
![Paddy](/assets/img/avatar_default.png)
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
126 lines
4.1 KiB
Go
126 lines
4.1 KiB
Go
/*
|
|
*
|
|
* Copyright 2017 gRPC authors.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
//go:generate ./regenerate.sh
|
|
|
|
// Package health provides a service that exposes server's health and it must be
|
|
// imported to enable support for client-side health checks.
|
|
package health
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
|
|
"google.golang.org/grpc/codes"
|
|
healthgrpc "google.golang.org/grpc/health/grpc_health_v1"
|
|
healthpb "google.golang.org/grpc/health/grpc_health_v1"
|
|
"google.golang.org/grpc/status"
|
|
)
|
|
|
|
// Server implements `service Health`.
|
|
type Server struct {
|
|
mu sync.Mutex
|
|
// statusMap stores the serving status of the services this Server monitors.
|
|
statusMap map[string]healthpb.HealthCheckResponse_ServingStatus
|
|
updates map[string]map[healthgrpc.Health_WatchServer]chan healthpb.HealthCheckResponse_ServingStatus
|
|
}
|
|
|
|
// NewServer returns a new Server.
|
|
func NewServer() *Server {
|
|
return &Server{
|
|
statusMap: map[string]healthpb.HealthCheckResponse_ServingStatus{"": healthpb.HealthCheckResponse_SERVING},
|
|
updates: make(map[string]map[healthgrpc.Health_WatchServer]chan healthpb.HealthCheckResponse_ServingStatus),
|
|
}
|
|
}
|
|
|
|
// Check implements `service Health`.
|
|
func (s *Server) Check(ctx context.Context, in *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
if servingStatus, ok := s.statusMap[in.Service]; ok {
|
|
return &healthpb.HealthCheckResponse{
|
|
Status: servingStatus,
|
|
}, nil
|
|
}
|
|
return nil, status.Error(codes.NotFound, "unknown service")
|
|
}
|
|
|
|
// Watch implements `service Health`.
|
|
func (s *Server) Watch(in *healthpb.HealthCheckRequest, stream healthgrpc.Health_WatchServer) error {
|
|
service := in.Service
|
|
// update channel is used for getting service status updates.
|
|
update := make(chan healthpb.HealthCheckResponse_ServingStatus, 1)
|
|
s.mu.Lock()
|
|
// Puts the initial status to the channel.
|
|
if servingStatus, ok := s.statusMap[service]; ok {
|
|
update <- servingStatus
|
|
} else {
|
|
update <- healthpb.HealthCheckResponse_SERVICE_UNKNOWN
|
|
}
|
|
|
|
// Registers the update channel to the correct place in the updates map.
|
|
if _, ok := s.updates[service]; !ok {
|
|
s.updates[service] = make(map[healthgrpc.Health_WatchServer]chan healthpb.HealthCheckResponse_ServingStatus)
|
|
}
|
|
s.updates[service][stream] = update
|
|
defer func() {
|
|
s.mu.Lock()
|
|
delete(s.updates[service], stream)
|
|
s.mu.Unlock()
|
|
}()
|
|
s.mu.Unlock()
|
|
|
|
var lastSentStatus healthpb.HealthCheckResponse_ServingStatus = -1
|
|
for {
|
|
select {
|
|
// Status updated. Sends the up-to-date status to the client.
|
|
case servingStatus := <-update:
|
|
if lastSentStatus == servingStatus {
|
|
continue
|
|
}
|
|
lastSentStatus = servingStatus
|
|
err := stream.Send(&healthpb.HealthCheckResponse{Status: servingStatus})
|
|
if err != nil {
|
|
return status.Error(codes.Canceled, "Stream has ended.")
|
|
}
|
|
// Context done. Removes the update channel from the updates map.
|
|
case <-stream.Context().Done():
|
|
return status.Error(codes.Canceled, "Stream has ended.")
|
|
}
|
|
}
|
|
}
|
|
|
|
// SetServingStatus is called when need to reset the serving status of a service
|
|
// or insert a new service entry into the statusMap.
|
|
func (s *Server) SetServingStatus(service string, servingStatus healthpb.HealthCheckResponse_ServingStatus) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
s.statusMap[service] = servingStatus
|
|
for _, update := range s.updates[service] {
|
|
// Clears previous updates, that are not sent to the client, from the channel.
|
|
// This can happen if the client is not reading and the server gets flow control limited.
|
|
select {
|
|
case <-update:
|
|
default:
|
|
}
|
|
// Puts the most recent update to the channel.
|
|
update <- servingStatus
|
|
}
|
|
}
|