-
Notifications
You must be signed in to change notification settings - Fork 905
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
feat: Add health check service. Health check service starts with dubbo.
* Use grpc health check proto, ref: https://github.com/grpc-ecosystem/grpc-health-probe * Fix test config * Current health check only support triple protocol.
- Loading branch information
Stonexx
committed
Jun 14, 2022
1 parent
a0528f2
commit 5b55641
Showing
9 changed files
with
876 additions
and
3 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,185 @@ | ||
/* | ||
* Licensed to the Apache Software Foundation (ASF) under one or more | ||
* contributor license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright ownership. | ||
* The ASF licenses this file to You 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 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" | ||
) | ||
|
||
import ( | ||
"github.com/dubbogo/grpc-go/codes" | ||
"github.com/dubbogo/grpc-go/status" | ||
) | ||
|
||
import ( | ||
logger "dubbo.apache.org/dubbo-go/v3/common/logger" | ||
"dubbo.apache.org/dubbo-go/v3/config" | ||
healthpb "dubbo.apache.org/dubbo-go/v3/protocol/dubbo3/health/triple_health_v1" | ||
healthtriple "dubbo.apache.org/dubbo-go/v3/protocol/dubbo3/health/triple_health_v1" | ||
) | ||
|
||
// Server implements `service Health`. | ||
type XXX_healthServer struct { | ||
healthtriple.UnimplementedHealthServer | ||
mu sync.RWMutex | ||
// If shutdown is true, it's expected all serving status is NOT_SERVING, and | ||
// will stay in NOT_SERVING. | ||
shutdown bool | ||
// statusMap stores the serving status of the services this Server monitors. | ||
statusMap map[string]healthpb.HealthCheckResponse_ServingStatus | ||
updates map[string]map[healthtriple.Health_WatchServer]chan healthpb.HealthCheckResponse_ServingStatus | ||
} | ||
|
||
var healthServer *XXX_healthServer | ||
|
||
// NewServer returns a new Server. | ||
func NewServer() *XXX_healthServer { | ||
return &XXX_healthServer{ | ||
statusMap: map[string]healthpb.HealthCheckResponse_ServingStatus{"": healthpb.HealthCheckResponse_SERVING}, | ||
updates: make(map[string]map[healthtriple.Health_WatchServer]chan healthpb.HealthCheckResponse_ServingStatus), | ||
} | ||
} | ||
|
||
// Check implements `service Health`. | ||
func (s *XXX_healthServer) Check(ctx context.Context, in *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) { | ||
s.mu.RLock() | ||
defer s.mu.RUnlock() | ||
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 *XXX_healthServer) Watch(in *healthpb.HealthCheckRequest, stream healthtriple.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[healthtriple.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 *XXX_healthServer) SetServingStatus(service string, servingStatus healthpb.HealthCheckResponse_ServingStatus) { | ||
s.mu.Lock() | ||
defer s.mu.Unlock() | ||
if s.shutdown { | ||
logger.Infof("health: status changing for %s to %v is ignored because health service is shutdown", service, servingStatus) | ||
return | ||
} | ||
|
||
s.setServingStatusLocked(service, servingStatus) | ||
} | ||
|
||
func (s *XXX_healthServer) setServingStatusLocked(service string, servingStatus healthpb.HealthCheckResponse_ServingStatus) { | ||
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 | ||
} | ||
} | ||
|
||
// Shutdown sets all serving status to NOT_SERVING, and configures the server to | ||
// ignore all future status changes. | ||
// | ||
// This changes serving status for all services. To set status for a particular | ||
// services, call SetServingStatus(). | ||
func (s *XXX_healthServer) Shutdown() { | ||
s.mu.Lock() | ||
defer s.mu.Unlock() | ||
s.shutdown = true | ||
for service := range s.statusMap { | ||
s.setServingStatusLocked(service, healthpb.HealthCheckResponse_NOT_SERVING) | ||
} | ||
} | ||
|
||
// Resume sets all serving status to SERVING, and configures the server to | ||
// accept all future status changes. | ||
// | ||
// This changes serving status for all services. To set status for a particular | ||
// services, call SetServingStatus(). | ||
func (s *XXX_healthServer) Resume() { | ||
s.mu.Lock() | ||
defer s.mu.Unlock() | ||
s.shutdown = false | ||
for service := range s.statusMap { | ||
s.setServingStatusLocked(service, healthpb.HealthCheckResponse_SERVING) | ||
} | ||
} | ||
|
||
// Set health check interface. | ||
func init() { | ||
healthServer = NewServer() | ||
config.SetProviderService(healthServer) | ||
} | ||
|
||
func SetServingStatusServing(service string) { | ||
healthServer.SetServingStatus(service, healthpb.HealthCheckResponse_SERVING) | ||
} | ||
|
||
func SetServingStatusNotServing(service string) { | ||
healthServer.SetServingStatus(service, healthpb.HealthCheckResponse_NOT_SERVING) | ||
} |
Oops, something went wrong.