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grpc-health.go
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grpc-health.go
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// Copyright (c) 2021 6 River Systems
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package services
import (
"context"
"time"
health "google.golang.org/grpc/health/grpc_health_v1"
"go.6river.tech/mmmbbb/ent"
)
// TODO: this could be moved to common and implemented in terms of the generic
// EntClient
type healthServer struct {
health.UnimplementedHealthServer
client *ent.Client
readies []ReadyCheck
}
func (s *healthServer) Check(ctx context.Context, req *health.HealthCheckRequest) (*health.HealthCheckResponse, error) {
if s.client == nil || s.readies == nil {
return &health.HealthCheckResponse{
Status: health.HealthCheckResponse_NOT_SERVING,
}, nil
}
// if we can't verify readiness within a second, things are probably in pretty
// bad shape
ctx, cancel := context.WithTimeout(ctx, time.Second)
defer cancel()
if err := s.client.DB().PingContext(ctx); err != nil {
return &health.HealthCheckResponse{
Status: health.HealthCheckResponse_NOT_SERVING,
}, nil
}
// TODO: restore ready-by-service support
if req.Service != "" {
return &health.HealthCheckResponse{
Status: health.HealthCheckResponse_SERVICE_UNKNOWN,
}, nil
}
for _, r := range s.readies {
if err := r.Ready(); err != nil {
return &health.HealthCheckResponse{
Status: health.HealthCheckResponse_NOT_SERVING,
}, nil
}
}
return &health.HealthCheckResponse{
Status: health.HealthCheckResponse_SERVING,
}, nil
}