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// Package health provides some utility functions to health-check a server. The implementation
// is based on protobuf. Users need to write their own implementations if other IDLs are used.
package health
import (
"sync"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
// 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
}
// NewServer returns a new Server.
func NewServer() *Server {
return &Server{
statusMap: make(map[string]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 in.Service == "" {
// check the server overall health status.
return &healthpb.HealthCheckResponse{
Status: healthpb.HealthCheckResponse_SERVING,
}, nil
}
if status, ok := s.statusMap[in.Service]; ok {
return &healthpb.HealthCheckResponse{
Status: status,
}, nil
}
return nil, grpc.Errorf(codes.NotFound, "unknown service")
}
// 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, status healthpb.HealthCheckResponse_ServingStatus) {
s.mu.Lock()
s.statusMap[service] = status
s.mu.Unlock()
}
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