53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
// Package health provides some utility functions to health-check a server. The implementation
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// is based on protobuf. Users need to write their own implementations if other IDLs are used.
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package health
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import (
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"sync"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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healthpb "google.golang.org/grpc/health/grpc_health_v1"
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)
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// Server implements `service Health`.
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type Server struct {
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mu sync.Mutex
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// statusMap stores the serving status of the services this Server monitors.
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statusMap map[string]healthpb.HealthCheckResponse_ServingStatus
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}
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// NewServer returns a new Server.
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func NewServer() *Server {
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return &Server{
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statusMap: make(map[string]healthpb.HealthCheckResponse_ServingStatus),
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}
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}
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// Check implements `service Health`.
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func (s *Server) Check(ctx context.Context, in *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if in.Service == "" {
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// check the server overall health status.
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return &healthpb.HealthCheckResponse{
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Status: healthpb.HealthCheckResponse_SERVING,
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}, nil
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}
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if status, ok := s.statusMap[in.Service]; ok {
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return &healthpb.HealthCheckResponse{
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Status: status,
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}, nil
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}
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return nil, grpc.Errorf(codes.NotFound, "unknown service")
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}
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// SetServingStatus is called when need to reset the serving status of a service
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// or insert a new service entry into the statusMap.
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func (s *Server) SetServingStatus(service string, status healthpb.HealthCheckResponse_ServingStatus) {
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s.mu.Lock()
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s.statusMap[service] = status
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s.mu.Unlock()
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}
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