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service_manager.go
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service_manager.go
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package builder
import (
"context"
"net"
"reflect"
"github.com/rs/zerolog"
"golang.org/x/sync/errgroup"
)
type ServiceManager struct {
Context context.Context
logger *zerolog.Logger
errGroup *errgroup.Group
Servers map[string]*Server
DependencyMap map[string]string
}
func NewServiceManager(logger *zerolog.Logger) *ServiceManager {
serviceLogger := logger.With().Str("component", "service-manager").Logger()
errGroup, ctx := errgroup.WithContext(context.Background())
return &ServiceManager{
Context: ctx,
logger: &serviceLogger,
Servers: make(map[string]*Server),
DependencyMap: make(map[string]string),
errGroup: errGroup,
}
}
func (s *ServiceManager) AddGRPCServer(server *Server) error {
s.Servers[server.Config.GRPC.ListenAddress] = server
return nil
}
func (s *ServiceManager) StartServers(ctx context.Context) error {
for serverAddress, value := range s.Servers {
address := serverAddress
serverDetails := value
// log all service details.
s.logDetails(address, &serverDetails.Config.GRPC)
s.logDetails(address, &serverDetails.Config.Gateway)
s.logDetails(address, &serverDetails.Config.Health)
s.errGroup.Go(func() error {
if dependesOn, ok := s.DependencyMap[address]; ok {
s.logger.Info().Msgf("%s waiting for %s", address, dependesOn)
<-s.Servers[dependesOn].Started // wait for started from the dependenent service.
}
grpcServer := serverDetails.Server
listener := serverDetails.Listener
s.logger.Info().Msgf("Starting %s GRPC server", address)
s.errGroup.Go(func() error {
return grpcServer.Serve(listener)
})
httpServer := serverDetails.Gateway
if httpServer.Server != nil {
s.errGroup.Go(func() error {
s.logger.Info().Msgf("Starting %s Gateway server", httpServer.Server.Addr)
if httpServer.Certs == nil || httpServer.Certs.TLSCertPath == "" {
err := httpServer.Server.ListenAndServe()
if err != nil {
return err
}
}
if httpServer.Certs.TLSCertPath != "" {
err := httpServer.Server.ListenAndServeTLS(httpServer.Certs.TLSCertPath, httpServer.Certs.TLSKeyPath)
if err != nil {
return err
}
}
return nil
})
}
if serverDetails.Health != nil {
healthServer := serverDetails.Health
healthListener, err := net.Listen("tcp", serverDetails.Config.Health.ListenAddress)
s.logger.Info().Msgf("Starting %s Health server", serverDetails.Config.Health.ListenAddress)
if err != nil {
return err
}
s.errGroup.Go(func() error {
return healthServer.GRPCServer.Serve(healthListener)
})
}
serverDetails.Started <- true // send started information.
return nil
})
}
return nil
}
func (s *ServiceManager) logDetails(address string, element interface{}) {
ref := reflect.ValueOf(element).Elem()
typeOfT := ref.Type()
for i := 0; i < ref.NumField(); i++ {
f := ref.Field(i)
s.logger.Debug().Str("address", address).Msgf("%s = %v\n", typeOfT.Field(i).Name, f.Interface())
}
}
func (s *ServiceManager) StopServers(ctx context.Context) {
for address, value := range s.Servers {
s.logger.Info().Msgf("Stopping %s GRPC server", address)
value.Server.GracefulStop()
if value.Gateway.Server != nil {
err := value.Gateway.Server.Shutdown(ctx)
if err != nil {
s.logger.Err(err).Msgf("failed to shutdown gateway for %s", address)
}
}
if value.Health != nil && value.Health.GRPCServer != nil {
value.Health.GRPCServer.GracefulStop()
}
}
}