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grpc.go
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grpc.go
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package core
import (
"context"
"errors"
"fmt"
"net"
"github.com/anz-bank/pkg/log"
"github.com/anz-bank/sysl-go/config"
"github.com/anz-bank/sysl-go/handlerinitialiser"
grpcMiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
"google.golang.org/grpc"
"google.golang.org/grpc/grpclog"
)
type GrpcManager interface {
Interceptors() []grpc.UnaryServerInterceptor
EnabledGrpcHandlers() []handlerinitialiser.GrpcHandlerInitialiser
GrpcAdminServerConfig() *config.CommonServerConfig
GrpcPublicServerConfig() *config.CommonServerConfig
}
func configurePublicGrpcServerListener(ctx context.Context, hl GrpcManager) (func() error, error) {
server, err := newGrpcServer(hl.GrpcPublicServerConfig(), hl.Interceptors()...)
if err != nil {
return nil, err
}
// Not sure if it is possible to register multiple servers
for _, h := range hl.EnabledGrpcHandlers() {
h.RegisterServer(ctx, server)
}
var listenPublic func() error
if len(hl.EnabledGrpcHandlers()) > 0 {
listenPublic = prepareGrpcServerListener(ctx, server, *hl.GrpcPublicServerConfig())
}
return listenPublic, nil
}
func makeGrpcListenFunc(ctx context.Context, server *grpc.Server, cfg config.CommonServerConfig) func() error {
return func() error {
if cfg.TLS != nil {
log.Infof(ctx, "TLS configuration present. Preparing to serve gRPC/HTTPS for address: %s:%d", cfg.HostName, cfg.Port)
} else {
log.Infof(ctx, "TLS configuration NOT present. Preparing to serve gRPC/HTTP for address: %s:%d", cfg.HostName, cfg.Port)
}
lis, err := net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.HostName, cfg.Port))
if err != nil {
return err
}
return server.Serve(lis)
}
}
type logWriterInfo struct {
logger log.Logger
}
func (lw *logWriterInfo) Write(p []byte) (n int, err error) {
lw.logger.Info(string(p))
return len(p), nil
}
type logWriterError struct {
logger log.Logger
}
func (lw *logWriterError) Write(p []byte) (n int, err error) {
lw.logger.Error(errors.New(string(p)))
return len(p), nil
}
func prepareGrpcServerListener(ctx context.Context, server *grpc.Server, commonConfig config.CommonServerConfig) func() error {
grpclog.SetLoggerV2(
grpclog.NewLoggerV2(
&logWriterInfo{logger: log.From(ctx)},
&logWriterInfo{logger: log.From(ctx)},
&logWriterError{logger: log.From(ctx)}))
listener := makeGrpcListenFunc(ctx, server, commonConfig)
log.Infof(ctx, "configured gRPC listener for address: %s:%d", commonConfig.HostName, commonConfig.Port)
return listener
}
func unaryInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
return handler(log.With("traceid", "traceid").Onto(ctx), req)
}
// NewGrpcServer creates a grpc.Server based on passed configuration
func newGrpcServer(cfg *config.CommonServerConfig, interceptors ...grpc.UnaryServerInterceptor) (*grpc.Server, error) {
opts, err := config.ExtractGrpcServerOptions(cfg)
if err != nil {
return nil, err
}
interceptors = append(interceptors, unaryInterceptor)
opts = append(opts, grpcMiddleware.WithUnaryServerChain(
interceptors...,
))
return grpc.NewServer(opts...), nil
}