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grpc.go
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grpc.go
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package katsubushi
import (
"context"
"fmt"
"net"
"sync/atomic"
"github.com/kayac/go-katsubushi/v2/grpc"
"github.com/pkg/errors"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
gogrpc "google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/reflection"
"google.golang.org/grpc/status"
)
const (
MaxGRPCBulkSize = 1000
)
type gRPCGenerator struct {
grpc.GeneratorServer
app *App
}
func (sv *gRPCGenerator) Fetch(ctx context.Context, req *grpc.FetchRequest) (*grpc.FetchResponse, error) {
atomic.AddInt64(&sv.app.cmdGet, 1)
id, err := sv.app.NextID()
if err != nil {
return nil, errors.Wrap(err, "failed to get id")
}
res := &grpc.FetchResponse{
Id: id,
}
return res, nil
}
func (sv *gRPCGenerator) FetchMulti(ctx context.Context, req *grpc.FetchMultiRequest) (*grpc.FetchMultiResponse, error) {
atomic.AddInt64(&sv.app.cmdGet, 1)
n := int(req.N)
if n > MaxGRPCBulkSize {
return nil, errors.Errorf("too many IDs requested: %d, n should be smaller than %d", n, MaxGRPCBulkSize)
}
if n == 0 {
n = 1
}
ids := make([]uint64, 0, n)
for i := 0; i < n; i++ {
id, err := sv.app.NextID()
if err != nil {
return nil, errors.Wrap(err, "failed to get id")
}
ids = append(ids, id)
}
res := &grpc.FetchMultiResponse{
Ids: ids,
}
return res, nil
}
func (app *App) RunGRPCServer(ctx context.Context, cfg *Config) error {
svGen := &gRPCGenerator{app: app}
svStats := &gRPCStats{app: app}
opts := []grpc_recovery.Option{
grpc_recovery.WithRecoveryHandler(grpcRecoveryFunc),
}
s := gogrpc.NewServer(grpc_middleware.WithUnaryServerChain(
grpc_recovery.UnaryServerInterceptor(opts...),
))
grpc.RegisterGeneratorServer(s, svGen)
grpc.RegisterStatsServer(s, svStats)
reflection.Register(s)
listener := cfg.GRPCListener
if listener == nil {
var err error
listener, err = net.Listen("tcp", fmt.Sprintf(":%d", cfg.GRPCPort))
if err != nil {
return errors.Wrap(err, "failed to listen")
}
}
listener = app.wrapListener(listener)
go func() {
<-ctx.Done()
log.Infof("Shutting down gRPC server")
s.Stop()
}()
log.Infof("Listening gRPC server at %s", listener.Addr())
return s.Serve(listener)
}
func grpcRecoveryFunc(p interface{}) error {
log.Errorf("panic: %v", p)
return status.Errorf(codes.Internal, "Unexpected error")
}
type gRPCStats struct {
grpc.StatsServer
app *App
}
func (sv *gRPCStats) Get(ctx context.Context, req *grpc.StatsRequest) (*grpc.StatsResponse, error) {
st := sv.app.GetStats()
return &grpc.StatsResponse{
Pid: int32(st.Pid),
Uptime: st.Uptime,
Time: st.Time,
Version: st.Version,
CurrConnections: st.CurrConnections,
TotalConnections: st.TotalConnections,
CmdGet: st.CmdGet,
GetHits: st.GetHits,
GetMisses: st.GetMisses,
}, nil
}