forked from go-eagle/eagle
/
client.go
133 lines (124 loc) · 3.97 KB
/
client.go
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package grpc
import (
"context"
"crypto/tls"
"fmt"
"time"
grpcZap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
grpcPrometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
logger "github.com/oliver258/eagle/pkg/log"
"github.com/oliver258/eagle/pkg/transport/grpc/resolver/discovery"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"google.golang.org/grpc"
"google.golang.org/grpc/balancer/roundrobin"
"google.golang.org/grpc/credentials"
grpcInsecure "google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/encoding/gzip"
"google.golang.org/grpc/keepalive"
)
// Dial
func Dial(ctx context.Context, opts ...ClientOption) (*grpc.ClientConn, error) {
return dial(ctx, false, opts...)
}
func DialInsecure(ctx context.Context, opts ...ClientOption) (*grpc.ClientConn, error) {
return dial(ctx, true, opts...)
}
func dial(ctx context.Context, insecure bool, opts ...ClientOption) (*grpc.ClientConn, error) {
// default client options
options := clientOptions{
timeout: 2000 * time.Millisecond,
balancerName: roundrobin.Name,
enableGzip: true,
enableMetric: true,
disableRetry: false,
NumRetries: 2,
enableKeepalive: true,
kp: keepalive.ClientParameters{
Time: 10 * time.Second,
Timeout: time.Second,
PermitWithoutStream: false,
},
}
for _, opt := range opts {
opt(&options)
}
// merge inters
inters := []grpc.UnaryClientInterceptor{
unaryClientInterceptor(),
}
if len(options.inters) > 0 {
inters = append(inters, options.inters...)
}
// default dial option
dialOpts := []grpc.DialOption{
grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingPolicy": "%s"}`, options.balancerName)),
grpc.WithChainUnaryInterceptor(inters...),
}
if len(options.dialOpts) > 0 {
dialOpts = append(dialOpts, options.dialOpts...)
}
// service discovery
if options.discovery != nil {
dialOpts = append(dialOpts, grpc.WithResolvers(discovery.NewBuilder(
options.discovery, discovery.WithInsecure(insecure))))
}
if insecure {
dialOpts = append(dialOpts, grpc.WithTransportCredentials(grpcInsecure.NewCredentials()))
} else {
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
}
cred := credentials.NewTLS(tlsConfig)
dialOpts = append(dialOpts, grpc.WithTransportCredentials(cred))
}
if options.enableKeepalive {
kp := keepalive.ClientParameters{
Time: options.kp.Time,
Timeout: options.kp.Timeout,
PermitWithoutStream: options.kp.PermitWithoutStream,
}
dialOpts = append(dialOpts, grpc.WithKeepaliveParams(kp))
}
if options.enableGzip {
dialOpts = append(dialOpts, grpc.WithDefaultCallOptions(grpc.UseCompressor(gzip.Name)))
}
if options.enableMetric {
dialOpts = append(dialOpts,
grpc.WithChainUnaryInterceptor(grpcPrometheus.UnaryClientInterceptor),
grpc.WithChainStreamInterceptor(grpcPrometheus.StreamClientInterceptor),
)
}
// enable tracing
if options.enableTracing {
dialOpts = append(dialOpts,
grpc.WithChainUnaryInterceptor(otelgrpc.UnaryClientInterceptor()),
grpc.WithChainStreamInterceptor(otelgrpc.StreamClientInterceptor()),
)
}
if options.enableLog {
dialOpts = append(dialOpts,
grpc.WithChainUnaryInterceptor(grpcZap.UnaryClientInterceptor(logger.GetZapLogger())),
grpc.WithChainStreamInterceptor(grpcZap.StreamClientInterceptor(logger.GetZapLogger())),
)
}
if !options.disableRetry {
dialOpts = append(dialOpts,
grpc.WithDefaultServiceConfig(getRetryPolicy(options.balancerName, options.NumRetries)),
)
}
return grpc.DialContext(ctx, options.endpoint, dialOpts...)
}
func getRetryPolicy(balancerName string, numRetries int) string {
retryPolicy := `{
"loadBalancingPolicy": "%s",
"methodConfig": [{
"retryPolicy": {
"MaxAttempts": %d,
"InitialBackoff": ".01s",
"MaxBackoff": ".01s",
"BackoffMultiplier": 1.0,
"RetryableStatusCodes": [ "UNAVAILABLE" ]
}
}]}`
return fmt.Sprintf(retryPolicy, balancerName, numRetries)
}