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client.go
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client.go
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// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
// Package grpchelper implements helpers to access gRPC services.
package grpchelper
import (
"context"
"errors"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"github.com/apache/skywalking-banyandb/pkg/logger"
)
// Conn returns a gRPC client connection once connecting the server.
func Conn(addr string, connTimeout time.Duration, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
defaultOpts := []grpc.DialOption{
grpc.WithBlock(),
}
opts = append(opts, defaultOpts...)
l := logger.GetLogger("grpc-helper")
connStart := time.Now()
dialCtx, dialCancel := context.WithTimeout(context.Background(), connTimeout)
defer dialCancel()
conn, err := grpc.DialContext(dialCtx, addr, opts...)
if err != nil {
if errors.Is(err, context.DeadlineExceeded) {
l.Warn().Str("addr", addr).Dur("timeout", connTimeout).Msg("timeout: failed to connect service")
} else {
l.Warn().Str("addr", addr).Err(err).Msg("error: failed to connect service")
}
return nil, err
}
connDuration := time.Since(connStart)
if e := l.Debug(); e.Enabled() {
e.Dur("conn", connDuration).Msg("time elapsed")
}
return conn, nil
}
// Request execute a input closure to send traffics.
// It provides common features like timeout, error handling, and etc.
func Request(ctx context.Context, rpcTimeout time.Duration, fn func(rpcCtx context.Context) error) error {
rpcStart := time.Now()
rpcCtx, rpcCancel := context.WithTimeout(ctx, rpcTimeout)
defer rpcCancel()
rpcCtx = metadata.NewOutgoingContext(rpcCtx, make(metadata.MD))
l := logger.GetLogger("grpc-helper")
err := fn(rpcCtx)
if err != nil {
if stat, ok := status.FromError(err); ok && stat.Code() == codes.Unimplemented {
l.Info().Str("stat", stat.Message()).Msg("error: this server does not implement the service")
} else if stat, ok := status.FromError(err); ok && stat.Code() == codes.DeadlineExceeded {
l.Info().Dur("rpcTimeout", rpcTimeout).Msg("timeout: rpc did not complete within")
} else {
l.Info().Err(err).Msg("error: rpc failed:")
}
return err
}
rpcDuration := time.Since(rpcStart)
if e := l.Debug(); e.Enabled() {
e.Dur("rpc", rpcDuration).Msg("time elapsed")
}
return nil
}