forked from jaegertracing/jaeger
/
builder.go
94 lines (83 loc) · 3.45 KB
/
builder.go
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// Copyright (c) 2018-2019 The Jaeger Authors.
//
// Licensed 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 grpc
import (
"errors"
"fmt"
"strings"
grpc_retry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/resolver/manual"
"github.com/jaegertracing/jaeger/pkg/config/tlscfg"
"github.com/jaegertracing/jaeger/pkg/discovery"
"github.com/jaegertracing/jaeger/pkg/discovery/grpcresolver"
)
// ConnBuilder Struct to hold configurations
type ConnBuilder struct {
// CollectorHostPorts is list of host:port Jaeger Collectors.
CollectorHostPorts []string `yaml:"collectorHostPorts"`
MaxRetry uint
TLS tlscfg.Options
DiscoveryMinPeers int
Notifier discovery.Notifier
Discoverer discovery.Discoverer
}
// NewConnBuilder creates a new grpc connection builder.
func NewConnBuilder() *ConnBuilder {
return &ConnBuilder{}
}
// CreateConnection creates the gRPC connection
func (b *ConnBuilder) CreateConnection(logger *zap.Logger) (*grpc.ClientConn, error) {
var dialOptions []grpc.DialOption
var dialTarget string
if b.TLS.Enabled { // user requested a secure connection
logger.Info("Agent requested secure grpc connection to collector(s)")
tlsConf, err := b.TLS.Config()
if err != nil {
return nil, fmt.Errorf("failed to load TLS config: %w", err)
}
creds := credentials.NewTLS(tlsConf)
dialOptions = append(dialOptions, grpc.WithTransportCredentials(creds))
} else { // insecure connection
logger.Info("Agent requested insecure grpc connection to collector(s)")
dialOptions = append(dialOptions, grpc.WithInsecure())
}
if b.Notifier != nil && b.Discoverer != nil {
logger.Info("Using external discovery service with roundrobin load balancer")
grpcResolver := grpcresolver.New(b.Notifier, b.Discoverer, logger, b.DiscoveryMinPeers)
dialTarget = grpcResolver.Scheme() + ":///round_robin"
} else {
if b.CollectorHostPorts == nil {
return nil, errors.New("at least one collector hostPort address is required when resolver is not available")
}
if len(b.CollectorHostPorts) > 1 {
r, _ := manual.GenerateAndRegisterManualResolver()
var resolvedAddrs []resolver.Address
for _, addr := range b.CollectorHostPorts {
resolvedAddrs = append(resolvedAddrs, resolver.Address{Addr: addr})
}
r.InitialState(resolver.State{Addresses: resolvedAddrs})
dialTarget = r.Scheme() + ":///round_robin"
logger.Info("Agent is connecting to a static list of collectors", zap.String("dialTarget", dialTarget), zap.String("collector hosts", strings.Join(b.CollectorHostPorts, ",")))
} else {
dialTarget = b.CollectorHostPorts[0]
}
}
dialOptions = append(dialOptions, grpc.WithDefaultServiceConfig(grpcresolver.GRPCServiceConfig))
dialOptions = append(dialOptions, grpc.WithUnaryInterceptor(grpc_retry.UnaryClientInterceptor(grpc_retry.WithMax(b.MaxRetry))))
return grpc.Dial(dialTarget, dialOptions...)
}