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bulider.go
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bulider.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 tchannel
import (
"github.com/pkg/errors"
"github.com/uber/jaeger-lib/metrics"
"github.com/uber/tchannel-go"
"go.uber.org/zap"
"github.com/uber/jaeger/pkg/discovery"
"github.com/uber/jaeger/pkg/discovery/peerlistmgr"
)
const (
defaultMinPeers = 3
agentServiceName = "jaeger-agent"
defaultCollectorServiceName = "jaeger-collector"
)
// Builder Struct to hold configurations
type Builder struct {
// CollectorHostPorts are host:ports of a static list of Jaeger Collectors.
CollectorHostPorts []string `yaml:"collectorHostPorts"`
// MinPeers is the min number of servers we want the agent to connect to.
// If zero, defaults to min(3, number of peers returned by service discovery)
DiscoveryMinPeers int `yaml:"minPeers"`
// CollectorServiceName is the name that Jaeger Collector's TChannel server
// responds to.
CollectorServiceName string `yaml:"collectorServiceName"`
discoverer discovery.Discoverer
notifier discovery.Notifier
channel *tchannel.Channel
}
// NewBuilder creates a new reporter builder.
func NewBuilder() *Builder {
return &Builder{}
}
// WithDiscoverer sets service discovery
func (b *Builder) WithDiscoverer(d discovery.Discoverer) *Builder {
b.discoverer = d
return b
}
// WithDiscoveryNotifier sets service discovery notifier
func (b *Builder) WithDiscoveryNotifier(n discovery.Notifier) *Builder {
b.notifier = n
return b
}
// WithCollectorServiceName sets collector service name
func (b *Builder) WithCollectorServiceName(s string) *Builder {
b.CollectorServiceName = s
return b
}
// WithChannel sets tchannel channel
func (b *Builder) WithChannel(c *tchannel.Channel) *Builder {
b.channel = c
return b
}
func (b *Builder) enableDiscovery(channel *tchannel.Channel, logger *zap.Logger) (*peerlistmgr.PeerListManager, error) {
if b.discoverer == nil && b.notifier == nil {
return nil, nil
}
if b.discoverer == nil || b.notifier == nil {
return nil, errors.New("both discovery.Discoverer and discovery.Notifier must be specified")
}
logger.Info("Enabling service discovery", zap.String("service", b.CollectorServiceName))
subCh := channel.GetSubChannel(b.CollectorServiceName, tchannel.Isolated)
peers := subCh.Peers()
return peerlistmgr.New(peers, b.discoverer, b.notifier,
peerlistmgr.Options.MinPeers(defaultInt(b.DiscoveryMinPeers, defaultMinPeers)),
peerlistmgr.Options.Logger(logger))
}
// CreateReporter creates the TChannel-based Reporter
func (b *Builder) CreateReporter(mFactory metrics.Factory, logger *zap.Logger) (*Reporter, error) {
if b.channel == nil {
// ignore errors since it only happens on empty service name
b.channel, _ = tchannel.NewChannel(agentServiceName, nil)
}
if b.CollectorServiceName == "" {
b.CollectorServiceName = defaultCollectorServiceName
}
// Use static collectors if specified.
if len(b.CollectorHostPorts) != 0 {
d := discovery.FixedDiscoverer(b.CollectorHostPorts)
b = b.WithDiscoverer(d).WithDiscoveryNotifier(&discovery.Dispatcher{})
}
peerListMgr, err := b.enableDiscovery(b.channel, logger)
if err != nil {
return nil, errors.Wrap(err, "cannot enable service discovery")
}
return New(b.CollectorServiceName, b.channel, peerListMgr, mFactory, logger), nil
}
func defaultInt(value int, defaultVal int) int {
if value == 0 {
value = defaultVal
}
return value
}