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config.go
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config.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package config
import (
"time"
"github.com/olivere/elastic"
"github.com/pkg/errors"
"github.com/uber/jaeger/pkg/es"
)
// Configuration describes the configuration properties needed to connect to an ElasticSearch cluster
type Configuration struct {
Servers []string
Username string
Password string
Sniffer bool // https://github.com/olivere/elastic/wiki/Sniffing
MaxSpanAge time.Duration `yaml:"max_span_age"` // configures the maximum lookback on span reads
NumShards int64 `yaml:"shards"`
NumReplicas int64 `yaml:"replicas"`
}
// ClientBuilder creates new es.Client
type ClientBuilder interface {
NewClient() (es.Client, error)
GetNumShards() int64
GetNumReplicas() int64
GetMaxSpanAge() time.Duration
}
// NewClient creates a new ElasticSearch client
func (c *Configuration) NewClient() (es.Client, error) {
if len(c.Servers) < 1 {
return nil, errors.New("No servers specified")
}
rawClient, err := elastic.NewClient(c.GetConfigs()...)
if err != nil {
return nil, err
}
return es.WrapESClient(rawClient), nil
}
// ApplyDefaults copies settings from source unless its own value is non-zero.
func (c *Configuration) ApplyDefaults(source *Configuration) {
if c.Username == "" {
c.Username = source.Username
}
if c.Password == "" {
c.Password = source.Password
}
if c.Sniffer == false {
c.Sniffer = source.Sniffer
}
if c.MaxSpanAge == 0 {
c.MaxSpanAge = source.MaxSpanAge
}
if c.NumShards == 0 {
c.NumShards = source.NumShards
}
if c.NumReplicas == 0 {
c.NumReplicas = source.NumReplicas
}
}
// GetNumShards returns number of shards from Configuration
func (c *Configuration) GetNumShards() int64 {
return c.NumShards
}
// GetNumReplicas returns number of replicas from Configuration
func (c *Configuration) GetNumReplicas() int64 {
return c.NumReplicas
}
// GetMaxSpanAge returns max span age from Configuration
func (c *Configuration) GetMaxSpanAge() time.Duration {
return c.MaxSpanAge
}
// GetConfigs wraps the configs to feed to the ElasticSearch client init
func (c *Configuration) GetConfigs() []elastic.ClientOptionFunc {
options := make([]elastic.ClientOptionFunc, 3)
options[0] = elastic.SetURL(c.Servers...)
options[1] = elastic.SetBasicAuth(c.Username, c.Password)
options[2] = elastic.SetSniff(c.Sniffer)
return options
}