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options.go
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options.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 cassandra
import (
"flag"
"strings"
"github.com/spf13/viper"
"github.com/uber/jaeger/pkg/cassandra/config"
)
const (
suffixConnPerHost = ".connections-per-host"
suffixMaxRetryAttempts = ".max-retry-attempts"
suffixTimeout = ".timeout"
suffixServers = ".servers"
suffixPort = ".port"
suffixKeyspace = ".keyspace"
suffixProtoVer = ".proto-version"
suffixSocketKeepAlive = ".socket-keep-alive"
suffixUsername = ".username"
suffixPassword = ".password"
)
// TODO this should be moved next to config.Configuration struct (maybe ./flags package)
// Options contains various type of Cassandra configs and provides the ability
// to bind them to command line flag and apply overlays, so that some configurations
// (e.g. archive) may be underspecified and infer the rest of its parameters from primary.
type Options struct {
primary *namespaceConfig
others map[string]*namespaceConfig
}
// the Servers field in config.Configuration is a list, which we cannot represent with flags.
// This struct adds a plain string field that can be bound to flags and is then parsed when
// preparing the actual config.Configuration.
type namespaceConfig struct {
config.Configuration
servers string
namespace string
}
// NewOptions creates a new Options struct.
func NewOptions(primaryNamespace string, otherNamespaces ...string) *Options {
// TODO all default values should be defined via cobra flags
options := &Options{
primary: &namespaceConfig{
Configuration: config.Configuration{
MaxRetryAttempts: 3,
Keyspace: "jaeger_v1_local",
ProtoVersion: 4,
ConnectionsPerHost: 2,
},
servers: "127.0.0.1",
namespace: primaryNamespace,
},
others: make(map[string]*namespaceConfig, len(otherNamespaces)),
}
for _, namespace := range otherNamespaces {
options.others[namespace] = &namespaceConfig{namespace: namespace}
}
return options
}
// AddFlags adds flags for Options
func (opt *Options) AddFlags(flagSet *flag.FlagSet) {
addFlags(flagSet, opt.primary)
for _, cfg := range opt.others {
addFlags(flagSet, cfg)
}
}
func addFlags(flagSet *flag.FlagSet, nsConfig *namespaceConfig) {
flagSet.Int(
nsConfig.namespace+suffixConnPerHost,
nsConfig.ConnectionsPerHost,
"The number of Cassandra connections from a single backend instance")
flagSet.Int(
nsConfig.namespace+suffixMaxRetryAttempts,
nsConfig.MaxRetryAttempts,
"The number of attempts when reading from Cassandra")
flagSet.Duration(
nsConfig.namespace+suffixTimeout,
nsConfig.Timeout,
"Timeout used for queries")
flagSet.String(
nsConfig.namespace+suffixServers,
nsConfig.servers,
"The comma-separated list of Cassandra servers")
flagSet.Int(
nsConfig.namespace+suffixPort,
nsConfig.Port,
"The port for cassandra")
flagSet.String(
nsConfig.namespace+suffixKeyspace,
nsConfig.Keyspace,
"The Cassandra keyspace for Jaeger data")
flagSet.Int(
nsConfig.namespace+suffixProtoVer,
nsConfig.ProtoVersion,
"The Cassandra protocol version")
flagSet.Duration(
nsConfig.namespace+suffixSocketKeepAlive,
nsConfig.SocketKeepAlive,
"Cassandra's keepalive period to use, enabled if > 0")
flagSet.String(
nsConfig.namespace+suffixUsername,
nsConfig.Authenticator.Basic.Username,
"Username for password authentication for Cassandra")
flagSet.String(
nsConfig.namespace+suffixPassword,
nsConfig.Authenticator.Basic.Password,
"Password for password authentication for Cassandra")
}
// InitFromViper initializes Options with properties from viper
func (opt *Options) InitFromViper(v *viper.Viper) {
initFromViper(opt.primary, v)
for _, cfg := range opt.others {
initFromViper(cfg, v)
}
}
func initFromViper(cfg *namespaceConfig, v *viper.Viper) {
cfg.ConnectionsPerHost = v.GetInt(cfg.namespace + suffixConnPerHost)
cfg.MaxRetryAttempts = v.GetInt(cfg.namespace + suffixMaxRetryAttempts)
cfg.Timeout = v.GetDuration(cfg.namespace + suffixTimeout)
cfg.servers = v.GetString(cfg.namespace + suffixServers)
cfg.Port = v.GetInt(cfg.namespace + suffixPort)
cfg.Keyspace = v.GetString(cfg.namespace + suffixKeyspace)
cfg.ProtoVersion = v.GetInt(cfg.namespace + suffixProtoVer)
cfg.SocketKeepAlive = v.GetDuration(cfg.namespace + suffixSocketKeepAlive)
cfg.Authenticator.Basic.Username = v.GetString(cfg.namespace + suffixUsername)
cfg.Authenticator.Basic.Password = v.GetString(cfg.namespace + suffixPassword)
}
// GetPrimary returns primary configuration.
func (opt *Options) GetPrimary() *config.Configuration {
opt.primary.Servers = strings.Split(opt.primary.servers, ",")
return &opt.primary.Configuration
}
// Get returns auxiliary named configuration.
func (opt *Options) Get(namespace string) *config.Configuration {
nsCfg, ok := opt.others[namespace]
if !ok {
nsCfg = &namespaceConfig{}
opt.others[namespace] = nsCfg
}
nsCfg.Configuration.ApplyDefaults(&opt.primary.Configuration)
if nsCfg.servers == "" {
nsCfg.servers = opt.primary.servers
}
nsCfg.Servers = strings.Split(nsCfg.servers, ",")
return &nsCfg.Configuration
}