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options.go
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options.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 cassandra
import (
"flag"
"strings"
"time"
"github.com/spf13/viper"
"github.com/jaegertracing/jaeger/pkg/cassandra/config"
)
const (
// session settings
suffixEnabled = ".enabled"
suffixConnPerHost = ".connections-per-host"
suffixMaxRetryAttempts = ".max-retry-attempts"
suffixTimeout = ".timeout"
suffixReconnectInterval = ".reconnect-interval"
suffixServers = ".servers"
suffixPort = ".port"
suffixKeyspace = ".keyspace"
suffixConsistency = ".consistency"
suffixProtoVer = ".proto-version"
suffixSocketKeepAlive = ".socket-keep-alive"
suffixUsername = ".username"
suffixPassword = ".password"
suffixTLS = ".tls"
suffixCert = ".tls.cert"
suffixKey = ".tls.key"
suffixCA = ".tls.ca"
suffixServerName = ".tls.server-name"
suffixVerifyHost = ".tls.verify-host"
// common storage settings
suffixSpanStoreWriteCacheTTL = ".span-store-write-cache-ttl"
)
// 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
SpanStoreWriteCacheTTL time.Duration
}
// 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
primary bool
Enabled bool
}
// 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{
TLS: config.TLS{
Enabled: false,
EnableHostVerification: true,
},
MaxRetryAttempts: 3,
Keyspace: "jaeger_v1_test",
ProtoVersion: 4,
ConnectionsPerHost: 2,
ReconnectInterval: 60 * time.Second,
},
servers: "127.0.0.1",
namespace: primaryNamespace,
primary: true,
Enabled: true,
},
others: make(map[string]*namespaceConfig, len(otherNamespaces)),
SpanStoreWriteCacheTTL: time.Hour * 12,
}
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)
}
flagSet.Duration(opt.primary.namespace+suffixSpanStoreWriteCacheTTL,
opt.SpanStoreWriteCacheTTL,
"The duration to wait before rewriting an existing service or operation name")
}
func addFlags(flagSet *flag.FlagSet, nsConfig *namespaceConfig) {
if !nsConfig.primary {
flagSet.Bool(
nsConfig.namespace+suffixEnabled,
false,
"Enable extra storage")
}
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. A Timeout of zero means no timeout")
flagSet.Duration(
nsConfig.namespace+suffixReconnectInterval,
nsConfig.ReconnectInterval,
"Reconnect interval to retry connecting to downed hosts")
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.String(
nsConfig.namespace+suffixConsistency,
nsConfig.Consistency,
"The Cassandra consistency level, e.g. ANY, ONE, TWO, THREE, QUORUM, ALL, LOCAL_QUORUM, EACH_QUORUM, LOCAL_ONE (default LOCAL_ONE)")
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")
flagSet.Bool(
nsConfig.namespace+suffixTLS,
nsConfig.TLS.Enabled,
"Enable TLS")
flagSet.String(
nsConfig.namespace+suffixCert,
nsConfig.TLS.CertPath,
"Path to TLS certificate file")
flagSet.String(
nsConfig.namespace+suffixKey,
nsConfig.TLS.KeyPath,
"Path to TLS key file")
flagSet.String(
nsConfig.namespace+suffixCA,
nsConfig.TLS.CaPath,
"Path to TLS CA file")
flagSet.String(
nsConfig.namespace+suffixServerName,
nsConfig.TLS.ServerName,
"Override the TLS server name")
flagSet.Bool(
nsConfig.namespace+suffixVerifyHost,
nsConfig.TLS.EnableHostVerification,
"Enable (or disable) host key verification")
}
// InitFromViper initializes Options with properties from viper
func (opt *Options) InitFromViper(v *viper.Viper) {
opt.primary.initFromViper(v)
for _, cfg := range opt.others {
cfg.initFromViper(v)
}
opt.SpanStoreWriteCacheTTL = v.GetDuration(opt.primary.namespace + suffixSpanStoreWriteCacheTTL)
}
func (cfg *namespaceConfig) initFromViper(v *viper.Viper) {
if !cfg.primary {
cfg.Enabled = v.GetBool(cfg.namespace + suffixEnabled)
}
cfg.ConnectionsPerHost = v.GetInt(cfg.namespace + suffixConnPerHost)
cfg.MaxRetryAttempts = v.GetInt(cfg.namespace + suffixMaxRetryAttempts)
cfg.Timeout = v.GetDuration(cfg.namespace + suffixTimeout)
cfg.ReconnectInterval = v.GetDuration(cfg.namespace + suffixReconnectInterval)
cfg.servers = v.GetString(cfg.namespace + suffixServers)
cfg.Port = v.GetInt(cfg.namespace + suffixPort)
cfg.Keyspace = v.GetString(cfg.namespace + suffixKeyspace)
cfg.Consistency = v.GetString(cfg.namespace + suffixConsistency)
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)
cfg.TLS.Enabled = v.GetBool(cfg.namespace + suffixTLS)
cfg.TLS.CertPath = v.GetString(cfg.namespace + suffixCert)
cfg.TLS.KeyPath = v.GetString(cfg.namespace + suffixKey)
cfg.TLS.CaPath = v.GetString(cfg.namespace + suffixCA)
cfg.TLS.ServerName = v.GetString(cfg.namespace + suffixServerName)
cfg.TLS.EnableHostVerification = v.GetBool(cfg.namespace + suffixVerifyHost)
}
// 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
}
if !nsCfg.Enabled {
return nil
}
nsCfg.Configuration.ApplyDefaults(&opt.primary.Configuration)
if nsCfg.servers == "" {
nsCfg.servers = opt.primary.servers
}
nsCfg.Servers = strings.Split(nsCfg.servers, ",")
return &nsCfg.Configuration
}