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config.go
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config.go
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// Copyright (c) 2020 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 discovery provides discovery configuration.
package discovery
import (
"fmt"
etcdclient "github.com/m3db/m3/src/cluster/client/etcd"
"github.com/m3db/m3/src/dbnode/environment"
)
const (
defaultEnvironment = "default_env"
defaultZone = "embedded"
defaultM3DBService = "m3db"
defaultM3AggregatorService = "m3aggregator"
defaultCacheDirectory = "/var/lib/m3kv"
defaultSingleNodeClusterEndpoint = "127.0.0.1:2379"
defaultSingleNodeClusterSeedEndpoint = "http://127.0.0.1:2380"
)
var validDiscoveryConfigTypes = []ConfigurationType{
ConfigType,
M3DBSingleNodeType,
M3DBClusterType,
M3AggregatorClusterType,
}
// ConfigurationType defines the type of discovery configuration.
type ConfigurationType uint
const (
// ConfigType defines a generic definition for service discovery via etcd.
ConfigType ConfigurationType = iota
// M3DBSingleNodeType defines configuration for a single M3DB node via etcd.
M3DBSingleNodeType
// M3DBClusterType defines M3DB discovery via etcd.
M3DBClusterType
// M3AggregatorClusterType defines M3DB discovery via etcd.
M3AggregatorClusterType
)
// UnmarshalYAML unmarshals an ConfigurationType into a valid type from string.
func (t *ConfigurationType) UnmarshalYAML(unmarshal func(interface{}) error) error {
var str string
if err := unmarshal(&str); err != nil {
return err
}
// If unspecified, use default mode.
if str == "" {
*t = ConfigType
return nil
}
for _, valid := range validDiscoveryConfigTypes {
if str == valid.String() {
*t = valid
return nil
}
}
return fmt.Errorf("invalid ConfigurationType '%s' valid types are: %s",
str, validDiscoveryConfigTypes)
}
// String returns the discovery configuration type as a string.
func (t ConfigurationType) String() string {
switch t {
case ConfigType:
return "config"
case M3DBSingleNodeType:
return "m3db_single_node"
case M3DBClusterType:
return "m3db_cluster"
case M3AggregatorClusterType:
return "m3aggregator_cluster"
}
return "unknown"
}
// Configuration defines how services are to be discovered.
type Configuration struct {
// Type defines the type of discovery configuration being used.
Type *ConfigurationType `yaml:"type"`
// M3DBCluster defines M3DB discovery via etcd.
M3DBCluster *M3DBClusterDiscoveryConfiguration `yaml:"m3dbCluster"`
// M3AggregatorCluster defines M3Aggregator discovery via etcd.
M3AggregatorCluster *M3AggregatorClusterDiscoveryConfiguration `yaml:"m3AggregatorCluster"`
// Config defines a generic definition for service discovery via etcd.
Config *environment.Configuration `yaml:"config"`
}
// M3DBClusterDiscoveryConfiguration defines discovery configuration for M3DB.
type M3DBClusterDiscoveryConfiguration struct {
Env string `yaml:"env" validate:"nonzero"`
Zone *string `yaml:"zone"`
Endpoints []string `yaml:"endpoints"`
}
// M3AggregatorClusterDiscoveryConfiguration defines discovery configuration for M3Aggregator.
type M3AggregatorClusterDiscoveryConfiguration struct {
Env string `yaml:"env"`
Zone *string `yaml:"zone"`
Endpoints []string `yaml:"endpoints"`
}
// EnvironmentConfig provides the environment configuration
// based on the type of discovery configuration set.
func (c *Configuration) EnvironmentConfig(
hostID string,
) (environment.Configuration, error) {
discoveryConfigType := ConfigType
if c.Type != nil {
discoveryConfigType = *c.Type
}
switch discoveryConfigType {
case ConfigType:
return *c.Config, nil
case M3DBSingleNodeType:
return c.m3dbSingleNodeEnvConfig(hostID), nil
case M3DBClusterType:
return c.envConfig(
discoveryConfigType,
defaultM3DBService,
c.M3DBCluster.Zone,
c.M3DBCluster.Env,
c.M3DBCluster.Endpoints,
)
case M3AggregatorClusterType:
return c.envConfig(
discoveryConfigType,
defaultM3AggregatorService,
c.M3AggregatorCluster.Zone,
c.M3AggregatorCluster.Env,
c.M3AggregatorCluster.Endpoints,
)
}
return environment.Configuration{}, fmt.Errorf("unrecognized discovery type: %d", c.Type)
}
func (c *Configuration) m3dbSingleNodeEnvConfig(
hostID string,
) environment.Configuration {
return environment.Configuration{
Services: []*environment.DynamicCluster{
{
Service: &etcdclient.Configuration{
Service: defaultM3DBService,
CacheDir: defaultCacheDirectory,
Zone: defaultZone,
Env: defaultEnvironment,
ETCDClusters: []etcdclient.ClusterConfig{
{
Zone: defaultZone,
Endpoints: []string{defaultSingleNodeClusterEndpoint},
},
},
},
},
},
SeedNodes: &environment.SeedNodesConfig{
InitialCluster: []environment.SeedNode{
{
HostID: hostID,
Endpoint: defaultSingleNodeClusterSeedEndpoint,
},
},
},
}
}
func (c *Configuration) envConfig(
configType ConfigurationType,
service string,
zone *string,
env string,
endpoints []string,
) (environment.Configuration, error) {
if c == nil {
err := fmt.Errorf("discovery configuration required for type: %s",
configType.String())
return environment.Configuration{}, err
}
validZone := defaultZone
if zone != nil {
validZone = *zone
}
return environment.Configuration{
Services: []*environment.DynamicCluster{
{
Service: &etcdclient.Configuration{
Service: service,
CacheDir: defaultCacheDirectory,
Zone: validZone,
Env: env,
ETCDClusters: []etcdclient.ClusterConfig{
{
Zone: validZone,
Endpoints: endpoints,
},
},
},
},
},
}, nil
}