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cluster.go
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cluster.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 (
"crypto/tls"
"strings"
"github.com/gocql/gocql"
"github.com/uber/cadence/common/service/config"
)
// NewCassandraCluster creates a cassandra cluster from a given configuration
func NewCassandraCluster(cfg config.Cassandra) *gocql.ClusterConfig {
hosts := parseHosts(cfg.Hosts)
cluster := gocql.NewCluster(hosts...)
cluster.ProtoVersion = 4
if cfg.Port > 0 {
cluster.Port = cfg.Port
}
if cfg.User != "" && cfg.Password != "" {
cluster.Authenticator = gocql.PasswordAuthenticator{
Username: cfg.User,
Password: cfg.Password,
}
}
if cfg.Keyspace != "" {
cluster.Keyspace = cfg.Keyspace
}
if cfg.Datacenter != "" {
cluster.HostFilter = gocql.DataCentreHostFilter(cfg.Datacenter)
}
if cfg.Region != "" {
cluster.HostFilter = RegionHostFilter(cfg.Region)
}
if cfg.TLS != nil && cfg.TLS.Enabled {
cluster.SslOpts = &gocql.SslOptions{
CertPath: cfg.TLS.CertFile,
KeyPath: cfg.TLS.KeyFile,
CaPath: cfg.TLS.CaFile,
EnableHostVerification: cfg.TLS.EnableHostVerification,
Config: &tls.Config{
ServerName: cfg.TLS.ServerName,
},
}
}
if cfg.MaxConns > 0 {
cluster.NumConns = cfg.MaxConns
}
cluster.PoolConfig.HostSelectionPolicy = gocql.TokenAwareHostPolicy(gocql.RoundRobinHostPolicy())
return cluster
}
// RegionHostFilter returns a gocql host filter for the given region name
func RegionHostFilter(region string) gocql.HostFilter {
return gocql.HostFilterFunc(func(host *gocql.HostInfo) bool {
applicationRegion := region
if len(host.DataCenter()) < 3 {
return false
}
return host.DataCenter()[:3] == applicationRegion
})
}
func parseHosts(input string) []string {
var hosts = make([]string, 0)
for _, h := range strings.Split(input, ",") {
if host := strings.TrimSpace(h); len(host) > 0 {
hosts = append(hosts, host)
}
}
return hosts
}