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/
config.go
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/
config.go
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package main
import (
"errors"
"fmt"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/BurntSushi/toml"
"github.com/stripe/sequins/blocks"
)
const defaultSearchPath = "sequins.conf:/etc/sequins.conf"
var errNoConfig = errors.New("no config file found")
type sequinsConfig struct {
Source string `toml:"source"`
Bind string `toml:"bind"`
MaxParallelLoads int `toml:"max_parallel_loads"`
ThrottleLoads duration `toml:"throttle_loads"`
LocalStore string `toml:"local_store"`
RefreshPeriod duration `toml:"refresh_period"`
RequireSuccessFile bool `toml:"require_success_file"`
ContentType string `toml:"content_type"`
Storage storageConfig `toml:"storage"`
S3 s3Config `toml:"s3"`
Sharding shardingConfig `toml:"sharding"`
ZK zkConfig `toml:"zk"`
Debug debugConfig `toml:"debug"`
Test testConfig `toml:"test"`
}
type storageConfig struct {
Compression blocks.Compression `toml:"compression"`
BlockSize int `toml:"block_size"`
}
type s3Config struct {
Region string `toml:"region"`
AccessKeyId string `toml:"access_key_id"`
SecretAccessKey string `toml:"secret_access_key"`
}
type shardingConfig struct {
Enabled bool `toml:"enabled"`
Replication int `toml:"replication"`
TimeToConverge duration `toml:"time_to_converge"`
ProxyTimeout duration `toml:"proxy_timeout"`
ProxyStageTimeout duration `toml:"proxy_stage_timeout"`
ClusterName string `toml:"cluster_name"`
AdvertisedHostname string `toml:"advertised_hostname"`
ShardID string `toml:"shard_id"`
}
type zkConfig struct {
Servers []string `toml:"servers"`
ConnectTimeout duration `toml:"connect_timeout"`
SessionTimeout duration `toml:"session_timeout"`
}
type debugConfig struct {
Bind string `toml:"bind"`
Expvars bool `toml:"expvars"`
Pprof bool `toml:"pprof"`
}
// testConfig has some options used in functional tests to slow sequins down
// and make it more observable.
type testConfig struct {
UpgradeDelay duration `toml:"upgrade_delay"`
AllowLocalCluster bool `toml:"allow_local_cluster"`
VersionRemoveTimeout duration `toml:"version_remove_timeout"`
S3 s3Config `toml:"s3"`
}
func defaultConfig() sequinsConfig {
return sequinsConfig{
Source: "",
Bind: "0.0.0.0:9599",
LocalStore: "/var/sequins/",
MaxParallelLoads: 0,
RefreshPeriod: duration{time.Duration(0)},
RequireSuccessFile: false,
ContentType: "",
Storage: storageConfig{
Compression: blocks.SnappyCompression,
BlockSize: 4096,
},
S3: s3Config{
Region: "",
AccessKeyId: "",
SecretAccessKey: "",
},
Sharding: shardingConfig{
Enabled: false,
Replication: 2,
TimeToConverge: duration{10 * time.Second},
ProxyTimeout: duration{100 * time.Millisecond},
ProxyStageTimeout: duration{time.Duration(0)},
ClusterName: "sequins",
AdvertisedHostname: "",
ShardID: "",
},
ZK: zkConfig{
Servers: []string{"localhost:2181"},
ConnectTimeout: duration{1 * time.Second},
SessionTimeout: duration{10 * time.Second},
},
Debug: debugConfig{
Bind: "",
Expvars: true,
Pprof: false,
},
Test: testConfig{
UpgradeDelay: duration{time.Duration(0)},
VersionRemoveTimeout: duration{time.Duration(0)},
S3: s3Config{
Region: "",
AccessKeyId: "",
SecretAccessKey: "",
},
},
}
}
func loadConfig(searchPath string) (sequinsConfig, error) {
if searchPath == "" {
searchPath = defaultSearchPath
}
config := defaultConfig()
paths := filepath.SplitList(searchPath)
for _, path := range paths {
md, err := toml.DecodeFile(path, &config)
if os.IsNotExist(err) {
continue
} else if err != nil {
return config, err
} else if len(md.Undecoded()) > 0 {
return config, fmt.Errorf("found unrecognized properties: %v", md.Undecoded())
}
return config, nil
}
return config, errNoConfig
}
func validateConfig(config sequinsConfig) (sequinsConfig, error) {
if !filepath.IsAbs(config.LocalStore) {
return config, fmt.Errorf("local store path must be absolute: %s", config.LocalStore)
}
if config.Source == "" {
return config, errors.New("source must be set")
}
parsed, err := url.Parse(config.Source)
if err != nil {
return config, fmt.Errorf("parsing source: %s", err)
}
if parsed.Scheme == "" || parsed.Scheme == "file" {
if parsed.Host != "" {
return config, fmt.Errorf("local source path is invalid (likely missing a '/'): %s", config.Source)
}
if !filepath.IsAbs(parsed.Path) {
return config, fmt.Errorf("local source path must be absolute: %s", config.Source)
}
if strings.HasPrefix(filepath.Dir(config.LocalStore), filepath.Clean(parsed.Path)) {
return config, fmt.Errorf("local store can't be within source root: %s", config.LocalStore)
}
if config.Sharding.Enabled && !config.Test.AllowLocalCluster {
return config, errors.New("you can't run sequins with sharding enabled on local paths")
}
}
switch config.Storage.Compression {
case blocks.SnappyCompression, blocks.NoCompression:
default:
return config, fmt.Errorf("unrecognized compression option: %s", config.Storage.Compression)
}
if config.Sharding.Replication <= 0 {
return config, fmt.Errorf("invalid replication factor: %d", config.Sharding.Replication)
}
return config, nil
}
type duration struct {
time.Duration
}
func (d *duration) UnmarshalText(text []byte) error {
var err error
d.Duration, err = time.ParseDuration(string(text))
return err
}
func (d duration) MarshalText() ([]byte, error) {
return []byte(d.Duration.String()), nil
}