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main.go
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main.go
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package main
import (
"fmt"
"log"
"net/url"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/colinmarc/hdfs"
"github.com/stripe/sequins/backend"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
sequinsVersion string
bind = kingpin.Flag("bind", "Address to bind to. Overrides the config option of the same name.").Short('b').PlaceHolder("ADDRESS").String()
source = kingpin.Flag("source", "Where the sequencefiles are. Overrides the config option of the same name.").Short('r').PlaceHolder("URI").String()
localStore = kingpin.Flag("local-store", "Where to store local data. Overrides the config option of the same name.").Short('l').PlaceHolder("PATH").String()
configPath = kingpin.Flag("config", "The config file to use. By default, either sequins.conf in the local directory or /etc/sequins.conf will be used.").PlaceHolder("PATH").String()
debugBind = kingpin.Flag("debug-bind", "Address to bind to for pprof and expvars. Overrides the config option of the same name.").PlaceHolder("ADDRESS").String()
)
func main() {
kingpin.Version("sequins version " + sequinsVersion)
kingpin.Parse()
config, err := loadConfig(*configPath)
if err == errNoConfig {
// If --source was specified, we can just use that and the default config.
if *source != "" {
config = defaultConfig()
} else {
log.Fatal("No config file found! Please see the \"Getting Started\" guide for instructions: http://sequins.io/manual.")
}
} else if err != nil {
log.Fatal("Error loading config: ", err)
}
if *source != "" {
parsed, err := url.Parse(*source)
if err != nil {
log.Fatal(err)
}
switch parsed.Scheme {
case "":
absPath, err := filepath.Abs(parsed.Path)
if err != nil {
log.Fatal(err)
}
config.Source = absPath
default:
config.Source = *source
}
}
if config.Source == "" {
log.Fatal("The source root must be defined, either in the config file or with --source. Please see the README for instructions.")
}
if *bind != "" {
config.Bind = *bind
}
if *localStore != "" {
absPath, err := filepath.Abs(*localStore)
if err != nil {
log.Fatal(err)
}
config.LocalStore = absPath
}
if *debugBind != "" {
config.Debug.Bind = *debugBind
}
config, err = validateConfig(config)
if err != nil {
log.Fatalf("Configuration error: %s\n", err)
}
parsed, err := url.Parse(config.Source)
if err != nil {
log.Fatal(err)
}
var s *sequins
switch parsed.Scheme {
case "", "file":
s = localSetup(parsed.Path, config)
case "s3":
s = s3Setup(parsed.Host, parsed.Path, config)
case "hdfs":
s = hdfsSetup(parsed.Host, parsed.Path, config)
default:
log.Fatalf("Unrecognized scheme for path: %s://\n", parsed.Scheme)
}
// Do a basic test that the backend is valid.
_, err = s.backend.ListDBs()
if err != nil {
log.Fatalf("Error listing DBs from %s: %s", s.backend.DisplayPath(""), err)
}
err = s.init()
if err != nil {
log.Fatal(err)
}
if config.Debug.Bind != "" {
startDebugServer(config)
}
s.start()
}
func localSetup(localPath string, config sequinsConfig) *sequins {
backend := backend.NewLocalBackend(localPath)
return newSequins(backend, config)
}
func s3Setup(bucketName string, path string, config sequinsConfig) *sequins {
metadata := ec2metadata.New(session.New())
regionName := config.S3.Region
if regionName == "" {
var err error
regionName, err = metadata.Region()
if regionName == "" || err != nil {
log.Fatal("Unspecified S3 region, and no instance region found.")
}
}
creds := credentials.NewChainCredentials([]credentials.Provider{
&ec2rolecreds.EC2RoleProvider{Client: metadata},
&credentials.EnvProvider{},
&credentials.StaticProvider{Value: credentials.Value{
AccessKeyID: config.S3.AccessKeyId,
SecretAccessKey: config.S3.SecretAccessKey,
}},
})
sess := session.New(&aws.Config{
Region: aws.String(regionName),
Credentials: creds,
})
backend := backend.NewS3Backend(bucketName, path, s3.New(sess))
return newSequins(backend, config)
}
func hdfsSetup(namenode string, path string, config sequinsConfig) *sequins {
client, err := hdfs.New(namenode)
if err != nil {
log.Fatal(fmt.Errorf("Error connecting to HDFS: %s", err))
}
backend := backend.NewHdfsBackend(client, namenode, path)
return newSequins(backend, config)
}