seaweedfs/weed/filer/postgres/postgres_store.go

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package postgres
import (
"database/sql"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/filer/abstract_sql"
"github.com/chrislusf/seaweedfs/weed/util"
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_ "github.com/lib/pq"
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)
const (
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CONNECTION_URL_PATTERN = "host=%s port=%d sslmode=%s connect_timeout=30"
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)
func init() {
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filer.Stores = append(filer.Stores, &PostgresStore{})
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}
type PostgresStore struct {
abstract_sql.AbstractSqlStore
}
func (store *PostgresStore) GetName() string {
return "postgres"
}
func (store *PostgresStore) Initialize(configuration util.Configuration, prefix string) (err error) {
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return store.initialize(
configuration.GetString(prefix+"username"),
configuration.GetString(prefix+"password"),
configuration.GetString(prefix+"hostname"),
configuration.GetInt(prefix+"port"),
configuration.GetString(prefix+"database"),
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configuration.GetString(prefix+"schema"),
configuration.GetString(prefix+"sslmode"),
configuration.GetInt(prefix+"connection_max_idle"),
configuration.GetInt(prefix+"connection_max_open"),
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)
}
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func (store *PostgresStore) initialize(user, password, hostname string, port int, database, schema, sslmode string, maxIdle, maxOpen int) (err error) {
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store.SupportBucketTable = false
store.SqlGenerator = &SqlGenPostgres{
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CreateTableSqlTemplate: "",
DropTableSqlTemplate: "drop table %s",
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}
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sqlUrl := fmt.Sprintf(CONNECTION_URL_PATTERN, hostname, port, sslmode)
if user != "" {
sqlUrl += " user=" + user
}
if password != "" {
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sqlUrl += " password=" + password
}
if database != "" {
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sqlUrl += " dbname=" + database
}
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if schema != "" {
sqlUrl += " search_path=" + schema
}
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var dbErr error
store.DB, dbErr = sql.Open("postgres", sqlUrl)
if dbErr != nil {
store.DB.Close()
store.DB = nil
return fmt.Errorf("can not connect to %s error:%v", sqlUrl, err)
}
store.DB.SetMaxIdleConns(maxIdle)
store.DB.SetMaxOpenConns(maxOpen)
if err = store.DB.Ping(); err != nil {
return fmt.Errorf("connect to %s error:%v", sqlUrl, err)
}
return nil
}