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bootstrap.go
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bootstrap.go
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package rethinkdb
import (
"fmt"
"strings"
"time"
"github.com/sirupsen/logrus"
"gopkg.in/dancannon/gorethink.v3"
)
// Wait for 60 seconds maximum on Wait() calls for rethink
var timeoutOpt = gorethink.WaitOpts{WaitFor: "all_replicas_ready", Timeout: time.Minute.Seconds()}
func makeDB(session *gorethink.Session, name string) error {
_, err := gorethink.DBCreate(name).RunWrite(session)
if err != nil {
if strings.Contains(err.Error(), "already exists") {
return nil
}
}
return err
}
// Table holds the configuration for setting up a RethinkDB table
type Table struct {
Name string
PrimaryKey interface{}
// Keys are the index names. If len(value) is 0, it is a simple index
// on the field matching the key. Otherwise, it is a compound index
// on the list of fields in the corrensponding slice value.
SecondaryIndexes map[string][]string
Config map[string]string
//JSONUnmarshaller takes a byte slice representing JSON data and knows how
//to unmarshal them into a model representing this table
JSONUnmarshaller func([]byte) (interface{}, error)
}
func (t Table) term(dbName string) gorethink.Term {
return gorethink.DB(dbName).Table(t.Name)
}
func (t Table) wait(session *gorethink.Session, dbName string) error {
resp, err := t.term(dbName).Wait(timeoutOpt).Run(session)
if resp != nil {
resp.Close()
}
if err != nil {
return err
}
// also try waiting for all table indices
resp, err = t.term(dbName).IndexWait().Run(session)
if resp != nil {
resp.Close()
}
return err
}
func (t Table) create(session *gorethink.Session, dbName string, numReplicas uint) error {
createOpts := gorethink.TableCreateOpts{
PrimaryKey: t.PrimaryKey,
Durability: "hard",
}
if _, err := gorethink.DB(dbName).TableCreate(t.Name, createOpts).RunWrite(session); err != nil {
logrus.Debugf("error when creating database: %s", err)
if !strings.Contains(err.Error(), "already exists") {
return fmt.Errorf("unable to run table creation: %s", err)
}
}
reconfigureOpts := gorethink.ReconfigureOpts{
Shards: 1,
Replicas: numReplicas,
}
if err := t.wait(session, dbName); err != nil {
return fmt.Errorf("unable to wait for table to be ready after creation: %s", err)
}
if _, err := t.term(dbName).Reconfigure(reconfigureOpts).RunWrite(session); err != nil {
return fmt.Errorf("unable to reconfigure table replication: %s", err)
}
if err := t.wait(session, dbName); err != nil {
return fmt.Errorf("unable to wait for table to be ready after reconfiguring replication: %s", err)
}
if _, err := t.term(dbName).Config().Update(t.Config).RunWrite(session); err != nil {
return fmt.Errorf("unable to configure table linearizability: %s", err)
}
if err := t.wait(session, dbName); err != nil {
return fmt.Errorf("unable to wait for table to be ready after configuring linearizability: %s", err)
}
if err := t.updateIndices(session, dbName, t.SecondaryIndexes); err != nil {
return err
}
if err := t.wait(session, dbName); err != nil {
return fmt.Errorf("unable to wait for table to be ready after creating secondary indexes: %s", err)
}
return nil
}
func (t Table) updateIndices(session *gorethink.Session, dbName string, indices map[string][]string) error {
for indexName, fieldNames := range indices {
if len(fieldNames) == 0 {
// The field name is the index name.
fieldNames = []string{indexName}
}
if _, err := t.term(dbName).IndexCreateFunc(indexName, func(row gorethink.Term) interface{} {
fields := make([]interface{}, len(fieldNames))
for i, fieldName := range fieldNames {
term := row
for _, subfield := range strings.Split(fieldName, ".") {
term = term.Field(subfield)
}
fields[i] = term
}
if len(fields) == 1 {
return fields[0]
}
return fields
}).RunWrite(session); err != nil {
if !strings.Contains(err.Error(), "already exists") {
return fmt.Errorf("unable to create secondary index %q: %s", indexName, err)
}
}
}
return nil
}
// SetupDB handles creating the database and creating all tables and indexes.
func SetupDB(session *gorethink.Session, dbName string, tables []Table) error {
if err := makeDB(session, dbName); err != nil {
return fmt.Errorf("unable to create database: %s", err)
}
cursor, err := gorethink.DB("rethinkdb").Table("server_config").Count().Run(session)
if err != nil {
return fmt.Errorf("unable to query db server config: %s", err)
}
var replicaCount uint
if err := cursor.One(&replicaCount); err != nil {
return fmt.Errorf("unable to scan db server config count: %s", err)
}
for _, table := range tables {
if err = table.create(session, dbName, replicaCount); err != nil {
return fmt.Errorf("unable to create table %q: %s", table.Name, err)
}
}
return nil
}
// CreateAndGrantDBUser handles creating a rethink user and granting it permissions to the provided db.
func CreateAndGrantDBUser(session *gorethink.Session, dbName, username, password string) error {
var err error
logrus.Debugf("creating user %s for db %s", username, dbName)
// If the password is empty, pass false to the password parameter
if password == "" {
err = gorethink.DB("rethinkdb").Table("users").Insert(map[string]interface{}{
"id": username,
"password": false,
}).Exec(session)
} else {
err = gorethink.DB("rethinkdb").Table("users").Insert(map[string]string{
"id": username,
"password": password,
}).Exec(session)
}
if err != nil {
return fmt.Errorf("unable to add user %s to rethinkdb users table: %s", username, err)
}
// Grant read and write permission
return gorethink.DB(dbName).Grant(username, map[string]bool{
"read": true,
"write": true,
}).Exec(session)
}