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redshift.go
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redshift.go
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package rin
import (
"context"
"database/sql"
"log"
"strings"
"sync"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/redshift"
_ "github.com/lib/pq"
_ "github.com/mashiike/redshift-data-sql-driver"
)
var (
DBPool = make(map[string]*sql.DB, 0)
DBPoolMutex sync.Mutex
redshiftSvc *redshift.Client
)
func BoolValue(b *bool) bool {
if b != nil {
return *b
}
return false
}
func Import(ctx context.Context, event Event) (int, error) {
var processed int
for _, record := range event.Records {
TARGETS:
for _, target := range config.Targets {
if ok, cap := target.MatchEventRecord(record); ok {
if target.Discard {
processed++
break TARGETS
}
err := target.ImportRedshift(ctx, record, cap)
if err != nil {
if BoolValue(config.Redshift.ReconnectOnError) {
target.DisconnectToRedshift()
}
return processed, err
} else {
processed++
}
if target.Break {
break TARGETS
}
}
}
}
return processed, nil
}
func (target *Target) DisconnectToRedshift() {
r := target.Redshift
dsn := r.DSN()
log.Println("[info] Disconnect to Redshift", r.VisibleDSN())
DBPoolMutex.Lock()
defer DBPoolMutex.Unlock()
if db := DBPool[dsn]; db != nil {
db.Close()
}
delete(DBPool, dsn)
}
func (target *Target) ConnectToRedshift(ctx context.Context) (*sql.DB, error) {
r := target.Redshift
dsn := r.DSN()
DBPoolMutex.Lock()
defer DBPoolMutex.Unlock()
if db := DBPool[dsn]; db != nil {
if db.Ping() == nil {
return db, nil
} else {
delete(DBPool, dsn)
}
}
log.Println("[info] Connect to Redshift", r.VisibleDSN())
var user, password = r.User, r.Password
// redshift-data driver creates a temporary credentials by itself
if password == "" && r.Driver != DriverRedshiftData {
if redshiftSvc == nil {
redshiftSvc = redshift.NewFromConfig(*Sessions.Redshift, Sessions.RedshiftOptFns...)
}
id := strings.SplitN(r.Host, ".", 2)[0]
log.Printf("[info] Getting cluster credentials for %s user %s", r.Host, r.User)
res, err := redshiftSvc.GetClusterCredentials(ctx, &redshift.GetClusterCredentialsInput{
ClusterIdentifier: aws.String(id),
DbUser: aws.String(r.User),
})
if err != nil {
return nil, err
}
user, password = *res.DbUser, *res.DbPassword
log.Printf("[debug] Got user %s password %s", user, password)
}
db, err := sql.Open(r.Driver, r.DSNWith(user, password))
if err != nil {
return nil, err
}
DBPool[dsn] = db
return db, nil
}
func (target *Target) ImportRedshift(ctx context.Context, record *EventRecord, cap *[]string) error {
if config.Redshift.UseTransaction() {
return target.importRedshiftWithTx(ctx, record, cap)
} else {
return target.importRedshiftWithoutTx(ctx, record, cap)
}
}
func (target *Target) importRedshiftWithTx(ctx context.Context, record *EventRecord, cap *[]string) error {
log.Printf("[info] Import to target %s from record %s", target, record)
db, err := target.ConnectToRedshift(ctx)
if err != nil {
return err
}
txn, err := db.Begin()
if err != nil {
return err
}
defer txn.Rollback()
query, err := target.BuildCopySQL(record.S3.Object.Key, config.Credentials, cap)
if err != nil {
return err
}
log.Println("[debug] SQL:", query)
stmt, err := txn.Prepare(query)
if err != nil {
return err
}
defer stmt.Close()
_, err = stmt.Exec()
if err != nil {
return err
}
err = txn.Commit()
if err != nil {
return err
}
return nil
}
func (target *Target) importRedshiftWithoutTx(ctx context.Context, record *EventRecord, cap *[]string) error {
log.Printf("[info] Import to target %s from record %s", target, record)
db, err := target.ConnectToRedshift(ctx)
if err != nil {
return err
}
query, err := target.BuildCopySQL(record.S3.Object.Key, config.Credentials, cap)
if err != nil {
return err
}
log.Println("[debug] SQL:", query)
if _, err := db.Exec(query); err != nil {
return err
}
return nil
}