/
postgres.go
163 lines (155 loc) · 4.89 KB
/
postgres.go
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// Package postgres defines and registers usql's PostgreSQL driver.
//
// Alias: cockroachdb, CockroachDB
// Alias: redshift, Amazon Redshift
//
// See: https://github.com/lib/pq
// Group: base
package postgres
import (
"context"
"database/sql"
"fmt"
"io"
"strings"
"github.com/lib/pq" // DRIVER
"github.com/xo/dburl"
"github.com/xo/usql/drivers"
"github.com/xo/usql/drivers/metadata"
pgmeta "github.com/xo/usql/drivers/metadata/postgres"
"github.com/xo/usql/text"
)
func init() {
drivers.Register("postgres", drivers.Driver{
Name: "pq",
AllowDollar: true,
AllowMultilineComments: true,
LexerName: "postgres",
ForceParams: func(u *dburl.URL) {
if u.Scheme == "cockroachdb" {
drivers.ForceQueryParameters([]string{"sslmode", "disable"})(u)
}
},
Open: func(u *dburl.URL, stdout, stderr func() io.Writer) (func(string, string) (*sql.DB, error), error) {
return func(typ, dsn string) (*sql.DB, error) {
conn, err := pq.NewConnector(dsn)
if err != nil {
return nil, err
}
noticeConn := pq.ConnectorWithNoticeHandler(conn, func(notice *pq.Error) {
out := stderr()
fmt.Fprintln(out, notice.Severity+": ", notice.Message)
if notice.Hint != "" {
fmt.Fprintln(out, "HINT: ", notice.Hint)
}
})
notificationConn := pq.ConnectorWithNotificationHandler(noticeConn, func(notification *pq.Notification) {
var payload string
if notification.Extra != "" {
payload = fmt.Sprintf(text.NotificationPayload, notification.Extra)
}
fmt.Fprintln(stdout(), fmt.Sprintf(text.NotificationReceived, notification.Channel, payload, notification.BePid))
})
return sql.OpenDB(notificationConn), nil
}, nil
},
Version: func(ctx context.Context, db drivers.DB) (string, error) {
// numeric version
// SHOW server_version_num;
var ver string
err := db.QueryRowContext(ctx, `SHOW server_version`).Scan(&ver)
if err != nil {
return "", err
}
return "PostgreSQL " + ver, nil
},
ChangePassword: func(db drivers.DB, user, newpw, _ string) error {
_, err := db.Exec(`ALTER USER ` + user + ` PASSWORD '` + newpw + `'`)
return err
},
Err: func(err error) (string, string) {
if e, ok := err.(*pq.Error); ok {
return string(e.Code), e.Message
}
return "", err.Error()
},
IsPasswordErr: func(err error) bool {
if e, ok := err.(*pq.Error); ok {
return e.Code.Name() == "invalid_password"
}
return false
},
NewMetadataReader: pgmeta.NewReader(),
NewMetadataWriter: func(db drivers.DB, w io.Writer, opts ...metadata.ReaderOption) metadata.Writer {
return metadata.NewDefaultWriter(pgmeta.NewReader()(db, opts...))(db, w)
},
Copy: func(ctx context.Context, db *sql.DB, rows *sql.Rows, table string) (int64, error) {
columns, err := rows.Columns()
if err != nil {
return 0, fmt.Errorf("failed to fetch source rows columns: %w", err)
}
clen := len(columns)
query := table
if !strings.HasPrefix(strings.ToLower(query), "insert into") {
leftParen := strings.IndexRune(table, '(')
colQuery := "SELECT * FROM " + table + " WHERE 1=0"
if leftParen != -1 {
colQuery = "SELECT " + table[leftParen+1:len(table)-1] + " FROM " + table[:leftParen] + " WHERE 1=0"
table = table[:leftParen]
}
colStmt, err := db.PrepareContext(ctx, colQuery)
if err != nil {
return 0, fmt.Errorf("failed to prepare query to determine target table columns: %w", err)
}
defer colStmt.Close()
colRows, err := colStmt.QueryContext(ctx)
if err != nil {
return 0, fmt.Errorf("failed to execute query to determine target table columns: %w", err)
}
columns, err := colRows.Columns()
if err != nil {
return 0, fmt.Errorf("failed to fetch target table columns: %w", err)
}
query = pq.CopyIn(table, columns...)
}
tx, err := db.BeginTx(ctx, nil)
if err != nil {
return 0, fmt.Errorf("failed to begin transaction: %w", err)
}
stmt, err := tx.PrepareContext(ctx, query)
if err != nil {
return 0, fmt.Errorf("failed to prepare insert query: %w", err)
}
defer stmt.Close()
values := make([]interface{}, clen)
for i := 0; i < clen; i++ {
values[i] = new(interface{})
}
var n int64
for rows.Next() {
err = rows.Scan(values...)
if err != nil {
return n, fmt.Errorf("failed to scan row: %w", err)
}
_, err := stmt.ExecContext(ctx, values...)
if err != nil {
return n, fmt.Errorf("failed to exec copy: %w", err)
}
}
res, err := stmt.ExecContext(ctx)
if err != nil {
return n, fmt.Errorf("failed to final exec copy: %w", err)
}
rn, err := res.RowsAffected()
if err != nil {
return n, fmt.Errorf("failed to check rows affected: %w", err)
}
n += rn
err = tx.Commit()
if err != nil {
return n, fmt.Errorf("failed to commit transaction: %w", err)
}
return n, rows.Err()
},
}, "cockroachdb", "redshift")
}