mirror of
https://github.com/neilotoole/sq.git
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3180334c0c
* refactor: partially moved over driver.Tuning params to options * All knobs moved to options * sq config edit: now has comments for options * Major work complete on config/options overhaul * Major work complete on config/options overhaul * Updated help text for 'sq version'
609 lines
16 KiB
Go
609 lines
16 KiB
Go
// Package postgres implements the sq driver for postgres.
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package postgres
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"github.com/neilotoole/sq/libsq/core/options"
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"github.com/jackc/pgx/v5/pgconn"
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"github.com/neilotoole/sq/libsq/core/retry"
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"github.com/jackc/pgx/v5/stdlib"
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"github.com/jackc/pgx/v5/pgxpool"
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"github.com/jackc/pgx/v5"
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"github.com/neilotoole/sq/libsq/driver/dialect"
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"github.com/neilotoole/sq/libsq/core/lg/lga"
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"github.com/neilotoole/sq/libsq/core/lg/lgm"
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"github.com/neilotoole/sq/libsq/core/lg"
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"golang.org/x/exp/slog"
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"github.com/neilotoole/sq/libsq/ast/render"
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"github.com/neilotoole/sq/libsq/core/errz"
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"github.com/neilotoole/sq/libsq/core/kind"
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"github.com/neilotoole/sq/libsq/core/sqlmodel"
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"github.com/neilotoole/sq/libsq/core/sqlz"
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"github.com/neilotoole/sq/libsq/core/stringz"
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"github.com/neilotoole/sq/libsq/driver"
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"github.com/neilotoole/sq/libsq/source"
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)
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const (
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// Type is the postgres source driver type.
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Type = source.DriverType("postgres")
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// dbDrvr is the backing postgres SQL driver impl name.
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dbDrvr = "pgx"
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)
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// Provider is the postgres implementation of driver.Provider.
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type Provider struct {
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Log *slog.Logger
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}
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// DriverFor implements driver.Provider.
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func (p *Provider) DriverFor(typ source.DriverType) (driver.Driver, error) {
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if typ != Type {
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return nil, errz.Errorf("unsupported driver type {%s}", typ)
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}
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return &driveri{log: p.Log}, nil
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}
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// driveri is the postgres implementation of driver.Driver.
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type driveri struct {
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log *slog.Logger
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}
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// DriverMetadata implements driver.Driver.
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func (d *driveri) DriverMetadata() driver.Metadata {
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return driver.Metadata{
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Type: Type,
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Description: "PostgreSQL",
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Doc: "https://github.com/jackc/pgx",
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IsSQL: true,
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}
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}
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// Dialect implements driver.SQLDriver.
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func (d *driveri) Dialect() dialect.Dialect {
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return dialect.Dialect{
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Type: Type,
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Placeholders: placeholders,
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IdentQuote: '"',
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Enquote: stringz.DoubleQuote,
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MaxBatchValues: 1000,
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Ops: dialect.DefaultOps(),
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}
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}
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func placeholders(numCols, numRows int) string {
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rows := make([]string, numRows)
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n := 1
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var sb strings.Builder
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for i := 0; i < numRows; i++ {
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sb.Reset()
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sb.WriteRune('(')
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for j := 1; j <= numCols; j++ {
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sb.WriteRune('$')
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sb.WriteString(strconv.Itoa(n))
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n++
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if j < numCols {
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sb.WriteString(driver.Comma)
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}
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}
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sb.WriteRune(')')
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rows[i] = sb.String()
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}
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return strings.Join(rows, driver.Comma)
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}
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// Renderer implements driver.SQLDriver.
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func (d *driveri) Renderer() *render.Renderer {
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return render.NewDefaultRenderer()
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}
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// Open implements driver.DatabaseOpener.
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func (d *driveri) Open(ctx context.Context, src *source.Source) (driver.Database, error) {
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lg.FromContext(ctx).Debug(lgm.OpenSrc, lga.Src, src)
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db, err := d.doOpen(ctx, src)
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if err != nil {
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return nil, err
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}
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return &database{log: d.log, db: db, src: src, drvr: d}, nil
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}
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func (d *driveri) doOpen(ctx context.Context, src *source.Source) (*sql.DB, error) {
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ctx = options.NewContext(ctx, src.Options)
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dbCfg, err := pgxpool.ParseConfig(src.Location)
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if err != nil {
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return nil, errz.Err(err)
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}
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connStr := stdlib.RegisterConnConfig(dbCfg.ConnConfig)
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var db *sql.DB
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if err := doRetry(ctx, func() error {
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var dbErr error
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db, dbErr = sql.Open(dbDrvr, connStr)
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if dbErr != nil {
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lg.FromContext(ctx).Error("postgres open, may retry", lga.Err, dbErr)
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}
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return dbErr
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}); err != nil {
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return nil, errz.Wrap(err, "failed to open postgres db")
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}
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driver.ConfigureDB(ctx, db, src.Options)
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return db, nil
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}
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// ValidateSource implements driver.Driver.
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func (d *driveri) ValidateSource(src *source.Source) (*source.Source, error) {
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if src.Type != Type {
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return nil, errz.Errorf("expected driver type {%s} but got {%s}", Type, src.Type)
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}
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return src, nil
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}
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// Ping implements driver.Driver.
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func (d *driveri) Ping(ctx context.Context, src *source.Source) error {
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dbase, err := d.Open(ctx, src)
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if err != nil {
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return err
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}
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defer lg.WarnIfCloseError(d.log, lgm.CloseDB, dbase.DB())
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return dbase.DB().Ping()
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}
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// Truncate implements driver.Driver.
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// Note that Truncate makes a separate query to determine the
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// row count of tbl before executing TRUNCATE. This row count
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// query is not part of a transaction with TRUNCATE, although
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// possibly it should be, as the number of rows may have changed.
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func (d *driveri) Truncate(ctx context.Context, src *source.Source, tbl string, reset bool) (affected int64,
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err error,
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) {
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// https://www.postgresql.org/docs/9.1/sql-truncate.html
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// RESTART IDENTITY and CASCADE/RESTRICT are from pg 8.2 onwards
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// FIXME: should first check the pg version for < pg8.2 support
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db, err := d.doOpen(ctx, src)
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if err != nil {
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return affected, errz.Err(err)
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}
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affectedQuery := "SELECT COUNT(*) FROM " + idSanitize(tbl)
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err = db.QueryRowContext(ctx, affectedQuery).Scan(&affected)
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if err != nil {
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return 0, errz.Err(err)
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}
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truncateQuery := "TRUNCATE TABLE " + idSanitize(tbl)
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if reset {
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// if reset & src.DBVersion >= 8.2
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truncateQuery += " RESTART IDENTITY" // default is CONTINUE IDENTITY
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}
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// We could add RESTRICT here; alternative is CASCADE
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_, err = db.ExecContext(ctx, truncateQuery)
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if err != nil {
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return 0, errz.Err(err)
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}
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return affected, nil
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}
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// idSanitize sanitizes an identifier (such as table name). It will
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// add surrounding quotes. For example:
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//
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// table_name --> "table_name"
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func idSanitize(s string) string {
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return pgx.Identifier([]string{s}).Sanitize()
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}
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// CreateTable implements driver.SQLDriver.
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func (d *driveri) CreateTable(ctx context.Context, db sqlz.DB, tblDef *sqlmodel.TableDef) error {
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stmt := buildCreateTableStmt(tblDef)
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_, err := db.ExecContext(ctx, stmt)
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return errz.Err(err)
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}
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// CurrentSchema implements driver.SQLDriver.
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func (d *driveri) CurrentSchema(ctx context.Context, db sqlz.DB) (string, error) {
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var name string
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if err := db.QueryRowContext(ctx, `SELECT CURRENT_SCHEMA()`).Scan(&name); err != nil {
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return "", errz.Err(err)
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}
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return name, nil
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}
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// AlterTableRename implements driver.SQLDriver.
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func (d *driveri) AlterTableRename(ctx context.Context, db sqlz.DB, tbl, newName string) error {
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q := fmt.Sprintf(`ALTER TABLE %q RENAME TO %q`, tbl, newName)
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_, err := db.ExecContext(ctx, q)
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return errz.Wrapf(err, "alter table: failed to rename table {%s} to {%s}", tbl, newName)
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}
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// AlterTableRenameColumn implements driver.SQLDriver.
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func (d *driveri) AlterTableRenameColumn(ctx context.Context, db sqlz.DB, tbl, col, newName string) error {
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q := fmt.Sprintf("ALTER TABLE %q RENAME COLUMN %q TO %q", tbl, col, newName)
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_, err := db.ExecContext(ctx, q)
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return errz.Wrapf(err, "alter table: failed to rename column {%s.%s} to {%s}", tbl, col, newName)
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}
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// AlterTableAddColumn implements driver.SQLDriver.
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func (d *driveri) AlterTableAddColumn(ctx context.Context, db sqlz.DB, tbl, col string, knd kind.Kind) error {
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q := fmt.Sprintf("ALTER TABLE %q ADD COLUMN %q ", tbl, col) + dbTypeNameFromKind(knd)
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_, err := db.ExecContext(ctx, q)
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if err != nil {
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return errz.Wrapf(err, "alter table: failed to add column {%s} to table {%s}", col, tbl)
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}
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return nil
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}
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// PrepareInsertStmt implements driver.SQLDriver.
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func (d *driveri) PrepareInsertStmt(ctx context.Context, db sqlz.DB, destTbl string, destColNames []string,
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numRows int,
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) (*driver.StmtExecer, error) {
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// Note that the pgx driver doesn't support res.LastInsertId.
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// https://github.com/jackc/pgx/issues/411
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destColsMeta, err := d.getTableRecordMeta(ctx, db, destTbl, destColNames)
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if err != nil {
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return nil, err
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}
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stmt, err := driver.PrepareInsertStmt(ctx, d, db, destTbl, destColsMeta.Names(), numRows)
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if err != nil {
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return nil, err
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}
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execer := driver.NewStmtExecer(stmt, driver.DefaultInsertMungeFunc(destTbl, destColsMeta), newStmtExecFunc(stmt),
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destColsMeta)
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return execer, nil
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}
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// PrepareUpdateStmt implements driver.SQLDriver.
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func (d *driveri) PrepareUpdateStmt(ctx context.Context, db sqlz.DB, destTbl string, destColNames []string,
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where string,
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) (*driver.StmtExecer, error) {
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destColsMeta, err := d.getTableRecordMeta(ctx, db, destTbl, destColNames)
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if err != nil {
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return nil, err
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}
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query, err := buildUpdateStmt(destTbl, destColNames, where)
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if err != nil {
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return nil, err
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}
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stmt, err := db.PrepareContext(ctx, query)
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if err != nil {
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return nil, err
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}
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execer := driver.NewStmtExecer(stmt, driver.DefaultInsertMungeFunc(destTbl, destColsMeta), newStmtExecFunc(stmt),
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destColsMeta)
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return execer, nil
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}
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func newStmtExecFunc(stmt *sql.Stmt) driver.StmtExecFunc {
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return func(ctx context.Context, args ...any) (int64, error) {
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res, err := stmt.ExecContext(ctx, args...)
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if err != nil {
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return 0, errz.Err(err)
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}
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affected, err := res.RowsAffected()
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return affected, errz.Err(err)
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}
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}
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// CopyTable implements driver.SQLDriver.
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func (d *driveri) CopyTable(ctx context.Context, db sqlz.DB, fromTable, toTable string, copyData bool) (int64, error) {
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stmt := fmt.Sprintf("CREATE TABLE %q AS TABLE %q", toTable, fromTable)
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if !copyData {
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stmt += " WITH NO DATA"
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}
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affected, err := sqlz.ExecAffected(ctx, db, stmt)
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if err != nil {
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return 0, errz.Err(err)
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}
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return affected, nil
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}
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// TableExists implements driver.SQLDriver.
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func (d *driveri) TableExists(ctx context.Context, db sqlz.DB, tbl string) (bool, error) {
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const query = `SELECT COUNT(*) FROM information_schema.tables
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WHERE table_name = $1`
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var count int64
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err := db.QueryRowContext(ctx, query, tbl).Scan(&count)
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if err != nil {
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return false, errz.Err(err)
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}
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return count == 1, nil
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}
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// DropTable implements driver.SQLDriver.
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func (d *driveri) DropTable(ctx context.Context, db sqlz.DB, tbl string, ifExists bool) error {
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var stmt string
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if ifExists {
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stmt = fmt.Sprintf("DROP TABLE IF EXISTS %q RESTRICT", tbl)
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} else {
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stmt = fmt.Sprintf("DROP TABLE %q RESTRICT", tbl)
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}
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_, err := db.ExecContext(ctx, stmt)
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return errz.Err(err)
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}
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// TableColumnTypes implements driver.SQLDriver.
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func (d *driveri) TableColumnTypes(ctx context.Context, db sqlz.DB, tblName string,
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colNames []string,
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) ([]*sql.ColumnType, error) {
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// We have to do some funky stuff to get the column types
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// from when the table has no rows.
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// https://stackoverflow.com/questions/8098795/return-a-value-if-no-record-is-found
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// If tblName is "person" and we want cols "username"
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// and "email", the query will look like:
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//
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// SELECT
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// (SELECT username FROM person LIMIT 1) AS username,
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// (SELECT email FROM person LIMIT 1) AS email
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// LIMIT 1;
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quote := string(d.Dialect().IdentQuote)
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tblNameQuoted := stringz.Surround(tblName, quote)
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var query string
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if len(colNames) == 0 {
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// When the table is empty, and colNames are not provided,
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// then we need to fetch the table col names independently.
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var err error
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colNames, err = getTableColumnNames(ctx, db, tblName)
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if err != nil {
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return nil, err
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}
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}
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var sb strings.Builder
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sb.WriteString("SELECT\n")
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for i, colName := range colNames {
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colNameQuoted := stringz.Surround(colName, quote)
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sb.WriteString(fmt.Sprintf(" (SELECT %s FROM %s LIMIT 1) AS %s", colNameQuoted, tblNameQuoted, colNameQuoted))
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if i < len(colNames)-1 {
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sb.WriteRune(',')
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}
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sb.WriteString("\n")
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}
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sb.WriteString("LIMIT 1")
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query = sb.String()
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rows, err := db.QueryContext(ctx, query)
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if err != nil {
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return nil, errz.Err(err)
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}
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colTypes, err := rows.ColumnTypes()
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if err != nil {
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lg.WarnIfFuncError(d.log, lgm.CloseDBRows, rows.Close)
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return nil, errz.Err(err)
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}
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err = rows.Err()
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if err != nil {
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lg.WarnIfFuncError(d.log, lgm.CloseDBRows, rows.Close)
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return nil, errz.Err(err)
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}
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err = rows.Close()
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if err != nil {
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return nil, errz.Err(err)
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}
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return colTypes, nil
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}
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func (d *driveri) getTableRecordMeta(ctx context.Context, db sqlz.DB, tblName string,
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colNames []string,
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) (sqlz.RecordMeta, error) {
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colTypes, err := d.TableColumnTypes(ctx, db, tblName, colNames)
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if err != nil {
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return nil, err
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}
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destCols, _, err := d.RecordMeta(colTypes)
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if err != nil {
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return nil, err
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}
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return destCols, nil
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}
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// getTableColumnNames consults postgres's information_schema.columns table,
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// returning the names of the table's columns in ordinal order.
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func getTableColumnNames(ctx context.Context, db sqlz.DB, tblName string) ([]string, error) {
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log := lg.FromContext(ctx)
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const query = `SELECT column_name FROM information_schema.columns
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WHERE table_schema = CURRENT_SCHEMA()
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AND table_name = $1
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ORDER BY ordinal_position`
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rows, err := db.QueryContext(ctx, query, tblName)
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if err != nil {
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return nil, errz.Err(err)
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}
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var colNames []string
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var colName string
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for rows.Next() {
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err = rows.Scan(&colName)
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if err != nil {
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lg.WarnIfCloseError(log, lgm.CloseDBRows, rows)
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return nil, errz.Err(err)
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}
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colNames = append(colNames, colName)
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}
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if rows.Err() != nil {
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lg.WarnIfCloseError(log, lgm.CloseDBRows, rows)
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return nil, errz.Err(err)
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}
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err = rows.Close()
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if err != nil {
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return nil, errz.Err(err)
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}
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return colNames, nil
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}
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// RecordMeta implements driver.SQLDriver.
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func (d *driveri) RecordMeta(colTypes []*sql.ColumnType) (sqlz.RecordMeta, driver.NewRecordFunc, error) {
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// The jackc/pgx driver doesn't report nullability (sql.ColumnType)
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// Apparently this is due to what postgres sends over the wire.
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// See https://github.com/jackc/pgx/issues/276#issuecomment-526831493
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// So, we'll set the scan type for each column to the nullable
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// version below.
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recMeta := make(sqlz.RecordMeta, len(colTypes))
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for i, colType := range colTypes {
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knd := kindFromDBTypeName(d.log, colType.Name(), colType.DatabaseTypeName())
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colTypeData := sqlz.NewColumnTypeData(colType, knd)
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setScanType(d.log, colTypeData, knd)
|
|
recMeta[i] = sqlz.NewFieldMeta(colTypeData)
|
|
}
|
|
|
|
mungeFn := func(vals []any) (sqlz.Record, error) {
|
|
// postgres doesn't need to do any special munging, so we
|
|
// just use the default munging.
|
|
rec, skipped := driver.NewRecordFromScanRow(recMeta, vals, nil)
|
|
if len(skipped) > 0 {
|
|
var skippedDetails []string
|
|
|
|
for _, skip := range skipped {
|
|
meta := recMeta[skip]
|
|
skippedDetails = append(skippedDetails,
|
|
fmt.Sprintf("[%d] %s: db(%s) --> kind(%s) --> scan(%s)",
|
|
skip, meta.Name(), meta.DatabaseTypeName(), meta.Kind(), meta.ScanType()))
|
|
}
|
|
|
|
return nil, errz.Errorf("expected zero skipped cols but have %d:\n %s",
|
|
skipped, strings.Join(skippedDetails, "\n "))
|
|
}
|
|
return rec, nil
|
|
}
|
|
|
|
return recMeta, mungeFn, nil
|
|
}
|
|
|
|
// database is the postgres implementation of driver.Database.
|
|
type database struct {
|
|
log *slog.Logger
|
|
drvr *driveri
|
|
db *sql.DB
|
|
src *source.Source
|
|
}
|
|
|
|
// DB implements driver.Database.
|
|
func (d *database) DB() *sql.DB {
|
|
return d.db
|
|
}
|
|
|
|
// SQLDriver implements driver.Database.
|
|
func (d *database) SQLDriver() driver.SQLDriver {
|
|
return d.drvr
|
|
}
|
|
|
|
// Source implements driver.Database.
|
|
func (d *database) Source() *source.Source {
|
|
return d.src
|
|
}
|
|
|
|
// TableMetadata implements driver.Database.
|
|
func (d *database) TableMetadata(ctx context.Context, tblName string) (*source.TableMetadata, error) {
|
|
return getTableMetadata(ctx, d.DB(), tblName)
|
|
}
|
|
|
|
// SourceMetadata implements driver.Database.
|
|
func (d *database) SourceMetadata(ctx context.Context) (*source.Metadata, error) {
|
|
return getSourceMetadata(ctx, d.src, d.DB())
|
|
}
|
|
|
|
// Close implements driver.Database.
|
|
func (d *database) Close() error {
|
|
d.log.Debug(lgm.CloseDB, lga.Handle, d.src.Handle)
|
|
|
|
err := d.db.Close()
|
|
if err != nil {
|
|
return errz.Err(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
const (
|
|
errCodeRelationNotExist = "42P01"
|
|
errCodeTooManyConnections = "53300"
|
|
)
|
|
|
|
// isErrTooManyConnections returns true if err is a postgres error
|
|
// with code 53300 (too_many_connections).
|
|
//
|
|
// See: https://www.postgresql.org/docs/14/errcodes-appendix.html
|
|
func isErrTooManyConnections(err error) bool {
|
|
return hasErrCode(err, errCodeTooManyConnections)
|
|
}
|
|
|
|
// hasErrCode returns true if err (or its cause error)
|
|
// is of type *pgconn.PgError and err.Number equals code.
|
|
// See: isErrTooManyConnections.
|
|
func hasErrCode(err error, code string) bool {
|
|
if err == nil {
|
|
return false
|
|
}
|
|
var pgErr *pgconn.PgError
|
|
|
|
if errors.As(err, &pgErr) {
|
|
return pgErr.Code == code
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// doRetry executes fn with retry on isErrTooManyConnections.
|
|
func doRetry(ctx context.Context, fn func() error) error {
|
|
maxRetryInterval := driver.OptMaxRetryInterval.Get(options.FromContext(ctx))
|
|
return retry.Do(ctx, maxRetryInterval, fn, isErrTooManyConnections)
|
|
}
|