79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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// Package pgutil contains utilities for postgres
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package pgutil
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import (
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"database/sql"
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"encoding/hex"
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"math/rand"
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"net/url"
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"strconv"
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"strings"
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)
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// CreateRandomTestingSchemaName creates a random schema name string.
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func CreateRandomTestingSchemaName(n int) string {
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data := make([]byte, n)
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// math/rand.Read() always returns a nil error so there's no need to handle the error.
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_, _ = rand.Read(data)
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return hex.EncodeToString(data)
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}
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// ConnstrWithSchema adds schema to a connection string
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func ConnstrWithSchema(connstr, schema string) string {
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schema = strings.ToLower(schema)
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return connstr + "&search_path=" + url.QueryEscape(schema)
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}
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// ParseSchemaFromConnstr returns the name of the schema parsed from the
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// connection string if one is provided
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func ParseSchemaFromConnstr(connstr string) (string, error) {
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url, err := url.Parse(connstr)
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if err != nil {
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return "", err
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}
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queryValues := url.Query()
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schema := queryValues["search_path"]
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if len(schema) > 0 {
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return schema[0], nil
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}
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return "", nil
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}
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// QuoteSchema quotes schema name for
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func QuoteSchema(schema string) string {
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return strconv.QuoteToASCII(schema)
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}
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// Execer is for executing sql
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type Execer interface {
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Exec(query string, args ...interface{}) (sql.Result, error)
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}
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// CreateSchema creates a schema if it doesn't exist.
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func CreateSchema(db Execer, schema string) (err error) {
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for try := 0; try < 5; try++ {
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_, err = db.Exec(`create schema if not exists ` + QuoteSchema(schema) + `;`)
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// Postgres `CREATE SCHEMA IF NOT EXISTS` may return "duplicate key value violates unique constraint".
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// In that case, we will retry rather than doing anything more complicated.
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//
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// See more in: https://stackoverflow.com/a/29908840/192220
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if IsConstraintError(err) {
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continue
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}
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return err
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}
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return err
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}
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// DropSchema drops the named schema
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func DropSchema(db Execer, schema string) error {
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_, err := db.Exec(`drop schema ` + QuoteSchema(schema) + ` cascade;`)
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return err
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}
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