vendor: revendor

vendor/github.com/cockroachdb/cockroach-go/crdb/tx_test.go

@@ -1,125 +0,0 @@
-// Copyright 2016 The Cockroach Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-// implied. See the License for the specific language governing
-// permissions and limitations under the License.
-//
-// Author: Spencer Kimball (spencer@cockroachlabs.com)
-
-package crdb
-
-import (
-	"database/sql"
-	"fmt"
-	"sync"
-	"testing"
-
-	"github.com/cockroachdb/cockroach-go/testserver"
-)
-
-// TestExecuteTx verifies transaction retry using the classic
-// example of write skew in bank account balance transfers.
-func TestExecuteTx(t *testing.T) {
-	db, stop := testserver.NewDBForTest(t)
-	defer stop()
-
-	initStmt := `
-CREATE DATABASE d;
-CREATE TABLE d.t (acct INT PRIMARY KEY, balance INT);
-INSERT INTO d.t (acct, balance) VALUES (1, 100), (2, 100);
-`
-	if _, err := db.Exec(initStmt); err != nil {
-		t.Fatal(err)
-	}
-
-	type queryI interface {
-		Query(string, ...interface{}) (*sql.Rows, error)
-	}
-
-	getBalances := func(q queryI) (bal1, bal2 int, err error) {
-		var rows *sql.Rows
-		rows, err = q.Query(`SELECT balance FROM d.t WHERE acct IN (1, 2);`)
-		if err != nil {
-			return
-		}
-		defer rows.Close()
-		balances := []*int{&bal1, &bal2}
-		i := 0
-		for ; rows.Next(); i += 1 {
-			if err = rows.Scan(balances[i]); err != nil {
-				return
-			}
-		}
-		if i != 2 {
-			err = fmt.Errorf("expected two balances; got %d", i)
-			return
-		}
-		return
-	}
-
-	runTxn := func(wg *sync.WaitGroup, iter *int) <-chan error {
-		errCh := make(chan error, 1)
-		go func() {
-			*iter = 0
-			errCh <- ExecuteTx(db, func(tx *sql.Tx) error {
-				*iter++
-				bal1, bal2, err := getBalances(tx)
-				if err != nil {
-					return err
-				}
-				// If this is the first iteration, wait for the other tx to also read.
-				if *iter == 1 {
-					wg.Done()
-					wg.Wait()
-				}
-				// Now, subtract from one account and give to the other.
-				if bal1 > bal2 {
-					if _, err := tx.Exec(`
-UPDATE d.t SET balance=balance-100 WHERE acct=1;
-UPDATE d.t SET balance=balance+100 WHERE acct=2;
-`); err != nil {
-						return err
-					}
-				} else {
-					if _, err := tx.Exec(`
-UPDATE d.t SET balance=balance+100 WHERE acct=1;
-UPDATE d.t SET balance=balance-100 WHERE acct=2;
-`); err != nil {
-						return err
-					}
-				}
-				return nil
-			})
-		}()
-		return errCh
-	}
-
-	var wg sync.WaitGroup
-	wg.Add(2)
-	var iters1, iters2 int
-	txn1Err := runTxn(&wg, &iters1)
-	txn2Err := runTxn(&wg, &iters2)
-	if err := <-txn1Err; err != nil {
-		t.Errorf("expected success in txn1; got %s", err)
-	}
-	if err := <-txn2Err; err != nil {
-		t.Errorf("expected success in txn2; got %s", err)
-	}
-	if iters1+iters2 <= 2 {
-		t.Errorf("expected at least one retry between the competing transactions; "+
-			"got txn1=%d, txn2=%d", iters1, iters2)
-	}
-	bal1, bal2, err := getBalances(db)
-	if err != nil || bal1 != 100 || bal2 != 100 {
-		t.Errorf("expected balances to be restored without error; "+
-			"got acct1=%d, acct2=%d: %s", bal1, bal2, err)
-	}
-}