本文整理汇总了Golang中gopkg/in/inf/v0.Dec.Sub方法的典型用法代码示例。如果您正苦于以下问题：Golang Dec.Sub方法的具体用法？Golang Dec.Sub怎么用？Golang Dec.Sub使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类gopkg/in/inf/v0.Dec的用法示例。
在下文中一共展示了Dec.Sub方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: TestAsOfRetry
// Test that a TransactionRetryError will retry the read until it succeeds. The
// test is designed so that if the proto timestamps are bumped during retry
// a failure will occur.
func TestAsOfRetry(t *testing.T) {
defer leaktest.AfterTest(t)()
params, cmdFilters := createTestServerParams()
// Disable one phase commits because they cannot be restarted.
params.Knobs.Store.(*storage.StoreTestingKnobs).DisableOnePhaseCommits = true
s, sqlDB, _ := serverutils.StartServer(t, params)
defer s.Stopper().Stop()
const val1 = 1
const val2 = 2
const name = "boulanger"
if _, err := sqlDB.Exec(`
CREATE DATABASE d;
CREATE TABLE d.t (s STRING PRIMARY KEY, a INT);
`); err != nil {
t.Fatal(err)
}
var tsStart string
if err := sqlDB.QueryRow(`
INSERT INTO d.t (s, a) VALUES ($1, $2)
RETURNING cluster_logical_timestamp();
`, name, val1).Scan(&tsStart); err != nil {
t.Fatal(err)
}
var tsVal2 string
if err := sqlDB.QueryRow("UPDATE d.t SET a = $1 RETURNING cluster_logical_timestamp()", val2).Scan(&tsVal2); err != nil {
t.Fatal(err)
}
walltime := new(inf.Dec)
if _, ok := walltime.SetString(tsVal2); !ok {
t.Fatalf("couldn't set decimal: %s", tsVal2)
}
oneTick := inf.NewDec(1, 0)
// Set tsVal1 to 1ns before tsVal2.
tsVal1 := walltime.Sub(walltime, oneTick).String()
// Set up error injection that causes retries.
magicVals := createFilterVals(nil, nil)
magicVals.restartCounts = map[string]int{
name: 5,
}
cleanupFilter := cmdFilters.AppendFilter(
func(args storagebase.FilterArgs) *roachpb.Error {
magicVals.Lock()
defer magicVals.Unlock()
switch req := args.Req.(type) {
case *roachpb.ScanRequest:
for key, count := range magicVals.restartCounts {
if err := checkCorrectTxn(string(req.Key), magicVals, args.Hdr.Txn); err != nil {
return roachpb.NewError(err)
}
if count > 0 && bytes.Contains(req.Key, []byte(key)) {
magicVals.restartCounts[key]--
err := roachpb.NewTransactionRetryError()
magicVals.failedValues[string(req.Key)] =
failureRecord{err, args.Hdr.Txn}
txn := args.Hdr.Txn.Clone()
txn.Timestamp = txn.Timestamp.Add(0, 1)
return roachpb.NewErrorWithTxn(err, &txn)
}
}
}
return nil
}, false)
var i int
// Query with tsVal1 which should return the first value. Since tsVal1 is just
// one nanosecond before tsVal2, any proto timestamp bumping will return val2
// and error.
// Must specify the WHERE here to trigger the injection errors.
if err := sqlDB.QueryRow(fmt.Sprintf("SELECT a FROM d.t AS OF SYSTEM TIME %s WHERE s = '%s'", tsVal1, name)).Scan(&i); err != nil {
t.Fatal(err)
} else if i != val1 {
t.Fatalf("unexpected val: %v", i)
}
cleanupFilter()
// Verify that the retry errors were injected.
checkRestarts(t, magicVals)
// Query with tsVal2 to ensure val2 is indeed present.
if err := sqlDB.QueryRow(fmt.Sprintf("SELECT a FROM d.t AS OF SYSTEM TIME %s", tsVal2)).Scan(&i); err != nil {
t.Fatal(err)
} else if i != val2 {
t.Fatalf("unexpected val: %v", i)
}
}