Golang roachpb.MakeKey函數代碼示例

func TestValidateRangeMetaKey(t *testing.T) {
	defer leaktest.AfterTest(t)
	testCases := []struct {
		key    []byte
		expErr bool
	}{
		{roachpb.RKeyMin, false},
		{roachpb.RKey("\x00"), true},
		{Meta1Prefix, false},
		{roachpb.MakeKey(Meta1Prefix, roachpb.RKeyMax), false},
		{roachpb.MakeKey(Meta2Prefix, roachpb.RKeyMax), false},
		{roachpb.MakeKey(Meta2Prefix, roachpb.RKeyMax.Next()), true},
	}
	for i, test := range testCases {
		err := validateRangeMetaKey(test.key)
		if err != nil != test.expErr {
			t.Errorf("%d: expected error? %t: %s", i, test.expErr, err)
		}
	}
}

// TestBootstrapCluster verifies the results of bootstrapping a
// cluster. Uses an in memory engine.
func TestBootstrapCluster(t *testing.T) {
	defer leaktest.AfterTest(t)
	stopper := stop.NewStopper()
	e := engine.NewInMem(roachpb.Attributes{}, 1<<20, stopper)
	localDB, err := BootstrapCluster("cluster-1", []engine.Engine{e}, stopper)
	if err != nil {
		t.Fatal(err)
	}
	defer stopper.Stop()

	// Scan the complete contents of the local database.
	rows, err := localDB.Scan(keys.LocalMax, roachpb.KeyMax, 0)
	if err != nil {
		t.Fatal(err)
	}
	var foundKeys keySlice
	for _, kv := range rows {
		foundKeys = append(foundKeys, kv.Key)
	}
	var expectedKeys = keySlice{
		roachpb.MakeKey(roachpb.Key("\x02"), roachpb.KeyMax),
		roachpb.MakeKey(roachpb.Key("\x03"), roachpb.KeyMax),
		roachpb.Key("\x04node-idgen"),
		roachpb.Key("\x04range-tree-root"),
		roachpb.Key("\x04store-idgen"),
	}
	// Add the initial keys for sql.
	for _, kv := range sql.MakeMetadataSchema().GetInitialValues() {
		expectedKeys = append(expectedKeys, kv.Key)
	}
	// Resort the list. The sql values are not sorted.
	sort.Sort(expectedKeys)

	if !reflect.DeepEqual(foundKeys, expectedKeys) {
		t.Errorf("expected keys mismatch:\n%s\n  -- vs. -- \n\n%s",
			formatKeys(foundKeys), formatKeys(expectedKeys))
	}

	// TODO(spencer): check values.
}

func TestPrettyPrint(t *testing.T) {
	defer leaktest.AfterTest(t)

	tm, _ := time.Parse(time.UnixDate, "Sat Mar  7 11:06:39 UTC 2015")

	testCases := []struct {
		key roachpb.Key
		exp string
	}{
		// local
		{StoreIdentKey(), "/Local/Store/storeIdent"},
		{StoreGossipKey(), "/Local/Store/gossipBootstrap"},
		{SequenceCacheKeyPrefix(roachpb.RangeID(1000001), []byte("test0")), `/Local/RangeID/1000001/SequenceCache/"test0"`},
		{SequenceCacheKey(roachpb.RangeID(1000001), []byte("test0"), uint32(111), uint32(222)), `/Local/RangeID/1000001/SequenceCache/"test0"/epoch:111/seq:222`},
		{RaftLeaderLeaseKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RaftLeaderLease"},
		{RaftTombstoneKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RaftTombstone"},
		{RaftHardStateKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RaftHardState"},
		{RaftAppliedIndexKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RaftAppliedIndex"},
		{RaftLogKey(roachpb.RangeID(1000001), uint64(200001)), "/Local/RangeID/1000001/RaftLog/logIndex:200001"},
		{RaftTruncatedStateKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RaftTruncatedState"},
		{RaftLastIndexKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RaftLastIndex"},
		{RangeLastVerificationTimestampKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RangeLastVerificationTimestamp"},
		{RangeStatsKey(roachpb.RangeID(1000001)), "/Local/RangeID/1000001/RangeStats"},

		{MakeRangeKeyPrefix(roachpb.RKey("ok")), `/Local/Range/"ok"`},
		{RangeDescriptorKey(roachpb.RKey("111")), `/Local/Range/RangeDescriptor/"111"`},
		{RangeTreeNodeKey(roachpb.RKey("111")), `/Local/Range/RangeTreeNode/"111"`},
		{TransactionKey(roachpb.Key("111"), []byte("22222")), `/Local/Range/Transaction/addrKey:/"111"/id:"22222"`},

		{LocalMax, "/Local/Max"},

		// system
		{roachpb.MakeKey(Meta2Prefix, roachpb.Key("foo")), `/Meta2/"foo"`},
		{roachpb.MakeKey(Meta1Prefix, roachpb.Key("foo")), `/Meta1/"foo"`},

		{StoreStatusKey(2222), "/System/StatusStore/2222"},
		{NodeStatusKey(1111), "/System/StatusNode/1111"},

		{SystemMax, "/System/Max"},

		// table
		{UserTableDataMin, "/Table/50"},
		{MakeTablePrefix(111), "/Table/111"},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey("foo")), `/Table/42/"foo"`},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeFloat(nil, float64(233.221112)))), "/Table/42/233.221112"},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeVarint(nil, 1222)), roachpb.RKey(encoding.EncodeString(nil, "handsome man"))), `/Table/42/1222/"handsome man"`},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeBytes(nil, []byte{1, 2, 8, 255}))), `/Table/42/"\x01\x02\b\xff"`},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeBytes(nil, []byte{1, 2, 8, 255})), roachpb.RKey("bar")), `/Table/42/"\x01\x02\b\xff"/"bar"`},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeNull(nil))), "/Table/42/NULL"},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeNotNull(nil))), "/Table/42/#"},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey(encoding.EncodeTime(nil, tm))), "/Table/42/Sat Mar  7 11:06:39 UTC 2015"},

		// others
		{MakeKey([]byte("")), "/Min"},
		{MakeKey(MakeTablePrefix(42), roachpb.RKey([]byte{0x20, 'a', 0x00, 0x02})), "/Table/42/<util/encoding/encoding.go:407: unknown escape>"},
	}
	for i, test := range testCases {
		keyInfo := PrettyPrint(test.key)
		if test.exp != keyInfo {
			t.Fatalf("%d: expected %s, got %s", i, test.exp, keyInfo)
		}

		if test.exp != test.key.String() {
			t.Fatalf("%d: expected %s, got %s", i, test.exp, keyInfo)
		}
	}
}

//
// The resolution refers to the sample duration at which data is stored.
// Cockroach supports a fixed set of named resolutions, which are stored in the
// Resolution enumeration. This value is encoded as a VarInt in the key.
//
// Cockroach divides all data for a series into contiguous "time slots" of
// uniform length based on the "key duration" of the Resolution. For each
// series/source pair, there will be one key per slot. Slot 0 begins at unix
// epoch; the slot for a specific timestamp is found by truncating the
// timestamp to an exact multiple of the key duration, and then dividing it by
// the key duration:
//
// 		slot := (timestamp / keyDuration) // integer division
var (
	// keyDataPrefix is the key prefix for time series data keys.
	keyDataPrefix = roachpb.MakeKey(keys.SystemPrefix, roachpb.Key("tsd"))
)

// MakeDataKey creates a time series data key for the given series name, source,
// Resolution and timestamp. The timestamp is expressed in nanoseconds since the
// epoch; it will be truncated to an exact multiple of the supplied
// Resolution's KeyDuration.
func MakeDataKey(name string, source string, r Resolution, timestamp int64) roachpb.Key {
	// Normalize timestamp into a timeslot before recording.
	timeslot := timestamp / r.KeyDuration()

	k := append(roachpb.Key(nil), keyDataPrefix...)
	k = encoding.EncodeBytes(k, []byte(name))
	k = encoding.EncodeVarint(k, int64(r))
	k = encoding.EncodeVarint(k, timeslot)
	k = append(k, source...)

// MakeKey makes a new key which is the concatenation of the
// given inputs, in order.
func MakeKey(keys ...[]byte) []byte {
	return roachpb.MakeKey(keys...)
}

func TestMetaReverseScanBounds(t *testing.T) {
	defer leaktest.AfterTest(t)

	testCases := []struct {
		key              []byte
		expStart, expEnd []byte
		expError         string
	}{
		{
			key:      roachpb.RKey{},
			expStart: nil,
			expEnd:   nil,
			expError: "KeyMin and Meta1Prefix can't be used as the key of reverse scan",
		},
		{
			key:      Meta1Prefix,
			expStart: nil,
			expEnd:   nil,
			expError: "KeyMin and Meta1Prefix can't be used as the key of reverse scan",
		},
		{
			key:      Meta2KeyMax.Next(),
			expStart: nil,
			expEnd:   nil,
			expError: "body of meta key range lookup is",
		},
		{
			key:      Meta1KeyMax.Next(),
			expStart: nil,
			expEnd:   nil,
			expError: "body of meta key range lookup is",
		},
		{
			key:      roachpb.MakeKey(Meta2Prefix, roachpb.Key("foo")),
			expStart: Meta2Prefix,
			expEnd:   roachpb.MakeKey(Meta2Prefix, roachpb.Key("foo\x00")),
			expError: "",
		},
		{
			key:      roachpb.MakeKey(Meta1Prefix, roachpb.Key("foo")),
			expStart: Meta1Prefix,
			expEnd:   roachpb.MakeKey(Meta1Prefix, roachpb.Key("foo\x00")),
			expError: "",
		},
		{
			key:      Addr(Meta2Prefix),
			expStart: Meta1Prefix,
			expEnd:   Meta2Prefix.Next(),
			expError: "",
		},
		{
			key:      Meta2KeyMax,
			expStart: Meta2Prefix,
			expEnd:   Meta2KeyMax.Next(),
			expError: "",
		},
	}
	for i, test := range testCases {
		resStart, resEnd, err := MetaReverseScanBounds(roachpb.RKey(test.key))

		if err != nil && !testutils.IsError(err, test.expError) {
			t.Errorf("expected error: %s ; got %s", test.expError, err)
		} else if err == nil && test.expError != "" {
			t.Errorf("expected error: %s", test.expError)
		}

		if !resStart.Equal(test.expStart) || !resEnd.Equal(test.expEnd) {
			t.Errorf("%d: range bounds %q-%q don't match expected bounds %q-%q for key %q", i, resStart, resEnd, test.expStart, test.expEnd, test.key)
		}
	}
}

// MakeKey makes a new key which is the concatenation of the
// given inputs, in order.
func MakeKey(keys ...roachpb.Key) roachpb.Key {
	return roachpb.MakeKey(keys...)
}