datetime: sync datetime range with Tarantool

The patch adds check for supported Datetime values. The supported range
comes from Tarantool implementation [1] and c-dt library [2].

1. https://github.com/tarantool/tarantool/blob/a99ccce5f517d2a04670289d3d09a8cc2f5916f9/src/lib/core/datetime.h#L44-L61
2. https://github.com/tarantool/c-dt/blob/e6214325fe8d4336464ebae859ac2b456fd22b77/API.pod#introduction

Closes #191

Author: oleg-jukovec

datetime/datetime.go

@@ -67,18 +67,33 @@ const (
 	tzOffsetSize = 2
 )
 
+// Limits are from c-dt library:
+// https://github.com/tarantool/c-dt/blob/e6214325fe8d4336464ebae859ac2b456fd22b77/API.pod#introduction
+// https://github.com/tarantool/tarantool/blob/a99ccce5f517d2a04670289d3d09a8cc2f5916f9/src/lib/core/datetime.h#L44-L61
+const (
+	minSeconds = -185604722870400
+	maxSeconds = 185480451417600
+)
+
 const maxSize = secondsSize + nsecSize + tzIndexSize + tzOffsetSize
 
 type Datetime struct {
 	time time.Time
 }
 
 // NewDatetime returns a pointer to a new datetime.Datetime that contains a
-// specified time.Time.
-func NewDatetime(t time.Time) *Datetime {
+// specified time.Time. It may returns an error if the Time value is out of
+// supported range: [-5879610-06-22T00:00Z .. 5879611-07-11T00:00Z]
+func NewDatetime(t time.Time) (*Datetime, error) {
+	seconds := t.Unix()
+
+	if seconds < minSeconds || seconds > maxSeconds {
+		return nil, fmt.Errorf("Time %s is out of supported range.", t)
+	}
+
 	dt := new(Datetime)
 	dt.time = t
-	return dt
+	return dt, nil
 }
 
 // ToTime returns a time.Time that Datetime contains.
@@ -129,10 +144,13 @@ func (tm *Datetime) UnmarshalMsgpack(b []byte) error {
 		dt.tzOffset = int16(binary.LittleEndian.Uint16(b[secondsSize+nsecSize:]))
 		dt.tzIndex = int16(binary.LittleEndian.Uint16(b[secondsSize+nsecSize+tzOffsetSize:]))
 	}
-	tt := time.Unix(dt.seconds, int64(dt.nsec)).UTC()
-	*tm = *NewDatetime(tt)
 
-	return nil
+	tt := time.Unix(dt.seconds, int64(dt.nsec)).UTC()
+	dtp, err := NewDatetime(tt)
+	if dtp != nil {
+		*tm = *dtp
+	}
+	return err
 }
 
 func init() {

datetime/datetime_test.go

@@ -15,10 +15,17 @@ import (
 	"gopkg.in/vmihailenco/msgpack.v2"
 )
 
-var (
-	minTime = time.Unix(0, 0)
-	maxTime = time.Unix(1<<63-1, 999999999)
-)
+var maxTimes = []time.Time{
+	time.Date(-5879610, 06, 22, 0, 0, 0, 0, time.UTC),
+	time.Date(5879611, 07, 11, 0, 0, 0, 999999999, time.UTC),
+	time.Date(-5879610, 06, 21, 23, 59, 59, 1000000000, time.UTC),
+}
+
+var tooBigTimes = []time.Time{
+	time.Date(-5879610, 06, 21, 23, 59, 59, 999999999, time.UTC),
+	time.Date(5879611, 07, 11, 0, 0, 1, 0, time.UTC),
+	time.Date(5879611, 07, 11, 0, 0, 0, 1000000000, time.UTC),
+}
 
 var isDatetimeSupported = false
 
@@ -76,10 +83,15 @@ func assertDatetimeIsEqual(t *testing.T, tuples []interface{}, tm time.Time) {
 }
 
 func tupleInsertSelectDelete(t *testing.T, conn *Connection, tm time.Time) {
-	dt := NewDatetime(tm)
+	t.Helper()
+
+	dt, err := NewDatetime(tm)
+	if err != nil {
+		t.Fatalf("Unable to create Datetime from %s: %s", tm, err)
+	}
 
 	// Insert tuple with datetime.
-	_, err := conn.Insert(spaceTuple1, []interface{}{dt, "payload"})
+	_, err = conn.Insert(spaceTuple1, []interface{}{dt, "payload"})
 	if err != nil {
 		t.Fatalf("Datetime insert failed: %s", err.Error())
 	}
@@ -191,16 +203,27 @@ func TestDatetimeMax(t *testing.T) {
 	conn := connectWithValidation(t)
 	defer conn.Close()
 
-	tupleInsertSelectDelete(t, conn, maxTime)
+	for _, tm := range maxTimes {
+		t.Run(tm.String(), func(t *testing.T) {
+			tupleInsertSelectDelete(t, conn, tm)
+		})
+	}
 }
 
-func TestDatetimeMin(t *testing.T) {
+func TestDatetimeTooBig(t *testing.T) {
 	skipIfDatetimeUnsupported(t)
 
 	conn := connectWithValidation(t)
 	defer conn.Close()
 
-	tupleInsertSelectDelete(t, conn, minTime)
+	for _, tm := range tooBigTimes {
+		t.Run(tm.String(), func(t *testing.T) {
+			_, err := NewDatetime(tm)
+			if err == nil {
+				t.Errorf("Time %s should be unsupported!", tm)
+			}
+		})
+	}
 }
 
 func TestDatetimeReplace(t *testing.T) {
@@ -214,7 +237,10 @@ func TestDatetimeReplace(t *testing.T) {
 		t.Fatalf("Time parse failed: %s", err)
 	}
 
-	dt := NewDatetime(tm)
+	dt, err := NewDatetime(tm)
+	if err != nil {
+		t.Fatalf("Unable to create Datetime from %s: %s", tm, err)
+	}
 	resp, err := conn.Replace(spaceTuple1, []interface{}{dt, "payload"})
 	if err != nil {
 		t.Fatalf("Datetime replace failed: %s", err)
@@ -359,16 +385,24 @@ func TestCustomEncodeDecodeTuple1(t *testing.T) {
 	conn := connectWithValidation(t)
 	defer conn.Close()
 
-	dt1, _ := time.Parse(time.RFC3339, "2010-05-24T17:51:56.000000009Z")
-	dt2, _ := time.Parse(time.RFC3339, "2022-05-24T17:51:56.000000009Z")
+	tm1, _ := time.Parse(time.RFC3339, "2010-05-24T17:51:56.000000009Z")
+	tm2, _ := time.Parse(time.RFC3339, "2022-05-24T17:51:56.000000009Z")
+	dt1, err := NewDatetime(tm1)
+	if err != nil {
+		t.Fatalf("Unable to create Datetime from %s: %s", tm1, err)
+	}
+	dt2, err := NewDatetime(tm2)
+	if err != nil {
+		t.Fatalf("Unable to create Datetime from %s: %s", tm2, err)
+	}
 	const cid = 13
 	const orig = "orig"
 
 	tuple := Tuple2{Cid: cid,
 		Orig: orig,
 		Events: []Event{
-			{*NewDatetime(dt1), "Minsk"},
-			{*NewDatetime(dt2), "Moscow"},
+			{*dt1, "Minsk"},
+			{*dt2, "Moscow"},
 		},
 	}
 	resp, err := conn.Replace(spaceTuple2, &tuple)
@@ -405,7 +439,7 @@ func TestCustomEncodeDecodeTuple1(t *testing.T) {
 		t.Fatalf("Unable to convert 2 field to []interface{}")
 	}
 
-	for i, tv := range []time.Time{dt1, dt2} {
+	for i, tv := range []time.Time{tm1, tm2} {
 		dt := events[i].([]interface{})[1].(Datetime)
 		if !dt.ToTime().Equal(tv) {
 			t.Fatalf("%v != %v", dt.ToTime(), tv)
@@ -463,8 +497,11 @@ func TestCustomEncodeDecodeTuple5(t *testing.T) {
 	defer conn.Close()
 
 	tm := time.Unix(500, 1000)
-	dt := NewDatetime(tm)
-	_, err := conn.Insert(spaceTuple1, []interface{}{dt})
+	dt, err := NewDatetime(tm)
+	if err != nil {
+		t.Fatalf("Unable to create Datetime from %s: %s", tm, err)
+	}
+	_, err = conn.Insert(spaceTuple1, []interface{}{dt})
 	if err != nil {
 		t.Fatalf("Datetime insert failed: %s", err.Error())
 	}
@@ -495,7 +532,10 @@ func TestMPEncode(t *testing.T) {
 			if err != nil {
 				t.Fatalf("Time (%s) parse failed: %s", testcase.dt, err)
 			}
-			dt := NewDatetime(tm)
+			dt, err := NewDatetime(tm)
+			if err != nil {
+				t.Fatalf("Unable to create Datetime from %s: %s", tm, err)
+			}
 			buf, err := msgpack.Marshal(dt)
 			if err != nil {
 				t.Fatalf("Marshalling failed: %s", err.Error())

datetime/example_test.go

@@ -35,7 +35,11 @@ func Example() {
 		fmt.Printf("error in time.Parse() is %v", err)
 		return
 	}
-	dt := NewDatetime(tm)
+	dt, err := NewDatetime(tm)
+	if err != nil {
+		fmt.Printf("Unable to create Datetime from %s: %s", tm, err)
+		return
+	}
 
 	space := "testDatetime_1"
 	index := "primary"