Fix issues with unpopulated gc_rules and handling of Xd duration (#8686…

…) (#15595)

* Fix issues with unpopulated gc_rules and handling of Xd duration

* Fix copt/paste issues

* Extract duration_parsing_helper.go

* Extract duration_parsing_helper.go

* Add unit tests

* Add time.UNIT

* Fixed duration helper

* Add better handling for days and hours

* Add better handling for days and hours

* fixed issue with diffs between gc_rules

* minor fix

* Add tests

* package name fix

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

Signed-off-by: Modular Magician <magic-modules@google.com>

.changelog/8686.txt

@@ -0,0 +1,6 @@
+```release-note:bug
+bigtable: fixed permadiff in `google_bigtable_gc_policy.gc_rules` when `mode` is specified
+```
+```release-note:bug
+bigtable: fixed permadiff in `google_bigtable_gc_policy.gc_rules` when `max_age` is specified using increments larger than hours
+```

google/services/bigtable/duration_parsing_helper.go

@@ -0,0 +1,223 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+package bigtable
+
+import (
+	"errors"
+	"time"
+)
+
+var unitMap = map[string]uint64{
+	"ns": uint64(time.Nanosecond),
+	"us": uint64(time.Microsecond),
+	"µs": uint64(time.Microsecond), // U+00B5 = micro symbol
+	"μs": uint64(time.Microsecond), // U+03BC = Greek letter mu
+	"ms": uint64(time.Millisecond),
+	"s":  uint64(time.Second),
+	"m":  uint64(time.Minute),
+	"h":  uint64(time.Hour),
+	"d":  uint64(time.Hour) * 24,
+	"w":  uint64(time.Hour) * 24 * 7,
+}
+
+// ParseDuration parses a duration string.
+// A duration string is a possibly signed sequence of
+// decimal numbers, each with optional fraction and a unit suffix,
+// such as "300ms", "-1.5h" or "2h45m".
+// Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
+func ParseDuration(s string) (time.Duration, error) {
+	// [-+]?([0-9]*(\.[0-9]*)?[a-z]+)+
+	orig := s
+	var d uint64
+	neg := false
+
+	// Consume [-+]?
+	if s != "" {
+		c := s[0]
+		if c == '-' || c == '+' {
+			neg = c == '-'
+			s = s[1:]
+		}
+	}
+	// Special case: if all that is left is "0", this is zero.
+	if s == "0" {
+		return 0, nil
+	}
+	if s == "" {
+		return 0, errors.New("time: invalid duration " + quote(orig))
+	}
+	for s != "" {
+		var (
+			v, f  uint64      // integers before, after decimal point
+			scale float64 = 1 // value = v + f/scale
+		)
+
+		var err error
+
+		// The next character must be [0-9.]
+		if !(s[0] == '.' || '0' <= s[0] && s[0] <= '9') {
+			return 0, errors.New("time: invalid duration " + quote(orig))
+		}
+		// Consume [0-9]*
+		pl := len(s)
+		v, s, err = leadingInt(s)
+		if err != nil {
+			return 0, errors.New("time: invalid duration " + quote(orig))
+		}
+		pre := pl != len(s) // whether we consumed anything before a period
+
+		// Consume (\.[0-9]*)?
+		post := false
+		if s != "" && s[0] == '.' {
+			s = s[1:]
+			pl := len(s)
+			f, scale, s = leadingFraction(s)
+			post = pl != len(s)
+		}
+		if !pre && !post {
+			// no digits (e.g. ".s" or "-.s")
+			return 0, errors.New("time: invalid duration " + quote(orig))
+		}
+
+		// Consume unit.
+		i := 0
+		for ; i < len(s); i++ {
+			c := s[i]
+			if c == '.' || '0' <= c && c <= '9' {
+				break
+			}
+		}
+		if i == 0 {
+			return 0, errors.New("time: missing unit in duration " + quote(orig))
+		}
+		u := s[:i]
+		s = s[i:]
+		unit, ok := unitMap[u]
+		if !ok {
+			return 0, errors.New("time: unknown unit " + quote(u) + " in duration " + quote(orig))
+		}
+		if v > 1<<63/unit {
+			// overflow
+			return 0, errors.New("time: invalid duration " + quote(orig))
+		}
+		v *= unit
+		if f > 0 {
+			// float64 is needed to be nanosecond accurate for fractions of hours.
+			// v >= 0 && (f*unit/scale) <= 3.6e+12 (ns/h, h is the largest unit)
+			v += uint64(float64(f) * (float64(unit) / scale))
+			if v > 1<<63 {
+				// overflow
+				return 0, errors.New("time: invalid duration " + quote(orig))
+			}
+		}
+		d += v
+		if d > 1<<63 {
+			return 0, errors.New("time: invalid duration " + quote(orig))
+		}
+	}
+	if neg {
+		return -time.Duration(d), nil
+	}
+	if d > 1<<63-1 {
+		return 0, errors.New("time: invalid duration " + quote(orig))
+	}
+	return time.Duration(d), nil
+}
+
+var errLeadingInt = errors.New("time: bad [0-9]*") // never printed
+
+// leadingInt consumes the leading [0-9]* from s.
+func leadingInt[bytes []byte | string](s bytes) (x uint64, rem bytes, err error) {
+	i := 0
+	for ; i < len(s); i++ {
+		c := s[i]
+		if c < '0' || c > '9' {
+			break
+		}
+		if x > 1<<63/10 {
+			// overflow
+			return 0, rem, errLeadingInt
+		}
+		x = x*10 + uint64(c) - '0'
+		if x > 1<<63 {
+			// overflow
+			return 0, rem, errLeadingInt
+		}
+	}
+	return x, s[i:], nil
+}
+
+// leadingFraction consumes the leading [0-9]* from s.
+// It is used only for fractions, so does not return an error on overflow,
+// it just stops accumulating precision.
+func leadingFraction(s string) (x uint64, scale float64, rem string) {
+	i := 0
+	scale = 1
+	overflow := false
+	for ; i < len(s); i++ {
+		c := s[i]
+		if c < '0' || c > '9' {
+			break
+		}
+		if overflow {
+			continue
+		}
+		if x > (1<<63-1)/10 {
+			// It's possible for overflow to give a positive number, so take care.
+			overflow = true
+			continue
+		}
+		y := x*10 + uint64(c) - '0'
+		if y > 1<<63 {
+			overflow = true
+			continue
+		}
+		x = y
+		scale *= 10
+	}
+	return x, scale, s[i:]
+}
+
+// These are borrowed from unicode/utf8 and strconv and replicate behavior in
+// that package, since we can't take a dependency on either.
+const (
+	lowerhex  = "0123456789abcdef"
+	runeSelf  = 0x80
+	runeError = '\uFFFD'
+)
+
+func quote(s string) string {
+	buf := make([]byte, 1, len(s)+2) // slice will be at least len(s) + quotes
+	buf[0] = '"'
+	for i, c := range s {
+		if c >= runeSelf || c < ' ' {
+			// This means you are asking us to parse a time.Duration or
+			// time.Location with unprintable or non-ASCII characters in it.
+			// We don't expect to hit this case very often. We could try to
+			// reproduce strconv.Quote's behavior with full fidelity but
+			// given how rarely we expect to hit these edge cases, speed and
+			// conciseness are better.
+			var width int
+			if c == runeError {
+				width = 1
+				if i+2 < len(s) && s[i:i+3] == string(runeError) {
+					width = 3
+				}
+			} else {
+				width = len(string(c))
+			}
+			for j := 0; j < width; j++ {
+				buf = append(buf, `\x`...)
+				buf = append(buf, lowerhex[s[i+j]>>4])
+				buf = append(buf, lowerhex[s[i+j]&0xF])
+			}
+		} else {
+			if c == '"' || c == '\\' {
+				buf = append(buf, '\\')
+			}
+			buf = append(buf, string(c)...)
+		}
+	}
+	buf = append(buf, '"')
+	return string(buf)
+}

google/services/bigtable/duration_parsing_helper_test.go

@@ -0,0 +1,157 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+package bigtable_test
+
+import (
+	"math"
+	"math/rand"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/hashicorp/terraform-provider-google/google/services/bigtable"
+)
+
+var parseDurationTests = []struct {
+	in   string
+	want time.Duration
+}{
+	// simple
+	{"0", 0},
+	{"5s", 5 * time.Second},
+	{"30s", 30 * time.Second},
+	{"1478s", 1478 * time.Second},
+	// sign
+	{"-5s", -5 * time.Second},
+	{"+5s", 5 * time.Second},
+	{"-0", 0},
+	{"+0", 0},
+	// decimal
+	{"5.0s", 5 * time.Second},
+	{"5.6s", 5*time.Second + 600*time.Millisecond},
+	{"5.s", 5 * time.Second},
+	{".5s", 500 * time.Millisecond},
+	{"1.0s", 1 * time.Second},
+	{"1.00s", 1 * time.Second},
+	{"1.004s", 1*time.Second + 4*time.Millisecond},
+	{"1.0040s", 1*time.Second + 4*time.Millisecond},
+	{"100.00100s", 100*time.Second + 1*time.Millisecond},
+	// different units
+	{"10ns", 10 * time.Nanosecond},
+	{"11us", 11 * time.Microsecond},
+	{"12µs", 12 * time.Microsecond}, // U+00B5
+	{"12μs", 12 * time.Microsecond}, // U+03BC
+	{"13ms", 13 * time.Millisecond},
+	{"14s", 14 * time.Second},
+	{"15m", 15 * time.Minute},
+	{"16h", 16 * time.Hour},
+	{"5d", 5 * 24 * time.Hour},
+	// composite durations
+	{"3h30m", 3*time.Hour + 30*time.Minute},
+	{"10.5s4m", 4*time.Minute + 10*time.Second + 500*time.Millisecond},
+	{"-2m3.4s", -(2*time.Minute + 3*time.Second + 400*time.Millisecond)},
+	{"1h2m3s4ms5us6ns", 1*time.Hour + 2*time.Minute + 3*time.Second + 4*time.Millisecond + 5*time.Microsecond + 6*time.Nanosecond},
+	{"39h9m14.425s", 39*time.Hour + 9*time.Minute + 14*time.Second + 425*time.Millisecond},
+	// large value
+	{"52763797000ns", 52763797000 * time.Nanosecond},
+	// more than 9 digits after decimal point, see https://golang.org/issue/6617
+	{"0.3333333333333333333h", 20 * time.Minute},
+	// 9007199254740993 = 1<<53+1 cannot be stored precisely in a float64
+	{"9007199254740993ns", (1<<53 + 1) * time.Nanosecond},
+	// largest duration that can be represented by int64 in nanoseconds
+	{"9223372036854775807ns", (1<<63 - 1) * time.Nanosecond},
+	{"9223372036854775.807us", (1<<63 - 1) * time.Nanosecond},
+	{"9223372036s854ms775us807ns", (1<<63 - 1) * time.Nanosecond},
+	{"-9223372036854775808ns", -1 << 63 * time.Nanosecond},
+	{"-9223372036854775.808us", -1 << 63 * time.Nanosecond},
+	{"-9223372036s854ms775us808ns", -1 << 63 * time.Nanosecond},
+	// largest negative value
+	{"-9223372036854775808ns", -1 << 63 * time.Nanosecond},
+	// largest negative round trip value, see https://golang.org/issue/48629
+	{"-2562047h47m16.854775808s", -1 << 63 * time.Nanosecond},
+	// huge string; issue 15011.
+	{"0.100000000000000000000h", 6 * time.Minute},
+	// This value tests the first overflow check in leadingFraction.
+	{"0.830103483285477580700h", 49*time.Minute + 48*time.Second + 372539827*time.Nanosecond},
+}
+
+func TestParseDuration(t *testing.T) {
+	for _, tc := range parseDurationTests {
+		d, err := bigtable.ParseDuration(tc.in)
+		if err != nil || d != tc.want {
+			t.Errorf("bigtable.ParseDuration(%q) = %v, %v, want %v, nil", tc.in, d, err, tc.want)
+		}
+	}
+}
+
+var parseDurationErrorTests = []struct {
+	in     string
+	expect string
+}{
+	// invalid
+	{"", `""`},
+	{"3", `"3"`},
+	{"-", `"-"`},
+	{"s", `"s"`},
+	{".", `"."`},
+	{"-.", `"-."`},
+	{".s", `".s"`},
+	{"+.s", `"+.s"`},
+	{"\x85\x85", `"\x85\x85"`},
+	{"\xffff", `"\xffff"`},
+	{"hello \xffff world", `"hello \xffff world"`},
+	{"\uFFFD", `"\xef\xbf\xbd"`},                                             // utf8.RuneError
+	{"\uFFFD hello \uFFFD world", `"\xef\xbf\xbd hello \xef\xbf\xbd world"`}, // utf8.RuneError
+	// overflow
+	{"9223372036854775810ns", `"9223372036854775810ns"`},
+	{"9223372036854775808ns", `"9223372036854775808ns"`},
+	{"-9223372036854775809ns", `"-9223372036854775809ns"`},
+	{"9223372036854776us", `"9223372036854776us"`},
+	{"3000000h", `"3000000h"`},
+	{"9223372036854775.808us", `"9223372036854775.808us"`},
+	{"9223372036854ms775us808ns", `"9223372036854ms775us808ns"`},
+}
+
+func TestParseDurationErrors(t *testing.T) {
+	for _, tc := range parseDurationErrorTests {
+		_, err := bigtable.ParseDuration(tc.in)
+		if err == nil {
+			t.Errorf("bigtable.ParseDuration(%q) = _, nil, want _, non-nil", tc.in)
+		} else if !strings.Contains(err.Error(), tc.expect) {
+			t.Errorf("bigtable.ParseDuration(%q) = _, %q, error does not contain %q", tc.in, err, tc.expect)
+		}
+	}
+}
+
+func TestParseDurationRoundTrip(t *testing.T) {
+	// https://golang.org/issue/48629
+	max0 := time.Duration(math.MaxInt64)
+	max1, err := bigtable.ParseDuration(max0.String())
+	if err != nil || max0 != max1 {
+		t.Errorf("round-trip failed: %d => %q => %d, %v", max0, max0.String(), max1, err)
+	}
+
+	min0 := time.Duration(math.MinInt64)
+	min1, err := bigtable.ParseDuration(min0.String())
+	if err != nil || min0 != min1 {
+		t.Errorf("round-trip failed: %d => %q => %d, %v", min0, min0.String(), min1, err)
+	}
+
+	for i := 0; i < 100; i++ {
+		// Resolutions finer than milliseconds will result in
+		// imprecise round-trips.
+		d0 := time.Duration(rand.Int31()) * time.Millisecond
+		s := d0.String()
+		d1, err := bigtable.ParseDuration(s)
+		if err != nil || d0 != d1 {
+			t.Errorf("round-trip failed: %d => %q => %d, %v", d0, s, d1, err)
+		}
+	}
+}
+
+func BenchmarkParseDuration(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		bigtable.ParseDuration("9007199254.740993ms")
+		bigtable.ParseDuration("9007199254740993ns")
+	}
+}