Repository: prometheus/common
Pull request #246 (2020-07-31 22:19:53)

Add support for more user-friendly duration input
With this pull request, it is possible to write:

6d23h

instead of

167h

Which is a lot more easy to read.

** This is a breaking change, unless we remove the re-marshalling for now. **

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

roidelapluie: user request: https://github.com/prometheus/prometheus/issues/7681
roidelapluie: This would break the people consuming e.g. the rules API.
roidelapluie: Mmh in fact no. We return the duration as an integer. So that's not breaking.
roidelapluie: I have addressed the comments and added more (relevant) tests

Patch:
diff --git a/go.mod b/go.mod
index bfa4fcb..f5b5bb5 100644
--- a/go.mod
+++ b/go.mod
@@ -1,22 +1,21 @@
 module github.com/prometheus/common
 
 require (
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 // indirect
-	github.com/go-kit/kit v0.9.0
-	github.com/go-logfmt/logfmt v0.4.0 // indirect
-	github.com/golang/protobuf v1.3.2
-	github.com/julienschmidt/httprouter v1.2.0
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
+	github.com/go-kit/kit v0.10.0
+	github.com/golang/protobuf v1.4.2
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/julienschmidt/httprouter v1.3.0
 	github.com/matttproud/golang_protobuf_extensions v1.0.1
-	github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223
-	github.com/pkg/errors v0.8.1
-	github.com/prometheus/client_golang v1.0.0
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f
+	github.com/pkg/errors v0.9.1
+	github.com/prometheus/client_golang v1.7.1
 	github.com/prometheus/client_model v0.2.0
-	github.com/sirupsen/logrus v1.4.2
-	golang.org/x/net v0.0.0-20190613194153-d28f0bde5980
-	golang.org/x/sys v0.0.0-20190422165155-953cdadca894
+	github.com/sirupsen/logrus v1.6.0
+	golang.org/x/net v0.0.0-20200625001655-4c5254603344
+	golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
-	gopkg.in/yaml.v2 v2.2.4
+	gopkg.in/yaml.v2 v2.3.0
 )
 
 go 1.11
diff --git a/go.sum b/go.sum
index 7111b28..ff98b40 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,11 @@
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+github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
+github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc h1:cAKDfWh5VpdgMhJosfJnn5/FoN2SRZ4p7fJNX58YPaU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
@@ -6,100 +14,448 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf h1:qet1QNfXsQxTZq
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 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 h1:Hs82Z41s6SdL1CELW+XaDYmOH4hkBN4/N9og/AsOv7E=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
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diff --git a/model/time.go b/model/time.go
index 490a024..57bd661 100644
--- a/model/time.go
+++ b/model/time.go
@@ -181,7 +181,7 @@ func (d *Duration) Type() string {
 	return "duration"
 }
 
-var durationRE = regexp.MustCompile("^([0-9]+)(y|w|d|h|m|s|ms)$")
+var durationRE = regexp.MustCompile("^(([0-9]+)y)?(([0-9]+)w)?(([0-9]+)d)?(([0-9]+)h)?(([0-9]+)m)?(([0-9]+)s)?(([0-9]+)ms)?$")
 
 // ParseDuration parses a string into a time.Duration, assuming that a year
 // always has 365d, a week always has 7d, and a day always has 24h.
@@ -191,67 +191,64 @@ func ParseDuration(durationStr string) (Duration, error) {
 		return 0, nil
 	}
 	matches := durationRE.FindStringSubmatch(durationStr)
-	if len(matches) != 3 {
+	if matches == nil {
 		return 0, fmt.Errorf("not a valid duration string: %q", durationStr)
 	}
-	var (
-		n, _ = strconv.Atoi(matches[1])
-		dur  = time.Duration(n) * time.Millisecond
-	)
-	switch unit := matches[2]; unit {
-	case "y":
-		dur *= 1000 * 60 * 60 * 24 * 365
-	case "w":
-		dur *= 1000 * 60 * 60 * 24 * 7
-	case "d":
-		dur *= 1000 * 60 * 60 * 24
-	case "h":
-		dur *= 1000 * 60 * 60
-	case "m":
-		dur *= 1000 * 60
-	case "s":
-		dur *= 1000
-	case "ms":
-		// Value already correct
-	default:
-		return 0, fmt.Errorf("invalid time unit in duration string: %q", unit)
+	var dur time.Duration
+
+	// Parse the match at pos `pos` in the regex and use `mult` to turn that
+	// into ms, then add that value to the total parsed duration.
+	m := func(pos int, mult time.Duration) {
+		if matches[pos] == "" {
+			return
+		}
+		n, _ := strconv.Atoi(matches[pos])
+		d := time.Duration(n) * time.Millisecond
+		dur += d * mult
 	}
+
+	m(2, 1000*60*60*24*365) // y
+	m(4, 1000*60*60*24*7)   // w
+	m(6, 1000*60*60*24)     // d
+	m(8, 1000*60*60)        // h
+	m(10, 1000*60)          // m
+	m(12, 1000)             // s
+	m(14, 1)                // ms
+
 	return Duration(dur), nil
 }
 
 func (d Duration) String() string {
 	var (
-		ms   = int64(time.Duration(d) / time.Millisecond)
-		unit = "ms"
+		ms = int64(time.Duration(d) / time.Millisecond)
+		r  = ""
 	)
 	if ms == 0 {
 		return "0s"
 	}
-	factors := map[string]int64{
-		"y":  1000 * 60 * 60 * 24 * 365,
-		"w":  1000 * 60 * 60 * 24 * 7,
-		"d":  1000 * 60 * 60 * 24,
-		"h":  1000 * 60 * 60,
-		"m":  1000 * 60,
-		"s":  1000,
-		"ms": 1,
-	}
 
-	switch int64(0) {
-	case ms % factors["y"]:
-		unit = "y"
-	case ms % factors["w"]:
-		unit = "w"
-	case ms % factors["d"]:
-		unit = "d"
-	case ms % factors["h"]:
-		unit = "h"
-	case ms % factors["m"]:
-		unit = "m"
-	case ms % factors["s"]:
-		unit = "s"
+	f := func(unit string, mult int64, exact bool) {
+		if exact && ms%mult != 0 {
+			return
+		}
+		if v := ms / mult; v > 0 {
+			r += fmt.Sprintf("%d%s", v, unit)
+			ms -= v * mult
+		}
 	}
-	return fmt.Sprintf("%v%v", ms/factors[unit], unit)
+
+	// Only format years and weeks if the remainder is zero, as it is often
+	// easier to read 90d than 12w6d.
+	f("y", 1000*60*60*24*365, true)
+	f("w", 1000*60*60*24*7, true)
+
+	f("d", 1000*60*60*24, false)
+	f("h", 1000*60*60, false)
+	f("m", 1000*60, false)
+	f("s", 1000, false)
+	f("ms", 1, false)
+
+	return r
 }
 
 // MarshalYAML implements the yaml.Marshaler interface.


Test patch:
diff --git a/model/time_test.go b/model/time_test.go
index 330cc6e..cf7da71 100644
--- a/model/time_test.go
+++ b/model/time_test.go
@@ -97,6 +97,10 @@ func TestParseDuration(t *testing.T) {
 			in:             "0",
 			out:            0,
 			expectedString: "0s",
+		}, {
+			in:             "0w",
+			out:            0,
+			expectedString: "0s",
 		}, {
 			in:  "0s",
 			out: 0,
@@ -115,9 +119,20 @@ func TestParseDuration(t *testing.T) {
 		}, {
 			in:  "4d",
 			out: 4 * 24 * time.Hour,
+		}, {
+			in:  "4d1h",
+			out: 4*24*time.Hour + time.Hour,
+		}, {
+			in:             "14d",
+			out:            14 * 24 * time.Hour,
+			expectedString: "2w",
 		}, {
 			in:  "3w",
 			out: 3 * 7 * 24 * time.Hour,
+		}, {
+			in:             "3w2d1h",
+			out:            3*7*24*time.Hour + 2*24*time.Hour + time.Hour,
+			expectedString: "23d1h",
 		}, {
 			in:  "10y",
 			out: 10 * 365 * 24 * time.Hour,
@@ -142,6 +157,23 @@ func TestParseDuration(t *testing.T) {
 	}
 }
 
+func TestParseBadDuration(t *testing.T) {
+	var cases = []string{
+		"1",
+		"1y1m1d",
+		"-1w",
+		"1.5d",
+	}
+
+	for _, c := range cases {
+		_, err := ParseDuration(c)
+		if err == nil {
+			t.Errorf("Expected error on input %s", c)
+		}
+
+	}
+}
+
 func TestTimeJSON(t *testing.T) {
 	tests := []struct {
 		in  Time