Repository: prometheus/common
Pull request #303 (2021-06-02 08:06:29)

Fix marshalling of URL wrapper with nil value.
`MarshalJSON` must return valid JSON. This PR fixes marshalling of `config.URL` wrapper values with `nil` value. It now returns `null`.

~This PR also changes unmarshalling of `null` or `""` JSON strings into URL: in both cases, wrapper with `nil` value is returned.~ (removed from this PR)

Related to https://github.com/prometheus/alertmanager/pull/2607

pstibrany: (This is currently blocking https://github.com/cortexproject/cortex/pull/4237)

Patch:
diff --git a/config/http_config.go b/config/http_config.go
index 350baf7..43f2967 100644
--- a/config/http_config.go
+++ b/config/http_config.go
@@ -130,7 +130,7 @@ func (u URL) MarshalJSON() ([]byte, error) {
 	if u.URL != nil {
 		return json.Marshal(u.URL.String())
 	}
-	return nil, nil
+	return []byte("null"), nil
 }
 
 // OAuth2 is the oauth2 client configuration.
diff --git a/go.mod b/go.mod
index 0c99815..bd5c7e7 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/prometheus/common
 
 require (
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
-	github.com/go-kit/log v0.1.0
+	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
diff --git a/go.sum b/go.sum
index 17d9076..11a93be 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,11 @@
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@@ -6,26 +13,70 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
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@@ -36,18 +87,63 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
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 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190530194941-fb225487d101/go.mod h1:z3L6/3dTEVtUr6QSP8miRzeRqwQOioJ9I66odjN4I7s=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -137,11 +392,26 @@ google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/promlog/log.go b/promlog/log.go
index adb0599..aa306b8 100644
--- a/promlog/log.go
+++ b/promlog/log.go
@@ -21,8 +21,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-kit/log"
-	"github.com/go-kit/log/level"
+	"github.com/go-kit/kit/log"
+	"github.com/go-kit/kit/log/level"
 	"github.com/pkg/errors"
 )
 


Test patch:
diff --git a/config/http_config_test.go b/config/http_config_test.go
index 66fb3de..f1b8ce0 100644
--- a/config/http_config_test.go
+++ b/config/http_config_test.go
@@ -1302,6 +1302,83 @@ func TestMarshalURL(t *testing.T) {
 	}
 }
 
+func TestMarshalURLWrapperWithNilValue(t *testing.T) {
+	u := &URL{}
+
+	c, err := json.Marshal(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(c) != "null" {
+		t.Fatalf("URL with nil value not properly marshaled into JSON, got %q", c)
+	}
+
+	c, err = yaml.Marshal(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(c) != "null\n" {
+		t.Fatalf("URL with nil value not properly marshaled into JSON, got %q", c)
+	}
+}
+
+func TestUnmarshalNullURL(t *testing.T) {
+	b := []byte(`null`)
+
+	{
+		var u URL
+		err := json.Unmarshal(b, &u)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !isEmptyNonNilURL(u.URL) {
+			t.Fatalf("`null` literal not properly unmarshaled from JSON as URL, got %#v", u.URL)
+		}
+	}
+
+	{
+		var u URL
+		err := yaml.Unmarshal(b, &u)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if u.URL != nil { // UnmarshalYAML is not called when parsing null literal.
+			t.Fatalf("`null` literal not properly unmarshaled from YAML as URL, got %#v", u.URL)
+		}
+	}
+}
+
+func TestUnmarshalEmptyURL(t *testing.T) {
+	b := []byte(`""`)
+
+	{
+		var u URL
+		err := json.Unmarshal(b, &u)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !isEmptyNonNilURL(u.URL) {
+			t.Fatalf("empty string not properly unmarshaled from JSON as URL, got %#v", u.URL)
+		}
+	}
+
+	{
+		var u URL
+		err := yaml.Unmarshal(b, &u)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !isEmptyNonNilURL(u.URL) {
+			t.Fatalf("empty string not properly unmarshaled from YAML as URL, got %#v", u.URL)
+		}
+	}
+}
+
+// checks if u equals to &url.URL{}
+func isEmptyNonNilURL(u *url.URL) bool {
+	return u != nil && *u == url.URL{}
+}
+
 func TestUnmarshalURL(t *testing.T) {
 	b := []byte(`"http://example.com/a b"`)
 	var u URL
diff --git a/promlog/log_test.go b/promlog/log_test.go
index 0056708..898393f 100644
--- a/promlog/log_test.go
+++ b/promlog/log_test.go
@@ -17,7 +17,7 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/go-kit/log/level"
+	"github.com/go-kit/kit/log/level"
 	"gopkg.in/yaml.v2"
 )