Call an optional webhook before killing a pod

Miouge1 · Miouge1 · commit e19e2a5f0213 · 2019-09-24T16:20:21.000+02:00
diff --git a/README.md b/README.md
@@ -90,6 +90,8 @@ spec:
         - --timezone=Europe/Berlin
         # exclude all pods that haven't been running for at least one hour
         - --minimum-age=1h
+        # check with a webhook before killing a pod
+        - --webhook=https://httpbin.org/post
         # terminate pods for real: this disables dry-run mode which is on by default
         # - --no-dry-run
 ```
@@ -234,6 +236,7 @@ Use `UTC`, `Local` or pick a timezone name from the [(IANA) tz database](https:/
 | `--dry-run`               | don't kill pods, only log what would have been done                  | true                       |
 | `--log-format`            | specify the format of the log messages. Options are text and json    | text                       |
 | `--log-caller`            | include the calling function name and location in the log messages   | false                      |
+| `--webhook`               | filter pods by a POST webhook, if non HTTP 200 returned, exclude pod | no webhook calls           |
 
 ## Related work
 
diff --git a/chaoskube/chaoskube.go b/chaoskube/chaoskube.go
@@ -1,10 +1,14 @@
 package chaoskube
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"math/rand"
+	"net/http"
+	"net/url"
 	"regexp"
 	"time"
 
@@ -63,6 +67,8 @@ type Chaoskube struct {
 	EventRecorder record.EventRecorder
 	// a function to retrieve the current time
 	Now func() time.Time
+	// Webhook
+	Webhook url.URL
 }
 
 var (
@@ -86,7 +92,7 @@ var (
 // * a logger implementing logrus.FieldLogger to send log output to
 // * what specific terminator to use to imbue chaos on victim pods
 // * whether to enable/disable dry-run mode
-func New(client kubernetes.Interface, labels, annotations, namespaces, namespaceLabels labels.Selector, includedPodNames, excludedPodNames *regexp.Regexp, excludedWeekdays []time.Weekday, excludedTimesOfDay []util.TimePeriod, excludedDaysOfYear []time.Time, timezone *time.Location, minimumAge time.Duration, logger log.FieldLogger, dryRun bool, terminator terminator.Terminator) *Chaoskube {
+func New(client kubernetes.Interface, labels, annotations, namespaces, namespaceLabels labels.Selector, includedPodNames, excludedPodNames *regexp.Regexp, excludedWeekdays []time.Weekday, excludedTimesOfDay []util.TimePeriod, excludedDaysOfYear []time.Time, timezone *time.Location, minimumAge time.Duration, logger log.FieldLogger, dryRun bool, terminator terminator.Terminator, Webhook url.URL) *Chaoskube {
 	broadcaster := record.NewBroadcaster()
 	broadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: client.CoreV1().Events(v1.NamespaceAll)})
 	recorder := broadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "chaoskube"})
@@ -109,6 +115,7 @@ func New(client kubernetes.Interface, labels, annotations, namespaces, namespace
 		Terminator:         terminator,
 		EventRecorder:      recorder,
 		Now:                time.Now,
+		Webhook:            Webhook,
 	}
 }
 
@@ -212,6 +219,7 @@ func (c *Chaoskube) Candidates() ([]v1.Pod, error) {
 	pods = filterByPhase(pods, v1.PodRunning)
 	pods = filterByMinimumAge(pods, c.MinimumAge, c.Now())
 	pods = filterByPodName(pods, c.IncludedPodNames, c.ExcludedPodNames)
+	pods = filterByWebhook(pods, c.Webhook)
 
 	return pods, nil
 }
@@ -409,3 +417,32 @@ func filterByPodName(pods []v1.Pod, includedPodNames, excludedPodNames *regexp.R
 
 	return filteredList
 }
+
+// filterByWebhook filters pods by a POST webhook. Only pods where the webhooks returns an
+// HTTP 200 are returned
+func filterByWebhook(pods []v1.Pod, url url.URL) []v1.Pod {
+	// return early if url is not given
+	if url.String() == "" {
+		return pods
+	}
+
+	filteredList := []v1.Pod{}
+
+	for _, pod := range pods {
+		postData := new(bytes.Buffer)
+		err := json.NewEncoder(postData).Encode(pod)
+		if err != nil {
+			continue
+		}
+		resp, err := http.Post(url.String(), "application/json", postData)
+		if err != nil {
+			continue
+		}
+
+		if resp.StatusCode == http.StatusOK {
+			filteredList = append(filteredList, pod)
+		}
+	}
+
+	return filteredList
+}
diff --git a/chaoskube/chaoskube_test.go b/chaoskube/chaoskube_test.go
@@ -3,6 +3,7 @@ package chaoskube
 import (
 	"context"
 	"math/rand"
+	"net/url"
 	"regexp"
 	"testing"
 	"time"
@@ -46,13 +47,14 @@ func (suite *Suite) TestNew() {
 		includedPodNames   = regexp.MustCompile("foo")
 		excludedPodNames   = regexp.MustCompile("bar")
 		excludedWeekdays   = []time.Weekday{time.Friday}
-		excludedTimesOfDay = []util.TimePeriod{util.TimePeriod{}}
+		excludedTimesOfDay = []util.TimePeriod{{}}
 		excludedDaysOfYear = []time.Time{time.Now()}
 		minimumAge         = time.Duration(42)
 		dryRun             = true
 		terminator         = terminator.NewDeletePodTerminator(client, logger, 10*time.Second)
 	)
 
+	webhook, _ := url.Parse("")
 	chaoskube := New(
 		client,
 		labelSelector,
@@ -69,6 +71,7 @@ func (suite *Suite) TestNew() {
 		logger,
 		dryRun,
 		terminator,
+		*webhook,
 	)
 	suite.Require().NotNil(chaoskube)
 
@@ -105,6 +108,7 @@ func (suite *Suite) TestRunContextCanceled() {
 		time.Duration(0),
 		false,
 		10,
+		url.URL{},
 	)
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -122,19 +126,20 @@ func (suite *Suite) TestCandidates() {
 		labelSelector      string
 		annotationSelector string
 		namespaceSelector  string
+		webhook            string
 		pods               []map[string]string
 	}{
-		{"", "", "", []map[string]string{foo, bar}},
-		{"app=foo", "", "", []map[string]string{foo}},
-		{"app!=foo", "", "", []map[string]string{bar}},
-		{"", "chaos=foo", "", []map[string]string{foo}},
-		{"", "chaos!=foo", "", []map[string]string{bar}},
-		{"", "", "default", []map[string]string{foo}},
-		{"", "", "default,testing", []map[string]string{foo, bar}},
-		{"", "", "!testing", []map[string]string{foo}},
-		{"", "", "!default,!testing", []map[string]string{}},
-		{"", "", "default,!testing", []map[string]string{foo}},
-		{"", "", "default,!default", []map[string]string{}},
+		{"", "", "", "", []map[string]string{foo, bar}},
+		{"app=foo", "", "", "", []map[string]string{foo}},
+		{"app!=foo", "", "", "", []map[string]string{bar}},
+		{"", "chaos=foo", "", "", []map[string]string{foo}},
+		{"", "chaos!=foo", "", "", []map[string]string{bar}},
+		{"", "", "default", "", []map[string]string{foo}},
+		{"", "", "default,testing", "", []map[string]string{foo, bar}},
+		{"", "", "!testing", "", []map[string]string{foo}},
+		{"", "", "!default,!testing", "", []map[string]string{}},
+		{"", "", "default,!testing", "", []map[string]string{foo}},
+		{"", "", "default,!default", "", []map[string]string{}},
 	} {
 		labelSelector, err := labels.Parse(tt.labelSelector)
 		suite.Require().NoError(err)
@@ -159,6 +164,7 @@ func (suite *Suite) TestCandidates() {
 			time.Duration(0),
 			false,
 			10,
+			url.URL{},
 		)
 
 		suite.assertCandidates(chaoskube, tt.pods)
@@ -203,6 +209,7 @@ func (suite *Suite) TestCandidatesNamespaceLabels() {
 			time.Duration(0),
 			false,
 			10,
+			url.URL{},
 		)
 
 		suite.assertCandidates(chaoskube, tt.pods)
@@ -245,6 +252,7 @@ func (suite *Suite) TestCandidatesPodNameRegexp() {
 			time.Duration(0),
 			false,
 			10,
+			url.URL{},
 		)
 
 		suite.assertCandidates(chaoskube, tt.pods)
@@ -284,6 +292,7 @@ func (suite *Suite) TestVictim() {
 			time.Duration(0),
 			false,
 			10,
+			url.URL{},
 		)
 
 		suite.assertVictim(chaoskube, tt.victim)
@@ -306,6 +315,7 @@ func (suite *Suite) TestNoVictimReturnsError() {
 		time.Duration(0),
 		false,
 		10,
+		url.URL{},
 	)
 
 	_, err := chaoskube.Victim()
@@ -339,6 +349,7 @@ func (suite *Suite) TestDeletePod() {
 			time.Duration(0),
 			tt.dryRun,
 			10,
+			url.URL{},
 		)
 
 		victim := util.NewPod("default", "foo", v1.PodRunning)
@@ -367,6 +378,7 @@ func (suite *Suite) TestDeletePodNotFound() {
 		time.Duration(0),
 		false,
 		10,
+		url.URL{},
 	)
 
 	victim := util.NewPod("default", "foo", v1.PodRunning)
@@ -597,6 +609,7 @@ func (suite *Suite) TestTerminateVictim() {
 			time.Duration(0),
 			false,
 			10,
+			url.URL{},
 		)
 		chaoskube.Now = tt.now
 
@@ -626,6 +639,7 @@ func (suite *Suite) TestTerminateNoVictimLogsInfo() {
 		time.Duration(0),
 		false,
 		10,
+		url.URL{},
 	)
 
 	err := chaoskube.TerminateVictim()
@@ -650,7 +664,7 @@ func (suite *Suite) assertVictim(chaoskube *Chaoskube, expected map[string]strin
 	suite.AssertPod(victim, expected)
 }
 
-func (suite *Suite) setupWithPods(labelSelector labels.Selector, annotations labels.Selector, namespaces labels.Selector, namespaceLabels labels.Selector, includedPodNames *regexp.Regexp, excludedPodNames *regexp.Regexp, excludedWeekdays []time.Weekday, excludedTimesOfDay []util.TimePeriod, excludedDaysOfYear []time.Time, timezone *time.Location, minimumAge time.Duration, dryRun bool, gracePeriod time.Duration) *Chaoskube {
+func (suite *Suite) setupWithPods(labelSelector labels.Selector, annotations labels.Selector, namespaces labels.Selector, namespaceLabels labels.Selector, includedPodNames *regexp.Regexp, excludedPodNames *regexp.Regexp, excludedWeekdays []time.Weekday, excludedTimesOfDay []util.TimePeriod, excludedDaysOfYear []time.Time, timezone *time.Location, minimumAge time.Duration, dryRun bool, gracePeriod time.Duration, webhook url.URL) *Chaoskube {
 	chaoskube := suite.setup(
 		labelSelector,
 		annotations,
@@ -665,6 +679,7 @@ func (suite *Suite) setupWithPods(labelSelector labels.Selector, annotations lab
 		minimumAge,
 		dryRun,
 		gracePeriod,
+		webhook,
 	)
 
 	for _, namespace := range []v1.Namespace{
@@ -689,7 +704,7 @@ func (suite *Suite) setupWithPods(labelSelector labels.Selector, annotations lab
 	return chaoskube
 }
 
-func (suite *Suite) setup(labelSelector labels.Selector, annotations labels.Selector, namespaces labels.Selector, namespaceLabels labels.Selector, includedPodNames *regexp.Regexp, excludedPodNames *regexp.Regexp, excludedWeekdays []time.Weekday, excludedTimesOfDay []util.TimePeriod, excludedDaysOfYear []time.Time, timezone *time.Location, minimumAge time.Duration, dryRun bool, gracePeriod time.Duration) *Chaoskube {
+func (suite *Suite) setup(labelSelector labels.Selector, annotations labels.Selector, namespaces labels.Selector, namespaceLabels labels.Selector, includedPodNames *regexp.Regexp, excludedPodNames *regexp.Regexp, excludedWeekdays []time.Weekday, excludedTimesOfDay []util.TimePeriod, excludedDaysOfYear []time.Time, timezone *time.Location, minimumAge time.Duration, dryRun bool, gracePeriod time.Duration, webhook url.URL) *Chaoskube {
 	logOutput.Reset()
 
 	client := fake.NewSimpleClientset()
@@ -711,6 +726,7 @@ func (suite *Suite) setup(labelSelector labels.Selector, annotations labels.Sele
 		logger,
 		dryRun,
 		terminator.NewDeletePodTerminator(client, nullLogger, gracePeriod),
+		url.URL{},
 	)
 }
 
@@ -814,6 +830,7 @@ func (suite *Suite) TestMinimumAge() {
 			tt.minimumAge,
 			false,
 			10,
+			url.URL{},
 		)
 		chaoskube.Now = tt.now
 
diff --git a/go.sum b/go.sum
@@ -11,6 +11,7 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -37,12 +38,14 @@ github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903/go.mod h1:cIg4er
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/google/btree v0.0.0-20160524151835-7d79101e329e/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf h1:+RRA9JqSOZFfKrOeqr2z77+8R2RKyh8PG66dcu1V0ck=
 github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
+github.com/google/gofuzz v1.0.0 h1:A8PeW59pxE9IoFRqBp37U+mSNaQoZ46F1f0f863XSXw=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d h1:7XGaL1e6bYS1yIonGp9761ExpPPV1ui0SAC59Yube9k=
@@ -60,6 +63,7 @@ github.com/imdario/mergo v0.3.7/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJ
 github.com/json-iterator/go v0.0.0-20180701071628-ab8a2e0c74be/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwKs=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
+github.com/json-iterator/go v1.1.7 h1:KfgG9LzI+pYjr4xvmz/5H4FXjokeP+rlHLhv3iH62Fo=
 github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
@@ -93,10 +97,12 @@ github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.4.1 h1:K0MGApIoQvMw27RTdJkPbr3JZ7DNbtxQNyi5STVM6Kw=
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+github.com/prometheus/common v0.6.0 h1:kRhiuYSXR3+uv2IbVbZhUxK5zVD/2pp3Gd2PpvPkpEo=
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+github.com/prometheus/procfs v0.0.3 h1:CTwfnzjQ+8dS6MhHHu4YswVAD99sL2wjPqP+VkURmKE=
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 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
@@ -116,13 +122,15 @@ golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20181025213731-e84da0312774/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67 h1:ng3VDlRp5/DHpSWl02R4rM9I+8M2rhmsuLwAMmkLQWE=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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 golang.org/x/net v0.0.0-20190206173232-65e2d4e15006/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190613194153-d28f0bde5980 h1:dfGZHvZk057jK2MCeWus/TowKpJ8y4AmooUzdBSR9GU=
 golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 h1:SVwTIAaPC2U/AvvLNZ2a7OVsmBpC8L5BlwK1whH3hm0=
@@ -138,6 +146,7 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3 h1:4y9KwBHBgBNwDbtu44R5o1fdOCQUEXhbk/P4A9WmJq0=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db h1:6/JqlYfC1CCaLnGceQTI+sDGhC9UBSPAsBqI0Gun6kU=
diff --git a/main.go b/main.go
