Define CloudWatch Alarm Payload structure

events/sns.go

@@ -30,3 +30,59 @@ type SNSEntity struct {
 	UnsubscribeURL    string                 `json:"UnsubscribeUrl"`
 	Subject           string                 `json:"Subject"`
 }
+
+type CloudWatchAlarmSnsPayload struct {
+	AlarmName        string                 `json:"AlarmName"`
+	AlarmDescription string                 `json:"AlarmDescription"`
+	AWSAccountId     string                 `json:"AWSAccountId"`
+	NewStateValue    string                 `json:"NewStateValue"`
+	NewStateReason   string                 `json:"NewStateReason"`
+	StateChangeTime  string                 `json:"StateChangeTime"`
+	Region           string                 `json:"Region"`
+	AlarmArn         string                 `json:"AlarmArn"`
+	OldStateValue    string                 `json:"OldStateValue"`
+	Trigger          CloudWatchAlarmTrigger `json:"Trigger"`
+}
+
+type CloudWatchAlarmTrigger struct {
+	Period                           int64                        `json:"Period"`
+	EvaluationPeriods                int64                        `json:"EvaluationPeriods"`
+	ComparisonOperator               string                       `json:"ComparisonOperator"`
+	Threshold                        float64                      `json:"Threshold"`
+	TreatMissingData                 string                       `json:"TreatMissingData"`
+	EvaluateLowSampleCountPercentile string                       `json:"EvaluateLowSampleCountPercentile"`
+	Metrics                          []*CloudWatchMetricDataQuery `json:"Metrics,omitempty"`
+	MetricName                       string                       `json:"MetricName,omitempty"`
+	Namespace                        string                       `json:"Namespace,omitempty"`
+	StatisticType                    string                       `json:"StatisticType,omitempty"`
+	Statistic                        string                       `json:"Statistic,omitempty"`
+	Unit                             string                       `json:"Unit,omitempty"`
+	Dimensions                       []*CloudWatchDimension       `json:"Dimensions,omitempty"`
+}
+
+type CloudWatchMetricDataQuery struct {
+	Expression *string               `json:"Expression,omitempty"`
+	Id         *string               `json:"Id"`
+	Label      *string               `json:"Label,omitempty"`
+	MetricStat *CloudWatchMetricStat `json:"MetricStat,omitempty"`
+	Period     *int64                `json:"Period,omitempty"`
+	ReturnData *bool                 `json:"ReturnData,omitempty"`
+}
+
+type CloudWatchMetricStat struct {
+	Metric *CloudWatchMetric `json:"Metric"`
+	Period *int64            `json:"Period"`
+	Stat   *string           `json:"Stat"`
+	Unit   *string           `json:"Unit,omitempty"`
+}
+
+type CloudWatchMetric struct {
+	Dimensions []*CloudWatchDimension `json:"Dimensions,omitempty"`
+	MetricName *string                `json:"MetricName,omitempty"`
+	Namespace  *string                `json:"Namespace,omitempty"`
+}
+
+type CloudWatchDimension struct {
+	Name  *string `json:"name"`
+	Value *string `json:"value"`
+}

events/sns_test.go

@@ -33,3 +33,32 @@ func TestSnsEventMarshaling(t *testing.T) {
 func TestSnsMarshalingMalformedJson(t *testing.T) {
 	test.TestMalformedJson(t, SNSEvent{})
 }
+
+func TestCloudWatchAlarmSnsPayloadMarshaling(t *testing.T) {
+	// 1. read JSON from file
+	inputJson := test.ReadJSONFromFile(t, "./testdata/cloudwatch-alarm-sns-payload-single-metric.json")
+
+	// 2. de-serialize into Go object
+	var inputEvent SNSEvent
+	if err := json.Unmarshal(inputJson, &inputEvent); err != nil {
+		t.Errorf("could not unmarshal event. details: %v", err)
+	}
+
+	// 3.retrieve message from the Go object
+	var message = inputEvent.Records[0].SNS.Message
+
+	// 4. de-serialize message into Go object
+	var inputCloudWatchPayload CloudWatchAlarmSnsPayload
+	if err := json.Unmarshal([]byte(message), &inputCloudWatchPayload); err != nil {
+		t.Errorf("could not unmarshal event. details: %v", err)
+	}
+
+	// 5. serialize message to JSON
+	outputJson, err := json.Marshal(inputCloudWatchPayload)
+	if err != nil {
+		t.Errorf("could not marshal event. details: %v", err)
+	}
+
+	// 4. check result
+	assert.JSONEq(t, string(message), string(outputJson))
+}

events/testdata/cloudwatch-alarm-sns-payload-multiple-metrics.json

@@ -0,0 +1,22 @@
+{
+    "Records": [
+        {
+            "EventSource": "aws:sns",
+            "EventVersion": "1.0",
+            "EventSubscriptionArn": "arn:aws:sns:EXAMPLE",
+            "Sns": {
+                "Type": "Notification",
+                "MessageId": "95df01b4-ee98-5cb9-9903-4c221d41eb5e",
+                "TopicArn": "arn:aws:sns:EXAMPLE",
+                "Subject": "TestInvoke",
+                "Message": "{\"AlarmName\":\"EXAMPLE\",\"AlarmDescription\":\"EXAMPLE\",\"AWSAccountId\":\"EXAMPLE\",\"NewStateValue\":\"ALARM\",\"NewStateReason\":\"Threshold Crossed: 1 out of the last 1 datapoints [1234.0 (06/03/15 17:43:27)] was greater than the threshold (0.0) (minimum 1 datapoint for OK -> ALARM transition).\",\"StateChangeTime\":\"2015-06-03T17:43:27.123+0000\",\"Region\":\"EXAMPLE\",\"AlarmArn\":\"arn:aws:cloudwatch:REGION:ACCOUNT_NUMBER:alarm:EXAMPLE\",\"OldStateValue\":\"INSUFFICIENT_DATA\",\"Trigger\":{\"Period\":60,\"EvaluationPeriods\":1,\"ComparisonOperator\":\"GreaterThanThreshold\",\"Threshold\":0.0,\"TreatMissingData\":\"- TreatMissingData:                    missing\",\"EvaluateLowSampleCountPercentile\":\"\",\"Metrics\":[{\"Expression\":\"m1*1\",\"Id\":\"e1\",\"Label\":\"Expression1\",\"ReturnData\":true},{\"Id\":\"m1\",\"MetricStat\":{\"Metric\":{\"Dimensions\":[{\"value\":\"TestInstance\",\"name\":\"InstanceId\"}],\"MetricName\":\"NetworkOut\",\"Namespace\":\"AWS/EC2\"},\"Period\":60,\"Stat\":\"Average\"},\"ReturnData\":false}]}}",
+                "Timestamp": "2015-06-03T17:43:27.123Z",
+                "SignatureVersion": "1",
+                "Signature": "EXAMPLE",
+                "SigningCertUrl": "EXAMPLE",
+                "UnsubscribeUrl": "EXAMPLE",
+                "MessageAttributes": {}
+            }
+        }
+    ]
+}

events/testdata/cloudwatch-alarm-sns-payload-single-metric.json

@@ -0,0 +1,22 @@
+{
+    "Records": [
+        {
+            "EventSource": "aws:sns",
+            "EventVersion": "1.0",
+            "EventSubscriptionArn": "arn:aws:sns:us-east-2: 594917905844:Default_CloudWatch_Alarms_Topic_Test: 872f5b40-db58-4161-94af-4fbc7f613012",
+            "Sns": {
+                "Type": "Notification",
+                "MessageId": "48c234a8-0bf8-56aa-82bd-63fcf9fc8cdc",
+                "TopicArn": "arn:aws:sns:us-east-2: 594917905844:Default_CloudWatch_Alarms_Topic_Test",
+                "Subject": "ALARM: \"test-alarm\" in US East (Ohio)",
+                "Message": "{\"AlarmName\": \"EXAMPLE\",\"AlarmDescription\": \"EXAMPLE\",\"AWSAccountId\": \"123456789012\",\"NewStateValue\": \"ALARM\",\"NewStateReason\": \"Threshold Crossed: 1 out of the last 1 datapoints [1234.0 (06/03/15 17:43:27)] was greater than the threshold (0.0) (minimum 1 datapoint for OK -> ALARM transition).\",\"StateChangeTime\": \"2015-06-03T17:43:27.123+0000\",\"Region\": \"EXAMPLE\",\"AlarmArn\": \"arn:aws:cloudwatch:REGION:ACCOUNT_NUMBER:alarm:EXAMPLE\",\"OldStateValue\": \"INSUFFICIENT_DATA\",\"Trigger\": {\"MetricName\": \"NetworkOut\",\"Namespace\": \"AWS/EC2\",\"StatisticType\": \"Statistic\",\"Statistic\": \"AVERAGE\",\"Unit\": \"Bytes\",\"Dimensions\": [{\"value\": \"TestInstance\",\"name\": \"InstanceId\"}],\"Period\": 60,\"EvaluationPeriods\": 1,\"ComparisonOperator\": \"GreaterThanThreshold\",\"Threshold\": 0.0,\"TreatMissingData\": \"- TreatMissingData:                    missing\",\"EvaluateLowSampleCountPercentile\": \"\"}}",
+                "Timestamp": "2015-06-03T17:43:27.123Z",
+                "SignatureVersion": "1",
+                "Signature": "RENXziJT8pGBhsGjpAOCAnoJ97DxibakoUk/hv71cxGUM2bSROtYAzCb1UNSvWsfonFXH4tf+aJsjKEkoDRCgnbft9rjohgW52L6GXEGpL0mgdoBF08EzRrLk/xCqoOvMzTP1W0gM2hiwyCmLmQvUw21gCU8RYZrk2LvFQ91sdXqneRcifrRBEyk92SZ60JHjMatnxWHFXOe71Ca8aPou0Qu1V76Sn1/J6hYq5tujMWohWBkPnqWXOvLPRJsrh6HnvVYhfBVUiE2QIEg3G9++0+fQoGHExAfrleK/1afmDNBhh27d3TKFRSOG78wF/NG2HeyYgg4ocQ6F6VwchPRew==",
+                "SigningCertUrl": "https: //sns.us-east-2.amazonaws.com/SimpleNotificationService-a86cb10b4e1f29c941702d737128f7b6.pem",
+                "UnsubscribeUrl": "https: //sns.us-east-2.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-east-2:594917905844:Default_CloudWatch_Alarms_Topic_Test:872f5b40-db58-4161-94af-4fbc7f613012",
+                "MessageAttributes": {}
+            }
+        }
+    ]
+}

go.mod

@@ -3,6 +3,7 @@ module github.com/aws/aws-lambda-go
 go 1.12
 
 require (
-	github.com/stretchr/testify v1.4.0
+	github.com/aws/aws-sdk-go v1.31.12
+	github.com/stretchr/testify v1.5.1
 	github.com/urfave/cli/v2 v2.1.1
 )

go.sum

@@ -1,8 +1,14 @@
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/aws/aws-sdk-go v1.31.12 h1:SxRRGyhlCagI0DYkhOg+FgdXGXzRTE3vEX/gsgFaiKQ=
+github.com/aws/aws-sdk-go v1.31.12/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
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+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jmespath/go-jmespath v0.3.0 h1:OS12ieG61fsCg5+qLJ+SsW9NicxNkg3b25OyT2yCeUc=
+github.com/jmespath/go-jmespath v0.3.0/go.mod h1:9QtRXoHjLGCJ5IBSaohpXITPlowMeeYCZ7fLUTSywik=
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@@ -12,8 +18,14 @@ github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeV
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+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
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