add throttle on action level

alerting/src/main/kotlin/com/amazon/opendistroforelasticsearch/alerting/MonitorRunner.kt

@@ -51,6 +51,7 @@ import com.amazon.opendistroforelasticsearch.alerting.core.model.SearchInput
 import com.amazon.opendistroforelasticsearch.alerting.elasticapi.convertToMap
 import com.amazon.opendistroforelasticsearch.alerting.elasticapi.firstFailureOrNull
 import com.amazon.opendistroforelasticsearch.alerting.elasticapi.retry
+import com.amazon.opendistroforelasticsearch.alerting.model.ActionExecutionResult
 import org.apache.logging.log4j.LogManager
 import org.elasticsearch.ExceptionsHelper
 import org.elasticsearch.action.DocWriteRequest
@@ -193,7 +194,7 @@ class MonitorRunner(
             if (isTriggerActionable(triggerCtx, triggerResult)) {
                 val actionCtx = triggerCtx.copy(error = monitorResult.error ?: triggerResult.error)
                 for (action in trigger.actions) {
-                    triggerResult.actionResults[action.name] = runAction(action, actionCtx, dryrun)
+                    triggerResult.actionResults[action.id] = runAction(action, actionCtx, dryrun)
                 }
             }
 
@@ -219,22 +220,45 @@ class MonitorRunner(
     private fun composeAlert(ctx: TriggerExecutionContext, result: TriggerRunResult, alertError: AlertError?): Alert? {
         val currentTime = currentTime()
         val currentAlert = ctx.alert
+
+        val updatedActionExecutionResults = mutableListOf<ActionExecutionResult>()
+        val currentActionIds = mutableSetOf<String>()
+        if (currentAlert != null) {
+            for (actionExecutionResult in currentAlert.actionExecutionResults) {
+                val actionId = actionExecutionResult.actionId
+                currentActionIds.add(actionId)
+                val actionRunResult = result.actionResults[actionId]
+                when {
+                    actionRunResult == null -> updatedActionExecutionResults.add(actionExecutionResult)
+                    actionRunResult.throttled ->
+                        updatedActionExecutionResults.add(actionExecutionResult.copy(
+                                throttledCount = actionExecutionResult.throttledCount + 1))
+                    else -> updatedActionExecutionResults.add(actionExecutionResult.copy(lastExecutionTime = actionRunResult.executionTime))
+                }
+            }
+            updatedActionExecutionResults.addAll(result.actionResults.filter { it -> currentActionIds.contains(it.key) }
+                    .map { it -> ActionExecutionResult(it.key, it.value.executionTime, if (it.value.throttled) 1 else 0) })
+        } else {
+            updatedActionExecutionResults.addAll(result.actionResults.map { it -> ActionExecutionResult(it.key, it.value.executionTime,
+                    if (it.value.throttled) 1 else 0) })
+        }
+
         // Merge the alert's error message to the current alert's history
         val updatedHistory = currentAlert?.errorHistory.update(alertError)
         return if (alertError == null && !result.triggered) {
             currentAlert?.copy(state = COMPLETED, endTime = currentTime, errorMessage = null,
-                    errorHistory = updatedHistory)
+                    errorHistory = updatedHistory, actionExecutionResults = updatedActionExecutionResults)
         } else if (alertError == null && currentAlert?.isAcknowledged() == true) {
             null
         } else if (currentAlert != null) {
             val alertState = if (alertError == null) ACTIVE else ERROR
             currentAlert.copy(state = alertState, lastNotificationTime = currentTime, errorMessage = alertError?.message,
-                    errorHistory = updatedHistory)
+                    errorHistory = updatedHistory, actionExecutionResults = updatedActionExecutionResults)
         } else {
             val alertState = if (alertError == null) ACTIVE else ERROR
             Alert(monitor = ctx.monitor, trigger = ctx.trigger, startTime = currentTime,
                     lastNotificationTime = currentTime, state = alertState, errorMessage = alertError?.message,
-                    errorHistory = updatedHistory)
+                    errorHistory = updatedHistory, actionExecutionResults = updatedActionExecutionResults)
         }
     }
 
@@ -380,8 +404,24 @@ class MonitorRunner(
         return result.triggered && !suppress
     }
 
+    private fun isActionActionable(action: Action, alert: Alert?): Boolean {
+        if (alert == null) {
+            return true
+        }
+        if (action.throttleEnabled) {
+            val result = alert.actionExecutionResults.firstOrNull { r -> r.actionId == action.id }
+            val lastExecutionTime: Instant? = result?.lastExecutionTime
+            val throttledTimeBound = currentTime().minus(action.throttle!!.value!!.toLong(), action.throttle.unit)
+            return (lastExecutionTime == null || lastExecutionTime.isBefore(throttledTimeBound))
+        }
+        return true
+    }
+
     private fun runAction(action: Action, ctx: TriggerExecutionContext, dryrun: Boolean): ActionRunResult {
         return try {
+            if (!isActionActionable(action, ctx.alert)) {
+                return ActionRunResult(action.id, action.name, mapOf(), true, null, null)
+            }
             val actionOutput = mutableMapOf<String, String>()
             actionOutput[SUBJECT] = if (action.subjectTemplate != null) compileTemplate(action.subjectTemplate, ctx) else ""
             actionOutput[MESSAGE] = compileTemplate(action.messageTemplate, ctx)
@@ -392,9 +432,9 @@ class MonitorRunner(
                 var destination = getDestinationInfo(action.destinationId)
                 actionOutput[MESSAGE_ID] = destination.publish(actionOutput[SUBJECT], actionOutput[MESSAGE]!!)
             }
-            ActionRunResult(action.name, actionOutput, false, null)
+            ActionRunResult(action.id, action.name, actionOutput, false, currentTime(), null)
         } catch (e: Exception) {
-            ActionRunResult(action.name, mapOf(), false, e)
+            ActionRunResult(action.id, action.name, mapOf(), false, currentTime(), e)
         }
     }
 

alerting/src/main/kotlin/com/amazon/opendistroforelasticsearch/alerting/model/ActionExecutionResult.kt

@@ -0,0 +1,78 @@
+/*
+ *   Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License").
+ *   You may not use this file except in compliance with the License.
+ *   A copy of the License is located at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   or in the "license" file accompanying this file. This file is distributed
+ *   on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ *   express or implied. See the License for the specific language governing
+ *   permissions and limitations under the License.
+ */
+
+package com.amazon.opendistroforelasticsearch.alerting.model
+
+import com.amazon.opendistroforelasticsearch.alerting.elasticapi.instant
+import com.amazon.opendistroforelasticsearch.alerting.elasticapi.optionalTimeField
+import org.elasticsearch.common.xcontent.ToXContent
+import org.elasticsearch.common.xcontent.ToXContentObject
+import org.elasticsearch.common.xcontent.XContentBuilder
+import org.elasticsearch.common.xcontent.XContentParser
+import org.elasticsearch.common.xcontent.XContentParserUtils
+import java.io.IOException
+import java.lang.IllegalStateException
+import java.time.Instant
+
+/**
+ * When an alert triggered, the trigger's actions will be executed.
+ * Action execution result records action throttle result and is a part of Alert.
+ */
+data class ActionExecutionResult(
+    val actionId: String,
+    val lastExecutionTime: Instant?,
+    val throttledCount: Int = 0
+) : ToXContentObject {
+
+    override fun toXContent(builder: XContentBuilder, params: ToXContent.Params): XContentBuilder {
+        return builder.startObject()
+                .field(ACTION_ID_FIELD, actionId)
+                .optionalTimeField(LAST_EXECUTION_TIME_FIELD, lastExecutionTime)
+                .field(THROTTLED_COUNT_FIELD, throttledCount)
+                .endObject()
+    }
+
+    companion object {
+        const val ACTION_ID_FIELD = "action_id"
+        const val LAST_EXECUTION_TIME_FIELD = "last_execution_time"
+        const val THROTTLED_COUNT_FIELD = "throttled_count"
+
+        @JvmStatic
+        @Throws(IOException::class)
+        fun parse(xcp: XContentParser): ActionExecutionResult {
+            var actionId: String? = null
+            var throttledCount: Int = 0
+            var lastExecutionTime: Instant? = null
+
+            XContentParserUtils.ensureExpectedToken(XContentParser.Token.START_OBJECT, xcp.currentToken(), xcp::getTokenLocation)
+            while (xcp.nextToken() != XContentParser.Token.END_OBJECT) {
+                val fieldName = xcp.currentName()
+                xcp.nextToken()
+                when (fieldName) {
+                    ACTION_ID_FIELD -> actionId = xcp.text()
+                    THROTTLED_COUNT_FIELD -> throttledCount = xcp.intValue()
+                    LAST_EXECUTION_TIME_FIELD -> lastExecutionTime = xcp.instant()
+
+                    else -> {
+                        throw IllegalStateException("Unexpected field: $fieldName, while parsing action")
+                    }
+                }
+            }
+
+            requireNotNull(actionId) { "Must set action id" }
+            return ActionExecutionResult(actionId, lastExecutionTime, throttledCount)
+        }
+    }
+}

alerting/src/main/kotlin/com/amazon/opendistroforelasticsearch/alerting/model/Alert.kt

@@ -41,7 +41,8 @@ data class Alert(
     val acknowledgedTime: Instant? = null,
     val errorMessage: String? = null,
     val errorHistory: List<AlertError>,
-    val severity: String
+    val severity: String,
+    val actionExecutionResults: List<ActionExecutionResult>
 ) : ToXContent {
 
     init {
@@ -57,11 +58,12 @@ data class Alert(
         lastNotificationTime: Instant?,
         state: State = State.ACTIVE,
         errorMessage: String? = null,
-        errorHistory: List<AlertError> = mutableListOf()
+        errorHistory: List<AlertError> = mutableListOf(),
+        actionExecutionResults: List<ActionExecutionResult> = mutableListOf()
     ) : this(monitorId = monitor.id, monitorName = monitor.name, monitorVersion = monitor.version,
             triggerId = trigger.id, triggerName = trigger.name, state = state, startTime = startTime,
             lastNotificationTime = lastNotificationTime, errorMessage = errorMessage, errorHistory = errorHistory,
-            severity = trigger.severity)
+            severity = trigger.severity, actionExecutionResults = actionExecutionResults)
 
     enum class State {
         ACTIVE, ACKNOWLEDGED, COMPLETED, ERROR, DELETED
@@ -86,6 +88,7 @@ data class Alert(
         const val ERROR_MESSAGE_FIELD = "error_message"
         const val ALERT_HISTORY_FIELD = "alert_history"
         const val SEVERITY_FIELD = "severity"
+        const val ACTION_EXECUTION_RESULTS_FIELD = "action_execution_results"
 
         const val NO_ID = ""
         const val NO_VERSION = Versions.NOT_FOUND
@@ -115,6 +118,7 @@ data class Alert(
             var acknowledgedTime: Instant? = null
             var errorMessage: String? = null
             val errorHistory: MutableList<AlertError> = mutableListOf()
+            var actionExecutionResults: MutableList<ActionExecutionResult> = mutableListOf()
 
             ensureExpectedToken(XContentParser.Token.START_OBJECT, xcp.currentToken(), xcp::getTokenLocation)
             while (xcp.nextToken() != XContentParser.Token.END_OBJECT) {
@@ -140,6 +144,12 @@ data class Alert(
                         }
                     }
                     SEVERITY_FIELD -> severity = xcp.text()
+                    ACTION_EXECUTION_RESULTS_FIELD -> {
+                        ensureExpectedToken(XContentParser.Token.START_ARRAY, xcp.currentToken(), xcp::getTokenLocation)
+                        while (xcp.nextToken() != XContentParser.Token.END_ARRAY) {
+                            actionExecutionResults.add(ActionExecutionResult.parse(xcp))
+                        }
+                    }
                 }
             }
 
@@ -148,7 +158,8 @@ data class Alert(
                     triggerId = requireNotNull(triggerId), triggerName = requireNotNull(triggerName),
                     state = requireNotNull(state), startTime = requireNotNull(startTime), endTime = endTime,
                     lastNotificationTime = lastNotificationTime, acknowledgedTime = acknowledgedTime,
-                    errorMessage = errorMessage, errorHistory = errorHistory, severity = severity)
+                    errorMessage = errorMessage, errorHistory = errorHistory, severity = severity,
+                    actionExecutionResults = actionExecutionResults)
         }
     }
 
@@ -163,6 +174,7 @@ data class Alert(
                 .field(ERROR_MESSAGE_FIELD, errorMessage)
                 .field(ALERT_HISTORY_FIELD, errorHistory.toTypedArray())
                 .field(SEVERITY_FIELD, severity)
+                .field(ACTION_EXECUTION_RESULTS_FIELD, actionExecutionResults.toTypedArray())
                 .optionalTimeField(START_TIME_FIELD, startTime)
                 .optionalTimeField(LAST_NOTIFICATION_TIME_FIELD, lastNotificationTime)
                 .optionalTimeField(END_TIME_FIELD, endTime)

alerting/src/main/kotlin/com/amazon/opendistroforelasticsearch/alerting/model/MonitorRunResult.kt

@@ -100,17 +100,21 @@ data class TriggerRunResult(
 }
 
 data class ActionRunResult(
+    val actionId: String,
     val actionName: String,
     val output: Map<String, String>,
     val throttled: Boolean = false,
+    val executionTime: Instant? = null,
     val error: Exception? = null
 ) : ToXContent {
 
     override fun toXContent(builder: XContentBuilder, params: ToXContent.Params): XContentBuilder {
         return builder.startObject()
+                .field("id", actionId)
                 .field("name", actionName)
                 .field("output", output)
                 .field("throttled", throttled)
+                .field("executionTime", executionTime)
                 .field("error", error?.message)
                 .endObject()
     }

alerting/src/main/kotlin/com/amazon/opendistroforelasticsearch/alerting/model/action/Action.kt

@@ -15,6 +15,7 @@
 
 package com.amazon.opendistroforelasticsearch.alerting.model.action
 
+import org.elasticsearch.common.UUIDs
 import org.elasticsearch.common.xcontent.ToXContent
 import org.elasticsearch.common.xcontent.ToXContentObject
 import org.elasticsearch.common.xcontent.XContentBuilder
@@ -31,7 +32,10 @@ data class Action(
     val name: String,
     val destinationId: String,
     val subjectTemplate: Script?,
-    val messageTemplate: Script
+    val messageTemplate: Script,
+    val throttleEnabled: Boolean,
+    val throttle: Throttle?,
+    val id: String = UUIDs.base64UUID()
 ) : ToXContentObject {
 
     init {
@@ -43,10 +47,13 @@ data class Action(
 
     override fun toXContent(builder: XContentBuilder, params: ToXContent.Params): XContentBuilder {
         return builder.startObject()
+                .field(ID_FIELD, id)
                 .field(NAME_FIELD, name)
                 .field(DESTINATION_ID_FIELD, destinationId)
                 .field(SUBJECT_TEMPLATE_FIELD, subjectTemplate)
                 .field(MESSAGE_TEMPLATE_FIELD, messageTemplate)
+                .field(THROTTLE_ENABLED_FIELD, throttleEnabled)
+                .field(THROTTLE_FIELD, throttle)
                 .endObject()
     }
 
@@ -55,10 +62,13 @@ data class Action(
     }
 
     companion object {
+        const val ID_FIELD = "id"
         const val NAME_FIELD = "name"
         const val DESTINATION_ID_FIELD = "destination_id"
         const val SUBJECT_TEMPLATE_FIELD = "subject_template"
         const val MESSAGE_TEMPLATE_FIELD = "message_template"
+        const val THROTTLE_ENABLED_FIELD = "throttle_enabled"
+        const val THROTTLE_FIELD = "throttle"
         const val MUSTACHE = "mustache"
         const val SUBJECT = "subject"
         const val MESSAGE = "message"
@@ -67,29 +77,42 @@ data class Action(
         @JvmStatic
         @Throws(IOException::class)
         fun parse(xcp: XContentParser): Action {
+            var id = UUIDs.base64UUID() // assign a default action id if one is not specified
             lateinit var name: String
             lateinit var destinationId: String
             var subjectTemplate: Script? = null // subject template could be null for some destinations
             lateinit var messageTemplate: Script
+            var throttleEnabled = false
+            var throttle: Throttle? = null
 
             XContentParserUtils.ensureExpectedToken(XContentParser.Token.START_OBJECT, xcp.currentToken(), xcp::getTokenLocation)
             while (xcp.nextToken() != XContentParser.Token.END_OBJECT) {
                 val fieldName = xcp.currentName()
                 xcp.nextToken()
                 when (fieldName) {
+                    ID_FIELD -> id = xcp.text()
                     NAME_FIELD -> name = xcp.textOrNull()
                     DESTINATION_ID_FIELD -> destinationId = xcp.textOrNull()
                     SUBJECT_TEMPLATE_FIELD -> subjectTemplate = Script.parse(xcp, Script.DEFAULT_TEMPLATE_LANG)
                     MESSAGE_TEMPLATE_FIELD -> messageTemplate = Script.parse(xcp, Script.DEFAULT_TEMPLATE_LANG)
+                    THROTTLE_FIELD -> throttle = Throttle.parse(xcp)
+                    THROTTLE_ENABLED_FIELD -> {
+                        throttleEnabled = xcp.booleanValue()
+                    }
+
                     else -> {
                         throw IllegalStateException("Unexpected field: $fieldName, while parsing action")
                     }
                 }
             }
-            return Action(requireNotNull(name) { "Destination name is null" },
+
+            return Action(requireNotNull(name) { "Action name is null" },
                     requireNotNull(destinationId) { "Destination id is null" },
                     subjectTemplate,
-                    requireNotNull(messageTemplate) { "Destination message template is null" })
+                    requireNotNull(messageTemplate) { "Action message template is null" },
+                    throttleEnabled,
+                    throttle,
+                    id = requireNotNull(id))
         }
     }
 }