add alertId parameter in get chained alert API and paginate associated alerts if alertId param is mentioned

alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestGetWorkflowAlertsAction.kt

@@ -55,11 +55,16 @@ class RestGetWorkflowAlertsAction : BaseRestHandler() {
         val severityLevel = request.param("severityLevel", "ALL")
         val alertState = request.param("alertState", "ALL")
         val workflowId: String? = request.param("workflowIds")
+        val alertId: String? = request.param("alertIds")
         val getAssociatedAlerts: Boolean = request.param("getAssociatedAlerts", "false").toBoolean()
         val workflowIds = mutableListOf<String>()
         if (workflowId.isNullOrEmpty() == false) {
             workflowIds.add(workflowId)
         }
+        val alertIds = mutableListOf<String>()
+        if (alertId.isNullOrEmpty() == false) {
+            alertIds.add(alertId)
+        }
         val table = Table(
             sortOrder,
             sortString,
@@ -77,7 +82,8 @@ class RestGetWorkflowAlertsAction : BaseRestHandler() {
             associatedAlertsIndex = null,
             workflowIds = workflowIds,
             monitorIds = emptyList(),
-            getAssociatedAlerts = getAssociatedAlerts
+            getAssociatedAlerts = getAssociatedAlerts,
+            alertIds = alertIds
         )
         return RestChannelConsumer { channel ->
             client.execute(AlertingActions.GET_WORKFLOW_ALERTS_ACTION_TYPE, getWorkflowAlertsRequest, RestToXContentListener(channel))

alerting/src/main/kotlin/org/opensearch/alerting/transport/TransportGetWorkflowAlertsAction.kt

@@ -126,13 +126,18 @@ class TransportGetWorkflowAlertsAction @Inject constructor(
                         .field("trigger_name")
                 )
         }
+        // if alert id is mentioned we cannot set "from" field as it may not return id. we would be using it to paginate associated alerts
+        val from = if (getWorkflowAlertsRequest.alertIds.isNullOrEmpty())
+            tableProp.startIndex
+        else 0
+
         val searchSourceBuilder = SearchSourceBuilder()
             .version(true)
             .seqNoAndPrimaryTerm(true)
             .query(queryBuilder)
             .sort(sortBuilder)
             .size(tableProp.size)
-            .from(tableProp.startIndex)
+            .from(from)
 
         client.threadPool().threadContext.stashContext().use {
             scope.launch {
@@ -206,22 +211,42 @@ class TransportGetWorkflowAlertsAction @Inject constructor(
                 parseAlertsFromSearchResponse(response)
             )
             if (alerts.isNotEmpty() && getWorkflowAlertsRequest.getAssociatedAlerts == true)
-                getAssociatedAlerts(associatedAlerts, alerts, resolveAssociatedAlertsIndexName(getWorkflowAlertsRequest))
+                getAssociatedAlerts(
+                    associatedAlerts,
+                    alerts,
+                    resolveAssociatedAlertsIndexName(getWorkflowAlertsRequest),
+                    getWorkflowAlertsRequest
+                )
             actionListener.onResponse(GetWorkflowAlertsResponse(alerts, associatedAlerts, totalAlertCount))
         } catch (e: Exception) {
             actionListener.onFailure(AlertingException("Failed to get alerts", RestStatus.INTERNAL_SERVER_ERROR, e))
         }
     }
 
-    private suspend fun getAssociatedAlerts(associatedAlerts: MutableList<Alert>, alerts: MutableList<Alert>, alertIndex: String) {
+    private suspend fun getAssociatedAlerts(
+        associatedAlerts: MutableList<Alert>,
+        alerts: MutableList<Alert>,
+        alertIndex: String,
+        getWorkflowAlertsRequest: GetWorkflowAlertsRequest,
+    ) {
         try {
             val associatedAlertIds = mutableSetOf<String>()
             alerts.forEach { associatedAlertIds.addAll(it.associatedAlertIds) }
             if (associatedAlertIds.isEmpty()) return
             val queryBuilder = QueryBuilders.boolQuery()
+            val searchRequest = SearchRequest(alertIndex)
+            // if chained alert id param is non-null, paginate the associated alerts.
+            if (getWorkflowAlertsRequest.alertIds.isNullOrEmpty() == false) {
+                val tableProp = getWorkflowAlertsRequest.table
+                val sortBuilder = SortBuilders.fieldSort(tableProp.sortString)
+                    .order(SortOrder.fromString(tableProp.sortOrder))
+                if (!tableProp.missing.isNullOrBlank()) {
+                    sortBuilder.missing(tableProp.missing)
+                }
+                searchRequest.source().sort(sortBuilder).size(tableProp.size).from(tableProp.startIndex)
+            }
             queryBuilder.must(QueryBuilders.termsQuery("_id", associatedAlertIds))
             queryBuilder.must(QueryBuilders.termQuery(Alert.STATE_FIELD, Alert.State.AUDIT))
-            val searchRequest = SearchRequest(alertIndex)
             searchRequest.source().query(queryBuilder)
             val response: SearchResponse = client.suspendUntil { search(searchRequest, it) }
             associatedAlerts.addAll(parseAlertsFromSearchResponse(response))

alerting/src/test/kotlin/org/opensearch/alerting/AlertingRestTestCase.kt

@@ -795,9 +795,13 @@ abstract class AlertingRestTestCase : ODFERestTestCase() {
 
     protected fun getWorkflowAlerts(
         workflowId: String,
+        alertId: String? = "",
         getAssociatedAlerts: Boolean = true,
     ): Response {
-        return getWorkflowAlerts(client(), mutableMapOf(Pair("workflowIds", workflowId), Pair("getAssociatedAlerts", getAssociatedAlerts)))
+        return getWorkflowAlerts(
+            client(),
+            mutableMapOf(Pair("workflowIds", workflowId), Pair("getAssociatedAlerts", getAssociatedAlerts), Pair("alertIds", alertId!!))
+        )
     }
 
     protected fun getWorkflowAlerts(

alerting/src/test/kotlin/org/opensearch/alerting/MonitorDataSourcesIT.kt

@@ -6,6 +6,7 @@
 package org.opensearch.alerting
 
 import org.junit.Assert
+import org.opensearch.action.DocWriteRequest
 import org.opensearch.action.admin.cluster.state.ClusterStateRequest
 import org.opensearch.action.admin.indices.alias.Alias
 import org.opensearch.action.admin.indices.close.CloseIndexRequest
@@ -17,6 +18,8 @@ import org.opensearch.action.admin.indices.mapping.get.GetMappingsRequest
 import org.opensearch.action.admin.indices.mapping.put.PutMappingRequest
 import org.opensearch.action.admin.indices.open.OpenIndexRequest
 import org.opensearch.action.admin.indices.refresh.RefreshRequest
+import org.opensearch.action.bulk.BulkRequest
+import org.opensearch.action.bulk.BulkResponse
 import org.opensearch.action.fieldcaps.FieldCapabilitiesRequest
 import org.opensearch.action.index.IndexRequest
 import org.opensearch.action.search.SearchRequest
@@ -3691,7 +3694,7 @@ class MonitorDataSourcesIT : AlertingSingleNodeTestCase() {
         alertsIndex: String? = AlertIndices.ALERT_INDEX,
         executionId: String? = null,
         alertSize: Int,
-        workflowId: String
+        workflowId: String,
     ): GetAlertsResponse {
         val alerts = searchAlerts(monitorId, alertsIndex!!, executionId = executionId)
         assertEquals("Alert saved for test monitor", alertSize, alerts.size)
@@ -5637,4 +5640,83 @@ class MonitorDataSourcesIT : AlertingSingleNodeTestCase() {
         }
         Assert.assertTrue(alerts.stream().anyMatch { it.state == Alert.State.DELETED && chainedAlerts[0].id == it.id })
     }
+
+    fun `test get chained alerts with alertId paginating for associated alerts`() {
+        val docQuery1 = DocLevelQuery(query = "test_field_1:\"us-west-2\"", name = "3")
+        val docLevelInput1 = DocLevelMonitorInput("description", listOf(index), listOf(docQuery1))
+        val trigger1 = randomDocumentLevelTrigger(condition = ALWAYS_RUN)
+        var monitor1 = randomDocumentLevelMonitor(
+            inputs = listOf(docLevelInput1),
+            triggers = listOf(trigger1)
+        )
+        var monitor2 = randomDocumentLevelMonitor(
+            inputs = listOf(docLevelInput1),
+            triggers = listOf(trigger1)
+        )
+        val monitorResponse = createMonitor(monitor1)!!
+        val monitorResponse2 = createMonitor(monitor2)!!
+
+        val andTrigger = randomChainedAlertTrigger(
+            name = "1And2",
+            condition = Script("monitor[id=${monitorResponse.id}] && monitor[id=${monitorResponse2.id}]")
+        )
+        var workflow = randomWorkflow(
+            monitorIds = listOf(monitorResponse.id, monitorResponse2.id),
+            triggers = listOf(andTrigger)
+        )
+        val workflowResponse = upsertWorkflow(workflow)!!
+        val workflowById = searchWorkflow(workflowResponse.id)
+        val workflowId = workflowById!!.id
+        val testTime = DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(ZonedDateTime.now().truncatedTo(MILLIS))
+        val testDoc1 = """{
+            "message" : "This is an error from IAD region",
+            "source.ip.v6.v2" : 16644, 
+            "test_strict_date_time" : "$testTime",
+            "test_field_1" : "us-west-2"
+        }"""
+        var i = 1
+        val indexRequests = mutableListOf<IndexRequest>()
+        while (i++ < 300) {
+            indexRequests += IndexRequest(index).source(testDoc1, XContentType.JSON).id("$i").opType(DocWriteRequest.OpType.INDEX)
+        }
+        val bulkResponse: BulkResponse =
+            client().bulk(BulkRequest().add(indexRequests).setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE)).get()
+        if (bulkResponse.hasFailures()) {
+            fail("Bulk request to index to test index has failed")
+        }
+        var executeWorkflowResponse = executeWorkflow(workflowById, workflowId, false)!!
+        var res = getWorkflowAlerts(
+            workflowId = workflowId
+        )
+        Assert.assertTrue(executeWorkflowResponse.workflowRunResult.triggerResults[andTrigger.id]!!.triggered)
+        var chainedAlerts = res.alerts
+        Assert.assertTrue(chainedAlerts.size == 1)
+        Assert.assertEquals(res.associatedAlerts.size, 10)
+        var res100to200 = getWorkflowAlerts(
+            workflowId = workflowId,
+            alertIds = listOf(res.alerts[0].id),
+            table = Table("asc", "monitor_id", null, 100, 100, null)
+        )
+        Assert.assertEquals(res100to200.associatedAlerts.size, 100)
+        var res200to300 = getWorkflowAlerts(
+            workflowId = workflowId,
+            alertIds = listOf(res.alerts[0].id),
+            table = Table("asc", "monitor_id", null, 100, 201, null)
+        )
+        Assert.assertEquals(res200to300.associatedAlerts.size, 100)
+        var res0to99 = getWorkflowAlerts(
+            workflowId = workflowId,
+            alertIds = listOf(res.alerts[0].id),
+            table = Table("asc", "monitor_id", null, 100, 0, null)
+        )
+        Assert.assertEquals(res0to99.associatedAlerts.size, 100)
+
+        val ids100to200 = res100to200.associatedAlerts.stream().map { it.id }.collect(Collectors.toSet())
+        val idsSet0to99 = res0to99.associatedAlerts.stream().map { it.id }.collect(Collectors.toSet())
+        val idsSet200to300 = res200to300.associatedAlerts.stream().map { it.id }.collect(Collectors.toSet())
+
+        Assert.assertTrue(idsSet0to99.all { it !in ids100to200 })
+        Assert.assertTrue(idsSet0to99.all { it !in idsSet200to300 })
+        Assert.assertTrue(ids100to200.all { it !in idsSet200to300 })
+    }
 }

alerting/src/test/kotlin/org/opensearch/alerting/resthandler/WorkflowRestApiIT.kt

@@ -1101,7 +1101,7 @@ class WorkflowRestApiIT : AlertingRestTestCase() {
         assertTrue(
             (workflowTriggerResults[andTrigger.id] as Map<String, Any>)["triggered"] as Boolean
         )
-        val res = getWorkflowAlerts(workflowId, true)
+        val res = getWorkflowAlerts(workflowId = workflowId, getAssociatedAlerts = true)
         val getWorkflowAlerts = entityAsMap(res)
         Assert.assertTrue(getWorkflowAlerts.containsKey("alerts"))
         Assert.assertTrue(getWorkflowAlerts.containsKey("associatedAlerts"))
@@ -1113,6 +1113,18 @@ class WorkflowRestApiIT : AlertingRestTestCase() {
         val associatedAlerts = getWorkflowAlerts["associatedAlerts"] as List<HashMap<String, Any>>
         assertEquals(associatedAlerts.size, 2)
 
+        val res1 = getWorkflowAlerts(workflowId = workflowId, alertId = alerts[0]["id"].toString(), getAssociatedAlerts = true)
+        val getWorkflowAlerts1 = entityAsMap(res1)
+        Assert.assertTrue(getWorkflowAlerts1.containsKey("alerts"))
+        Assert.assertTrue(getWorkflowAlerts1.containsKey("associatedAlerts"))
+        val alerts1 = getWorkflowAlerts1["alerts"] as List<HashMap<String, Any>>
+        assertEquals(alerts1.size, 1)
+        Assert.assertEquals(alerts1[0]["execution_id"], executionId)
+        Assert.assertEquals(alerts1[0]["workflow_id"], workflowId)
+        Assert.assertEquals(alerts1[0]["monitor_id"], "")
+        val associatedAlerts1 = getWorkflowAlerts1["associatedAlerts"] as List<HashMap<String, Any>>
+        assertEquals(associatedAlerts1.size, 2)
+
         val getAlertsRes = getAlerts()
         val getAlertsMap = getAlertsRes.asMap()
         Assert.assertTrue(getAlertsMap.containsKey("alerts"))
@@ -1121,11 +1133,11 @@ class WorkflowRestApiIT : AlertingRestTestCase() {
         Assert.assertEquals(getAlertsAlerts[0]["execution_id"], executionId)
         Assert.assertEquals(getAlertsAlerts[0]["workflow_id"], workflowId)
         Assert.assertEquals(getAlertsAlerts[0]["monitor_id"], "")
-        Assert.assertEquals(getAlertsAlerts[0]["id"], alerts[0]["id"])
+        Assert.assertEquals(getAlertsAlerts[0]["id"], alerts1[0]["id"])
 
-        val ackRes = acknowledgeChainedAlerts(workflowId, alerts[0]["id"].toString())
+        val ackRes = acknowledgeChainedAlerts(workflowId, alerts1[0]["id"].toString())
         val acknowledgeChainedAlertsResponse = entityAsMap(ackRes)
         val acknowledged = acknowledgeChainedAlertsResponse["success"] as List<String>
-        Assert.assertEquals(acknowledged[0], alerts[0]["id"])
+        Assert.assertEquals(acknowledged[0], alerts1[0]["id"])
     }
 }

alerting/src/test/kotlin/org/opensearch/alerting/transport/AlertingSingleNodeTestCase.kt

@@ -283,19 +283,20 @@ abstract class AlertingSingleNodeTestCase : OpenSearchSingleNodeTestCase() {
         alertState: Alert.State? = Alert.State.ACTIVE,
         alertIndex: String? = "",
         associatedAlertsIndex: String? = "",
+        alertIds: List<String>? = emptyList(),
+        table: Table? = Table("asc", "monitor_id", null, 100, 0, null),
     ): GetWorkflowAlertsResponse {
-        val table = Table("asc", "monitor_id", null, 100, 0, null)
         return client().execute(
             AlertingActions.GET_WORKFLOW_ALERTS_ACTION_TYPE,
             GetWorkflowAlertsRequest(
-                table = table,
+                table = table!!,
                 severityLevel = "ALL",
                 alertState = alertState!!.name,
                 alertIndex = alertIndex,
                 associatedAlertsIndex = associatedAlertsIndex,
                 monitorIds = emptyList(),
                 workflowIds = listOf(workflowId),
-                alertIds = emptyList(),
+                alertIds = alertIds,
                 getAssociatedAlerts = getAssociatedAlerts!!
             )
         ).get()