[CSGI-2056 ] Address Service Alert Grouping parameters config permadiff

pagerduty/resource_pagerduty_service.go

@@ -28,6 +28,21 @@ func resourcePagerDutyService() *schema.Resource {
 					return fmt.Errorf("general urgency cannot be set for a use_support_hours incident urgency rule type")
 				}
 			}
+
+			// Due to alert_grouping_parameters.type = null is a valid configuration
+			// for disabling Service's Alert Grouping configuration and having an
+			// empty alert_grouping_parameters.config block is also valid, API ignore
+			// this input fields, and turns out that API response for Service
+			// configuration doesn't bring a representation of this HCL, which leads
+			// to a permadiff, described in
+			// https://github.com/PagerDuty/terraform-provider-pagerduty/issues/700
+			//
+			// So, bellow is the formated representation alert_grouping_parameters
+			// value when this permadiff appears and must be ignored.
+			ignoreThisAlertGroupingParamsConfigDiff := `[]interface {}{map[string]interface {}{"config":[]interface {}{interface {}(nil)}, "type":""}}`
+			if agpdiff, ok := diff.Get("alert_grouping_parameters").([]interface{}); ok && diff.NewValueKnown("alert_grouping_parameters") && fmt.Sprintf("%#v", agpdiff) == ignoreThisAlertGroupingParamsConfigDiff {
+				diff.Clear("alert_grouping_parameters")
+			}
 			return nil
 		},
 		Importer: &schema.ResourceImporter{
@@ -96,6 +111,7 @@ func resourcePagerDutyService() *schema.Resource {
 						"config": {
 							Type:     schema.TypeList,
 							Optional: true,
+							Computed: true,
 							MaxItems: 1,
 							Elem: &schema.Resource{
 								Schema: map[string]*schema.Schema{
@@ -584,6 +600,7 @@ func expandAlertGroupingParameters(v interface{}) *pagerduty.AlertGroupingParame
 
 	// For Intelligent grouping type, config is null
 	alertGroupingParameters.Config = nil
+	log.Printf("[MYDEBUG] config: %#v", alertGroupingParameters.Config)
 	if groupingType == "content_based" || groupingType == "time" {
 		alertGroupingParameters.Config = expandAlertGroupingConfig(riur["config"], groupingType)
 	}

pagerduty/resource_pagerduty_service_test.go

@@ -419,6 +419,30 @@ func TestAccPagerDutyService_AlertContentGrouping(t *testing.T) {
 						"pagerduty_service.foo", "incident_urgency_rule.0.type", "constant"),
 				),
 			},
+			{
+				Config: testAccCheckPagerDutyServiceConfigWithAlertIntelligentGroupingOmittingConfig(username, email, escalationPolicy, service),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckPagerDutyServiceExists("pagerduty_service.foo"),
+					resource.TestCheckResourceAttr(
+						"pagerduty_service.foo", "name", service),
+					resource.TestCheckResourceAttr(
+						"pagerduty_service.foo", "alert_grouping_parameters.0.type", "intelligent"),
+					resource.TestCheckNoResourceAttr(
+						"pagerduty_service.foo", "alert_grouping_parameters.0.config.0"),
+				),
+			},
+			{
+				Config: testAccCheckPagerDutyServiceConfigWithAlertIntelligentGroupingTypeNullEmptyConfigConfig(username, email, escalationPolicy, service),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckPagerDutyServiceExists("pagerduty_service.foo"),
+					resource.TestCheckResourceAttr(
+						"pagerduty_service.foo", "name", service),
+					resource.TestCheckNoResourceAttr(
+						"pagerduty_service.foo", "alert_grouping_parameters.0.type"),
+					resource.TestCheckNoResourceAttr(
+						"pagerduty_service.foo", "alert_grouping_parameters.0.config.0"),
+				),
+			},
 		},
 	})
 }
@@ -1384,6 +1408,83 @@ resource "pagerduty_service" "foo" {
 `, username, email, escalationPolicy, service)
 }
 
+func testAccCheckPagerDutyServiceConfigWithAlertIntelligentGroupingOmittingConfig(username, email, escalationPolicy, service string) string {
+	return fmt.Sprintf(`
+resource "pagerduty_user" "foo" {
+	name        = "%s"
+	email       = "%s"
+	color       = "green"
+	role        = "user"
+	job_title   = "foo"
+	description = "foo"
+}
+
+resource "pagerduty_escalation_policy" "foo" {
+	name        = "%s"
+	description = "bar"
+	num_loops   = 2
+	rule {
+		escalation_delay_in_minutes = 10
+		target {
+			type = "user_reference"
+			id   = pagerduty_user.foo.id
+		}
+	}
+}
+
+resource "pagerduty_service" "foo" {
+	name                    = "%s"
+	description             = "bar"
+	auto_resolve_timeout    = 1800
+	acknowledgement_timeout = 1800
+	escalation_policy       = pagerduty_escalation_policy.foo.id
+	alert_creation          = "create_alerts_and_incidents"
+	alert_grouping_parameters {
+        type = "intelligent"
+    }
+}
+`, username, email, escalationPolicy, service)
+}
+
+func testAccCheckPagerDutyServiceConfigWithAlertIntelligentGroupingTypeNullEmptyConfigConfig(username, email, escalationPolicy, service string) string {
+	return fmt.Sprintf(`
+resource "pagerduty_user" "foo" {
+	name        = "%s"
+	email       = "%s"
+	color       = "green"
+	role        = "user"
+	job_title   = "foo"
+	description = "foo"
+}
+
+resource "pagerduty_escalation_policy" "foo" {
+	name        = "%s"
+	description = "bar"
+	num_loops   = 2
+	rule {
+		escalation_delay_in_minutes = 10
+		target {
+			type = "user_reference"
+			id   = pagerduty_user.foo.id
+		}
+	}
+}
+
+resource "pagerduty_service" "foo" {
+	name                    = "%s"
+	description             = "bar"
+	auto_resolve_timeout    = 1800
+	acknowledgement_timeout = 1800
+	escalation_policy       = pagerduty_escalation_policy.foo.id
+	alert_creation          = "create_alerts_and_incidents"
+	alert_grouping_parameters {
+        type = null
+        config {}
+    }
+}
+`, username, email, escalationPolicy, service)
+}
+
 func testAccCheckPagerDutyServiceConfigWithAutoPauseNotificationsParameters(username, email, escalationPolicy, service string) string {
 	return fmt.Sprintf(`
 resource "pagerduty_user" "foo" {