feat(api): add EC2 Auto Scaling groups to the cloud explorer

Create groups from a launch template (in the default subnets unless given),
change their minimum, desired and maximum capacity, replace or remove an
instance, and follow the launches and terminations TheCloud's reconciler makes.
Deleting a group terminates its instances. Scaling policies are not offered:
the runtime stores them but its alarms only drive ECS scaling.

packages/api/src/cloud-spi/autoScalingSchema.ts

@@ -0,0 +1,103 @@
+import type {CloudProvider, FieldSchema, ServiceSchema, TableColumnSchema} from './types'
+
+/** CreateAutoScalingGroup's name rule: 1 to 255 characters, no colon. */
+export const AUTO_SCALING_GROUP_NAME_PATTERN = '^[^:]{1,255}$'
+/** A capacity the console accepts; AWS's own ceiling is far above what a laptop can run. */
+export const AUTO_SCALING_MAX_INSTANCES = 20
+
+const groupColumns: TableColumnSchema[] = [
+    {name: 'name', label: 'Name'},
+    {name: 'capacity', label: 'Instances', path: 'metadata.capacity'},
+    {name: 'desired', label: 'Desired', path: 'metadata.desiredCapacity'},
+    {name: 'min', label: 'Min', path: 'metadata.minSize'},
+    {name: 'max', label: 'Max', path: 'metadata.maxSize'},
+    {name: 'launchTemplate', label: 'Launch template', path: 'metadata.launchTemplateName', emptyText: '—'},
+    {name: 'createdAt', label: 'Created', format: 'datetime'},
+]
+
+const groupFilters: FieldSchema[] = [{name: 'search', label: 'Search', type: 'text', required: false}]
+
+const capacity = {pattern: '^\\d{1,2}$', message: `Use a whole number from 0 to ${AUTO_SCALING_MAX_INSTANCES}`}
+
+export function awsAutoScalingSchema(): ServiceSchema {
+    return {
+        cloud: 'aws',
+        service: 'autoscaling',
+        displayName: 'EC2 Auto Scaling groups',
+        fields: [
+            {
+                name: 'name',
+                label: 'Name',
+                type: 'text',
+                required: true,
+                validation: {pattern: AUTO_SCALING_GROUP_NAME_PATTERN, message: 'Use up to 255 characters, without a colon'},
+            },
+            {
+                name: 'launchTemplate',
+                label: 'Launch template',
+                type: 'text',
+                required: true,
+                description: 'The name or ID (lt-…) of an EC2 launch template. New instances use its image and instance type.',
+            },
+            {
+                name: 'launchTemplateVersion',
+                label: 'Template version',
+                type: 'text',
+                required: false,
+                defaultValue: '$Latest',
+                description: 'A version number, $Latest or $Default.',
+                validation: {pattern: '^(\\d+|\\$Latest|\\$Default)$', message: 'Use a version number, $Latest or $Default'},
+            },
+            {name: 'minSize', label: 'Minimum', type: 'text', required: true, defaultValue: '1', validation: capacity},
+            {name: 'desiredCapacity', label: 'Desired', type: 'text', required: false, defaultValue: '1', validation: capacity, description: 'How many instances to run now. Between the minimum and the maximum.'},
+            {name: 'maxSize', label: 'Maximum', type: 'text', required: true, defaultValue: '2', validation: capacity},
+            {
+                name: 'subnets',
+                label: 'Subnets',
+                type: 'text',
+                required: false,
+                span: true,
+                description: 'Subnet IDs to launch into, separated by commas. Leave empty for the default subnets.',
+                validation: {pattern: '^\\s*subnet-[\\w-]+(\\s*,\\s*subnet-[\\w-]+)*\\s*$', message: 'Use subnet IDs separated by commas'},
+            },
+            {
+                name: 'targetGroupArns',
+                label: 'Target groups',
+                type: 'textarea',
+                required: false,
+                span: true,
+                description: 'Optional load balancer target group ARNs, one per line. Instances are registered with them as they launch.',
+            },
+            {
+                name: 'healthCheckType',
+                label: 'Health check',
+                type: 'select',
+                required: false,
+                defaultValue: 'EC2',
+                options: [
+                    {label: 'EC2 instance status', value: 'EC2'},
+                    {label: 'Load balancer health checks', value: 'ELB'},
+                ],
+            },
+        ],
+        actions: ['list', 'create', 'delete', 'inspect'],
+        capabilities: {
+            resourceActions: [
+                {name: 'list', label: 'List Auto Scaling groups', enabled: true, status: 'available', runtimeRequired: true},
+                {name: 'create', label: 'Create Auto Scaling group', enabled: true, status: 'available', runtimeRequired: true},
+                {name: 'delete', label: 'Delete group and its instances', enabled: true, status: 'available', runtimeRequired: true},
+                {name: 'inspect', label: 'Inspect Auto Scaling group', enabled: true, status: 'available', runtimeRequired: true},
+            ],
+            autoScalingActions: [
+                {name: 'setCapacity', label: 'Change minimum, desired and maximum', enabled: true, status: 'available', runtimeRequired: true},
+                {name: 'terminateInstance', label: 'Terminate an instance', enabled: true, status: 'available', runtimeRequired: true},
+            ],
+        },
+        filters: groupFilters,
+        columns: groupColumns,
+    }
+}
+
+export function autoScalingSchemaFor(cloud: CloudProvider): ServiceSchema | null {
+    return cloud === 'aws' ? awsAutoScalingSchema() : null
+}

packages/api/src/cloud-spi/serviceCatalog.ts

@@ -74,6 +74,13 @@ export const SERVICE_CATALOG = {
         order: 20,
     },
     serverless: {displayName: 'Serverless', iconKey: 'serverless', group: 'Compute', order: 30},
+    autoscaling: {
+        displayName: 'Auto Scaling',
+        displayNameByCloud: {aws: 'EC2 Auto Scaling'},
+        iconKey: 'autoscaling',
+        group: 'Compute',
+        order: 15,
+    },
     containers: {
         displayName: 'Containers',
         displayNameByCloud: {gcp: 'Cloud Run'},

packages/api/src/cloud-spi/types.ts

@@ -186,6 +186,7 @@ export type UserPoolActionName =
     | 'describeClient'
     | 'updateClientOAuth'
 export type DistributionActionName = 'setEnabled' | 'createInvalidation'
+export type AutoScalingActionName = 'setCapacity' | 'terminateInstance'
 export type CertificateActionName = 'download' | 'export' | 'revoke'
 export type MonitoringActionName = 'listMetrics' | 'getMetricData' | 'alarmHistory' | 'setAlarmState' | 'setAlarmActions'
 export type HttpApiActionName =
@@ -246,6 +247,7 @@ export interface ServiceSchema {
         kubernetesActions?: CapabilitySchema<KubernetesActionName>[]
         userPoolActions?: CapabilitySchema<UserPoolActionName>[]
         distributionActions?: CapabilitySchema<DistributionActionName>[]
+        autoScalingActions?: CapabilitySchema<AutoScalingActionName>[]
         certificateActions?: CapabilitySchema<CertificateActionName>[]
         monitoringActions?: CapabilitySchema<MonitoringActionName>[]
         /** API Gateway v2 (HTTP and WebSocket APIs): what the routes, stages and security panel can do. */
@@ -537,6 +539,13 @@ export type CertificateRevocationReason =
     | 'CESSATION_OF_OPERATION'
     | 'PRIVILEGE_WITHDRAWN'
 
+/** Any of the three may be left out to keep its current value. */
+export interface AutoScalingCapacityInput {
+    minSize?: number
+    desiredCapacity?: number
+    maxSize?: number
+}
+
 export interface DistributionInvalidation {
     id: string
     status: string
@@ -1204,6 +1213,9 @@ export interface CloudServiceAdapter {
     setAlarmState?(alarmName: string, state: AlarmStateValue, reason: string): Promise<void>
     setAlarmActionsEnabled?(alarmName: string, enabled: boolean): Promise<void>
     createDistributionInvalidation?(distributionId: string, paths: string[]): Promise<DistributionInvalidation>
+    setAutoScalingCapacity?(groupName: string, input: AutoScalingCapacityInput): Promise<CloudResource>
+    /** With `replace`, the group launches a new instance in its place; otherwise desired capacity drops by one. */
+    terminateAutoScalingInstance?(groupName: string, instanceId: string, replace: boolean): Promise<void>
     getCertificatePem?(certificateId: string): Promise<CertificatePem>
     exportCertificate?(certificateId: string, passphrase: string): Promise<ExportedCertificate>
     revokeCertificate?(certificateId: string, reason: CertificateRevocationReason): Promise<CloudResource>