feat: add option to cache resolved output values

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-a/config.yml

@@ -0,0 +1 @@
+commandRole: arn:aws:iam::{{ var.ACCOUNT_1_ID }}:role/OrganizationAccountAccessRole

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-a/stack1.yml

@@ -0,0 +1,2 @@
+regions: us-east-1
+template: stack1.yml

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-a/stack2.yml

@@ -0,0 +1,11 @@
+regions: eu-west-1
+template: stack2.yml
+parameters:
+  Code:
+    resolver: external-stack-output
+    stack: account-a-stack1
+    region: us-east-1
+    output: MyCode
+    confidential: true
+    cache: true
+depends: /account-a/stack1.yml

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-b/config.yml

@@ -0,0 +1 @@
+commandRole: arn:aws:iam::{{ var.ACCOUNT_2_ID }}:role/OrganizationAccountAccessRole

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-b/stack3.yml

@@ -0,0 +1,19 @@
+regions: us-east-1
+template: stack3.yml
+parameters:
+  Code:
+    resolver: external-stack-output
+    stack: account-a-stack1
+    output: MyCode
+    commandRole: arn:aws:iam::{{ var.ACCOUNT_1_ID }}:role/OrganizationAccountAccessRole
+    cache: true
+  Code2:
+    resolver: external-stack-output
+    stack: account-c-stack4
+    output: MyCode
+    commandRole: arn:aws:iam::{{ var.ACCOUNT_3_ID }}:role/OrganizationAccountAccessRole
+    region: eu-north-1
+    cache: true
+depends:
+  - /account-a/stack1.yml
+  - /account-c/stack4.yml

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-b/stack5.yml

@@ -0,0 +1,19 @@
+regions: us-east-1
+template: stack5.yml
+parameters:
+  Code3:
+    resolver: external-stack-output
+    stack: account-c-stack4
+    output: MyCode
+    commandRole: arn:aws:iam::{{ var.ACCOUNT_3_ID }}:role/OrganizationAccountAccessRole
+    region: eu-north-1
+    cache: true
+  Code4:
+    resolver: external-stack-output
+    stack: account-a-stack1
+    output: MyCode
+    commandRole: arn:aws:iam::{{ var.ACCOUNT_1_ID }}:role/OrganizationAccountAccessRole
+    cache: true
+depends:
+  - /account-a/stack1.yml
+  - /account-c/stack4.yml

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-c/config.yml

@@ -0,0 +1 @@
+commandRole: arn:aws:iam::{{ var.ACCOUNT_3_ID }}:role/OrganizationAccountAccessRole

integration-test/configs/resolvers/external-stack-output-with-cache/stacks/account-c/stack4.yml

@@ -0,0 +1,2 @@
+regions: eu-north-1
+template: stack4.yml

integration-test/configs/resolvers/external-stack-output-with-cache/templates/stack1.yml

@@ -0,0 +1,8 @@
+Resources:
+  LogGroup:
+    Type: AWS::Logs::LogGroup
+    Properties: {}
+Outputs:
+  MyCode:
+    Description: Code
+    Value: 123456789

integration-test/configs/resolvers/external-stack-output-with-cache/templates/stack2.yml

@@ -0,0 +1,9 @@
+Parameters:
+  Code:
+    Type: String
+    Description: Code
+Resources:
+  LogGroup:
+    Type: AWS::Logs::LogGroup
+    Properties:
+      LogGroupName: !Sub log-group-${Code}

integration-test/configs/resolvers/external-stack-output-with-cache/templates/stack3.yml

@@ -0,0 +1,16 @@
+Parameters:
+  Code:
+    Type: String
+    Description: Code
+    AllowedValues:
+      - "123456789"
+  Code2:
+    Type: String
+    Description: Code
+    AllowedValues:
+      - Reggae
+Resources:
+  LogGroup:
+    Type: AWS::Logs::LogGroup
+    Properties:
+      LogGroupName: !Sub log-group-${Code}-${Code2}

integration-test/configs/resolvers/external-stack-output-with-cache/templates/stack4.yml

@@ -0,0 +1,8 @@
+Resources:
+  LogGroup:
+    Type: AWS::Logs::LogGroup
+    Properties: {}
+Outputs:
+  MyCode:
+    Description: Code
+    Value: Reggae

integration-test/configs/resolvers/external-stack-output-with-cache/templates/stack5.yml

@@ -0,0 +1,16 @@
+Parameters:
+  Code3:
+    Type: String
+    Description: Code
+    AllowedValues:
+      - Reggae
+  Code4:
+    Type: String
+    Description: Code
+    AllowedValues:
+      - "123456789"
+Resources:
+  LogGroup:
+    Type: AWS::Logs::LogGroup
+    Properties:
+      LogGroupName: !Sub log-group-${Code3}-${Code4}-3

integration-test/test/resolvers/external-stack-output-with-cache.test.ts

@@ -0,0 +1,46 @@
+/**
+ * @testenv-recycler-count 3
+ */
+
+import {
+  executeDeployStacksCommand,
+  executeUndeployStacksCommand,
+} from "../../src/commands/stacks.js"
+
+const projectDir = `${process.cwd()}/integration-test/configs/resolvers/external-stack-output-with-cache`
+const stacks = [
+  {
+    stackName: "account-a-stack1",
+    stackPath: "/account-a/stack1.yml/us-east-1",
+  },
+  {
+    stackName: "account-a-stack2",
+    stackPath: "/account-a/stack2.yml/eu-west-1",
+  },
+  {
+    stackName: "account-b-stack3",
+    stackPath: "/account-b/stack3.yml/us-east-1",
+  },
+  {
+    stackName: "account-b-stack5",
+    stackPath: "/account-b/stack5.yml/us-east-1",
+  },
+  {
+    stackName: "account-c-stack4",
+    stackPath: "/account-c/stack4.yml/eu-north-1",
+  },
+]
+
+describe("External stack output resolver with cache", () => {
+  test("Deploy", () =>
+    executeDeployStacksCommand({ projectDir, logLevel: "debug" })
+      .expectCommandToSucceed()
+      .expectStackCreateSuccess(...stacks)
+      .assert())
+
+  test("Undeploy", () =>
+    executeUndeployStacksCommand({ projectDir })
+      .expectCommandToSucceed()
+      .expectStackDeleteSuccess(...stacks)
+      .assert())
+})

package.json

@@ -45,7 +45,7 @@
     "build": "tsc",
     "test": "NODE_OPTIONS='--experimental-vm-modules --no-warnings' jest --selectProjects test --maxWorkers=2 --ci --verbose",
     "integration-test": "NODE_OPTIONS='--experimental-vm-modules --no-warnings' jest --selectProjects integration-test --maxWorkers=5 --ci --verbose",
-    "single-integration-test": "NODE_OPTIONS='--experimental-vm-modules --no-warnings' jest --selectProjects integration-test --ci --verbose -i integration-test/test/emit/emit-multiple.test.ts",
+    "single-integration-test": "NODE_OPTIONS='--experimental-vm-modules --no-warnings' jest --selectProjects integration-test --ci --verbose -i integration-test/test/resolvers/external-stack-output-with-cache.test.ts",
     "clean": "rm -f package-lock.json && rm -rf node_modules && rm -rf dist",
     "clean-build": "npm run clean && npm install && npm run build",
     "depcheck": "depcheck"

src/caches/cache.ts

@@ -1,5 +1,17 @@
 export interface Cache {
-  readonly get: (key: string) => Promise<string | undefined>
-  readonly put: (key: string, value: string) => Promise<void>
+  readonly get: (key: string) => Promise<unknown>
+  readonly put: (key: string, value: unknown) => Promise<void>
   readonly reset: () => Promise<void>
 }
+
+export const inMemoryCache = () => {
+  const cache = new Map<string, unknown>()
+
+  return {
+    get: async (key: string) => cache.get(key),
+    put: async (key: string, value: unknown) => {
+      cache.set(key, value)
+    },
+    reset: async () => cache.clear(),
+  }
+}

src/context/stacks-context.ts

@@ -3,6 +3,7 @@ import { StackGroup, StackGroupPath } from "../stacks/stack-group.js"
 import { InternalStack, Stack, StackPath } from "../stacks/stack.js"
 import { TemplateEngine } from "../templating/template-engine.js"
 import { CommandContext, InternalCommandContext } from "./command-context.js"
+import { Cache } from "../caches/cache.js"
 
 /**
  * Provides access to the current stack context and
@@ -20,6 +21,11 @@ export interface StacksContext extends CommandContext {
    */
   readonly templateEngine: TemplateEngine
 
+  /**
+   * Shared cache for values that needs to be persisted for the duration of the current operation.
+   */
+  readonly cache: Cache
+
   /**
    * Return a stack by exact path or throw an error if no stack is found.
    * The stack path can be relative if stackGroupPath is given.
@@ -40,6 +46,7 @@ export interface StacksContext extends CommandContext {
 }
 
 export interface InternalStacksContext extends InternalCommandContext {
+  readonly cache: Cache
   readonly concurrentStacks: number
   readonly credentialManager: CredentialManager
   readonly templateEngine: TemplateEngine