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@aws-cdk/core

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AWS Cloud Development Kit Core Library

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.addDependency = void 0; const stack_1 = require("./stack"); const stage_1 = require("./stage"); const util_1 = require("./util"); /** * Adds a dependency between two resources or stacks, across stack and nested * stack boundaries. * * The algorithm consists of: * - Try to find the deepest common stack between the two elements * - If there isn't a common stack, it means the elements belong to two * disjoined stack-trees and therefore we apply the dependency at the * assembly/app level between the two topl-level stacks. * - If we did find a common stack, we apply the dependency as a CloudFormation * "DependsOn" between the resources that "represent" our source and target * either directly or through the AWS::CloudFormation::Stack resources that * "lead" to them. * * @param source The source resource/stack (the depedent) * @param target The target resource/stack (the dependency) * @param reason Optional resource to associate with the dependency for * diagnostics */ function addDependency(source, target, reason) { if (source === target) { return; } const sourceStack = stack_1.Stack.of(source); const targetStack = stack_1.Stack.of(target); const sourceStage = stage_1.Stage.of(sourceStack); const targetStage = stage_1.Stage.of(targetStack); if (sourceStage !== targetStage) { // eslint-disable-next-line max-len throw new Error(`You cannot add a dependency from '${source.node.path}' (in ${describeStage(sourceStage)}) to '${target.node.path}' (in ${describeStage(targetStage)}): dependency cannot cross stage boundaries`); } // find the deepest common stack between the two elements const sourcePath = util_1.pathToTopLevelStack(sourceStack); const targetPath = util_1.pathToTopLevelStack(targetStack); const commonStack = util_1.findLastCommonElement(sourcePath, targetPath); // if there is no common stack, then define a assembly-level dependency // between the two top-level stacks if (!commonStack) { const topLevelSource = sourcePath[0]; // first path element is the top-level stack const topLevelTarget = targetPath[0]; topLevelSource._addAssemblyDependency(topLevelTarget, reason); return; } // assertion: at this point if source and target are stacks, both are nested stacks. // since we have a common stack, it is impossible that both are top-level // stacks, so let's examine the two cases where one of them is top-level and // the other is nested. // case 1 - source is top-level and target is nested: this implies that // `target` is a direct or indirect nested stack of `source`, and an explicit // dependency is not required because nested stacks will always be deployed // before their parents. if (commonStack === source) { return; } // case 2 - source is nested and target is top-level: this implies that // `source` is a direct or indirect nested stack of `target`, and this is not // possible (nested stacks cannot depend on their parents). if (commonStack === target) { throw new Error(`Nested stack '${sourceStack.node.path}' cannot depend on a parent stack '${targetStack.node.path}': ${reason}`); } // we have a common stack from which we can reach both `source` and `target` // now we need to find two resources which are defined directly in this stack // and which can "lead us" to the source/target. const sourceResource = resourceInCommonStackFor(source); const targetResource = resourceInCommonStackFor(target); sourceResource._addResourceDependency(targetResource); function resourceInCommonStackFor(element) { const resource = stack_1.Stack.isStack(element) ? element.nestedStackResource : element; if (!resource) { throw new Error('assertion failure'); // see "assertion" above } const resourceStack = stack_1.Stack.of(resource); // we reached a resource defined in the common stack if (commonStack === resourceStack) { return resource; } return resourceInCommonStackFor(resourceStack); } } exports.addDependency = addDependency; /** * Return a string representation of the given assembler, for use in error messages */ function describeStage(assembly) { if (!assembly) { return 'an unrooted construct tree'; } if (!assembly.parentStage) { return 'the App'; } return `Stage '${assembly.node.path}'`; } //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"deps.js","sourceRoot":"","sources":["deps.ts"],"names":[],"mappings":";;;AACA,mCAAgC;AAChC,mCAAgC;AAChC,iCAAkF;AAIlF;;;;;;;;;;;;;;;;;;GAkBG;AACH,SAAgB,aAAa,CAAoB,MAAS,EAAE,MAAS,EAAE,MAAe;IACpF,IAAI,MAAM,KAAK,MAAM,EAAE;QACrB,OAAO;KACR;IAED,MAAM,WAAW,GAAG,aAAK,CAAC,EAAE,CAAC,MAAM,CAAC,CAAC;IACrC,MAAM,WAAW,GAAG,aAAK,CAAC,EAAE,CAAC,MAAM,CAAC,CAAC;IAErC,MAAM,WAAW,GAAG,aAAK,CAAC,EAAE,CAAC,WAAW,CAAC,CAAC;IAC1C,MAAM,WAAW,GAAG,aAAK,CAAC,EAAE,CAAC,WAAW,CAAC,CAAC;IAC1C,IAAI,WAAW,KAAK,WAAW,EAAE;QAC/B,mCAAmC;QACnC,MAAM,IAAI,KAAK,CAAC,qCAAqC,MAAM,CAAC,IAAI,CAAC,IAAI,SAAS,aAAa,CAAC,WAAW,CAAC,SAAS,MAAM,CAAC,IAAI,CAAC,IAAI,SAAS,aAAa,CAAC,WAAW,CAAC,6CAA6C,CAAC,CAAC;KACpN;IAED,yDAAyD;IACzD,MAAM,UAAU,GAAG,0BAAU,CAAC,WAAW,CAAC,CAAC;IAC3C,MAAM,UAAU,GAAG,0BAAU,CAAC,WAAW,CAAC,CAAC;IAC3C,MAAM,WAAW,GAAG,4BAAqB,CAAC,UAAU,EAAE,UAAU,CAAC,CAAC;IAElE,uEAAuE;IACvE,mCAAmC;IACnC,IAAI,CAAC,WAAW,EAAE;QAChB,MAAM,cAAc,GAAG,UAAU,CAAC,CAAC,CAAC,CAAC,CAAC,4CAA4C;QAClF,MAAM,cAAc,GAAG,UAAU,CAAC,CAAC,CAAC,CAAC;QACrC,cAAc,CAAC,sBAAsB,CAAC,cAAc,EAAE,MAAM,CAAC,CAAC;QAC9D,OAAO;KACR;IAED,oFAAoF;IACpF,yEAAyE;IACzE,4EAA4E;IAC5E,uBAAuB;IAEvB,uEAAuE;IACvE,6EAA6E;IAC7E,2EAA2E;IAC3E,wBAAwB;IACxB,IAAI,WAAW,KAAK,MAAM,EAAE;QAC1B,OAAO;KACR;IAED,uEAAuE;IACvE,6EAA6E;IAC7E,2DAA2D;IAC3D,IAAI,WAAW,KAAK,MAAM,EAAE;QAC1B,MAAM,IAAI,KAAK,CAAC,iBAAiB,WAAW,CAAC,IAAI,CAAC,IAAI,sCAAsC,WAAW,CAAC,IAAI,CAAC,IAAI,MAAM,MAAM,EAAE,CAAC,CAAC;KAClI;IAED,4EAA4E;IAC5E,6EAA6E;IAC7E,gDAAgD;IAChD,MAAM,cAAc,GAAG,wBAAwB,CAAC,MAAM,CAAC,CAAC;IACxD,MAAM,cAAc,GAAG,wBAAwB,CAAC,MAAM,CAAC,CAAC;IACxD,cAAc,CAAC,sBAAsB,CAAC,cAAc,CAAC,CAAC;IAEtD,SAAS,wBAAwB,CAAC,OAA4B;QAC5D,MAAM,QAAQ,GAAG,aAAK,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC,CAAC,CAAC,OAAO,CAAC,mBAAmB,CAAC,CAAC,CAAC,OAAO,CAAC;QAChF,IAAI,CAAC,QAAQ,EAAE;YACb,MAAM,IAAI,KAAK,CAAC,mBAAmB,CAAC,CAAC,CAAC,wBAAwB;SAC/D;QAED,MAAM,aAAa,GAAG,aAAK,CAAC,EAAE,CAAC,QAAQ,CAAC,CAAC;QAEzC,oDAAoD;QACpD,IAAI,WAAW,KAAK,aAAa,EAAE;YACjC,OAAO,QAAQ,CAAC;SACjB;QAED,OAAO,wBAAwB,CAAC,aAAa,CAAC,CAAC;IACjD,CAAC;AACH,CAAC;AAvED,sCAuEC;AAED;;GAEG;AACH,SAAS,aAAa,CAAC,QAA2B;IAChD,IAAI,CAAC,QAAQ,EAAE;QAAE,OAAO,4BAA4B,CAAC;KAAE;IACvD,IAAI,CAAC,QAAQ,CAAC,WAAW,EAAE;QAAE,OAAO,SAAS,CAAC;KAAE;IAChD,OAAO,UAAU,QAAQ,CAAC,IAAI,CAAC,IAAI,GAAG,CAAC;AACzC,CAAC","sourcesContent":["import { CfnResource } from './cfn-resource';\nimport { Stack } from './stack';\nimport { Stage } from './stage';\nimport { findLastCommonElement, pathToTopLevelStack as pathToRoot } from './util';\n\ntype Element = CfnResource | Stack;\n\n/**\n * Adds a dependency between two resources or stacks, across stack and nested\n * stack boundaries.\n *\n * The algorithm consists of:\n * - Try to find the deepest common stack between the two elements\n * - If there isn't a common stack, it means the elements belong to two\n *   disjoined stack-trees and therefore we apply the dependency at the\n *   assembly/app level between the two topl-level stacks.\n * - If we did find a common stack, we apply the dependency as a CloudFormation\n *   \"DependsOn\" between the resources that \"represent\" our source and target\n *   either directly or through the AWS::CloudFormation::Stack resources that\n *   \"lead\" to them.\n *\n * @param source The source resource/stack (the depedent)\n * @param target The target resource/stack (the dependency)\n * @param reason Optional resource to associate with the dependency for\n * diagnostics\n */\nexport function addDependency<T extends Element>(source: T, target: T, reason?: string) {\n  if (source === target) {\n    return;\n  }\n\n  const sourceStack = Stack.of(source);\n  const targetStack = Stack.of(target);\n\n  const sourceStage = Stage.of(sourceStack);\n  const targetStage = Stage.of(targetStack);\n  if (sourceStage !== targetStage) {\n    // eslint-disable-next-line max-len\n    throw new Error(`You cannot add a dependency from '${source.node.path}' (in ${describeStage(sourceStage)}) to '${target.node.path}' (in ${describeStage(targetStage)}): dependency cannot cross stage boundaries`);\n  }\n\n  // find the deepest common stack between the two elements\n  const sourcePath = pathToRoot(sourceStack);\n  const targetPath = pathToRoot(targetStack);\n  const commonStack = findLastCommonElement(sourcePath, targetPath);\n\n  // if there is no common stack, then define a assembly-level dependency\n  // between the two top-level stacks\n  if (!commonStack) {\n    const topLevelSource = sourcePath[0]; // first path element is the top-level stack\n    const topLevelTarget = targetPath[0];\n    topLevelSource._addAssemblyDependency(topLevelTarget, reason);\n    return;\n  }\n\n  // assertion: at this point if source and target are stacks, both are nested stacks.\n  // since we have a common stack, it is impossible that both are top-level\n  // stacks, so let's examine the two cases where one of them is top-level and\n  // the other is nested.\n\n  // case 1 - source is top-level and target is nested: this implies that\n  // `target` is a direct or indirect nested stack of `source`, and an explicit\n  // dependency is not required because nested stacks will always be deployed\n  // before their parents.\n  if (commonStack === source) {\n    return;\n  }\n\n  // case 2 - source is nested and target is top-level: this implies that\n  // `source` is a direct or indirect nested stack of `target`, and this is not\n  // possible (nested stacks cannot depend on their parents).\n  if (commonStack === target) {\n    throw new Error(`Nested stack '${sourceStack.node.path}' cannot depend on a parent stack '${targetStack.node.path}': ${reason}`);\n  }\n\n  // we have a common stack from which we can reach both `source` and `target`\n  // now we need to find two resources which are defined directly in this stack\n  // and which can \"lead us\" to the source/target.\n  const sourceResource = resourceInCommonStackFor(source);\n  const targetResource = resourceInCommonStackFor(target);\n  sourceResource._addResourceDependency(targetResource);\n\n  function resourceInCommonStackFor(element: CfnResource | Stack): CfnResource {\n    const resource = Stack.isStack(element) ? element.nestedStackResource : element;\n    if (!resource) {\n      throw new Error('assertion failure'); // see \"assertion\" above\n    }\n\n    const resourceStack = Stack.of(resource);\n\n    // we reached a resource defined in the common stack\n    if (commonStack === resourceStack) {\n      return resource;\n    }\n\n    return resourceInCommonStackFor(resourceStack);\n  }\n}\n\n/**\n * Return a string representation of the given assembler, for use in error messages\n */\nfunction describeStage(assembly: Stage | undefined): string {\n  if (!assembly) { return 'an unrooted construct tree'; }\n  if (!assembly.parentStage) { return 'the App'; }\n  return `Stage '${assembly.node.path}'`;\n}\n"]}