cdk8s
Version:
This is the core library of Cloud Development Kit (CDK) for Kubernetes (cdk8s). cdk8s apps synthesize into standard Kubernetes manifests which can be applied to any Kubernetes cluster.
172 lines • 17.6 kB
JavaScript
;
var _a, _b;
Object.defineProperty(exports, "__esModule", { value: true });
exports.DependencyVertex = exports.DependencyGraph = void 0;
const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
/**
* Represents the dependency graph for a given Node.
*
* This graph includes the dependency relationships between all nodes in the
* node (construct) sub-tree who's root is this Node.
*
* Note that this means that lonely nodes (no dependencies and no dependants) are also included in this graph as
* childless children of the root node of the graph.
*
* The graph does not include cross-scope dependencies. That is, if a child on the current scope depends on a node
* from a different scope, that relationship is not represented in this graph.
*
*/
class DependencyGraph {
constructor(node) {
this._fosterParent = new DependencyVertex();
const nodes = {};
function putVertex(construct) {
nodes[construct.node.path] = new DependencyVertex(construct);
}
function getVertex(construct) {
return nodes[construct.node.path];
}
// create all vertices of the graph.
for (const n of node.findAll()) {
putVertex(n);
}
const deps = [];
for (const child of node.findAll()) {
for (const dep of child.node.dependencies) {
deps.push({ source: child, target: dep });
}
}
// create all the edges of the graph.
for (const dep of deps) {
if (!getVertex(dep.target)) {
// dont cross scope boundaries.
// since charts only renders its own children, this is ok and
// has the benefit of simplifying the graph. we should reconsider this behavior when moving
// to a more general purpose use-case.
continue;
}
const sourceDepNode = getVertex(dep.source);
const targetDepNode = getVertex(dep.target);
sourceDepNode.addChild(targetDepNode);
}
// create the root.
for (const n of Object.values(nodes)) {
if (n.inbound.length === 0) {
// orphans are dependency roots. lets adopt them!
this._fosterParent.addChild(n);
}
}
}
/**
* Returns the root of the graph.
*
* Note that this vertex will always have `null` as its `.value` since it is an artifical root
* that binds all the connected spaces of the graph.
*/
get root() {
return this._fosterParent;
}
/**
* @see Vertex.topology()
*/
topology() {
return this._fosterParent.topology();
}
}
exports.DependencyGraph = DependencyGraph;
_a = JSII_RTTI_SYMBOL_1;
DependencyGraph[_a] = { fqn: "cdk8s.DependencyGraph", version: "2.69.52" };
/**
* Represents a vertex in the graph.
*
* The value of each vertex is an `IConstruct` that is accessible via the `.value` getter.
*/
class DependencyVertex {
constructor(value = undefined) {
this._children = new Set();
this._parents = new Set();
this._value = value;
}
/**
* Returns the IConstruct this graph vertex represents.
*
* `null` in case this is the root of the graph.
*/
get value() {
return this._value;
}
/**
* Returns the children of the vertex (i.e dependencies)
*/
get outbound() {
return Array.from(this._children);
}
/**
* Returns the parents of the vertex (i.e dependants)
*/
get inbound() {
return Array.from(this._parents);
}
/**
* Returns a topologically sorted array of the constructs in the sub-graph.
*/
topology() {
const found = new Set();
const topology = [];
function visit(n) {
for (const c of n.outbound) {
visit(c);
}
if (!found.has(n)) {
topology.push(n);
found.add(n);
}
}
visit(this);
return topology.filter(d => d.value).map(d => d.value);
}
/**
* Adds a vertex as a dependency of the current node.
* Also updates the parents of `dep`, so that it contains this node as a parent.
*
* This operation will fail in case it creates a cycle in the graph.
*
* @param dep The dependency
*/
addChild(dep) {
const cycle = dep.findRoute(this);
if (cycle.length !== 0) {
cycle.push(dep);
throw new Error(`Dependency cycle detected: ${cycle.filter(d => d.value).map(d => d.value.node.path).join(' => ')}`);
}
this._children.add(dep);
dep.addParent(this);
}
addParent(dep) {
this._parents.add(dep);
}
findRoute(dst) {
const route = [];
visit(this);
return route;
function visit(n) {
route.push(n);
let found = false;
for (const c of n.outbound) {
if (c === dst) {
route.push(c);
return true;
}
found = visit(c);
}
if (!found) {
route.pop();
}
return found;
}
}
}
exports.DependencyVertex = DependencyVertex;
_b = JSII_RTTI_SYMBOL_1;
DependencyVertex[_b] = { fqn: "cdk8s.DependencyVertex", version: "2.69.52" };
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That is, if a child on the current scope depends on a node\n * from a different scope, that relationship is not represented in this graph.\n *\n */\nexport class DependencyGraph {\n\n  private readonly _fosterParent: DependencyVertex;\n\n  constructor(node: Node) {\n\n    this._fosterParent = new DependencyVertex();\n\n    const nodes: Record<string, DependencyVertex> = {};\n\n    function putVertex(construct: IConstruct) {\n      nodes[construct.node.path] = new DependencyVertex(construct);\n    }\n\n    function getVertex(construct: IConstruct): DependencyVertex {\n      return nodes[construct.node.path];\n    }\n\n    // create all vertices of the graph.\n    for (const n of node.findAll()) {\n      putVertex(n);\n    }\n\n    const deps = [];\n    for (const child of node.findAll()) {\n      for (const dep of child.node.dependencies) {\n        deps.push({ source: child, target: dep });\n      }\n    }\n\n    // create all the edges of the graph.\n    for (const dep of deps) {\n\n      if (!getVertex(dep.target)) {\n        // dont cross scope boundaries.\n        // since charts only renders its own children, this is ok and\n        // has the benefit of simplifying the graph. we should reconsider this behavior when moving\n        // to a more general purpose use-case.\n        continue;\n      }\n\n      const sourceDepNode = getVertex(dep.source);\n      const targetDepNode = getVertex(dep.target);\n\n      sourceDepNode.addChild(targetDepNode);\n\n    }\n\n    // create the root.\n    for (const n of Object.values(nodes)) {\n      if (n.inbound.length === 0) {\n        // orphans are dependency roots. lets adopt them!\n        this._fosterParent.addChild(n);\n      }\n    }\n\n  }\n\n  /**\n   * Returns the root of the graph.\n   *\n   * Note that this vertex will always have `null` as its `.value` since it is an artifical root\n   * that binds all the connected spaces of the graph.\n   */\n  public get root(): DependencyVertex {\n    return this._fosterParent;\n  }\n\n  /**\n   * @see Vertex.topology()\n   */\n  public topology(): IConstruct[] {\n    return this._fosterParent.topology();\n  }\n}\n\n/**\n * Represents a vertex in the graph.\n *\n * The value of each vertex is an `IConstruct` that is accessible via the `.value` getter.\n */\nexport class DependencyVertex {\n\n  private readonly _value: IConstruct | undefined;\n  private readonly _children: Set<DependencyVertex> = new Set<DependencyVertex>();\n  private readonly _parents: Set<DependencyVertex> = new Set<DependencyVertex>();\n\n  constructor(value: IConstruct | undefined = undefined) {\n    this._value = value;\n  }\n\n  /**\n   * Returns the IConstruct this graph vertex represents.\n   *\n   * `null` in case this is the root of the graph.\n   */\n  public get value(): IConstruct | undefined {\n    return this._value;\n  }\n\n  /**\n   * Returns the children of the vertex (i.e dependencies)\n   */\n  public get outbound(): Array<DependencyVertex> {\n    return Array.from(this._children);\n  }\n\n  /**\n   * Returns the parents of the vertex (i.e dependants)\n   */\n  public get inbound(): Array<DependencyVertex> {\n    return Array.from(this._parents);\n  }\n\n  /**\n   * Returns a topologically sorted array of the constructs in the sub-graph.\n   */\n  public topology(): IConstruct[] {\n\n    const found = new Set<DependencyVertex>();\n    const topology: DependencyVertex[] = [];\n\n    function visit(n: DependencyVertex) {\n      for (const c of n.outbound) {\n        visit(c);\n      }\n      if (!found.has(n)) {\n        topology.push(n);\n        found.add(n);\n      }\n    }\n\n    visit(this);\n\n    return topology.filter(d => d.value).map(d => d.value!);\n\n  }\n\n  /**\n   * Adds a vertex as a dependency of the current node.\n   * Also updates the parents of `dep`, so that it contains this node as a parent.\n   *\n   * This operation will fail in case it creates a cycle in the graph.\n   *\n   * @param dep The dependency\n   */\n  public addChild(dep: DependencyVertex) {\n\n    const cycle: DependencyVertex[] = dep.findRoute(this);\n    if (cycle.length !== 0) {\n      cycle.push(dep);\n      throw new Error(`Dependency cycle detected: ${cycle.filter(d => d.value).map(d => d.value!.node.path).join(' => ')}`);\n    }\n\n    this._children.add(dep);\n    dep.addParent(this);\n  }\n\n  private addParent(dep: DependencyVertex) {\n    this._parents.add(dep);\n  }\n\n  private findRoute(dst: DependencyVertex): DependencyVertex[] {\n\n    const route: DependencyVertex[] = [];\n    visit(this);\n    return route;\n\n    function visit(n: DependencyVertex): boolean {\n      route.push(n);\n      let found = false;\n      for (const c of n.outbound) {\n        if (c === dst) {\n          route.push(c);\n          return true;\n        }\n        found = visit(c);\n      }\n      if (!found) {\n        route.pop();\n      }\n      return found;\n\n    }\n\n  }\n}\n"]}