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utils.js
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utils.js
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const { join } = require("path");
const { isEmpty, path } = require("ramda");
const { Graph, alg } = require("graphlib");
const traverse = require("traverse");
const { utils } = require("@serverless/core");
const { trackComponent } = require("@webiny/tracking");
const { red } = require("chalk");
const debug = require("debug");
const getOutputs = allComponents => {
const outputs = {};
for (const alias in allComponents) {
outputs[alias] = allComponents[alias].outputs;
}
return outputs;
};
const resolveObject = (object, context) => {
const regex = /\${(\w*:?[\w\d.-]+)}/g;
const resolvedObject = traverse(object).forEach(function(value) {
const matches = typeof value === "string" ? value.match(regex) : null;
if (matches) {
let newValue = value;
for (const match of matches) {
const propPath = match.substring(2, match.length - 1).split(".");
const propValue = path(propPath, context);
if (propValue === undefined) {
throw Error(`invalid reference ${match}`);
}
if (match === value) {
newValue = propValue;
} else if (typeof propValue === "string") {
newValue = newValue.replace(match, propValue);
} else {
throw Error(`the referenced substring is not a string`);
}
}
this.update(newValue);
}
});
return resolvedObject;
};
const validateGraph = graph => {
const isAcyclic = alg.isAcyclic(graph);
if (!isAcyclic) {
const cycles = alg.findCycles(graph);
let msg = ["Your template has circular dependencies:"];
cycles.forEach((cycle, index) => {
let fromAToB = cycle.join(" --> ");
fromAToB = `${(index += 1)}. ${fromAToB}`;
const fromBToA = cycle.reverse().join(" <-- ");
const padLength = fromAToB.length + 4;
msg.push(fromAToB.padStart(padLength));
msg.push(fromBToA.padStart(padLength));
}, cycles);
msg = msg.join("\n");
throw new Error(msg);
}
};
const getTemplate = async inputs => {
const template = inputs.template || {};
if (typeof template === "string") {
if (
(!utils.isJsonPath(template) && !utils.isYamlPath(template)) ||
!(await utils.fileExists(template))
) {
throw Error("the referenced template path does not exist");
}
return utils.readFile(template);
} else if (typeof template !== "object") {
throw Error(
"the template input could either be an object, or a string path to a template file"
);
}
return template;
};
const resolveTemplate = (inputs, template) => {
const regex = /\${(\w*:?[\w\d.-]+)}/g;
let variableResolved = false;
const resolvedTemplate = traverse(template).forEach(function(value) {
const matches = typeof value === "string" ? value.match(regex) : null;
if (matches) {
let newValue = value;
for (const match of matches) {
// If ${cli.env} was matched, `propPath` will be ['cli', 'env']
const propPath = match.substring(2, match.length - 1).split(".");
const topLevelProp = propPath[0];
if (/\${env\.(\w*:?[\w\d.-]+)}/g.test(match)) {
// This block handles references to `env` variables
newValue = process.env[propPath[1]];
variableResolved = true;
} else if (/\${cli\.(\w*:?[\w\d.-]+)}/g.test(match)) {
// This block handles handles references to CLI parameters (--env, etc.)
newValue = value.replace(match, inputs[propPath[1]]);
variableResolved = true;
} else {
// This block handles references to component output
if (!template[topLevelProp]) {
throw Error(`invalid reference ${match}`);
}
if (!template[topLevelProp].component) {
variableResolved = true;
const propValue = path(propPath, template);
if (propValue === undefined) {
throw Error(`invalid reference ${match}`);
}
if (match === value) {
newValue = propValue;
} else if (typeof propValue === "string") {
newValue = newValue.replace(match, propValue);
} else {
throw Error(`the referenced substring is not a string`);
}
}
}
}
this.update(newValue);
}
});
if (variableResolved) {
return resolveTemplate(inputs, resolvedTemplate);
}
return resolvedTemplate;
};
const getAllComponents = (obj = {}) => {
const allComponents = {};
const options = { paths: [process.cwd()] };
for (const key in obj) {
if (obj[key] && obj[key].component) {
let componentPath = obj[key].component;
if (componentPath.startsWith(".")) {
componentPath = join(process.cwd(), componentPath);
}
const resolvedPath = require.resolve(componentPath, options);
allComponents[key] = {
path: resolvedPath,
inputs: obj[key].inputs || {}
};
}
}
return allComponents;
};
const setDependencies = allComponents => {
const regex = /\${(\w*:?[\w\d.-]+)}/g;
for (const alias in allComponents) {
const dependencies = traverse(allComponents[alias].inputs).reduce(function(accum, value) {
const matches = typeof value === "string" ? value.match(regex) : null;
if (matches) {
for (const match of matches) {
const referencedComponent = match.substring(2, match.length - 1).split(".")[0];
if (!allComponents[referencedComponent]) {
throw Error(
`the referenced component in expression ${match} does not exist`
);
}
if (!accum.includes(referencedComponent)) {
accum.push(referencedComponent);
}
}
}
return accum;
}, []);
allComponents[alias].dependencies = dependencies;
}
return allComponents;
};
const createGraph = allComponents => {
const graph = new Graph();
for (const alias in allComponents) {
graph.setNode(alias, allComponents[alias]);
}
for (const alias in allComponents) {
const { dependencies } = allComponents[alias];
if (!isEmpty(dependencies)) {
for (const dependency of dependencies) {
graph.setEdge(alias, dependency);
}
}
}
validateGraph(graph);
return graph;
};
const executeGraph = async (allComponents, graph, instance) => {
const leaves = graph.sinks();
const templateDebug = instance.context.instance.debug;
if (isEmpty(leaves)) {
return allComponents;
}
for (const alias of leaves) {
const componentData = graph.node(alias);
const component = await instance.load(componentData.path, alias);
component.context.instance.debug = debug(`webiny:${alias}`);
const availableOutputs = getOutputs(allComponents);
const inputs = resolveObject(allComponents[alias].inputs, availableOutputs);
instance.context.status("Deploying", alias);
try {
allComponents[alias].outputs = (await component(inputs)) || {};
instance.context.instance.debug = templateDebug;
await trackComponent({ context: instance.context, component: componentData.path });
} catch (err) {
instance.context.log(`An error occurred during deployment of ${red(alias)}`);
console.log();
console.log(red(err));
console.log();
process.exit(1);
}
graph.removeNode(alias);
}
return executeGraph(allComponents, graph, instance);
};
const syncState = async (allComponents, instance) => {
const templateDebug = instance.context.instance.debug;
for (const alias in instance.state.components || {}) {
if (!allComponents[alias]) {
try {
const component = await instance.load(instance.state.components[alias], alias);
component.context.instance.debug = debug(`webiny:${alias}`);
instance.context.status("Removing", alias);
await component.remove();
instance.context.instance.debug = templateDebug;
trackComponent({
context: instance.context,
component: instance.state.components[alias],
method: "remove"
});
} catch (e) {
instance.context.log(`An error occurred while removing ${alias}: ${e.stack}`);
}
}
}
instance.state.components = {};
for (const alias in allComponents) {
instance.state.components[alias] = allComponents[alias].path;
}
await instance.save();
};
module.exports = {
getTemplate,
resolveTemplate,
getAllComponents,
setDependencies,
createGraph,
executeGraph,
syncState,
getOutputs
};