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index.js
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index.js
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"use strict";
const path = require("path");
const fs = require("fs");
const utils = require("./lib/utils");
const DependencyStore = require("./lib/DependencyStore");
const promisify = require("es6-promisify");
const readdir = promisify(fs.readdir);
const snakeToCamel = (string) => {
//const now = Date.now();
const out = string.replace(/(\-\w)/g, (m) => {
return m[1].toUpperCase();
});
//console.log("t ", (Date.now() - now), "\n");
return out;
};
class Depjector {
constructor() {
this.dependencyStore = new DependencyStore();
this.addDependency({name: "depjector", instance: this, autowired: false});
}
addByPath(dependencyPath) {
dependencyPath += "";
//const now = Date.now();
return new Promise((resolve, reject) => {
const before = this.dependencyStore.dependencies.length;
utils.getAllFiles(dependencyPath).then((files) => {
for (const file of files) {
const ext = path.extname(file);
if (ext === ".js") {
this.dependencyStore.add(file);
}
}
//console.log("p ", (Date.now() - now), "\n");
return resolve(this.dependencyStore.dependencies.length - before);
}).catch((err) => {
return reject(err);
});
});
}
addNodeModules(filter) {
filter = filter || [];
//const now = Date.now();
return new Promise((resolve, reject) => {
readdir("./node_modules").then((files) => {
let count = 0;
//console.log("oo ", (Date.now() - now), "\n");
const now1 = Date.now();
for (const file of files) {
if (file[0] !== "." && filter.indexOf(file) === -1) {
this.addDependency({name: snakeToCamel(file), path: file, autowired: false});
count += 1;
}
}
//console.log("ii ", (Date.now() - now1), "\n");
//console.log("n ", (Date.now() - now), "\n");
resolve(count);
}).catch((err) => {
reject(err);
});
});
}
addModuleList(nameArray) {
const args = [];
//const now = Date.now();
for (const name of nameArray) {
args.push({name: snakeToCamel(name), path: name, autowired: false});
}
//console.log("m ", (Date.now() - now), "\n");
return this.addDependencies(args);
}
addDependencies(dependencyArray) {
//const now = Date.now();
return new Promise((resolve, reject) => {
if (!utils.isArray(dependencyArray)) {
reject(new TypeError("dependencyArray isn't a array"));
}
for (const dependency of dependencyArray) {
this.addDependency(dependency);
}
//console.log("2 ", (Date.now() - now), "\n");
resolve();
});
}
addDependency(dependency) {
//const now = Date.now();
return new Promise((resolve, reject) => {
try {
this.dependencyStore.add(dependency);
} catch (e) {
return reject(e);
}
//console.log("d ", (Date.now() - now), "\n");
return resolve();
});
}
addPath(name, path) {
return this.addDependency({
name,
path,
autowired: false
});
}
addInstance(name, instance) {
return this.addDependency({
name,
instance,
autowired: false
});
}
setDependency(name, dependency) {
this.dependencyStore.set(name, dependency);
}
updateDependency(accessToken, cb) {
const dependency = this.dependencyStore.findOneByAccessToken(accessToken);
if (dependency) {
this._injectDependency(dependency, {}, [], cb);
}
}
getDependency(name, overwrites) {
return this._getDependency(name, overwrites, []);
}
_getDependency(name, overwrites, parentNames) {
// force string.
name += "";
const newParentNames = parentNames.slice();
newParentNames.push(name);
//const now = Date.now();
const dependency = this.dependencyStore.findOneByName(name);
const result = dependency ? this._injectDependency(dependency, overwrites, newParentNames) : undefined;
//console.log("g ", (Date.now() - now), "\n");
return result;
}
removeDependency(name) {
// force string.
name += "";
this.dependencyStore.removeByName(name);
}
executeService(serviceName) {
//const now = Date.now();
if (!serviceName || serviceName.indexOf(":") === -1) {
throw new Error("Format error.");
}
const serviceDependencies = this.dependencyStore.findAllByServiceName(serviceName);
if (serviceDependencies.length > 0) {
const results = [];
const methodName = serviceName.substr(serviceName.indexOf(":") + 1);
for (const dependency of serviceDependencies) {
const instance = this._injectDependency(dependency);
if (instance && instance[methodName]) {
const funcArgs = Array.prototype.slice.call(arguments, 1);
results.push(instance[methodName].apply(instance, funcArgs));
}
}
//console.log("e ", (Date.now() - now), "\n");
return results;
}
throw new Error("no services was found");
}
/**
* _injectDependency
* @param {Dependency} dependency
* @param {Object} overwrites
* @param {Array} parentNames
* @param {Function} cb
* @returns {Object}
*/
_injectDependency(dependency, overwrites, parentNames, cb) {
//const now = Date.now();
// if the user don't want DI on a module jump over.
if (!dependency.autowired) {
//console.log("i ", (Date.now() - now), "\n");
return dependency.instance;
}
overwrites = overwrites || {};
parentNames = parentNames || [];
// make a parameter list with the dependencies.
const params = [];
if (dependency.args.length > 0) {
for (const arg of dependency.args) {
if (parentNames.indexOf(arg) > -1) {
throw new Error(`dependency ${arg} can't depend on it self`);
} else if (arg === "accessToken") {
params.push(dependency.accessToken);
} else if (overwrites[arg]) {
params.push(overwrites[arg]);
} else {
params.push(this._getDependency(arg, undefined, parentNames));
}
}
}
if (cb) {
return cb.apply(undefined, params);
} else if (dependency.isClass) {
// make new object of the Class with the parameters
//console.log("i ", (Date.now() - now), "\n");
return new (Function.prototype.bind.apply(dependency.instance, [].concat([null], params)));
} else if (dependency.isFunction || dependency.isArrow) {
// call the function with the parameters
//console.log("i ", (Date.now() - now), "\n");
return dependency.instance.apply(undefined, params);
}
// if this is a object or simple type like string or number then return.
//console.log("i ", (Date.now() - now), "\n");
return dependency.instance;
}
}
module.exports = Depjector;