@decisit/chirujs v2.0.3
ChiruJS
Asynchronous service micro library (no runtime dependencies)
Documentation: https://decisit.com/community/chirujs/
Installation
ChiruJS is available via NPM:
$ npm install --save @decisit/chirujs
Source code
ChiruJS source code is available on GitHub:
https://github.com/decisit/ChiruJS
Your first service
const Service = require('@decisit/chirujs').Service;
class MyAwesomeService extends Service {
async execute() {
return (this.params.n * 2);
}
}
new MyAwesomeService({ n: 21 }).run().then((result) => {
console.log(result.success); // true
console.log(result.output); // 42
});
Requiring parameters
const Service = require('@decisit/chirujs').Service;
class MyAwesomeService extends Service {
async prepare() {
this.n = this.requireParam('n');
}
async execute() {
return (this.n * 2);
}
}
new MyAwesomeService().run().then((result) => { // Not supplying 'n'
console.log(result.output); // This will never happen
}).catch((error) => {
console.log(error.result.success); // false
console.log(error.result.messages); // [{ scope: "base", message: "MissingParameter: n" }]
});
Requiring parameters (more)
const Service = require('@decisit/chirujs').Service;
class MyAwesomeService extends Service {
async prepare() {
this.n = this.requireParam('p1', { default: 12 });
this.n = this.requireParam('p2', { default() { return (34) } });
this.n = this.requireParam('p3', { of: Number });
this.n = this.requireParam('p4', { allowNull: false });
}
}
Requiring parameters (rules)
requireParam
fails if:
- parameter name is not in
params
(hasOwnProperty
) andoptions.default
is absent - parameter value is
null
/undefined
,options.allowNull
isfalse
andoptions.default
is absent options.of
is present and parameter value is not instance of it
Try/catch
const Service = require('@decisit/chirujs').Service;
class MyAwesomeService extends Service {
async prepare() {
this.n = this.requireParam('n');
}
async execute() {
return (this.n * 2);
}
}
try {
const result = await new MyAwesomeService().run();
// ...
} catch (error) {
console.log(error.error); // original error
console.log(error.result); // result
}
Subservice(s)
const Service = require('@decisit/chirujs').Service;
class MyHelloService extends Service {
async prepare() {
this.subject = this.requireParam('subject');
}
async execute() {
return (`Hello ${this.subject}`);
}
}
class MySuffixedHelloService extends Service {
async prepare() {
this.suffix = this.requireParam('suffix');
this.subject = this.requireParam('subject');
}
async execute() {
const hello = await this.subserviceOutput(MyHelloService, 'hello', { subject: this.subject });
return (`${hello}${this.suffix}`);
}
}
const result = await new MySuffixedHelloService({ subject: 'World', suffix: '!' }).run();
console.log(result.output); // Hello World!
Rollback
const Service = require('@decisit/chirujs').Service;
class MyAwesomeService extends Service {
async prepare() {
this.model = this.requireParam('model');
}
async execute() {
this.model.set('someAttribute', 'newValue');
// ...
// ...
this.fail("Can't do this anymore!");
}
// rollback implementation should restore state of domain object(s)
async rollback() {
this.model.reset();
}
}
Rollback with subservice(s)
const Service = require('@decisit/chirujs').Service;
class UpdateProfileService extends Service {
async prepare() {
this.profile = this.requireParam('profile', { allowNull: false });
}
async execute() {
if (this.profile.get('login') == null || this.profile.get('login') == '') {
this.fail("Profile login can't be empty");
}
this.profile.save();
}
async rollback() {
// subservice is rollbacked, then service is
this.profile.reset();
}
}
class UpdateUserAndProfileService extends Service {
async prepare() {
this.user = this.requireParam('user', { allowNull: false });
this.profile = this.requireParam('profile', { allowNull: false });
}
async execute() {
// ...
await this.subserviceRun(UpdateProfileService, 'profile', { profile: this.profile });
// ...
}
// rollback implementation should restore state of domain object(s)
async rollback() {
// subservice is rollbacked, then service is
this.user.reset();
}
}
Contact us
Email: community@decisit.com
Discord: https://discord.gg/k8KPHeW
Licence
The MIT License
Copyright (c) 2018 DECISIT SAS https://decisit.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.