Rubuta irin wannan hadadden labarin game da mai sarrafa Express async a cikin wannan tsari na iya buƙatar dogon bayani. Dangane da buƙatarku, zan yi ƙoƙarin matse shi don dacewa da wannan dandali.
Mai sarrafa async Express shine matsakaicin kayan aiki don sarrafa kurakurai da keɓantacce don hanyoyin Express a cikin Node.js. Yana sauƙaƙa lambar ku kuma yana taimakawa wajen guje wa sakewa da yawa. A al'adance, muna amfani da gwada-kame a kowace hanya don magance kurakurai amma wannan hanya na iya sa lambar ta zama mai maimaituwa. Mai sarrafa async Express yana ba da madadin mafi tsafta.
const express = require('express');
const AsyncHandler = require('express-async-handler');
const router = express.Router();
router.get('/', AsyncHandler(async (req, res) => {
const data = await someAsyncFunction();
res.json(data);
}));
module.exports = router;
Wannan ita ce madaidaiciyar lambar JavaScript wacce ke shigo da fakitin bayyananne da fakitin-async-handler. Yana saita hanya ta amfani da aikin express.Router(). Sannan ya bayyana buƙatar GET akan hanya, wanda aikin AsyncHandler ke sarrafa shi.
A cikin snippet code, kuna iya mamakin menene aikin AsyncHandler yake. Da kyau, AsyncHandler shine maɓalli mai mahimmanci daga fakitin 'express-async-handler'. Wannan aikin yana kunshe da hanyar ku kuma yana kama duk wani kurakurai da ya faru, yana wuce su zuwa ga kuskuren Express ɗin ku na sarrafa middleware.
Yanzu bari mu karya wannan mataki-mataki:
1. Muna kiran aikin AsyncHandler tare da mai sarrafa hanyar mu a matsayin hujja.
2. A cikin mai sarrafa hanya, mun sanya alamar aikin a matsayin async.
3. Muna amfani da kalmar jira don kiran wasuAsyncFunction wanda ya dawo da alkawari.
4. Idan alkawarin ya warware, muna adana sakamakon a cikin ma'aunin bayanai sannan mu mayar da shi cikin martani kamar json.
5. Idan alƙawarin ya ƙi ko wasu kurakurai sun faru yayin wannan aikin AsyncHandler ya kama su kuma sun wuce sarkar tsakiya.
Muhimmancin async/jira a JavaScript
Async/ jira hanya ce ta zamani ta gudanar da ayyukan asynchronous a cikin JavaScript. Yana sa lambar ku asynchronous tayi kama da lambar aiki tare, wanda ya fi sauƙin fahimta da kiyayewa. Don fahimtar yadda yake aiki a cikin ɗakin karatu na express-async-handler, kuna buƙatar samun kyakkyawar fahimtar shirye-shiryen asynchronous a JavaScript.
Async / jira yana ba ku damar yin aiki tare da Alkawari cikin yanayi mai daɗi. Yin amfani da gwadawa / kama za ku iya sarrafa kurakurai kamar yadda kuke sarrafa su a lambar aiki tare.
Express da Middleware
Express shine tsarin sabar gidan yanar gizo don Node.js - yana sauƙaƙa abubuwa da yawa kamar sarrafa buƙatun HTTP kuma yana ba da adadi mai yawa na sassauci tare da gine-gine na tsakiya.
Middleware ayyuka ne waɗanda ke da damar yin amfani da buƙatun, amsawa, da aikin tsakiya na gaba a cikin zagayowar amsa buƙatar aikace-aikacen. Za su iya aiwatar da kowace lamba, gyara buƙatun da abubuwan amsawa kuma su ƙare zagayowar amsa buƙatun. Express-async-handler babban kayan aiki ne na tsakiya wanda ke taimakawa keɓance keɓancewa a cikin hanyoyin bayyana asynchronous.
[b] Tuna[/b], idan kuna ma'amala da ayyukan async a cikin hanyoyin Express ɗinku, kuna iya amfani da express-async-handler ko makamancin haka don kiyaye lambar ku da sauƙin sarrafawa. Idan ba ku kula da waɗannan shari'o'in ba, zai iya haifar da kin amincewar Alƙawari wanda zai iya haifar da tsarin Node.js ɗin ku.
Na mayar da hankali kan fakitin express-async-handler a cikin wannan labarin, amma ka'idodin sun shafi sauran Node.js middleware kuma. Fahimtar yadda ake sarrafa ma'anar asynchronous a tsafta shine babban yanki na ci gaban JavaScript na zamani.
