javascript - Writing promise based HTTP request using Async/Await -


is possible rewrite following http request example node manual use async/await rather promises? familiar return new promise method resolve/reject rather use async/await.

    const postdata = querystring.stringify({       'msg': 'hello world!'     });      const options = {       hostname: 'www.google.com',       port: 80,       path: '/upload',       method: 'post',       headers: {         'content-type': 'application/x-www-form-urlencoded',         'content-length': buffer.bytelength(postdata)       }     };      const req = http.request(options, (res) => {       console.log(`status: ${res.statuscode}`);       console.log(`headers: ${json.stringify(res.headers)}`);       res.setencoding('utf8');       res.on('data', (chunk) => {         console.log(`body: ${chunk}`);       });       res.on('end', () => {         console.log('no more data in response.');       });     });      req.on('error', (e) => {       console.error(`problem request: ${e.message}`);     });      // write data request body     req.write(postdata);     req.end();

the code posted doesn't use promises (req event emitter, more clientrequest instance), no cannot use async/await syntax here.

i familiar return new promise method resolve/reject rather use async/await

no, cannot use async/await instead of promise constructor anyway. can use syntactic sugar then calls only.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more