Phaiax

How does async work in `async-std`?

(Phaiax - 2019/12/1 - CC_BY_SA 4.0)

Lately I was porting a software from tokio/futures-1.0 to async-await. I somehow thought async-std was the successor of tokio and ported everything to async-std. 80% in, I noticed that my hyper dependency requires tokio and that it's not possible to replace tokio with async-std without also replacing hyper. Also, tokio and async-std try to solve the same problem. So I started a journey into the inners of the rust async story to find out if it is possible to use both tokio and async-std at the same time. (tl;dr: it is). I had heard of reactors and executors before, but there was much new stuff to discover.

	"""
	LICENSE: MIT

	Example of using unix socket in SOCK_DGRAM mode.

	"""

	import socket
	import socketserver
	import time

	GISCAN HarfBuzz-0.0.gir
	/home/jhbuild/jhbuild/checkout/harfbuzz/src/hb-aat-layout.h:36: syntax error, unexpected identifier in 'HB_BEGIN_DECLS' at 'HB_BEGIN_DECLS'
	/home/jhbuild/jhbuild/checkout/harfbuzz/src/hb-aat-layout.h:431: syntax error, unexpected '', expecting ')' or ',' in 'hb_aat_layout_get_feature_types (hb_face_t face,' at '*'
	/home/jhbuild/jhbuild/checkout/harfbuzz/src/hb-aat-layout.h:433: syntax error, unexpected UNSIGNED, expecting identifier or '(' or '' in ' unsigned int feature_count, /* IN/OUT. May be NULL. */' at 'unsigned'
	/home/jhbuild/jhbuild/checkout/harfbuzz/src/hb-aat-layout.h:434: syntax error, unexpected typedef-name, expecting identifier or '(' or '' in ' hb_aat_layout_feature_type_t features /* OUT. May be NULL. */);' at 'hb_aat_layout_feature_type_t'
	/home/jhbuild/jhbuild/checkout/harfbuzz/src/hb-aat-layout.h:434: syntax error, unexpected ')', expecting ',' or ';' in ' hb_aat_layout_feature_type_t features / OUT. May be NULL. */);' at ')'
	/home/jh

	curl -X HEAD -v --user 'myuser:mypw' 'http://192.168.0.12:5005/ExistingFolder/' --basic
	Warning: Setting custom HTTP method to HEAD with -X/--request may not work the
	Warning: way you want. Consider using -I/--head instead.
	* Trying 192.168.0.12...
	* TCP_NODELAY set
	% Total % Received % Xferd Average Speed Time Time Time Current
	Dload Upload Total Spent Left Speed
	0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Connected to 192.168.0.12 (192.168.0.12) port 5005 (#0)
	* Server auth using Basic with user 'myuser'
	> HEAD /ExistingFolder/ HTTP/1.1

	<html>
	<head>
	<style>
	canvas {
	margin: 10 auto;
	border: 1px solid gray;
	display:block;
	}
	div#info {
	position: absolute;

	from sqlalchemy.orm import sessionmaker, relationship

	class User(Base, HtmlEditable):
	__tablename__ = 'user'
	id = MyColumn(Integer, primary_key=True)
	name = MyColumn(String, inputtype="text")
	fullname = MyColumn(String, inputtype="text")
	nickname = MyColumn(String)
	large_enough = MyColumn(Boolean, inputtype="checkbox")
	address_id = MyColumn(Integer, ForeignKey("address.id"))

	M104 S0 ; Set hotend temperature to 0
	M140 S0 ; Set bed temperature to 0
	G92 E0 ; Reset absolute Extruder position
	G1 E-2 F300 ;Retract the filament
	G28 R X Y ; Raise Z then home X,Y
	M18 X Y Z E ; Disable all motors
	M82 ;absolute extrusion mode (needed?)
	M107 ; Print fan off
	M81 ; ATX off

	#[macro_use] extern crate error_chain;


	// All errors that can occour everywhere in the crate
	pub mod errors {
	error_chain!{
	errors {
	Pig { description("Pig-Descr") display("Pig-Display")}
	Bat {}
	Uhu {}

	_XGetRequest API was backported to libx11-1.4.4 in:
	http://git.openembedded.org/openembedded-core/commit/?id=e08604800fe1cb8f240f53c147ceb4ee08a29b91

	This breaks e.g. libsdl-image build with:
	\| /OE/shr-core/tmp-eglibc/sysroots/qemux86-64/usr/lib/libSDL.so: undefined reference to `_XGetRequest'

	For details see: https://bugzilla.redhat.com/show_bug.cgi?id=782251

	Upstrea-Status: Accepted

Phaiax

How does async work in async-std?

How does async work in `async-std`?