mpyw / co
Asynchronous cURL executor simply based on resource and Generator
Installs: 16 141
Dependents: 5
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Stars: 135
Watchers: 14
Forks: 18
Open Issues: 0
Requires
- php: >=5.5.0
- ext-reflection: *
- lib-curl: >=7.20.0
- react/promise: ^2.4
Requires (Dev)
- php: >=7.0.0
- codeception/aspect-mock: ^2.0
- codeception/codeception: ^2.2
- codeception/specify: *
- mpyw/privator: ^2.0
- satooshi/php-coveralls: ^1.0
This package is auto-updated.
Last update: 2023-12-11 13:14:38 UTC
README
Asynchronous cURL executor simply based on resource and Generator
PHP | ❓ | Feature Restriction |
---|---|---|
7.0~ | 😄 | Full Support |
5.5~5.6 | 😧 | Generator is not so cool |
~5.4 | 💥 | Incompatible |
function curl_init_with(string $url, array $options = []) { $ch = curl_init(); $options = array_replace([ CURLOPT_URL => $url, CURLOPT_RETURNTRANSFER => true, ], $options); curl_setopt_array($ch, $options); return $ch; } function get_xpath_async(string $url) : \Generator { $dom = new \DOMDocument; @$dom->loadHTML(yield curl_init_with($url)); return new \DOMXPath($dom); } var_dump(Co::wait([ 'Delay 5 secs' => function () { echo "[Delay] I start to have a pseudo-sleep in this coroutine for about 5 secs\n"; for ($i = 0; $i < 5; ++$i) { yield Co::DELAY => 1; if ($i < 4) { printf("[Delay] %s\n", str_repeat('.', $i + 1)); } } echo "[Delay] Done!\n"; }, "google.com HTML" => curl_init_with("https://google.com"), "Content-Length of github.com" => function () { echo "[GitHub] I start to request for github.com to calculate Content-Length\n"; $content = yield curl_init_with("https://github.com"); echo "[GitHub] Done! Now I calculate length of contents\n"; return strlen($content); }, "Save mpyw's Gravatar Image URL to local" => function () { echo "[Gravatar] I start to request for github.com to get Gravatar URL\n"; $src = (yield get_xpath_async('https://github.com/mpyw')) ->evaluate('string(//img[contains(@class,"avatar")]/@src)'); echo "[Gravatar] Done! Now I download its data\n"; yield curl_init_with($src, [CURLOPT_FILE => fopen('/tmp/mpyw.png', 'wb')]); echo "[Gravatar] Done! Saved as /tmp/mpyw.png\n"; } ]));
The requests are executed as parallelly as possible 😄
Note that there is only 1 process and 1 thread.
[Delay] I start to have a pseudo-sleep in this coroutine for about 5 secs
[GitHub] I start to request for github.com to calculate Content-Length
[Gravatar] I start to request for github.com to get Gravatar URL
[Delay] .
[Delay] ..
[GitHub] Done! Now I calculate length of contents
[Gravatar] Done! Now I download its data
[Delay] ...
[Gravatar] Done! Saved as /tmp/mpyw.png
[Delay] ....
[Delay] Done!
array(4) {
["Delay 5 secs"]=>
NULL
["google.com HTML"]=>
string(262) "<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>
The document has moved
<A HREF="https://www.google.co.jp/?gfe_rd=cr&ei=XXXXXX">here</A>.
</BODY></HTML>
"
["Content-Length of github.com"]=>
int(25534)
["Save mpyw's Gravatar Image URL to local"]=>
NULL
}
Table of Contents
Installing
Install via Composer.
composer require mpyw/co:^1.5
And require Composer autoloader in your scripts.
require __DIR__ . '/vendor/autoload.php'; use mpyw\Co\Co; use mpyw\Co\CURLException;
API
Co::wait()
Wait for all the cURL requests to complete.
The options will override static defaults.
static Co::wait(mixed $value, array $options = []) : mixed
Arguments
(mixed)
$value
Any values to be parallelly resolved.(array<string, mixed>)
$options
Associative array of options.
Key | Default | Description |
---|---|---|
throw |
true |
Whether to throw or capture CURLException or RuntimeException on top-level. |
pipeline |
false |
Whether to use HTTP/1.1 pipelining. At most 5 requests for the same destination are bundled into single TCP connection. |
multiplex |
true |
Whether to use HTTP/2 multiplexing. All requests for the same destination are bundled into single TCP connection. |
autoschedule |
false |
Whether to use automatic scheduling by CURLMOPT_MAX_TOTAL_CONNECTIONS . |
interval |
0.002 |
curl_multi_select() timeout seconds. 0 means real-time observation. |
concurrency |
6 |
Limit of concurrent TCP connections. 0 means unlimited.The value should be within 10 at most. |
Throwable
which are not extended fromRuntimeException
, such asError
Exception
LogicException
are not captured. If you need to capture them, you have to write your own try-catch blocks in your functions.- HTTP/1.1 pipelining can be used only if the TCP connection is already established and verified that uses keep-alive session. It means that the first bundle of HTTP/1.1 requests CANNOT be pipelined. You can use it from second
yield
inCo::wait()
call. - To use HTTP/2 multiplexing, you have to build PHP with libcurl 7.43.0+ and
--with-nghttp2
. - To use
autoschedule
, PHP 7.0.7 or later is required.
When autoschedule
Disabled:
curl_multi_add_handle()
call can be delayed.concurrency
controlling withpipeline
/multiplex
CANNOT be correctly driven. You should set higherconcurrency
in those cases.
When autoschedule
Enabled:
curl_multi_add_handle()
is always immediately called.CURLINFO_TOTAL_TIME
CANNOT be correctly calculated. "Total Time" includes the time waiting for other requests are finished.
The details of CURLIFNO_*_TIME
timing charts are described at the bottom of this page.
Return Value
(mixed)
Resolved values; in exception-safe context, it may contain...
CURLException
which has been raised internally.RuntimeException
which has been raised by user.
Exception
- Throws
CURLException
orRuntimeException
in exception-unsafe context.
Co::async()
Execute cURL requests along with Co::wait()
call, without waiting resolved values.
The options are inherited from Co::wait()
.
This method is mainly expected to be used ...
- When you are not interested in responses.
- In
CURLOPT_WRITEFUNCTION
orCURLOPT_HEADERFUNCTION
callbacks.
static Co::async(mixed $value, mixed $throw = null) : null
Arguments
(mixed)
$value
Any values to be parallelly resolved.(mixed)
$throw
Overridesthrow
inCo::wait()
options when you passedtrue
orfalse
.
Return Value
(null)
Exception
CURLException
orRuntimeException
can be thrown in exception-unsafe context.
Note that you CANNOT capture top-level exceptions unless you catch outside ofCo::wait()
call.
Co::isRunning()
Return if Co::wait()
is running().
With this check, you can safely call Co::wait()
or Co::async()
.
static Co::isRunning() : bool
Co::any()
Co::race()
Co::all()
Return a Generator that resolves with specific value.
static Co::any(array $value) : \Generator<mixed> static Co::race(array $value) : \Generator<mixed> static Co::all(array $value) : \Generator<mixed>
Family | Return Value | Exception |
---|---|---|
Co::any() |
First Success | AllFailedException |
Co::race() |
First Success | First Failure |
- Jobs CANNOT be canceled.
Incomplete jobs remain even ifCo::any()
orCo::race()
is resolved. Co::all(...)
is just a wrapper of(function () { return yield ...; })()
.
It should be only used withCo::race()
orCo::any()
.
Co::wait(function () { $group1 = Co::all([$ch1, $ch2, $ch3]); $group2 = Co::all([$ch4, $ch5, $ch6]); $group1or2 = Co::any([$group1, $group2]); var_dump(yield $group1or2); });
Co::setDefaultOptions()
Co::getDefaultOptions()
Overrides/gets static default settings.
static Co::setDefaultOptions(array $options) : null static Co::getDefaultOptions() : array
Rules
Conversion on Resolving
The all yielded/returned values are resolved by the following rules.
Yielded values are also resent to the Generator.
The rules will be applied recursively.
Before | After |
---|---|
cURL resource | curl_multi_getconent() result or CURLException |
Array | Array (with resolved children) or RuntimeException |
Generator Closure Generator |
Return value (after all yields done) or RuntimeException |
"Generator Closure" means Closure that contains yield
keywords.
Exception-safe or Exception-unsafe Priority
Context in Generator
Exception-unsafe context by default.
The following yield
statement specifies exception-safe context.
$results = yield Co::SAFE => [$ch1, $ch2];
This is equivalent to:
$results = yield [ function () use ($ch1) { try { return yield $ch1; } catch (\RuntimeException $e) { return $e; } }, function () use ($ch2) { try { return yield $ch2; } catch (\RuntimeException $e) { return $e; } }, ];
Context on Co::wait()
Exception-unsafe context by default.
The following setting specifies exception-safe context.
$result = Co::wait([$ch1, $ch2], ['throw' => false]);
This is equivalent to:
$results = Co::wait([ function () use ($ch1) { try { return yield $ch1; } catch (\RuntimeException $e) { return $e; } }, function () use ($ch2) { try { return yield $ch2; } catch (\RuntimeException $e) { return $e; } }, ]);
Context on Co::async()
Contexts are inherited from Co::wait()
.
The following setting overrides parent context as exception-safe.
Co::async($value, false);
The following setting overrides parent context as exception-unsafe.
Co::async($value, true);
Pseudo-sleep for Each Coroutine
The following yield
statements delay the coroutine processing:
yield Co::DELAY => $seconds yield Co::SLEEP => $seconds # Alias
Comparison with Generators of PHP7.0+ or PHP5.5~5.6
return
Statements
PHP 7.0+:
yield $foo; yield $bar; return $baz;
PHP 5.5~5.6:
yield $foo; yield $bar; yield Co::RETURN_WITH => $baz;
Although experimental aliases Co::RETURN_
Co::RET
Co::RTN
are provided,
Co::RETURN_WITH
is recommended in terms of readability.
yield
Statements with Assignment
PHP 7.0+:
$a = yield $foo; echo yield $bar;
PHP 5.5~5.6:
$a = (yield $foo); echo (yield $bar);
finally
Statements
Be careful that return
triggers finally
while yield Co::RETURN_WITH =>
does not.
try { return '...'; } finally { // Reachable }
try { yield Co::RETURN_WITH => '...'; } finally { // Unreachable }
Appendix
Timing Charts
Note that S is equal to Q when autoschedule
is disabled.
Basic
ID | When |
---|---|
Q | curl_multi_exec() immediately after curl_multi_add_handle() called |
S | Processing started actually |
DNS | DNS resolution completed |
TCP | TCP connection established |
TLS | TLS/SSL session established |
HS | All HTTP request headers sent |
BS | Whole HTTP request body sent |
HR | All HTTP response headers received |
BR | Whole HTTP response body received |
Constant | Time |
---|---|
CURLINFO_NAMELOOKUP_TIME | DNS - S |
CURLINFO_CONNECT_TIME | TCP - S |
CURLINFO_APPCONNECT_TIME | TLS - S |
CURLINFO_PRETRANSFER_TIME | HS - S |
CURLINFO_STARTTRANSFER_TIME | HR - S |
CURLINFO_TOTAL_TIME | BR - Q |
With Redirections by CURLOPT_FOLLOWLOCATION
ID | When |
---|---|
Q | curl_multi_exec() immediately after curl_multi_add_handle() called |
S | Processing started actually |
DNS(1) | DNS resolution completed |
TCP(1) | TCP connection established |
TLS(1) | TLS/SSL session established |
HS(1) | All HTTP request headers sent |
BS(1) | Whole HTTP request body sent |
HR(1) | All HTTP response headers received |
DNS(2) | DNS resolution completed |
TCP(2) | TCP connection established |
TLS(2) | TLS/SSL session established |
HS(2) | All HTTP request headers sent |
BS(2) | Whole HTTP request body sent |
HR(2) | All HTTP response headers received |
BR(2) | Whole HTTP response body received |
Constant | Time |
---|---|
CURLINFO_REDIRECT_TIME | HR(1) - Q |
CURLINFO_NAMELOOKUP_TIME | DNS(2) - HR(1) |
CURLINFO_CONNECT_TIME | TCP(2) - HR(1) |
CURLINFO_APPCONNECT_TIME | TLS(2) - HR(1) |
CURLINFO_PRETRANSFER_TIME | HS(2) - HR(1) |
CURLINFO_STARTTRANSFER_TIME | HR(2) - HR(1) |
CURLINFO_TOTAL_TIME | BR(2) - Q |