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#1: curl timeout vs socket timeout

Posted on 2008-01-28 22:56:35 by Ravi Menon

Hi,

We have two versions of client code, one using curl, and other one
using raw sockets via fsockopen(), and
we use the following code to set the i/o timeouts:

1) curl:

..
..
curl_setopt( $handle, CURLOPT_TIMEOUT, 1 );
..
..
$resp = curl_exec($handle)


2) sockets:

stream_set_timeout( $sock, 1);

Here we use frwrite() and fread() to send the request and read the
response respectively.


In (1), how is the timeout applied - is it:

a) timeout includes the entire curl_exec() call - the combined socket
write() ( to send the request ) and
the read() ( read the response ) calls.

or

b) timeout is independently applied to write() and read() end respectively.

Some of our tests seem to indicate it is (a).


In (2), I am assuming the stream timeout is applied at each i/o call
independently for fwrite() and fread() - I am pretty
much certain on this as this is how it would map to underlying C calls.....


It will be good to get a confirmation on our doubts.

Thanks,
Ravi

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#2: Re: curl timeout vs socket timeout

Posted on 2008-01-28 23:19:02 by List Manager

Ravi Menon wrote:
> Hi,
>
> We have two versions of client code, one using curl, and other one
> using raw sockets via fsockopen(), and
> we use the following code to set the i/o timeouts:
>
> 1) curl:
>
> .
> .
> curl_setopt( $handle, CURLOPT_TIMEOUT, 1 );

From the manual
CURLOPT_TIMEOUT
The maximum number of seconds to allow cURL functions to execute.

Notice: "functions", I would take this as the entire process.


> .
> .
> $resp = curl_exec($handle)
>
>
> 2) sockets:
>
> stream_set_timeout( $sock, 1);

From the manual

Set timeout period on a stream

This would tell me that it is on the entire process, not just one
function call like fwrite() or fread().

>
> Here we use frwrite() and fread() to send the request and read the
> response respectively.
>
>
> In (1), how is the timeout applied - is it:
>
> a) timeout includes the entire curl_exec() call - the combined socket
> write() ( to send the request ) and
> the read() ( read the response ) calls.
>
> or

True for both

>
> b) timeout is independently applied to write() and read() end respectively.

False for both

>
> Some of our tests seem to indicate it is (a).
>
>
> In (2), I am assuming the stream timeout is applied at each i/o call
> independently for fwrite() and fread() - I am pretty
> much certain on this as this is how it would map to underlying C calls.....
>
>
> It will be good to get a confirmation on our doubts.
>
> Thanks,
> Ravi
>

This is what I have experienced at least.

--
Jim Lucas

"Some men are born to greatness, some achieve greatness,
and some have greatness thrust upon them."

Twelfth Night, Act II, Scene V
by William Shakespeare

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#3: Re: curl timeout vs socket timeout

Posted on 2008-01-31 02:23:44 by Richard Lynch

On Mon, January 28, 2008 3:56 pm, Ravi Menon wrote:
> 1) curl:
>
> .
> .
> curl_setopt( $handle, CURLOPT_TIMEOUT, 1 );
> .
> .
> $resp = curl_exec($handle)
>
>
> 2) sockets:
>
> stream_set_timeout( $sock, 1);

This is only for AFTER you've already opened up the socket.

If you want a timeout on the opening, the setting is in php.ini, or
you can just use ini_set() right before the fsockopen.

> In (1), how is the timeout applied - is it:
>
> a) timeout includes the entire curl_exec() call - the combined socket
> write() ( to send the request ) and
> the read() ( read the response ) calls.
>
> or
>
> b) timeout is independently applied to write() and read() end
> respectively.
>
> Some of our tests seem to indicate it is (a).

You'd probably have to ask the cURL folks...

> In (2), I am assuming the stream timeout is applied at each i/o call
> independently for fwrite() and fread() - I am pretty
> much certain on this as this is how it would map to underlying C
> calls.....

Almost for sure, it applies to any given fwrite/fread.

Actually, probably at an even lower level, to any given packet
sent/received within an fwrite/fread

> It will be good to get a confirmation on our doubts.

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