异步和同步http请求超时机制

异步超时设置:

例子:
Example: do a simple HTTP GET request for http://www.nethype.de/ and print the response body.

   http_request GET => "http://www.nethype.de/", sub {
      my ($body, $hdr) = @_;
      print "$body\n";
   };
   
 The callback will be called with the response body data as first argument (or undef if an error occurred)

回调会被调用第一个参数是响应的内容,如果错误发生就是undef
 
jrhmpt01:/root/async# cat a6.pl 
use AnyEvent::HTTP;
use HTTP::Date qw(time2iso str2time time2iso time2isoz);
my $cv = AnyEvent->condvar;
   http_request GET => 'http://120.55.118.6:3000/api/env?ip=192.168.32.101', sub {
      my ($body, $hdr) = @_;
      $time2=time2iso(time());
print "\$time2 is $time2\n";
      print "$body\n";
   };
$time1=time2iso(time());
print "\$time1 is $time1\n";
      print "11111111111111111111\n";
$cv->recv();
jrhmpt01:/root/async# 

jrhmpt01:/root/async# perl a6.pl 
$time1 is 2016-04-22 09:34:49
11111111111111111111
$time2 is 2016-04-22 09:35:19
["","192.168.32.101  dr-mysql  env-backup"]



timeout => $seconds
The time-out to use for various stages - each connect attempt will reset the timeout, as will read or write activity, i.e. this is not an overall timeout.

Default timeout is 5 minutes.


time-out 使用于各个阶段,每个连接尝试重置timeout,会读或者写,即这不是整体的超时时间

默认是5分钟

//异步超时例子:
jrhmpt01:/root/async# cat a6.pl 
use AnyEvent::HTTP;
use HTTP::Date qw(time2iso str2time time2iso time2isoz);
my $cv = AnyEvent->condvar;
   http_request GET => 'http://120.55.118.6:3000/api/env?ip=192.168.32.101',timeout => 20, sub {
      my ($body, $hdr) = @_;
      $time2=time2iso(time());
print "\$time2 is $time2\n";
      print "$body\n";
   };
$time1=time2iso(time());
print "\$time1 is $time1\n";
      print "11111111111111111111\n";
$cv->recv();


返回；
jrhmpt01:/root/async# perl a6.pl 
$time1 is 2016-04-22 09:41:48
11111111111111111111
$time2 is 2016-04-22 09:42:08


//同步超时例子:

jrhmpt01:/root/async# cat a1.pl 
use  LWP::UserAgent;
use utf8;
use DBI;
use POSIX;
use HTTP::Date qw(time2iso str2time time2iso time2isoz);
use Data::Dumper;
use HTML::TreeBuilder;
  use HTML::TreeBuilder::XPath;
my $ua = LWP::UserAgent->new;
$ua->timeout(10);
$ua->env_proxy;
$ua->agent("Mozilla/8.0");
#my $response = $ua->get('http://data.10jqka.com.cn/financial/yjyg/date/2016-03-31/board/ALL/field/enddate/order/desc/page/1/ajax/1/');
#my $response = $ua->get('http://data.10jqka.com.cn/financial/yjyg/');

$time1=time2iso(time());
print "\$time1 is $time1\n";
my $response = $ua->get('http://120.55.118.6:3000/api/env?ip=192.168.32.101');
if ($response->is_success) {
print   $response->decoded_content;  # or whatever
}else{print   $response->decoded_content; };
$time2=time2iso(time());
print "\$time2 is $time2\n";
print "111111111111111111111111111111111111\n";
jrhmpt01:/root/async# perl a1.pl 
$time1 is 2016-04-22 09:51:56
500 read timeout
$time2 is 2016-04-22 09:52:06
111111111111111111111111111111111111

$ua->timeout( $secs )
Get/set the timeout value in seconds. The default timeout() value is 180 seconds, i.e. 3 minutes.

The requests is aborted if no activity on the connection to the server is observed for timeout seconds. This means that the time it takes for the complete transaction and the request() method to actually return might be longer.

同步情况下,  设置timeout 值为秒, 默认超时时间是180秒 3分钟