Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Re: Simultaneously reading from a file and serving data

by BrowserUk (Pope)
on Feb 27, 2014 at 21:41 UTC ( #1076446=note: print w/replies, xml ) Need Help??

in reply to Simultaneously reading from a file and serving data

Completely untested, this should be close:

#!/usr/bin/perl use strict; use warnings; use threads: + ## Added use threads::shared; + ## Added use Data::Dumper; use Net::WebSocket::Server; use JSON; my %data; my $json :shared; + ## Modded async { + ## Added Net::WebSocket::Server->new( listen => 8080, on_connect => sub { my ($serv, $conn) = @_; $conn->on( handshake => sub { my ($conn, $handshake) = @_; }, utf8 => sub { my ($conn) = @_; lock $json; + ## Added $_->send_utf8($json) for $conn->server->connection +s; }, ); }, )->start; }->detach; + ## Added open my $fh, '<', 'toto1' or die "can't open fifo toto1: $?"; while ( my $line = <$fh> ) { my @list = ( split /\s+/, $line ); # skip empty lines next if $#list <= 1; shift @list if $list[0] eq ''; # test for iostat header next if $list[0] eq 'avg-cpu:'; next if $list[0] eq 'Device:'; # test for vmstat header next if $list[0] eq 'procs'; if ( $#list == 11 ) { ( undef, $data{io}{ $list[0] }{rrqms}, $data{io}{ $list[0] }{wrqms}, $data{io}{ $list[0] }{reads}, $data{io}{ $list[0] }{writes}, $data{io}{ $list[0] }{rsecs}, $data{io}{ $list[0] }{wsecs}, $data{io}{ $list[0] }{avgrqsz}, $data{io}{ $list[0] }{avgqusz}, $data{io}{ $list[0] }{await}, $data{io}{ $list[0] }{svctm}, $data{io}{ $list[0] }{util} ) = @list; } elsif ( $#list == 15 ) { ( $data{vm}{r}, $data{vm}{b}, $data{vm}{swpd}, $data{vm}{free}, $data{vm}{buff}, $data{vm}{cache}, $data{vm}{swapin}, $data{vm}{swapout}, $data{vm}{ioin}, $data{vm}{ioout}, $data{vm}{sysin}, $data{vm}{syscs}, $data{vm}{user}, $data{vm}{sys}, $data{vm}{idle}, $data{vm}{wait} ) = @list; } elsif ( $#list == 5 ) { $data{vm}{nice} = $list[1]; } { ## + Added lock $json; ## + Added $json = encode_json( \%data); } ## + Added sleep 1; }

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

Replies are listed 'Best First'.
Re^2: Simultaneously reading from a file and serving data
by wazoox (Prior) on Mar 04, 2014 at 14:27 UTC
    That mostly works :) I'm trying to get the client part working, and I'll share the lot, because a web-based system real-time system monitor may probably be of some use to others.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1076446]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (14)
As of 2016-10-26 13:00 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (340 votes). Check out past polls.