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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; }

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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.

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