Plack::Middleware::QueryCounter::DBI - DBI query counter per request middleware
Enable this middleware using Plack::Builder.
use MyApp;
use Plack::Builder;
my $app = MyApp->psgi_app;
builder {
enable 'QueryCounter::DBI';
$app;
};
You can specify HTTP header using prefix option.
builder {
enable 'QueryCounter::DBI', prefix => 'X-MyQueryCounter';
$app;
};
Plack::Middleware::QueryCounter::DBI is a middleware to count SQL query per each HTTP request. Count result outputs on HTTP header.
The counted quieries classify read, write or other query.
You'll get following HTTP headers.
X-QueryCounter-DBI-Total: 20
X-QueryCounter-DBI-Read: 16
X-QueryCounter-DBI-Write: 4
X-QueryCounter-DBI-Other: 0
Then, you can write to access log using nginx.
log_format ltsv 'host:$remote_addr\t'
'user:$remote_user\t'
(snip)
'user_agent:$http_user_agent\t'
'query_total:$sent_http_x_querycounter_dbi_total\t'
'query_read:$sent_http_x_querycounter_dbi_read\t'
'query_write:$sent_http_x_querycounter_dbi_write\t'
'query_other:$sent_http_x_querycounter_dbi_other\t';
LTSV is Labeled Tab-separated Values, see http://ltsv.org/
Additionally, I recommend to remove these header for end-user response.
location / {
proxy_hide_header 'X-QueryCounter-DBI-Total';
proxy_hide_header 'X-QueryCounter-DBI-Read';
proxy_hide_header 'X-QueryCounter-DBI-Write';
proxy_hide_header 'X-QueryCounter-DBI-Other';
proxy_pass http://backend;
}
Copyright (C) Masatoshi Kawazoe (acidlemon).
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Masatoshi Kawazoe (acidlemon) [email protected]
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