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* The [jsonq] tag generates a record in a table (by default C<qc>)
that allows users to access JSON records created by a query. The query associated with the record will be run with any parameters that are specified being taken either from 1) CGI variables or 2) the path info. * Adds QueryCache directive that speficies the "introducer", the URL fragment which calls the query cache short circuit, the table to be used, the content-type, * Adds hook early in the cycle to vet queries based on Session ID cookie and IP address, allowing the query to happen before sessions are attached or deep page initialization completes. This improves performance dramatically. * Adds access routine in Vend::Data to actually process the query and access the tables in question. * Hooks to allow an external program (eg will be added soon) to totally bypass IC for even lower overhead for queries.
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UserTag jsonq Order params public query | ||
UserTag jsonq addAttr | ||
UserTag jsonq Routine <<EOR | ||
sub { | ||
my ($params, $public, $query, $opt) = @_; | ||
my $qc = $Vend::Cfg->{QueryCache} or return undef; | ||
my $tab = $qc->{table}; | ||
my $db = dbref($tab) | ||
or do { | ||
::logError("%s: missing table %s", 'query-cache', $tab); | ||
return; | ||
}; | ||
my $intro = $qc->{intro}; | ||
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## Need to undef it if wrong because of vendURL | ||
my $external = $qc->{external_program} || $opt->{external_program}; | ||
undef $external unless $external =~ m{^\w+:}; | ||
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#::logDebug("External=$external"); | ||
# QC Table fields | ||
# code qid session qtext meta params public secure update_date expire_date results | ||
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my $exp_sess = '0'; | ||
my $exp_addr = '0'; | ||
my $exp_secure = '0'; | ||
my $exp_hash = '0'; | ||
my $exp_meta = '0'; | ||
my $exp_view = '0'; | ||
my $exp_term = '0'; | ||
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$opt->{expire} ||= $public ? $qc->{default_public_expire} : $qc->{default_expire}; | ||
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$public or $exp_sess = $Vend::SessionID; | ||
$opt->{ip} and $exp_addr = $CGI::remote_addr; | ||
$opt->{secure} and $exp_secure = 1; | ||
$opt->{params} and $exp_term = $opt->{params}; | ||
$opt->{hash} and $exp_hash = $opt->{hash}; | ||
$opt->{meta} and $exp_meta = $opt->{meta}; | ||
$opt->{meta_view} and $exp_view = $opt->{meta_view}; | ||
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#::logDebug("hash=$opt->{hash}"); | ||
my $qid = Vend::Util::generate_key(join '|', $query, $exp_sess, $exp_addr, $exp_term, $exp_secure, $exp_hash,$exp_meta,$exp_view); | ||
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CHECKEXIST: { | ||
if(my $exist = $db->row_hash('qid',$qid) ) { | ||
if(my $ed = $exist->{expire_date}) { | ||
$ed =~ s/\D+//g; | ||
last CHECKEXIST if $ed lt POSIX::strftime('%Y%m%d%H%M%S', localtime()); | ||
} | ||
return Vend::Util::vendUrl("$intro/$qid", undef, $external, { secure => $exist->{secure}, add_dot_html => 0 }); | ||
} | ||
} | ||
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my $rec = { | ||
qtext => $query, | ||
qid => $qid, | ||
public => $public, | ||
secure => $opt->{secure}, | ||
hash => $opt->{hash}, | ||
params => $params, | ||
meta_view => $opt->{meta_view}, | ||
meta => $opt->{meta}, | ||
content_type => $opt->{content_type}, | ||
template => $opt->{template}, | ||
}; | ||
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if($opt->{expire} =~ /\D/ or length($opt->{expire}) < 7) { | ||
my $add = $opt->{expire} =~ /[a-z]/ ? Vend::Config::time_to_seconds($opt->{expire}) : $opt->{expire} ; | ||
$rec->{expire_date} = POSIX::strftime('%Y%m%d%H%M%S', localtime( time() + $add )); | ||
} | ||
else { | ||
$rec->{expire_date} = $opt->{expire}; | ||
} | ||
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$rec->{session} = $Vend::SessionID unless $public; | ||
$rec->{ipaddr} = $CGI::remote_addr if $opt->{ip}; | ||
$db->set_slice($qid, $rec); | ||
return Vend::Util::vendUrl("$intro/$qid", undef, $external, { secure => $rec->{secure}, no_session => 1, add_dot_html => 0 }); | ||
} | ||
EOR | ||
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UserTag jsonq Documentation <<EOD | ||
=head2 NAME | ||
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[jsonq] - Ajax query generation with security | ||
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=head2 SYNOPSIS | ||
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[jsonq | ||
query="select field1,field2,field3 ..." | ||
expire="30min|3 days|86400|20170511" | ||
public="0|1" | ||
hash="0|1|field" | ||
meta="option=value" | ||
meta-view="metaview" | ||
ip="0|1" | ||
] | ||
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NOTE: only the query is required | ||
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=head2 CONFIGURATION | ||
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QueryCache enabled 1 | ||
QueryCache table qc | ||
QueryCache intro qc | ||
QueryCache default_expire 30min | ||
QueryCache default_public_expire 48hours | ||
QueryCache default_return {} | ||
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=head2 PREREQUISITES | ||
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Module JSON | ||
Module Digest::MD5 | ||
Module SQL::Statement | ||
Module SQL::Parser | ||
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=head2 DESCRIPTION | ||
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The [jsonq] tag generates a record in a table (by default C<qc>) that allows users to access JSON records | ||
created by a query. The query associated with the record will be run with any parameters that are specified | ||
being taken either from 1) CGI variables or 2) the path info. | ||
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The return value of [jsonq] is a URL to access the query. | ||
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The URL used short circuits the usual Interchange session and catalog configuration mechanisms in Dispatch.pm, | ||
allowing fast (up to 3 times faster) access to JSON records. Alternatively, there can be an external handler | ||
for requests that could increase speed dramatically. | ||
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The tag is standard, and is in the UserTag code area. It is enabled by specifying any setting for the | ||
QueryCache directive, by default "enabled 1". | ||
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=head2 The table | ||
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The C<qc> table has the following structure (in MySQL, other databases could be used): | ||
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+--------------+--------------+------+-----+-------------------+ | ||
| Field | Type | Null | Key | Default | | ||
+--------------+--------------+------+-----+-------------------+ | ||
| qid | varchar(32) | NO | PRI | NULL | | ||
| session | varchar(64) | YES | | NULL | | ||
| ipaddr | varchar(16) | YES | | NULL | | ||
| qtext | text | NO | | | | ||
| verbatim | tinyint(1) | YES | | | | ||
| meta_view | varchar(255) | YES | | NULL | | ||
| meta | text | YES | | NULL | | ||
| cols | varchar(255) | YES | | NULL | | ||
| content_type | varchar(128) | YES | | NULL | | ||
| params | text | YES | | NULL | | ||
| template | text | YES | | NULL | | ||
| public | char(1) | YES | | | | ||
| secure | char(1) | YES | | | | ||
| hash | varchar(32) | YES | | | | ||
| update_date | timestamp | NO | | CURRENT_TIMESTAMP | | ||
| expire_date | datetime | YES | | NULL | | ||
| results | text | YES | | NULL | | ||
+--------------+--------------+------+-----+-------------------+ | ||
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When the [jsonq] tag is run, the parameters act on the table in this way: | ||
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=over 4 | ||
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=item query | ||
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Enters the table as C<qtext>. This is the actual query that will run, and | ||
is possibly affected by CGI paramers C<mv_matchlimit> and C<mv_first_match>. | ||
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=item public | ||
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Enters table as C<public> field. If this is set, query is accessible to anyone. | ||
Do not use on private data sets. | ||
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=item params | ||
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The name of the CGI variables that will be inserted in place of any placeholders | ||
in the query. This uses DBI methodology, so it is secure and will not allow | ||
SQL injection. If you wish to use the parameter in a C<LIKE> query, then append | ||
a C<%> character to the parameter, i.e. | ||
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[jsonq params="q%" query="select * from products where description like ?"] | ||
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This causes the value of C<$CGI->{q} / [cgi q]> to be inserted surrounded by | ||
the percent signs, causing LIKE to work with partial strings. | ||
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If you wish to use the parameter in a C<LIKE> query but only match the beginning | ||
of the string, then I<prepend> a C<^> character to the parameter, i.e. | ||
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[jsonq params="^q" query="select * from products where description like ?"] | ||
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This causes the value of C<$CGI->{q} / [cgi q]> to be inserted followed by | ||
the percent signs, causing LIKE to work with the first part of the string | ||
anchored. | ||
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By default, searches are rejected (returning C<default_return>) until the | ||
search parameter is 3 characters long. This prevents large query returns | ||
early in parameter typing, possibly overloading the database server. | ||
If you wish to start searching at a lower threshold (or a higher one) | ||
then append a colon followed by a digit: | ||
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[jsonq params="^q:1" query="select * from products where description like ?"] | ||
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This causes the query to be done the moment the C<q> parameter has a single | ||
character. A C<4> would delay return until four characters are reached, | ||
etc. | ||
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=item hash | ||
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Enters table as C<hash> field. If this is blank, the query when run returns an "array of | ||
arrays" in JSON. If it is set to digits only, normally 1, then the query will return | ||
an array of hashes. If it is set to a field name, this is the field that will be used | ||
to create a hash of hashes. Normally you would only use a unique key for that. | ||
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=item meta_view | ||
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Selects the I<meta view> which will operate on the JSON query output. This allows | ||
you, typically, to run Interchange filters on the output which will transform the | ||
output data from the query. | ||
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NOTE: If you are using the external CGI delivery mechanism, this will be ignored. | ||
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=item meta | ||
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Metadata options which will operate on the JSON query output. This allows | ||
setting other values (such as jui_datagrid to sculpt response). | ||
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NOTE: If you are using the external CGI delivery mechanism, this will be ignored. | ||
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=item template | ||
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If you don't want JSON out, you can iterate over any array that you produce | ||
and output text or HTML based on the Interchange I<attr_list> format. The | ||
special areas | ||
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{PRE_TEMPLATE} Pre text {/PRE_TEMPLATE} | ||
{POST_TEMPLATE} Post text {/POST_TEMPLATE} | ||
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allow you to add text to the template that will not be iterted over. | ||
This invocation: | ||
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[tmpn tpl] | ||
{PRE_TEMPLATE}<ul>{/PRE_TEMPLATE} | ||
<li>{SKU} - {DESCRIPTION}</li> | ||
{POST_TEMPLATE}</ul>{/POST_TEMPLATE} | ||
[/tmpn] | ||
[jsonq | ||
query="select sku,description from products where description like '%Nails%'" | ||
template="[scratch tpl]" hash=1 content-type="text/html" | ||
] | ||
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Will produce something like this when the query is run: | ||
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<ul> | ||
<li>os28057a - 16 Penny Nails</li> | ||
<li>os28057b - 10 Penny Nails</li> | ||
<li>os28057c - 8 Penny Nails</li> | ||
</ul> | ||
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This will work no matter the state of the C<hash> parameter, as the fields are | ||
determined. (It is probably best to use hash=1 for this query.) | ||
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=item content-type | ||
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This parameter will allow you to change the MIME type of the output from | ||
the default of C<application/json>. | ||
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=back | ||
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=head2 URL | ||
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Here is a typical URL generated (for a catalog with a VendURL of http://www.perusion.com/c/strap): | ||
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http://www.perusion.com/c/strap/qc/059aba1aaee1debb4ecd3c67dd039e80 | ||
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You can specify the URL intro with the C<intro> configuration parameter. | ||
When it is set to C<qc>, it disables any URLs in the catalog that | ||
begin with /qc/ and short circuits their delivery to the routine which | ||
generates JSON. | ||
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You can manage the presentation of the query with the C<mv_matchlimit> | ||
CGI parameter. If you specify C<mv_first_match> in addition, you can | ||
set up paging. (Note those are remapped to C<ml> and C<fm> in most | ||
standard Interchange catalogs. You should take account of this if | ||
using the external CGI method.) | ||
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NOTE: mv_first_match will not work without mv_matchlimit. | ||
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=head2 AUTHOR | ||
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Mike Heins, <mikeh@perusion.com> | ||
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=cut | ||
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EOD |
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