-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
<!ENTITY copyright SYSTEM "copyright.xml">
<!ENTITY % idcommon SYSTEM "common/common.ent">
<productname>Metaproxy</productname>
<info><orgname>Index Data</orgname></info>
</refentryinfo>
-
+
<refmeta>
<refentrytitle>zoom</refentrytitle>
<manvolnum>3mp</manvolnum>
<refmiscinfo class="manual">Metaproxy Module</refmiscinfo>
</refmeta>
-
+
<refnamediv>
<refname>zoom</refname>
<refpurpose>Metaproxy ZOOM Module</refpurpose>
</refnamediv>
-
+
<refsect1>
<title>DESCRIPTION</title>
<para>
This filter implements a generic client based on
<ulink url="&url.yaz.zoom;">ZOOM</ulink> of YAZ.
The client implements the protocols that ZOOM C does: Z39.50, SRU
- (GET, POST, SOAP) and SOLR .
+ (GET, POST, SOAP) and Solr .
</para>
-
+
<para>
This filter only deals with Z39.50 on input. The following services
are supported: init, search, present and close. The backend target
<refsect1>
<title>CONFIGURATION</title>
<para>
- The configuration consists of five parts: <literal>torus</literal>,
+ The configuration consists of six parts: <literal>torus</literal>,
<literal>fieldmap</literal>, <literal>cclmap</literal>,
- <literal>contentProxy</literal> and <literal>log</literal>.
+ <literal>contentProxy</literal>, <literal>log</literal>
+ and <literal>zoom</literal>.
</para>
<refsect2>
<title>torus</title>
<term>attribute <literal>url</literal></term>
<listitem>
<para>
- URL of Web service to be used to fetch target profile
- for a given database (udb) of type searchable. The special sequence
- <literal>%db</literal> of the URL is replaced by the
- actual database specified as part of Search.
+ URL of Web service to be used when fetch target profiles from
+ a remote service (Torus normally).
+ </para>
+ <para>
+ The sequence <literal>%query</literal> is replaced with a CQL
+ query for the Torus search.
</para>
<para>
The special sequence <literal>%realm</literal> is replaced by value
of attribute <literal>realm</literal> or by realm DATABASE argument.
</para>
+ <para>
+ The special sequence <literal>%db</literal> is replaced with
+ a single database while searching. Note that this sequence
+ is no longer needed, because the <literal>%query</literal> can already
+ query for a single database by using CQL query
+ <literal>udb==...</literal>.
+ </para>
</listitem>
</varlistentry>
<varlistentry>
</para>
</listitem>
</varlistentry>
+ <varlistentry id="auth_url">
+ <term>attribute <literal>auth_url</literal></term>
+ <listitem>
+ <para>
+ URL of Web service to be used to for auth/IP lookup. If this
+ defined, all access is granted or denied as part of Z39.50 Init
+ by the ZOOM module and the use of database parameters realm and
+ torus_url is not allowed. If this setting is not defined,
+ all access is allowed and realm and/or torus_url may be used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry id="auth_hostname">
+ <term>attribute <literal>auth_hostname</literal></term>
+ <listitem>
+ <para>
+ Limits IP lookup to a given logical hostname.
+ </para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term>attribute <literal>realm</literal></term>
<listitem>
<para>
The default realm value. Used for %realm in URL, unless
- specified in DATABASE argument.
+ specified in DATABASE parameter.
</para>
</listitem>
</varlistentry>
</listitem>
</varlistentry>
<varlistentry>
+ <term>attribute <literal>explain_xsl</literal></term>
+ <listitem>
+ <para>
+ Specifies a stylesheet that converts one or more Torus records
+ to ZeeExplain records. The content of recordData is assumed to be
+ holding each Explain record.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>attribute <literal>record_xsl</literal></term>
+ <listitem>
+ <para>
+ Specifies a stylesheet that converts retrieval records after
+ transform/literal operations.
+ </para>
+ <para>
+ When Metaproxy creates a content proxy session, the XSL parameter
+ <literal>cproxyhost</literal> is passed to the transform.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term>element <literal>records</literal></term>
<listitem>
<para>
</para>
<variablelist>
<varlistentry>
+ <term>attribute <literal>config_file</literal></term>
+ <listitem>
+ <para>
+ Specifies the file that configures the cf-proxy system. Metaproxy
+ uses setting <literal>sessiondir</literal> and
+ <literal>proxyhostname</literal> from that file to configure
+ name of proxy host and directory of parameter files for the cf-proxy.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term>attribute <literal>server</literal></term>
<listitem>
<para>
host[:port]. That is without a method (such as HTTP) and optional
port number.
</para>
+ <note>
+ <para>
+ This setting is deprecated. Use the config_file (above)
+ to inform about the proxy server.
+ </para>
+ </note>
</listitem>
</varlistentry>
<varlistentry>
using the mkstemp(3) system call. The default value of this
setting is <literal>/tmp/cf.XXXXXX.p</literal>.
</para>
+ <note>
+ <para>
+ This setting is deprecated. Use the config_file (above)
+ to inform about the session file area.
+ </para>
+ </note>
</listitem>
</varlistentry>
</variablelist>
</varlistentry>
</variablelist>
</refsect2>
+
+ <refsect2>
+ <title>zoom</title>
+ <para>
+ The <literal>zoom</literal> element controls settings for the
+ ZOOM.
+ </para>
+ <variablelist>
+ <varlistentry>
+ <term>attribute <literal>timeout</literal></term>
+ <listitem>
+ <para>
+ Is an integer that specifies, in seconds, how long an operation
+ may take before ZOOM gives up. Default value is 40.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>attribute <literal>proxy_timeout</literal></term>
+ <listitem>
+ <para>
+ Is an integer that specifies, in seconds, how long an operation
+ a proxy check will wait before giving up. Default value is 1.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect2>
+
</refsect1>
<refsect1>
<title>QUERY HANDLING</title>
</para>
<para>
Step 1: for CCL, the query is converted to RPN via
- <link linkend="cclmap"><literal>cclmap</literal></link> elements part of
- the target profile as well as
+ <link linkend="zoom-torus-cclmap"><literal>cclmap</literal></link>
+ elements part of
+ the target profile as well as
<link linkend="cclmap_base">base CCL maps</link>.
</para>
<para>
<para>
Step 2: If the target is Z39.50-based, it is passed verbatim (RPN).
If the target is SRU-based, the RPN will be converted to CQL.
- If the target is SOLR-based, the RPN will be converted to SOLR's query
+ If the target is Solr-based, the RPN will be converted to Solr's query
type.
</para>
</refsect1>
-
+
<refsect1>
<title>SORTING</title>
<para>
The ZOOM module actively handle CQL sorting - using the SORTBY parameter
which was introduced in SRU version 1.2. The conversion from SORTBY clause
- to native sort for some target is driven by the two parameters:
- <link linkend="sortStrategy"><literal>sortStrategy</literal></link>
- and <link linkend="sortmap"><literal>sortmap_</literal><replaceable>field</replaceable></link>.
+ to native sort for some target is driven by the two parameters:
+ <link linkend="zoom-torus-sortStrategy">
+ <literal>sortStrategy</literal>
+ </link>
+ and <link linkend="zoom-torus-sortmap">
+ <literal>sortmap_</literal><replaceable>field</replaceable>
+ </link>.
</para>
<para>
If a sort field that does not have an equivalent
conversion. It doesn't throw a diagnostic.
</para>
</refsect1>
-
+
<refsect1>
<title>TARGET PROFILE</title>
<para>
</para>
</listitem>
</varlistentry>
-
- <varlistentry id="cclmap">
+
+ <varlistentry>
+ <term id="zoom-torus-authenticationMode">authenticationMode</term><listitem>
+ <para>
+ Specifies how authentication parameters are passed to server
+ for SRU. Possible values are: <literal>url</literal>
+ and <literal>basic</literal>. For the url mode username and password
+ are carried in URL arguments x-username and x-password.
+ For the basic mode, HTTP basic authentication is used.
+ The settings only takes effect
+ if <link linkend="zoom-torus-authentication">authentication</link>
+ is set.
+ </para>
+ <para>
+ If this value is omitted HTTP basic authencation is used.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry id="zoom-torus-cclmap">
<term>cclmap_<replaceable>field</replaceable></term><listitem>
<para>
This value specifies CCL field (qualifier) definition for some
</para>
</listitem>
</varlistentry>
-
+
<varlistentry>
<term>cfAuth</term><listitem>
<para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term id="zoom-torus-contentAuthentication">contentAuthentication</term><listitem>
+ <para>
+ Specifies authentication info to be passed to a content connector.
+ This is only used if content-user and content-password are omitted.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="zoom-torus-contentConnector">
<term>contentConnector</term><listitem>
<para>
<literal>element_raw</literal> from the configuration.
By default that is the element sets <literal>pz2</literal>
and <literal>raw</literal>.
- If record transform is not enabled, this setting is
+ If record transform is not enabled, this setting is
not used and the element set specified by the client
is passed verbatim.
</para>
</para>
</listitem>
</varlistentry>
-
+
<varlistentry>
<term>piggyback</term><listitem>
<para>
</para>
</listitem>
</varlistentry>
-
+
<varlistentry>
<term>queryEncoding</term><listitem>
<para>
</para>
</listitem>
</varlistentry>
-
+
<varlistentry>
<term>recordEncoding</term><listitem>
<para>
</listitem>
</varlistentry>
- <varlistentry id="sortmap">
+ <varlistentry id="zoom-torus-sortmap">
<term>sortmap_<replaceable>field</replaceable></term><listitem>
<para>
This value the native field for a target. The form of the value is
- given by <link linkend="sortStrategy">sortStrategy</link>.
+ given by <link linkend="zoom-torus-sortStrategy">sortStrategy</link>.
</para>
</listitem>
</varlistentry>
-
- <varlistentry id="sortStrategy">
+
+ <varlistentry id="zoom-torus-sortStrategy">
<term>sortStrategy</term><listitem>
<para>
Specifies sort strategy for a target. One of:
</para>
</listitem>
</varlistentry>
-
+
<varlistentry>
<term>sru</term><listitem>
<para>
</listitem>
</varlistentry>
- <varlistentry>
+ <varlistentry id="sruVersion">
<term>sruVersion</term><listitem>
<para>
Specifies the SRU version to use. It unset, version 1.2 will be
</listitem>
</varlistentry>
- <varlistentry>
+ <varlistentry id="transform">
<term>transform</term><listitem>
<para>
Specifies a XSL stylesheet filename to be used if record
</listitem>
</varlistentry>
- <varlistentry>
+ <varlistentry id="udb">
<term>udb</term><listitem>
<para>
This value is required and specifies the unique database for
<para>
The value of this field is a string that generates a dynamic link
based on record content. If the resulting string is non-zero in length
- a new field, <literal>metadata</literal> with attribute
+ a new field, <literal>metadata</literal> with attribute
<literal>type="generated-url"</literal> is generated.
The contents of this field is the result of the URL recipe conversion.
The urlRecipe value may refer to an existing metadata element by
metadata element <literal>title</literal> and converts one or more
spaces to a plus character.
</para>
- <para>
- If the <link linkend="zoom-torus-contentConnector">contentConnector</link>
- setting also defined, the resulting value is
- augmented with a session string as well as host name of the
- content proxy server.
- </para>
</listitem>
</varlistentry>
-
- <varlistentry>
+
+ <varlistentry id="zurl">
<term>zurl</term><listitem>
<para>
This is setting is mandatory and specifies the ZURL of the
is a comma rather than a question mark. What follows question mark are
HTTP arguments (in this case SRU arguments).
</para>
- <variablelist>
+ <para>
+ The database parameters, in alphabetical order, are:
+ </para>
+ <variablelist>
<varlistentry>
- <term>user</term>
+ <term>content-password</term>
<listitem>
<para>
- Specifies user to be passed to backend. If this parameter is
- omitted, the user will be taken from TARGET profile setting
- <link linkend="zoom-torus-authentication">
- <literal>authentication</literal>
- </link>
- .
+ The password to be used for content proxy session. If this parameter
+ is not given, value of parameter <literal>password</literal> is passed
+ to content proxy session.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>content-proxy</term>
+ <listitem>
+ <para>
+ Specifies proxy to be used for content proxy session. If this parameter
+ is not given, value of parameter <literal>proxy</literal> is passed
+ to content proxy session.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>content-user</term>
+ <listitem>
+ <para>
+ The user to be used for content proxy session. If this parameter
+ is not given, value of parameter <literal>user</literal> is passed
+ to content proxy session.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>cproxysession</term>
+ <listitem>
+ <para>
+ Specifies the session ID for content proxy. This parameter is, generally,
+ not used by anything but the content proxy itself when invoking
+ Metaproxy via SRU.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>nocproxy</term>
+ <listitem>
+ <para>
+ If this parameter is specified, content-proxying is disabled
+ for the search.
</para>
</listitem>
</varlistentry>
<term>password</term>
<listitem>
<para>
- Specifies password to be passed to backend. If this parameters is
- omitted, the password will be taken from TARGET profile setting
+ Specifies password to be passed to backend. It is also passed
+ to content proxy session unless overriden by content-password.
+ If this parameter is omitted, the password will be taken from
+ TARGET profile setting
<link linkend="zoom-torus-authentication">
<literal>authentication</literal>
</link>
<term>proxy</term>
<listitem>
<para>
- Specifies proxy to be for backend. If this parameters is
+ Specifies one or more proxies for backend. If this parameter is
omitted, the proxy will be taken from TARGET profile setting
<link linkend="zoom-torus-cfproxy">
- <literal>cfProxy</literal>
- </link>
- .
+ <literal>cfProxy</literal></link>.
+ The parameter is a list of comma-separated host:port entries.
+ Bost host and port must be given for each proxy.
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>cproxysession</term>
+ <term>realm</term>
<listitem>
<para>
- Session ID for content proxy. This parameter is, generally,
- not used by anything but the content proxy itself.
+ Session realm to be used for this target, changed the resulting
+ URL to be used for getting a target profile, by changing the
+ value that gets substituted for the %realm string. This parameter
+ is not allowed if access is controlled by
+ <link linkend="auth_url">auth_url</link>
+ in configuration.
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>realm</term>
+ <term>retry</term>
<listitem>
<para>
- Session realm to be used for this target, changed the resulting
- URL to be used for getting a target profile, by changing the
- value that gets substituted for the %realm string.
+ Optional paramater. If the value is 0, retry on failure is
+ disabled for the ZOOM module. Any other value enables retry
+ on failure. If this parameter is omitted, then the value of
+ <literal>retryOnFailure</literal>
+ from the Torus record is used (same values).
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>torus_url</term>
+ <listitem>
+ <para>
+ Sets the URL to be used for Torus records fetch - overriding value
+ of <literal>url</literal> attribute of element <literal>torus</literal>
+ in zoom configuration. This parameter is not allowed if access is
+ controlled by
+ <link linkend="auth_url">auth_url</link> in configuration.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>user</term>
+ <listitem>
+ <para>
+ Specifies user to be passed to backend. It is also passed
+ to content proxy session unless overriden by content-user.
+ If this parameter is omitted, the user will be taken from TARGET
+ profile setting
+ <link linkend="zoom-torus-authentication">
+ <literal>authentication</literal>
+ </link>
+ .
</para>
</listitem>
</varlistentry>
</para>
</listitem>
</varlistentry>
- </variablelist>
+ </variablelist>
</refsect1>
<refsect1>
<title>SCHEMA</title>
<literallayout><xi:include
xi:href="../xml/schema/filter_zoom.rnc"
- xi:parse="text"
+ xi:parse="text"
xmlns:xi="http://www.w3.org/2001/XInclude" />
</literallayout>
</refsect1>
-
+
<refsect1>
<title>EXAMPLES</title>
<para>
- The following configuration illustrates most of the
- facilities:
+ In example below Target definitions (Torus records) are fetched
+ from a web service via a proxy. A CQL profile is configured which
+ maps to a set of CCL fields ("no field", au, tu and su). Presumably
+ the target definitions fetched maps the CCL to their native RPN.
+ A CCL "ocn" is mapped for all targets. Logging of APDUs are enabled,
+ and a timeout is given.
<screen><![CDATA[
<filter type="zoom">
<torus
- url="http://torus.indexdata.com/src/records/?query=udb%3D%db"
+ url="http://torus.indexdata.com/src/records/?query=%query"
proxy="localhost:3128"
/>
<fieldmap cql="cql.anywhere"/>
<fieldmap cql="dc.creator" ccl="au"/>
<fieldmap cql="dc.title" ccl="ti"/>
<fieldmap cql="dc.subject" ccl="su"/>
-
+
<cclmap>
<qual name="ocn">
<attr type="u" value="12"/>
</qual>
</cclmap>
<log apdu="true"/>
+ <zoom timeout="40"/>
</filter>
]]>
</screen>
</para>
-
- </refsect1>
-
+
+ <para>
+ Here is another example with two locally defined targets: A
+ Solr target and a Z39.50 target.
+ <screen><![CDATA[
+ </filter>
+ <filter type="zoom">
+ <torus>
+ <records>
+ <record>
+ <udb>ocs-test</udb>
+ <cclmap_term>t=z</cclmap_term>
+ <cclmap_ti>u=title t=z</cclmap_ti>
+ <sru>solr</sru>
+ <zurl>ocs-test.indexdata.com/solr/select</zurl>
+ </record>
+ <record>
+ <udb>loc</udb>
+ <cclmap_term>t=l,r</cclmap_term>
+ <cclmap_ti>u=4 t=l,r</cclmap_ti>
+ <zurl>z3950.loc.gov:7090/voyager</zurl>
+ </record>
+ </records>
+ </torus>
+ <fieldmap cql="cql.serverChoice"/>
+ <fieldmap cql="dc.title" ccl="ti"/>
+ </filter>
+]]>
+ </screen>
+ </para>
+ </refsect1>
+
<refsect1>
<title>SEE ALSO</title>
<para>
</citerefentry>
</para>
</refsect1>
-
+
©right;
</refentry>
projects / metaproxy-moved-to-github.git / blobdiff