Ubuntu Manpage: yaz-ztest - Z39.50/SRU Test Server

NAME

       yaz-ztest - Z39.50/SRU Test Server

SYNOPSIS

       application [-install] [-installa] [-remove] [-a file] [-v level] [-l file] [-u uid] [-c config]
                   [-f vconfig] [-C fname] [-t minutes] [-k kilobytes] [-K] [-d daemon] [-w dir] [-p pidfile]
                   [-r kilobytes] [-ziDSTV1] [listener-spec...]

DESCRIPTION

       yaz-ztest is a Z39.50/SRU test server that uses the YAZ generic frontend server (GFS) API. The server
       acts as a real Z39.50/SRU server but does not use a database. It returns a random hit count and returns a
       subset of a few built-in records.

       The listener-spec consists of a transport mode followed by a colon, followed by a listener address. The
       transport mode is either tcp, unix, or ssl.

       For TCP and SSL, an address has the form:

               hostname | IP-number [ : portnumber ]

       For UNIX local socket, the address is the filename of the local socket.

OPTIONS

-a file
Specify a file for dumping PDUs (for diagnostic purposes). The special name - (dash) sends output to
stderr.

-S
Don't fork or make threads on connection requests. This is good for debugging, but not recommended
for real operation: Although the server is asynchronous and non-blocking, it can be nice to keep a
software malfunction (okay then, a crash) from affecting all current users.

-1
Like -S but after one session the server exits. This mode is for debugging only.

-T
Operate the server in threaded mode. The server creates a thread for each connection rather than fork
a process. Only available on UNIX systems that offer POSIX threads.

-s
Use the SR protocol (obsolete).

-z
Use the Z39.50 protocol (default). This option and -s complement each other. You can use both
multiple times on the same command line, between listener-specifications (see below). This way, you
can set up the server to listen for connections in both protocols concurrently, on different local
ports.

-l file
The logfile.

-c config
A user option that serves as a specifier for some sort of configuration, usually a filename. The
argument to this option is transferred to member configname of the statserv_options_block.

-f vconfig
This specifies an XML file that describes one or more YAZ frontend virtual servers.

-C fname
Sets SSL certificate file name for server (PEM).

-v level
The log level. Use a comma-separated list of members of the set
{fatal,debug,warn,log,malloc,all,none}.

-u uid
Set user ID. Sets the real UID of the server process to that of the given user. It's useful if you
aren't comfortable with having the server run as root, but you need to start it as such to bind a
privileged port.

-w dir
The server changes to this directory before listening to incoming connections. This option is useful
when the server is operating from the inetd daemon (see -i).

-p pidfile
Specifies that the server should write its Process ID to the file given by pidfile. A typical
location would be /var/run/yaz-ztest.pid.

-i
Use this to make the the server run from the inetd server (UNIX only).

-D
Use this to make the server put itself in the background and run as a daemon. If neither -i nor -D is
given, the server starts in the foreground.

-install
Use this to install the server as an NT service (Windows NT/2000/XP only). Control the server by
going to the Services in the Control Panel.

-installa
Use this to install the server as an NT service and mark it as "auto-start. Control the server by
going to the Services in the Control Panel.

-remove
Use this to remove the server from the NT services (Windows NT/2000/XP only).

-t minutes
Idle session timeout, in minutes.

-k size
Maximum record size/message size, in kilobytes.

-K
Forces no-keepalive for HTTP sessions. By default GFS will keep sessions alive for HTTP 1.1 sessions
(as defined by the standard). Using this option will force GFS to close the connection for each
operation.

-r size
Maximum size of log file before rotation occurs, in kilobytes. Default size is 1048576 k (=1 GB).

-d daemon
Set name of daemon to be used in hosts access file. See hosts_access(5) and tcpd(8).

-m time-format
Sets the format of time-stamps in the log-file. Specify a string in the input format to strftime().

-V
Display YAZ version and exit.

TESTING

       yaz-ztest normally returns a random hit count between 0 and 24. However, if a query term includes leading
       digits, then the integer value of that term is used as hit count. This allows testers to return any
       number of hits.  yaz-ztest includes 24 MARC records for testing. Hit counts exceeding 24 will make
       yaz-ztest return the same record batch over and over. So record at position 1, 25, 49, etc. are
       equivalent.

       For XML, if no element set is given or element has value "marcxml", MARCXML is returned (each of the 24
       dummy records converted from ISO2709 to XML). For element set OP, then OPAC XML is returned.

       yaz-ztest may also return predefined XML records (for testing). This is enabled if YAZ_ZTEST_XML_FETCH
       environment variable is defined. A record is fetched from a file (one record per file). The path for the
       filename is FE.d.xml where F is the YAZ_ZTEST_XML_FETCH value (possibly empty), E is element-set, d is
       record position (starting from 1).

       The following databases are honored by yaz-ztest: Default, slow and db.*  (all databases with prefix
       "db"). Any other database will make yaz-ztest return diagnostic 109: "Database unavailable".

       Options for search may be included in the form or URL get arguments included as part of the Z39.50
       database name. The following database options are present: search-delay, present-delay, fetch-delay and
       seed.

       The former, delay type options, specify a fake delay (sleep) that yaz-ztest will perform when searching,
       presenting, fetching records respectively. The value of the delay may either be a fixed floating point
       value which specifies the delay in seconds. Alternatively the value may be given as two floating point
       numbers separated by colon, which will make yaz-ztest perform a random sleep between the first and second
       number.

       The database parameter seed takes an integer as value. This will call srand with this integer to ensure
       that the random behavior can be re-played.

       Suppose we want searches to take between 0.1 and 0.5 seconds and a fetch to take 0.2 second. To access
       test database Default we'd use: Default?search-delay=0.1:0.5&fetch-delay=0.2.

GFS CONFIGURATION AND VIRTUAL HOSTS

       The Virtual hosts mechanism allows a YAZ frontend server to support multiple backends. A backend is
       selected on the basis of the TCP/IP binding (port+listening adddress) and/or the virtual host.

       A backend can be configured to execute in a particular working directory. Or the YAZ frontend may perform
       CQL to RPN conversion, thus allowing traditional Z39.50 backends to be offered as a SRW/SRU service.
       SRW/SRU Explain information for a particular backend may also be specified.

       For the HTTP protocol, the virtual host is specified in the Host header. For the Z39.50 protocol, the
       virtual host is specified as in the Initialize Request in the OtherInfo, OID 1.2.840.10003.10.1000.81.1.

           Note
           Not all Z39.50 clients allow the VHOST information to be set. For those, the selection of the backend
           must rely on the TCP/IP information alone (port and address).

       The YAZ frontend server uses XML to describe the backend configurations. Command-line option -f specifies
       filename of the XML configuration.

       The configuration uses the root element yazgfs. This element includes a list of listen elements, followed
       by one or more server elements.

       The listen describes listener (transport end point), such as TCP/IP, Unix file socket or SSL server.
       Content for a listener:

       CDATA (required)
           The CDATA for the listen element holds the listener string, such as tcp:@:210, tcp:server1:2100, etc.

       attribute id (optional)
           Identifier for this listener. This may be referred to from server sections.

           Note
           We expect more information to be added for the listen section in a future version, such as CERT file
           for SSL servers.

       The server describes a server and the parameters for this server type. Content for a server:

       attribute id (optional)
           Identifier for this server. Currently not used for anything, but it might be for logging purposes.

       attribute listenref (optional)
           Specifies one or more listeners for this server. Each server ID is separated by a comma. If this
           attribute is not given, the server is accessible from all listeners. In order for the server to be
           used for real, however, the virtual host must match if specified in the configuration.

       element config (optional)
           Specifies the server configuration. This is equivalent to the config specified using command line
           option -c.

       element directory (optional)
           Specifies a working directory for this backend server. If specified, the YAZ frontend changes current
           working directory to this directory whenever a backend of this type is started (backend handler
           bend_start), stopped (backend handler hand_stop) and initialized (bend_init).

       element host (optional)
           Specifies the virtual host for this server. If this is specified a client must specify this host
           string in order to use this backend.

       element cql2rpn (optional)
           Specifies a filename that includes CQL to RPN conversion for this backend server. See ???. If given,
           the backend server will only "see" a Type-1/RPN query.

       element ccl2rpn (optional)
           Specifies a filename that includes CCL to RPN conversion for this backend server. See ???. If given,
           the backend server will only "see" a Type-1/RPN query.

       element stylesheet (optional)
           Specifies the stylesheet reference to be part of SRU HTTP responses when the client does not specify
           one. If none is given, then if the client does not specify one, then no stylesheet reference is part
           of the SRU HTTP response.

       element client_query_charset (optional)
           If specified, a conversion from the character set given to UTF-8 is performed by the generic frontend
           server. It is only executed for Z39.50 search requests (SRU/Solr are assumed to be UTF-8 encoded
           already).

       element docpath (optional)
           Specifies a path for local file access using HTTP. All URLs with a leading prefix (/ excluded) that
           matches the value of docpath are used for file access. For example, if the server is to offer access
           in directory xsl, the docpath would be xsl and all URLs of the form http://host/xsl will result in a
           local file access.

       element explain (optional)
           Specifies SRW/SRU ZeeRex content for this server. Copied verbatim to the client. As things are now,
           some of the Explain content seem redundant because host information, etc. is also stored elsewhere.

       element maximumrecordsize (optional)
           Specifies maximum record size/message size, in bytes. This value also serves as the maximum size of
           incoming packages (for Record Updates etc). It's the same value as that given by the -k option.

       element retrievalinfo (optional)
           Enables the retrieval facility to support conversions and specifications of record formats/types. See
           ???  for more information.

       The XML below configures a server that accepts connections from two ports, TCP/IP port 9900 and a local
       UNIX file socket. We name the TCP/IP server public and the other server internal.

            <yazgfs>
             <listen id="public">tcp:@:9900</listen>
             <listen id="internal">unix:/var/tmp/socket</listen>
             <server id="server1">
               <host>server1.mydomain</host>
               <directory>/var/www/s1</directory>
               <config>config.cfg</config>
             </server>
             <server id="server2" listenref="public,internal">
               <host>server2.mydomain</host>
               <directory>/var/www/s2</directory>
               <config>config.cfg</config>
               <cql2rpn>../etc/pqf.properties</cql2rpn>
               <explain xmlns="http://explain.z3950.org/dtd/2.0/">
                 <serverInfo>
                   <host>server2.mydomain</host>
                   <port>9900</port>
                   <database>a</database>
                 </serverInfo>
               </explain>
             </server>
             <server id="server3" listenref="internal">
               <directory>/var/www/s3</directory>
               <config>config.cfg</config>
             </server>
            </yazgfs>

       There are three configured backend servers. The first two servers, "server1" and "server2", can be
       reached by both listener addresses.  "server1" is reached by all (two) since no listenref attribute is
       specified.  "server2" is reached by the two listeners specified. In order to distinguish between the two,
       a virtual host has been specified for each server in the host elements.

       For "server2" elements for CQL to RPN conversion is supported and explain information has been added (a
       short one here to keep the example small).

       The third server, "server3" can only be reached via listener "internal".

FILES

       yaz-<version>/ztest/yaz-ztest.c

       yaz-<version>/include/yaz/backend.h

AUTHORS

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