Provided by: yaz_4.2.30-4build2_amd64 
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] [-ziDST1] [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 a fork a process. Only available on UNIX systems that offers 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 during before listening on 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 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 and activate the server as an NT service (Windows NT/2000/XP
only). 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().
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.
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 wil 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 allows 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 listener for this server. If this attribute is not given, the server is
accessible from all listener. In order for the server to be used for real, howeever,
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 specifid, the YAZ fronend
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 neither this is given, nor the client specifies one, no
stylesheet reference is part of the SRU HTTP response.
element docpath (optional)
Specifies a path for local file access using HTTP. All URLs with a leading prefix (/
exluded) 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/exl 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 seeem redundant because host information,
etc. is also stored elsewhere.
element maximumrecordsize (optional)
Specifies maximum record size/message size, in bytes. This value also servers as
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 supporting 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">
<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 - since no listenref attribute is
specified. In order to distinguish between the two a virtual host has been specified for
each of 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
SEE ALSO
yaz(7) yaz-log(7)