GLOBUS ASCII HELPER PROTOCOL VERSION 1.0.9 Todd Tannenbaum [tannenba@cs.wisc.edu] June 2005 HTCondor Project [http://research.cs.wisc.edu/htcondor] Department of Computer Sciences University of Wisconsin-Madison 1210 W. Dayton Street Madison, WI 53706 [http://www.cs.wisc.edu] 1. INTRODUCTION The objective of the Globus ASCII Helper Protocol (GAHP) is to provide services from the Globus Toolkit via a simple ASCII-based protocol. A process which implements GAHP is referred to as a GAHP server. GAHP is designed to handle both synchronous (blocking) and asynchronous (non-blocking) calls. The first GAHP specification focuses upon GRAM, GASS, MyPROXY, and DUROC grid services. This document assumes the reader is familiar with general Globus Toolkit concepts and functionality. 1.1 WHY GAHP? Although the Globus Toolkit provides a C API and implementation, and CoG kits based upon Globus technology provide bindings in a variety of other languages, there are several distinct advantages to using an independent GAHP server process instead of linking a library into a body of existing code. For instance, parts of the native Globus Toolkit API provide only synchronous/blocking calls. Toolkit users which require a non-blocking/asynchronous interface must make use of multiple threads, which is assisted by the fact that the Globus Toolkit is thread-safe. However, thread safety requires that _all_ modules linked into the process be both re-entrant and in agreement upon a threading model. This may be a significant barrier when trying to integrate Globus Toolkit services into legacy non-thread-safe code, or when attempting to link with commercial libraries which either have no support for threads or define their own threading model. But because the GAHP server runs as a separate process, it can be easily implemented as a multi-threaded server, and still present an asynchronous non-blocking protocol. GAHP facilitates the construction of multi-tier systems. A first tier client can easily send ASCII commands via a socket (perhaps securely via an SSH or SSL tunnel) to a second tier running a GAHP server, allowing Grid services to be consolidated at the second or third tier with minimal effort. Furthermore GAHP, like many other simple ASCII-based protocols, supports the concept of component-based development independent of the software language used with minimal complexity. The C API for Globus technologies differs from the Java bindings which differs from the Perl bindings. By using GAHP, a body of software could be written once with one interface and then subsequently utilize a GAHP server written in C, Java, or Perl -- and said GAHP server could be running locally or as a daemon on a remote host. Does this sound like many of the same advantages often associated with web services? Absolutely. The "GAHP" is intended to "fill the gap" until grid services are exposed as either web services or via the Open Grid Services Architecture (OGSA). But this could take quite some time -- until then, the GAHP protocol is useful to satisfy immediate needs. The protocol is designed first and foremost for the ease and rapid development of GAHP servers. 1.2 AVAILABLE GAHP SERVERS The HTCondor Project at University of Wisconsin-Madison has developed a GAHP server written in C using pthreads and the Globus Toolkit client libraries. Most Unix platforms are supported. The National Computing Science Alliance (NCSA) has developed a GAHP server written in pure Java, using the Java CoG. Any platform with a Java 1.2 virtual machine available can run this GAHP server. Both are available from http://research.cs.wisc.edu/htcondor/gahp 2.0 GAHP SERVER IMPLEMENTATION GAHP itself, as a protocol, is independent of the underlying transport protocol and requires only a reliable ordered data stream channel. A GAHP server, however, is assumed to read and respond to GAHP command solely via stdin and stdout. Should stdin to a GAHP server be closed, the GAHP server should immediately shutdown in a manner similar to the receipt of a QUIT command. Therefore, a GAHP server can be easily invoked and managed via SSHD, inted, or rshd. Software can spawn a local GAHP server via an interface such as POSIX.2 popen(). Under no circumstances should a GAHP server block when issued any command. All commands need to return nearly instantaneously. Therefore, most GAHP servers will be implemented as a multi-threaded process. 3.0 GAHP COMMANDS The following commands can be recognized in GAHP as of version 1.0.0 of the protocol: ASYNC_MODE_ON ASYNC_MODE_OFF COMMANDS GASS_SERVER_INIT GRAM_CALLBACK_ALLOW GRAM_ERROR_STRING GRAM_JOB_CALLBACK_REGISTER GRAM_JOB_CANCEL GRAM_JOB_REQUEST GRAM_JOB_SIGNAL GRAM_JOB_STATUS GRAM_JOB_REFRESH_PROXY GRAM_PING INITIALIZE_FROM_FILE INITIALIZE_FROM_MYPROXY MYPROXY_DELEGATE MYPROXY_DESTROY MYPROXY_REFRESH MYPROXY_RETRIEVE PROXY_INFO QUIT REFRESH_PROXY_FROM_FILE CACHE_PROXY_FROM_FILE RESULTS VERSION RESPONSE_PREFIX USE_CACHED_PROXY UNCACHE_PROXY Not all commands defined in the protocol must be implemented; the existence of some commands will vary between GAHP server implementations. However, the following list of commands represents the minimum implementation that is required for all servers: COMMANDS GASS_SERVER_INIT GRAM_CALLBACK_ALLOW GRAM_JOB_CALLBACK_REGISTER GRAM_JOB_CANCEL GRAM_JOB_REQUEST GRAM_JOB_SIGNAL GRAM_JOB_STATUS GRAM_PING INITIALIZE_FROM_FILE QUIT RESULTS VERSION 3.1 CONVENTIONS AND TERMS USED IN SECTION 3.2 Below are definitions for the terms used in the sections to follow: The characters carriage return and line feed (in that order), _or_ solely the line feed character. The space character. line A sequence of ASCII characters ending with a . Request Line A request for action on the part of the GAHP server. Return Line A line immediately returned by the GAHP server upon receiving a Request Line. Result Line A line sent by the GAHP server in response to a RESULTS request, which communicates the results of a previous asynchronous command Request. S: and R: In the Example sections for the commands below, the prefix "S: " is used to signify what the client sends to the GAHP server. The prefix "R: " is used to signify what the client receives from the GAHP server. Note that the "S: " or "R: " should not actually be sent or received. 3.2 GAHP COMMAND STRUCTURE GAHP commands consist of three parts: * Request Line * Return Line * Result Line Each of these "Lines" consists of a variable length character string ending with the character sequence . A Request Line is a request from the client for action on the part of the GAHP server. Each Request Line consists of a command code followed by argument field(s). Command codes are a string of alphabetic characters. Upper and lower case alphabetic characters are to be treated identically with respect to command codes. Thus, any of the following may represent the gram_job_request command: gram_job_request Gram_Job_Request grAm_joB_reQUEst GRAM_JOB_REQUEST In contrast, the argument fields of a Request Line are _case sensitive_. The Return Line is always generated by the server as an immediate response to a Request Line. The first character of a Return Line will contain one the following characters: S - for Success F - for Failure E - for a syntax or parse Error Any Request Line which contains an unrecognized or unsupported command, or a command with an insufficient number of arguments, will generate an "E" response. The Result Line is used to support commands that would otherwise block. Any GAHP command which may require the implementation to block on network communication require a "request id" as part of the Request Line. For such commands, the Result Line just communicates if the request has been successfully parsed and queued for service by the GAHP server. At this point, the GAHP server would typically dispatch a new thread to actually service the request. Once the request has completed, the dispatched thread should create a Result Line and enqueue it until the client issues a RESULT command. 3.3 TRANSPARENCY Arguments on a particular Line (be it Request, Return, or Result) are typically separated by a . In the event that a string argument needs to contain a within the string itself, it may be escaped by placing a backslash ("\") in front of the character. Thus, the character sequence "\ " (no quotes) must not be treated as a separator between arguments, but instead as a space character within a string argument. 3.4 SEQUENCE OF EVENTS Upon startup, the GAHP server should output to stdout a banner string which is identical to the output from the VERSION command without the beginning "S " sequence (see example below). Next, the GAHP server should wait for a complete Request Line from the client (e.g. stdin). The server is to take no action until a Request Line sequence is received. At startup, allowable commands are limited to the following: COMMANDS INITIALIZE_FROM_FILE INITIALIZE_FROM_MYPROXY QUIT VERSION Once a successful INITIALIZE_* command is completed, any other command may be issued. If any command outside of the above list is issued before a successful INITIALIZE_* command, the Result Line should consist of : E Example: R: $GahpVersion: 1.0.0 Nov 26 2001 NCSA\ CoG\ Gahpd $ S: GRAM_PING 100 vulture.cs.wisc.edu/fork R: E S: RESULTS R: E S: COMMANDS R: S COMMANDS GRAM_JOB_CANCEL GRAM_JOB_REQUEST GRAM_JOB_SIGNAL GRAM_JOB_STATUS GRAM_PING INITIALIZE_FROM_FILE QUIT RESULTS VERSION S: VERSION R: S $GahpVersion: 1.0.0 Nov 26 2001 NCSA\ CoG\ Gahpd $ S: INITIALIZE_FROM_FILE /tmp/grid_proxy_554523.txt R: S S: GRAM_PING 100 vulture.cs.wisc.edu/fork R: S S: RESULTS R: S 0 S: RESULTS R: S 1 R: 100 0 S: QUIT R: S 3.4 COMMAND SYNTAX This section contains the syntax for the Request, Return, and Result line for each command. ----------------------------------------------- INITIALIZE_FROM_FILE Initialize the GAHP server and provide it with a GSI (Grid Security Infrastructure) proxy certificate which will be used by the GAHP server for all subsequent authentication which requires GSI credentials. + Request Line: INITIALIZE_FROM_FILE = a fully-qualified pathname to a file local to the GAHP server which contains a valid GSI proxied certificate. + Return Line: One of the following: S F Upon success, use the "S" version; if not recognized, use the "F" version. * error_string = brief string description of the error, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- COMMANDS List all the commands from this protocol specification which are implemented by this GAHP server. + Request Line: COMMANDS + Return Line: S ... + Result Line: None. ----------------------------------------------- VERSION Return the version string for this GAHP. The version string follows a specified format (see below). Ideally, the version entire version string, including the starting and ending dollar sign ($) delimiters, should be a literal string in the text of the GAHP server executable. This way, the Unix/RCS "ident" command can produce the version string. The version returned should correspond to the version of the protocol supported. + Request Line: VERSION + Return Line: S $GahpVesion: .. $ * major.minor.subminor = for this version of the protocol, use version 1.0.0. * build-month = string with the month abbreviation when this GAHP server was built or released. Permitted values are: "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", and "Dec". * build-day-of-month = day of the month when GAHP server was built or released; an integer between 1 and 31 inclusive. * build-year = four digit integer specifying the year in which the GAHP server was built or released. * general-descrip = a string identifying a particular GAHP server implementation. + Result Line: None. + Example: S: VERSION R: S $GahpVersion: 1.0.0 Nov 26 2001 NCSA\ CoG\ Gahpd $ ----------------------------------------------- ASYNC_MODE_ON Enable Asynchronous notification when the GAHP server has results pending for a client. This is most useful for clients that do not want to periodically poll the GAHP server with a RESULTS command. When asynchronous notification mode is active, the GAHP server will print out an 'R' (without the quotes) on column one when the 'RESULTS' command would return one or more lines. The 'R' is printed only once between successive 'RESULTS' commands. The 'R' is also guaranteed to only appear in between atomic return lines; the 'R" will not interrupt another command's output. If there are already pending results when the asynchronous results available mode is activated, no indication of the presence of those results will be given. A GAHP server is permitted to only consider changes to it's result queue for additions after the ASYNC_MODE_ON command has successfully completed. GAHP clients should issue a 'RESULTS' command immediately after enabling asynchronous notification, to ensure that any results that may have been added to the queue during the processing of the ASYNC_MODE_ON command are accounted for. + Request Line: ASYNC_MODE_ON + Return Line: S Immediately afterwards, the client should be prepared to handle an R appearing in the output of the GAHP server. + Result Line: None. + Example: S: ASYNC_MODE_ON R: S S: GRAM_PING 00001 beak.cs.wisc.edu/jobmanager R: S S: GRAM_PING 00002 nostos.cs.wisc.edu/jobmanager R: S R: R S: RESULTS R: S 2 R: 00001 0 R: 00002 0 Note that you are NOT guaranteed that the 'R' will not appear between the dispatching of a command and the return line(s) of that command; the GAHP server only guarantees that the 'R' will not interrupt an in-progress return. The following is also a legal example: S: ASYNC_MODE_ON R: S S: GRAM_PING 00001 beak.cs.wisc.edu/jobmanager R: S S: GRAM_PING 00002 nostos.cs.wisc.edu/jobmanager R: R R: S S: RESULTS R: S 2 R: 00001 0 R: 00002 0 (Note the reversal of the R and the S after GRAM_PING 00002) ----------------------------------------------- ASYNC_MODE_OFF Disable asynchronous results-available notification. In this mode, the only way to discover available results is to poll with the RESULTS command. This mode is the default. Asynchronous mode can be enable with the ASYNC_MODE_ON command. + Request Line: ASYNC_MODE_OFF + Return Line: S + Results Line: None + Example: S: ASYNC_MODE_OFF R: S ----------------------------------------------- RESPONSE_PREFIX Specify the prefix that the GAHP server use to prepend every subsequent line of output with. This may simplify parsing the output of the GAHP server by the client program, especially in cases where the responses of more one GAHP server are "collated" together. This affects the output of both return lines and result lines for all subsequent commands (NOT including this one). + Request Line: RESPONSE_PREFIX = an arbitrary string of characters which you want to prefix every subsequent line printed by the GAHP server. + Return Line: * result = the character "S" (no quotes) for successful submission of the prefix, or an "E" if this command was mal-formed. + Result Line: None. + Example: S: RESPONSE_PREFIX GAHP: R: S S: RESULTS R: GAHP:S 0 S: RESPONSE_PREFIX NEW_PREFIX_ R: GAHP:S S: RESULTS R: NEW_PREFIX_S 0 ----------------------------------------------- QUIT Free any/all system resources (close all sockets, etc) and terminate as quickly as possible. + Request Line: QUIT + Return Line: S Immediately afterwards, the command pipe should be closed and the GAHP server should terminate. + Result Line: None. ----------------------------------------------- RESULTS Display all of the Result Lines which have been queued since the last RESULTS command was issued. Upon success, the first return line specifies the number of subsequent Result Lines which will be displayed. Then each result line appears (one per line) -- each starts with the request ID which corresponds to the request ID supplied when the corresponding command was submitted. The exact format of the Result Line varies based upon which corresponding Request command was issued. IMPORTANT: Result Lines must be displayed in the _exact order_ in which they were queued!!! In other words, the Result Lines displayed must be sorted in the order by which they were placed into the GAHP's result line queue, from earliest to most recent. + Request Line: RESULTS + Return Line(s): S ... ... ... * reqid = integer Request ID, set to the value specified in the corresponding Request Line. + Result Line: None. + Example: S: RESULTS R: S 1 R: 100 0 ----------------------------------------------- GRAM_CALLBACK_ALLOW Create a TCP port on which it listens for responses from the Job Manager. A Result Line will be generated for each callback message sent to this socket. Note: Unlike other asynchronous command requests, the Request ID specified on the Request Line *cannot* be re-used after a Result Line with the same Request ID is returned. + Request Line: GRAM_CALLBACK_ALLOW * reqid = non-zero integer Request ID * requested_port = an integer with a requested TCP port number. If 0, then the subsequently created listen socket should be on a dynamic TCP port. If non-zero, then the listen socket should be created on this port _if possible_. It is not an error condition if the requested port cannot be used. + Return Line: One of the following: S F On success, use the "S" version; otherwise use the "F" version. * callback_contact = a string representing this callback channel; to be subsequently used with GRAM_JOB_REQUEST and/or GRAM_JOB_CALLBACK_REGISTER commands. * error_string = brief string description of the error_code, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- GRAM_ERROR_STRING Retrieve brief string description of an error code obtained in the Result Line of any command that starts with "GRAM". + Request Line: GRAM_ERROR_STRING * error_code = integer error code obtained from the Result Line of any command that starts with "GRAM". + Return Line: One of the following: S F Unknown\ Error If is recognized, use the "S" version; if not recognized, use the "F" version. * error_string = brief string description of the error_code, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- GRAM_JOB_REQUEST Submit a job request to a specified resource. This will cause the job to be submitted to Globus. + Request Line: GRAM_JOB_REQUEST * reqid = non-zero integer Request ID * resource_contact_string = valid url-style Resource Manager Contact string representing a Gatekeeper; see http://www.globus.org/gram/client/ resource_manager_contact.html * callback_contact = a string with a URL obtained from a GRAM_CALLBACK_ALLOW command which will receive messages about the job, or "NULL" (no quotes). * use_full_delegation = an integer; 0 for limited delegation, and 1 for full delegation of the credential sent to the remote resource. * rsl = valid RSL string describing the job; see URL http://www.globus.org/gram/rsl_spec1.html + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 on success, or an error code * job_contact = on success, a string representing a unique identifier for the job. This identifier must not be bound to this GAHP server, but instead must be allowed to be used in subsequent GAHP server instantiations. For instance, the job_contact must be implemented in such a fashion that the following sequence of events by the caller must be permissible: a) issue a GRAM_JOB_REQUEST command b) read the job_contact in the result line c) store the job_contact persistently d) subsequently kill and restart the GAHP server process e) issue a GRAM_JOB_CANCEL command, passing it the stored job_contact value obtained in step (b). It is strongly suggested to GAHP server implementers use the Job Contact string as returned by the Gatekeeper, i.e. a unique contact string (URL) to a Globus Job Manager. ----------------------------------------------- GRAM_JOB_CANCEL This function removes a PENDING job request, or kill all processes associated with an ACTIVE job, releasing any associated resources. + Request Line: GRAM_JOB_CANCEL * reqid = non-zero integer Request ID * job_contact = job_contact (as returned from GRAM_JOB_REQUEST) of the job to be canceled. + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 on success, or an error code ----------------------------------------------- GRAM_JOB_STATUS Query and report the current status of a submitted job. + Request Line: GRAM_JOB_STATUS * reqid = non-zero integer Request ID * job_contact = job_contact (as returned from GRAM_JOB_REQUEST) of the job whose status is desired. + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 on success, or an error code * failure-code = an integer containing additional information about a failure. * job_status = if the result_code is 0 (success), then job_status is set to an integer based upon the status of the job as follows: PENDING 1 ACTIVE 2 FAILED 4 DONE 8 SUSPENDED 16 ----------------------------------------------- GRAM_JOB_REFRESH_PROXY Forces the GAHP server to update the remote GRAM job's proxy with its current (local) state. The command takes as an argument the job contact of a previously submitted GRAM job (as returned from GRAM_JOB_REQUEST). + Request Line: GRAM_JOB_REFRESH_PROXY * reqid = non-zero integer Request ID * job_contact = job_contact (as returned from GRAM_JOB_REQUEST) of the job whose status is desired. + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * failure-code = an integer containing additional information about a failure. ----------------------------------------------- GRAM_JOB_SIGNAL Send a signal to the Job Manager associated with a specified job. + Request Line: GRAM_JOB_SIGNAL * reqid = non-zero integer Request ID * job_contact = job_contact (as returned from GRAM_JOB_REQUEST) of the job whose status is desired. * signal = an integer with the signal to send * signal_arg = a string which contains argument(s) for the signal handler + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 on success, or an error code * failure-code = an integer containing additional information about a failure. * job_status = if the result_code is 0 (success), then job_status is set to an integer based upon the status of the job as follows: PENDING 1 ACTIVE 2 FAILED 4 DONE 8 SUSPENDED 16 ----------------------------------------------- REFRESH_PROXY_FROM_FILE Reset the GSI (Grid Security Infrastructure) proxy certificate cached by the GAHP server, which is used by the GAHP server for all subsequent authentication which requires GSI credentials. This command can be used to tell the GAHP server to use a different credential than the one initially specified via the INITIALIZE_FROM_FILE command. The intention is this command will be used to refresh an about-to-expire credential used by the GAHP server. + Request Line: REFRESH_PROXY_FROM_FILE = a fully-qualified pathname to a file local to the GAHP server which contains a valid GSI proxied certificate. + Return Line: One of the following: S F Upon success, use the "S" version; if not recognized, use the "F" version. * error_string = brief string description of the error, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- CACHE_PROXY_FROM_FILE Read a GSI proxy from a specified file, and store it under the specified symbolic name. The proxy is read from the file by the specified name. Its contents of the proxy are persisted in memory. Subsequent changes to the file will not affect the stored proxy. The proxy is not persisted when the GAHP server ternminates. The intent of this command is to allow the GAHP server to capture several GSI proxies and use different proxies for different jobs. Other commannds (e.g. by USE_CACHED_PROXY) may later be reference the given cached proxy by its symbolic name + Request Line: CACHE_PROXY_FROM_FILE = a symbolic name which will be used to reference the given proxy. = a fully-qualified pathname to a file local to the GAHP server which contains a valid GSI proxied certificate. + Return Line: One of the following: S F Upon success, use the "S" version; if not recognized, use the "F" version. * error_string = brief string description of the error, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- USE_CACHED_PROXY Sets the proxy previously cached under the specified name, as the "active" proxy. The active proxy will be used for all subsequent actions that require authentication. It will remain active until it is changed via the next invocation of USE_CACHED_PROXY. The proxy must have been previously cached (under the specified name) using CACHE_PROXY_FROM_FILE command. This command allows the GAHP server to simultaneously act on behalf of two or more jobs that require + Request Line: USE_CACHED_PROXY = the symbolic name of the proxy to use + Return Line: One of the following: S F Upon success, use the "S" version; if not recognized, use the "F" version. * error_string = brief string description of the error, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- UNCACHE_PROXY Removes the proxy (by the specified symbolic name) from the list of proxies cached by the GAHP server. The proxy must have been previously cached (under the specified name) using CACHE_PROXY_FROM_FILE command. + Request Line: UNCACHE_PROXY = the symbolic name of the proxy to remove + Return Line: One of the following: S F Upon success, use the "S" version; if not recognized, use the "F" version. * error_string = brief string description of the error, appropriate for reporting to a human end-user. + Result Line: None. ----------------------------------------------- GRAM_PING Send a ping to a specified Globus Gatekeeper in order to determine if that Gatekeeper is alive, reachable, authorizes the client's credentials, and is responding to queries. + Request Line: GRAM_PING * reqid = non-zero integer Request ID * resource_contact = valid url-style Resource Manager Contact string representing a Gatekeeper; see http://www.globus.org/gram/client/ resource_manager_contact.html + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 if the Gatekeeper can be successfully contacted and is responding, or an error code. ----------------------------------------------- GRAM_JOB_CALLBACK_REGISTER Register the callback_contact with the job manager for job state changes. + Request Line: GRAM_JOB_CALLBACK_REGISTER * reqid = non-zero integer Request ID * job_contact = job_contact (as returned from GRAM_JOB_REQUEST) of the job whose status is desired. * callback_contact = a string with a URL obtained from a GRAM_CALLBACK_ALLOW command which will receive messages about the job, or "NULL" (no quotes). + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 on success, or an error code * failure-code = an integer containing additional information about a failure. * job_status = if the result_code is 0 (success), then job_status is set to an integer based upon the status of the job as follows: PENDING 1 ACTIVE 2 FAILED 4 DONE 8 SUSPENDED 16 ----------------------------------------------- GASS_SERVER_INIT Create a new listen socket, and dispatch a thread to service incoming GASS file transfer protocol requests on this socket. + Request Line: GASS_SERVER_INIT = a fully-qualified pathname to a file local to the GAHP server which contains a valid GSI proxied certificate. + Return Line: * result = the character "S" (no quotes) for successful submission of the request (meaning that the request is now pending), or an "E" for error on the parse of the request or its arguments (e.g. an unrecognized or unsupported command, or for missing or malformed arguments). + Result Line: * reqid = integer Request ID, set to the value specified in the corresponding Request Line. * result-code = integer equal to 0 on success, or an error code * gass_url = a string containing the base URL where the gass server is listening if result code is 0.