Example script entry points
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Example script entry points

The following example shows entry points written in a shell script.

Online entry point for FileOnOff

The FileOnOff example entry point is simple. When the agent's online entry point is called by the agent, the entry point expects the name of the resource as the first argument, followed by the values of the remaining ArgList attributes.

• For agents that are registered as less than V50, the entry point expects the values of the attributes in the order the attributes have been specified in the ArgList attribute.
• For agents registered as V50 and greater, the entry point expects the ArgList in tuple format: the name of the attribute, the number of elements in the attribute's value, and the value.

  Note   The actual VCS FileOnOff entry points are written in C++, but for this example, shell script is used.

Monitor entry point for FileOnOff

When the agent's monitor entry point is called by the agent, the entry point expects the name of the resource as the first argument, followed by the values of the remaining ArgList attributes.

• For agents that are registered as less than V50, the entry point expects the values of the attributes in the order the attributes have been specified in the ArgList attribute.
• For agents registered as V50 and greater, the entry point expects the ArgList in tuple format: the name of the attribute, the number of elements in the attribute's value, and the value.

If the file exists it returns exit code 110, indicating the resource is online with 100% confidence. If the file does not exist the monitor returns 100, indicating the resource is offline. If the state of the file cannot be determined, the monitor returns 99.

#!/bin/sh

# FileOnOff Monitor script

# Expects Resource Name and Pathname

. $VCS_HOME/bin/ag_i18n_inc.sh

RESNAME=$1

VCSAG_SET_ENVS $RESNAME

#check if second attribute provided

#Exit with unknown and log error if not provided.

if [ -z "$2" ]

then

VCSAG_LOG_MSG "W" "The value for PathName is not specified"\

exit 99

else

if [ -f $2 ]; then exit 110;

# Exit online (110) if file exists

# Exit offline (100) if file does not exist

else exit 100;

fi

fi

Monitor entry point with intentional offline

This script includes the intentional offline functionality for the MyCustomApp agent.

See About on-off, on-only, and persistent resources.

Note that the method to detect intentional offline of an application depends on the type of application. The following example assumes that the application writes a status code into a file if the application is intentionally stopped.

#!/bin/sh

. ${CLUSTER_HOME}/bin/ag_i18n_inc.sh

ResName=$1; shift;

VCSAG_SET_ENVS $ResName

// Obtain the attribute values from ArgListValues

parse_arglist_values();

RETVAL=$?

if [ ${RETVAL} -eq ${VCSAG_RES_UNKNOWN} ]; then

// Could not get all the required attributes from ArgListValues

exit $VCSAG_RES_UNKNOWN;

fi

// Check if the application's process is present in the ps

// output

check_if_app_is_running();

RETVAL=$?

if [ ${REVAL} -eq ${VCSAG_RES_ONLINE} ]; then

// Application process found

exit $VCSAG_RES_ONLINE;

fi

// Application process was not found; Check if user gracefully

// shutdown the application

grep "MyCustomAppCode 123 : User initiated shutdown command" ${APPLICATION_CREATED_STATUS_FILE}

RETVAL=$?

if [ ${REVAL} -eq 0 ]; then

// Found MyCustomAppCode 123 in the application's status

// file that gets created by the application on graceful

//shutdown

exit $VCSAG_RES_INTENTIONALOFFLINE;

else

// Did not find MyCustomAppCode 123; hence application has

// crashed or gone down unintentionally

exit $VCSAG_RES_OFFLINE;

fi

// Monitor should never come here

exit $VCSAG_RES_UNKNOWN;

Offline entry point for FileOnOff

When the agent's offline entry point is called by the agent, the entry point expects the name of the resource as the first argument, followed by the values of the remaining ArgList attributes.

• For agents that are registered as less than V50, the entry point expects the values of the attributes in the order the attributes have been specified in the ArgList attribute.
• For agents registered as V50 and greater, the entry point expects the ArgList in tuple format: the name of the attribute, the number of elements in the attribute's value, and the value.

When the values are accepted by the entry point, the file is deleted.

#!/bin/sh

# FileOnOff Offline script

# Expects ResourceName and Pathname

#

. $VCS_HOME/bin/ag_i18n_inc.sh

RESNAME=$1

VCSAG_SET_ENVS $RESNAME

#check if second attribute provided

if [ -z "$2" ]

then

VCSAG_LOG_MSG "W" "The value for PathName is not specified"\

1020

else

#remove the file

/bin/rm -f $2

fi

exit 0;