NAME

TSDebug - traffic Server Debugging APIs

SYNOPSIS

#include <ts/ts.h>

DESCRIPTION

TSError() is similar to printf except that instead of writing the output to the C standard output, it writes output to the Traffic Server error log.

TSDebug() is the same as TSError() except that it only logs the debug message if the given debug tag is enabled. It writes output to the Traffic Server debug log.

TSIsDebugTagSet() returns non-zero if the given debug tag is enabled.

In debug mode, TSAssert Traffic Server to prints the file name, line number and expression, and then aborts. In release mode, the expression is not removed but the effects of printing an error message and aborting are. TSReleaseAssert prints an error message and aborts in both release and debug mode.

TSDebugSpecific() emits a debug line even if the debug tag is turned off, as long as debug flag is enabled. This can be used in conjunction with TSHttpTxnDebugSet(), TSHttpSsnDebugSet(), TSHttpTxnDebugGet() and TSHttpSsnDebugGet() to enable debugging on specific session and transaction objects.

TSHttpServerStateNameLookup(), TSHttpHookNameLookup() and TSHttpEventNameLookup() converts the respective internal state to a string representation. This can be useful in debugging (TSDebug()), logging and other types notifications.

EXAMPLES

This example uses TSDebugSpecific() to log a message when a specific debugging flag is enabled:

#include <ts/ts.h>
// Produce information about a hook receiving an event
TSDebug(PLUGIN_NAME, "Entering hook=%s, event=%s",


        TSHttpHookNameLookup(hook), TSHttpEventNameLookup(event));
// Emit debug message if "tag" is enabled or the txn debug
// flag is set.
TSDebugSpecifc(TSHttpTxnDebugGet(txn), "tag" ,


        "Hello World from transaction %p", txn);

SEE ALSO

TSAPI(3ts), printf(3)

COPYRIGHT

2022, dev@trafficserver.apache.org