TSDebug

Traffic Server Debugging APIs.

Synopsis

#include <ts/ts.h>

void TSStatus(const char *format, ...)

void TSNote(const char *format, ...)

void TSWarning(const char *format, ...)

void TSError(const char *format, ...)

void TSFatal(const char *format, ...)

void TSAlert(const char *format, ...)

void TSEmergency(const char *format, ...)

void TSDebug(const char *tag, const char *format, ...)

int TSIsDebugTagSet(const char *tag)

void TSDebugSpecific(int debug_flag, const char *tag, const char *format, ...)

void TSHttpTxnDebugSet(TSHttpTxn txnp, int on)

void TSHttpSsnDebugSet(TSHttpSsn ssn, int on)

int TSHttpTxnDebugGet(TSHttpTxn txnp)

int TSHttpSsnDebugGet(TSHttpSsn ssn)

const char *TSHttpServerStateNameLookup(TSServerState state)

const char *TSHttpHookNameLookup(TSHttpHookID hook)

const char *TSHttpEventNameLookup(TSEvent event)

TSAssert(...)

TSReleaseAssert(...)

diags.log

The following methods print to diags.log with expected reactions as a coordinated outcome of Traffic Server, Traffic Manager, AuTest, CI, and your log monitoring service/dashboard (e.g. Splunk)

API	Purpose	TrafficManager	AuTest+CI	LogMonitor
TSStatus()	basic information
TSNote()	significant information
TSWarning()	concerning information			track
TSError()	operational failure		FAIL	review
TSFatal()	recoverable crash	restart	FAIL	review
TSAlert()	significant crash	restart	FAIL	ALERT
TSEmergency()	unrecoverable,misconfigured	EXIT	FAIL	ALERT

Note

TSFatal(), TSAlert(), and TSEmergency() can be called within TSPluginInit(), such that Traffic Server can be shutdown promptly when the plugin fails to initialize properly.

trafficserver.out

TSDebug() logs the debug message only if the given debug tag is enabled. It writes output to the Traffic Server debug log through stderr.

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)