NAME¶

pmSearchSetup, pmSearchSetSlots, pmSearchSetEventLoop, pmSearchSetConfiguration, pmSearchSetMetricRegistry, pmSearchClose - fast, scalable and full-text capable search services

C SYNOPSIS¶

#include <pcp/pmwebapi.h>

int pmSearchSetup(pmSearchModule *module, void *arg);

int pmSearchSetSlots(pmSearchModule *module, void *slots);
int pmSearchSetEventLoop(pmSearchModule *module, void *events);
int pmSearchSetConfiguration(pmSearchModule *module, struct dict *config);
int pmSearchSetMetricRegistry(pmSearchModule *module, struct mmv_registry *registry);

int pmSearchClose(pmSearchModule *module);

cc ... -lpcp_web

DESCRIPTION¶

The pmSearchSetup and related API functions prepare an application for accessing the fast and scalable metric, instance and instance domain, full-text capable, searching functionality of the Performance Co-Pilot (PCP).

This functionality is provided trough asynchronous APIs, which function in event-driven fashion. The interface described here prepare a given search module which associates callback routines with certain asynchronous events that occur as part of servicing search requests.

As a general pattern, all interfaces in these APIs that need to invoke callbacks provided by the calling program will take an opaque (void * pointer) arg parameter. This pointer will be passed through unchanged and is typically used to access a data structure maintaining state within the calling program.

Where asynchronous setup is required by pmSearchSetup its completion will be indicated through use of the on_setup callback, which is part of the passed in pmSearchModule structure. This structure also provides for custom diagnostics handling, through the on_info callback. These are self-explanatory, see <pcp/pmwebapi.h> for exact calling conventions.

The callbacks registered by pmSearchSetup to handle events are as follows:

pmSearchTextResultCallBack on_text_result

Callback is called once for each item of search result that matches a given query passed by pmSearchTextInDom(3), pmSearchTextQuery(3), pmSearchTextSuggest(3).

pmSearchMetricsCallBack on_metrics

Callback is called for results of a call to pmSearchInfo(3).

pmSearchDoneCallBack on_done

On completion of all asynchronous interfaces that return success (zero return code), this callback will be called. It provides a status code indicating overall success (zero) or failure (negative PMAPI code) of the operation.

The helper functions pmSearchSetSlots (key-value server), pmSearchSetEventLoop (libuv), pmSearchSetConfiguration (configuration file) and pmSearchSetMetricRegistry (MMV instrumentation) interfaces provide a mechanism for passing in state for each of the associated subsystems.

Finally, a call to pmSearchClose is used to end services available from a search module previously established through pmSearchSetup.

Within PCP, the pmproxy(1) and pmsearch(1) utilities are the primary users of the interfaces, providing REST API and command line search services respectively.

DIAGNOSTICS¶

Where these functions return a status code, this is always zero on success. On failure a negative PMAPI error code is returned.

SEE ALSO¶

pmproxy(1), pmlogger(1), pmsearch(1), mmv_stats_registry(3), pmSearchInfo(3), pmSearchTextInDom(3), pmSearchTextQuery(3), pmSearchTextSuggest(3), PMAPI(3) and PMWEBAPI(3).