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Modify pg_stat_get_activity to build a tuplestore
This updates pg_stat_get_activity() to build a tuplestore for its results instead of using the old-style multiple-call method. This simplifies the function, though that wasn't the primary motivation for the change, which is that we may turn it into a helper function which can filter the results (or not) much more easily.
This commit is contained in:
Stephen Frost
parent
4b342fb591
commit
f91feba877
@ -524,137 +524,75 @@ pg_stat_get_backend_idset(PG_FUNCTION_ARGS)
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}
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}
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/*
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* Returns activity of PG backends.
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*/
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Datum
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pg_stat_get_activity(PG_FUNCTION_ARGS)
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{
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FuncCallContext *funcctx;
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if (SRF_IS_FIRSTCALL())
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{
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MemoryContext oldcontext;
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#define PG_STAT_GET_ACTIVITY_COLS 22
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int num_backends = pgstat_fetch_stat_numbackends();
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int curr_backend;
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int pid = PG_ARGISNULL(0) ? -1 : PG_GETARG_INT32(0);
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ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
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TupleDesc tupdesc;
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Tuplestorestate *tupstore;
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MemoryContext per_query_ctx;
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MemoryContext oldcontext;
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funcctx = SRF_FIRSTCALL_INIT();
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/* check to see if caller supports us returning a tuplestore */
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if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("set-valued function called in context that cannot accept a set")));
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if (!(rsinfo->allowedModes & SFRM_Materialize))
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("materialize mode required, but it is not " \
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"allowed in this context")));
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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tupdesc = CreateTemplateTupleDesc(22, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "datid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "pid",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "usesysid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "application_name",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "state",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 6, "query",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 7, "waiting",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 8, "act_start",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 9, "query_start",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 10, "backend_start",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 11, "state_change",
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TIMESTAMPTZOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 12, "client_addr",
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INETOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 13, "client_hostname",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 14, "client_port",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 15, "backend_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 16, "backend_xmin",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 17, "ssl",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 18, "sslversion",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 19, "sslcipher",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 20, "sslbits",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 21, "sslcompression",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 22, "sslclientdn",
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TEXTOID, -1, 0);
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per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
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oldcontext = MemoryContextSwitchTo(per_query_ctx);
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funcctx->tuple_desc = BlessTupleDesc(tupdesc);
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funcctx->user_fctx = palloc0(sizeof(int));
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if (PG_ARGISNULL(0))
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{
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/* Get all backends */
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funcctx->max_calls = pgstat_fetch_stat_numbackends();
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}
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else
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{
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/*
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* Get one backend - locate by pid.
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*
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* We lookup the backend early, so we can return zero rows if it
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* doesn't exist, instead of returning a single row full of NULLs.
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*/
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int pid = PG_GETARG_INT32(0);
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int i;
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int n = pgstat_fetch_stat_numbackends();
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for (i = 1; i <= n; i++)
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{
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PgBackendStatus *be = pgstat_fetch_stat_beentry(i);
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if (be)
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{
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if (be->st_procpid == pid)
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{
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*(int *) (funcctx->user_fctx) = i;
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break;
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}
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}
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}
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if (*(int *) (funcctx->user_fctx) == 0)
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/* Pid not found, return zero rows */
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funcctx->max_calls = 0;
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else
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funcctx->max_calls = 1;
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}
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tupstore = tuplestore_begin_heap(true, false, work_mem);
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rsinfo->returnMode = SFRM_Materialize;
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rsinfo->setResult = tupstore;
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rsinfo->setDesc = tupdesc;
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MemoryContextSwitchTo(oldcontext);
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}
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/* stuff done on every call of the function */
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funcctx = SRF_PERCALL_SETUP();
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if (funcctx->call_cntr < funcctx->max_calls)
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/* 1-based index */
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for (curr_backend = 1; curr_backend <= num_backends; curr_backend++)
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{
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/* for each row */
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Datum values[22];
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bool nulls[22];
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HeapTuple tuple;
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Datum values[PG_STAT_GET_ACTIVITY_COLS];
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bool nulls[PG_STAT_GET_ACTIVITY_COLS];
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LocalPgBackendStatus *local_beentry;
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PgBackendStatus *beentry;
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MemSet(values, 0, sizeof(values));
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MemSet(nulls, 0, sizeof(nulls));
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if (*(int *) (funcctx->user_fctx) > 0)
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if (pid != -1)
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{
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/* Get specific pid slot */
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local_beentry = pgstat_fetch_stat_local_beentry(*(int *) (funcctx->user_fctx));
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beentry = &local_beentry->backendStatus;
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/* Skip any which are not the one we're looking for. */
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PgBackendStatus *be = pgstat_fetch_stat_beentry(curr_backend);
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if (!be || be->st_procpid != pid)
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continue;
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}
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else
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{
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/* Get the next one in the list */
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local_beentry = pgstat_fetch_stat_local_beentry(funcctx->call_cntr + 1); /* 1-based index */
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local_beentry = pgstat_fetch_stat_local_beentry(curr_backend);
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if (!local_beentry)
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continue;
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beentry = &local_beentry->backendStatus;
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}
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if (!beentry)
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{
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int i;
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@ -665,8 +603,8 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
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nulls[5] = false;
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values[5] = CStringGetTextDatum("<backend information not available>");
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tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
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SRF_RETURN_NEXT(funcctx, HeapTupleGetDatum(tuple));
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tuplestore_putvalues(tupstore, tupdesc, values, nulls);
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continue;
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}
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/* Values available to all callers */
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@ -839,15 +777,17 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
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nulls[13] = true;
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}
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tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
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tuplestore_putvalues(tupstore, tupdesc, values, nulls);
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SRF_RETURN_NEXT(funcctx, HeapTupleGetDatum(tuple));
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}
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else
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{
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/* nothing left */
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SRF_RETURN_DONE(funcctx);
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/* If only a single backend was requested, and we found it, break. */
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if (pid != -1)
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break;
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}
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/* clean up and return the tuplestore */
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tuplestore_donestoring(tupstore);
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return (Datum) 0;
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}
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