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These hooks can be used in loadable modules. A simple test module is included. Discussion: https://postgr.es/m/20170720204733.40f2b7eb.nagata@sraoss.co.jp Fabrízio de Royes Mello and Yugo Nagata Reviewed by Michael Paquier and Aleksandr Parfenov
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
/* -------------------------------------------------------------------------
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*
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* test_session_hooks.c
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* Code for testing SESSION hooks.
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*
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* Copyright (c) 2010-2017, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/test/modules/test_session_hooks/test_session_hooks.c
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*
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* -------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/xact.h"
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#include "commands/dbcommands.h"
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#include "executor/spi.h"
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#include "lib/stringinfo.h"
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#include "miscadmin.h"
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#include "tcop/tcopprot.h"
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#include "utils/snapmgr.h"
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#include "utils/builtins.h"
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PG_MODULE_MAGIC;
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/* Entry point of library loading/unloading */
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void _PG_init(void);
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void _PG_fini(void);
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/* GUC variables */
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static char *session_hook_username = "postgres";
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/* Original Hook */
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static session_start_hook_type prev_session_start_hook = NULL;
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static session_end_hook_type prev_session_end_hook = NULL;
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static void
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register_session_hook(const char *hook_at)
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{
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const char *username;
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StartTransactionCommand();
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SPI_connect();
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PushActiveSnapshot(GetTransactionSnapshot());
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username = GetUserNameFromId(GetUserId(), false);
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/* Register log just for configured username */
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if (!strcmp(username, session_hook_username))
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{
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const char *dbname;
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int ret;
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StringInfoData buf;
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dbname = get_database_name(MyDatabaseId);
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initStringInfo(&buf);
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appendStringInfo(&buf, "INSERT INTO session_hook_log (dbname, username, hook_at) ");
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appendStringInfo(&buf, "VALUES ('%s', '%s', '%s');",
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dbname, username, hook_at);
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ret = SPI_exec(buf.data, 0);
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if (ret != SPI_OK_INSERT)
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elog(ERROR, "SPI_execute failed: error code %d", ret);
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}
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SPI_finish();
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PopActiveSnapshot();
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CommitTransactionCommand();
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}
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/* sample session start hook function */
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static void
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sample_session_start_hook()
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{
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/* Hook just normal backends */
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if (MyBackendId != InvalidBackendId)
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{
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(void) register_session_hook("START");
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if (prev_session_start_hook)
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prev_session_start_hook();
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}
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}
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/* sample session end hook function */
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static void
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sample_session_end_hook()
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{
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/* Hook just normal backends */
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if (MyBackendId != InvalidBackendId)
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{
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if (prev_session_end_hook)
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prev_session_end_hook();
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(void) register_session_hook("END");
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}
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}
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/*
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* Module Load Callback
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*/
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void
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_PG_init(void)
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{
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/* Save Hooks for Unload */
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prev_session_start_hook = session_start_hook;
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prev_session_end_hook = session_end_hook;
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/* Set New Hooks */
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session_start_hook = sample_session_start_hook;
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session_end_hook = sample_session_end_hook;
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/* Load GUCs */
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DefineCustomStringVariable("test_session_hooks.username",
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"Username to register log on session start or end",
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NULL,
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&session_hook_username,
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"postgres",
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PGC_SIGHUP,
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0, NULL, NULL, NULL);
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}
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/*
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* Module Unload Callback
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*/
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void
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_PG_fini(void)
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{
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/* Uninstall Hooks */
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session_start_hook = prev_session_start_hook;
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session_end_hook = prev_session_end_hook;
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}
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