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Reimplement create and drop scripts in C, to reduce repetitive
connections, increase robustness, add NLS, and prepare for Windows port. (vacuumdb and clusterdb will follow later.)
This commit is contained in:
Peter Eisentraut
286
src/bin/scripts/createlang.c
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286
src/bin/scripts/createlang.c
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@@ -0,0 +1,286 @@
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/*-------------------------------------------------------------------------
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*
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* createlang
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Header: /cvsroot/pgsql/src/bin/scripts/createlang.c,v 1.1 2003/03/18 22:19:46 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include "common.h"
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#include "print.h"
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static void help(const char *progname);
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int
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main(int argc, char *argv[])
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{
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static struct option long_options[] = {
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{"list", no_argument, NULL, 'l'},
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{"host", required_argument, NULL, 'h'},
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{"port", required_argument, NULL, 'p'},
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{"username", required_argument, NULL, 'U'},
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{"password", no_argument, NULL, 'W'},
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{"dbname", required_argument, NULL, 'd'},
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{"pglib", required_argument, NULL, 'L'},
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{"echo", no_argument, NULL, 'e'},
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{NULL, 0, NULL, 0}
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};
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char *progname;
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int optindex;
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int c;
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bool listlangs = false;
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const char *dbname = NULL;
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char *host = NULL;
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char *port = NULL;
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char *username = NULL;
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bool password = false;
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bool echo = false;
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char *pglib = NULL;
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char *langname = NULL;
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char *p;
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bool handlerexists;
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bool trusted;
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char *handler;
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char *object;
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PQExpBufferData sql;
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PGconn *conn;
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PGresult *result;
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progname = get_progname(argv[0]);
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init_nls();
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handle_help_version_opts(argc, argv, "createlang", help);
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while ((c = getopt_long(argc, argv, "lh:p:U:Wd:L:e", long_options, &optindex)) != -1)
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{
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switch (c)
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{
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case 'l':
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listlangs = true;
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break;
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case 'h':
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host = optarg;
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break;
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case 'p':
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port = optarg;
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break;
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case 'U':
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username = optarg;
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break;
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case 'W':
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password = true;
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break;
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case 'd':
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dbname = optarg;
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break;
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case 'L':
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pglib = optarg;
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break;
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case 'e':
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echo = true;
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break;
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default:
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fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
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exit(1);
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}
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}
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if (argc - optind > 0)
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{
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if (listlangs)
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dbname = argv[optind++];
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else
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{
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langname = argv[optind++];
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if (argc - optind > 0)
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dbname = argv[optind++];
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}
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}
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if (argc - optind > 0)
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{
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fprintf(stderr, _("%s: too many command-line arguments (first is '%s')\n"),
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progname, argv[optind]);
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fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
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exit(1);
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}
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if (dbname == NULL)
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{
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if (getenv("PGDATABASE"))
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dbname = getenv("PGDATABASE");
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else if (getenv("PGUSER"))
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dbname = getenv("PGUSER");
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else
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dbname = get_user_name(progname);
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}
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initPQExpBuffer(&sql);
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/*
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* List option
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*/
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if (listlangs)
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{
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printQueryOpt popt;
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conn = connectDatabase(dbname, host, port, username, password, progname);
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printfPQExpBuffer(&sql, "SELECT lanname as \"%s\", (CASE WHEN lanpltrusted THEN '%s' ELSE '%s' END) as \"%s\" FROM pg_language WHERE lanispl IS TRUE;", _("Name"), _("yes"), _("no"), _("Trusted?"));
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result = executeQuery(conn, sql.data, progname, echo);
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memset(&popt, 0, sizeof(popt));
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popt.topt.format = PRINT_ALIGNED;
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popt.topt.border = 1;
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popt.topt.encoding = PQclientEncoding(conn);
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popt.title = _("Procedural Languages");
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printQuery(result, &popt, stdout);
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PQfinish(conn);
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exit(0);
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}
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if (langname == NULL)
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{
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fprintf(stderr, _("%s: missing required argument language name\n"), progname);
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fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
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exit(1);
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}
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if (!pglib)
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pglib = "$libdir";
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for (p = langname; *p; p++)
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if (*p >= 'A' && *p <= 'Z')
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*p += ('a' - 'A');
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if (strcmp(langname, "plpgsql")==0)
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{
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trusted = true;
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handler = "plpgsql_call_handler";
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object = "plpgsql";
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}
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else if (strcmp(langname, "pltcl")==0)
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{
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trusted = true;
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handler = "pltcl_call_handler";
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object = "pltcl";
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}
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else if (strcmp(langname, "pltclu")==0)
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{
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trusted = false;
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handler = "pltclu_call_handler";
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object = "pltcl";
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}
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else if (strcmp(langname, "plperl")==0)
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{
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trusted = true;
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handler = "plperl_call_handler";
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object = "plperl";
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}
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else if (strcmp(langname, "plperlu")==0)
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{
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trusted = false;
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handler = "plperl_call_handler";
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object = "plperl";
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}
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else if (strcmp(langname, "plpython")==0)
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{
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trusted = true;
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handler = "plpython_call_handler";
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object = "plpython";
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}
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else
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{
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fprintf(stderr, _("%s: unsupported language \"%s\"\n"), progname, langname);
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fprintf(stderr, _("Supported languages are plpgsql, pltcl, pltclu, plperl, plperlu, and plpython.\n"));
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exit(1);
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}
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conn = connectDatabase(dbname, host, port, username, password, progname);
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/*
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* Make sure the language isn't already installed
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*/
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printfPQExpBuffer(&sql, "SELECT oid FROM pg_language WHERE lanname = '%s';", langname);
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result = executeQuery(conn, sql.data, progname, echo);
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if (PQntuples(result) > 0)
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{
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PQfinish(conn);
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fprintf(stderr,
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_("%s: language \"%s\" is already installed in database \"%s\"\n"),
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progname, langname, dbname);
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/* separate exit status for "already installed" */
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exit(2);
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}
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PQclear(result);
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/*
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* Check whether the call handler exists
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*/
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printfPQExpBuffer(&sql, "SELECT oid FROM pg_proc WHERE proname = '%s' AND prorettype = (SELECT oid FROM pg_type WHERE typname = 'language_handler') AND pronargs = 0;", handler);
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result = executeQuery(conn, sql.data, progname, echo);
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handlerexists = (PQntuples(result) > 0);
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PQclear(result);
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/*
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* Create the call handler and the language
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*/
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printfPQExpBuffer(&sql, "SET autocommit TO on;\n");
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if (!handlerexists)
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appendPQExpBuffer(&sql,
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"CREATE FUNCTION \"%s\" () RETURNS language_handler AS '%s/%s' LANGUAGE C;\n",
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handler, pglib, object);
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appendPQExpBuffer(&sql,
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"CREATE %sLANGUAGE \"%s\" HANDLER \"%s\";\n",
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(trusted ? "TRUSTED " : ""), langname, handler);
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if (echo)
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printf("%s", sql.data);
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result = PQexec(conn, sql.data);
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if (PQresultStatus(result) != PGRES_COMMAND_OK)
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{
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fprintf(stderr, _("%s: language installation failed: %s"),
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progname, PQerrorMessage(conn));
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PQfinish(conn);
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exit(1);
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}
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PQfinish(conn);
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exit(0);
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}
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static void
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help(const char *progname)
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{
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printf(_("%s installs a procedural language into a PostgreSQL database.\n\n"), progname);
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printf(_("Usage:\n"));
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printf(_(" %s [OPTION]... LANGNAME [DBNAME]\n"), progname);
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printf(_("\nOptions:\n"));
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printf(_(" -d, --dbname=DBNAME database to install language in\n"));
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printf(_(" -e, --echo show the commands being sent to the server\n"));
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printf(_(" -l, --list show a list of currently installed languages\n"));
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printf(_(" -L, --pglib=DIRECTORY find language interpreter file in DIRECTORY\n"));
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printf(_(" -h, --host=HOSTNAME database server host\n"));
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printf(_(" -p, --port=PORT database server port\n"));
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printf(_(" -U, --username=USERNAME user name to connect as\n"));
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printf(_(" -W, --password prompt for password\n"));
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printf(_(" --help show this help, then exit\n"));
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printf(_(" --version output version information, then exit\n"));
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printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
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}
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