Class: Swift::DB::Postgres

Inherits:
Object
  • Object
show all
Defined in:
ext/swift/db/postgres/adapter.c

Defined Under Namespace

Classes: Result, Statement

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Object 



63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
 
# File 'ext/swift/db/postgres/adapter.c', line 63

VALUE db_postgres_adapter_initialize(VALUE self, VALUE options) {
    char *connection_info;
    VALUE db, user, pass, host, port, ssl;
    Adapter *a = db_postgres_adapter_handle(self);

    if (TYPE(options) != T_HASH)
        rb_raise(eSwiftArgumentError, "options needs to be a hash");

    db   = rb_hash_aref(options, ID2SYM(rb_intern("db")));
    user = rb_hash_aref(options, ID2SYM(rb_intern("user")));
    pass = rb_hash_aref(options, ID2SYM(rb_intern("password")));
    host = rb_hash_aref(options, ID2SYM(rb_intern("host")));
    port = rb_hash_aref(options, ID2SYM(rb_intern("port")));
    ssl  = rb_hash_aref(options, ID2SYM(rb_intern("ssl")));

    if (NIL_P(db))
        rb_raise(eSwiftConnectionError, "Invalid db name");
    if (NIL_P(host))
        host = rb_str_new2("127.0.0.1");
    if (NIL_P(port))
        port = rb_str_new2("5432");
    if (NIL_P(user))
        user = sUser;

    if (!NIL_P(ssl) && TYPE(ssl) != T_HASH)
            rb_raise(eSwiftArgumentError, "ssl options needs to be a hash");

    connection_info = (char *)malloc(4096);
    snprintf(connection_info, 4096, "dbname='%s' user='%s' password='%s' host='%s' port='%s'",
        CSTRING(db), CSTRING(user), CSTRING(pass), CSTRING(host), CSTRING(port));

    if (!NIL_P(ssl)) {
        append_ssl_option(connection_info, 4096, ssl, "sslmode",      "allow");
        append_ssl_option(connection_info, 4096, ssl, "sslcert",      0);
        append_ssl_option(connection_info, 4096, ssl, "sslkey",       0);
        append_ssl_option(connection_info, 4096, ssl, "sslrootcert",  0);
        append_ssl_option(connection_info, 4096, ssl, "sslcrl",       0);
    }

    a->connection = PQconnectdb(connection_info);
    free(connection_info);

    if (!a->connection)
        rb_raise(eSwiftRuntimeError, "unable to allocate database handle");
    if (PQstatus(a->connection) == CONNECTION_BAD)
        rb_raise(eSwiftConnectionError, PQerrorMessage(a->connection));

    PQsetNoticeProcessor(a->connection, (PQnoticeProcessor)db_postgres_adapter_notice, (void*)self);
    PQsetClientEncoding(a->connection, "utf8");
    return self;
}

Instance Method Details

#begin(*args) ⇒ Object 



193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
 
# File 'ext/swift/db/postgres/adapter.c', line 193

VALUE db_postgres_adapter_begin(int argc, VALUE *argv, VALUE self) {
    char command[256];
    VALUE savepoint;
    PGresult *result;

    Adapter *a = db_postgres_adapter_handle_safe(self);
    rb_scan_args(argc, argv, "01", &savepoint);

    if (a->t_nesting == 0) {
        result = PQexec(a->connection, "begin");
        db_postgres_check_result(result);
        PQclear(result);
        a->t_nesting++;
        if (NIL_P(savepoint))
            return Qtrue;
    }

    if (NIL_P(savepoint))
        savepoint = rb_uuid_string();

    snprintf(command, 256, "savepoint %s", CSTRING(savepoint));
    result = PQexec(a->connection, command);
    db_postgres_check_result(result);
    PQclear(result);

    a->t_nesting++;
    return savepoint;
}

#close ⇒ Object 



317
318
319
320
321
322
323
324
325
 
# File 'ext/swift/db/postgres/adapter.c', line 317

VALUE db_postgres_adapter_close(VALUE self) {
    Adapter *a = db_postgres_adapter_handle(self);
    if (a->connection) {
        PQfinish(a->connection);
        a->connection = 0;
        return Qtrue;
    }
    return Qfalse;
}

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


327
328
329
330
 
# File 'ext/swift/db/postgres/adapter.c', line 327

VALUE db_postgres_adapter_closed_q(VALUE self) {
    Adapter *a = db_postgres_adapter_handle(self);
    return a->connection ? Qfalse : Qtrue;
}

#commit(*args) ⇒ Object 



222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
 
# File 'ext/swift/db/postgres/adapter.c', line 222

VALUE db_postgres_adapter_commit(int argc, VALUE *argv, VALUE self) {
    VALUE savepoint;
    char command[256];
    PGresult *result;

    Adapter *a = db_postgres_adapter_handle_safe(self);
    rb_scan_args(argc, argv, "01", &savepoint);

    if (a->t_nesting == 0)
        return Qfalse;

    if (NIL_P(savepoint)) {
        result = PQexec(a->connection, "commit");
        db_postgres_check_result(result);
        PQclear(result);
        a->t_nesting--;
    }
    else {
        snprintf(command, 256, "release savepoint %s", CSTRING(savepoint));
        result = PQexec(a->connection, command);
        db_postgres_check_result(result);
        PQclear(result);
        a->t_nesting--;
    }
    return Qtrue;
}

#escape(fragment) ⇒ Object 



341
342
343
344
345
346
347
348
349
350
351
352
 
# File 'ext/swift/db/postgres/adapter.c', line 341

VALUE db_postgres_adapter_escape(VALUE self, VALUE fragment) {
    int error;
    VALUE text = TO_S(fragment);
    char pg_escaped[RSTRING_LEN(text) * 2 + 1];
    Adapter *a = db_postgres_adapter_handle_safe(self);
    PQescapeStringConn(a->connection, pg_escaped, RSTRING_PTR(text), RSTRING_LEN(text), &error);

    if (error)
        rb_raise(eSwiftArgumentError, "invalid escape string: %s\n", PQerrorMessage(a->connection));

    return rb_str_new2(pg_escaped);
}

#execute(*args) ⇒ Object 



126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
 
# File 'ext/swift/db/postgres/adapter.c', line 126

VALUE db_postgres_adapter_execute(int argc, VALUE *argv, VALUE self) {
    char **bind_args_data = 0;
    int n, *bind_args_size = 0, *bind_args_fmt = 0;
    PGresult *result;
    VALUE sql, bind, data, typecast_bind;
    Adapter *a = db_postgres_adapter_handle_safe(self);

    rb_scan_args(argc, argv, "10*", &sql, &bind);
    if (!a->native)
        sql = db_postgres_normalized_sql(sql);

    typecast_bind = rb_ary_new();
    rb_gc_register_address(&typecast_bind);
    rb_gc_register_address(&sql);
    rb_gc_register_address(&bind);

    if (RARRAY_LEN(bind) > 0) {
        bind_args_size = (int   *) malloc(sizeof(int)    * RARRAY_LEN(bind));
        bind_args_fmt  = (int   *) malloc(sizeof(int)    * RARRAY_LEN(bind));
        bind_args_data = (char **) malloc(sizeof(char *) * RARRAY_LEN(bind));

        for (n = 0; n < RARRAY_LEN(bind); n++) {
            data = rb_ary_entry(bind, n);
            if (NIL_P(data)) {
                bind_args_size[n] = 0;
                bind_args_data[n] = 0;
                bind_args_fmt[n]  = 0;
            }
            else {
                if (rb_obj_is_kind_of(data, rb_cIO) || rb_obj_is_kind_of(data, cStringIO))
                    bind_args_fmt[n] = 1;
                else
                    bind_args_fmt[n] = 0;

                data = typecast_to_string(data);
                rb_ary_push(typecast_bind, data);
                bind_args_size[n] = RSTRING_LEN(data);
                bind_args_data[n] = RSTRING_PTR(data);
            }
        }

        Query q = {
            .connection = a->connection,
            .command    = CSTRING(sql),
            .n_args     = RARRAY_LEN(bind),
            .data       = bind_args_data,
            .size       = bind_args_size,
            .format     = bind_args_fmt
        };

        result = (PGresult *)GVL_NOLOCK(nogvl_pq_exec_params, &q, RUBY_UBF_IO, 0);
        free(bind_args_size);
        free(bind_args_data);
        free(bind_args_fmt);
    }
    else {
        Query q = {.connection = a->connection, .command = CSTRING(sql)};
        result = (PGresult *)GVL_NOLOCK(nogvl_pq_exec, &q, RUBY_UBF_IO, 0);
    }

    rb_gc_unregister_address(&typecast_bind);
    rb_gc_unregister_address(&sql);
    rb_gc_unregister_address(&bind);
    db_postgres_check_result(result);
    return db_postgres_result_load(db_postgres_result_allocate(cDPR), result);
}

#fileno ⇒ Object 



354
355
356
357
 
# File 'ext/swift/db/postgres/adapter.c', line 354

VALUE db_postgres_adapter_fileno(VALUE self) {
    Adapter *a = db_postgres_adapter_handle_safe(self);
    return INT2NUM(PQsocket(a->connection));
}

#native_bind_format ⇒ Object 



373
374
375
376
377
378
379
380
381
382
383
384
385
 
# File 'ext/swift/db/postgres/adapter.c', line 373

VALUE db_postgres_adapter_native(VALUE self) {
    int status, native;
    VALUE result;
    Adapter *a = db_postgres_adapter_handle_safe(self);

    native    = a->native;
    a->native = 1;
    result    = rb_protect(rb_yield, Qnil, &status);
    a->native = native;
    if (status)
        rb_jump_tag(status);
    return result;
}

#native_bind_format=(flag) ⇒ Object 



387
388
389
390
391
 
# File 'ext/swift/db/postgres/adapter.c', line 387

VALUE db_postgres_adapter_native_set(VALUE self, VALUE flag) {
    Adapter *a = db_postgres_adapter_handle_safe(self);
    a->native = Qtrue == flag ? 1 : 0;
    return flag;
}

#ping ⇒ Object 



332
333
334
335
 
# File 'ext/swift/db/postgres/adapter.c', line 332

VALUE db_postgres_adapter_ping(VALUE self) {
    Adapter *a = db_postgres_adapter_handle(self);
    return a->connection && PQstatus(a->connection) == CONNECTION_OK ? Qtrue : Qfalse;
}

#prepare(sql) ⇒ Object 



337
338
339
 
# File 'ext/swift/db/postgres/adapter.c', line 337

VALUE db_postgres_adapter_prepare(VALUE self, VALUE sql) {
    return db_postgres_statement_initialize(db_postgres_statement_allocate(cDPS), self, sql);
}

#query(*args) ⇒ Object 



393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
 
# File 'ext/swift/db/postgres/adapter.c', line 393

VALUE db_postgres_adapter_query(int argc, VALUE *argv, VALUE self) {
    VALUE sql, bind, data;
    char **bind_args_data = 0;
    int n, ok = 1, *bind_args_size = 0, *bind_args_fmt = 0;
    Adapter *a = db_postgres_adapter_handle_safe(self);

    rb_scan_args(argc, argv, "10*", &sql, &bind);
    if (!a->native)
        sql = db_postgres_normalized_sql(sql);

    if (RARRAY_LEN(bind) > 0) {
        bind_args_size = (int   *) malloc(sizeof(int)    * RARRAY_LEN(bind));
        bind_args_fmt  = (int   *) malloc(sizeof(int)    * RARRAY_LEN(bind));
        bind_args_data = (char **) malloc(sizeof(char *) * RARRAY_LEN(bind));

        rb_gc_register_address(&bind);
        for (n = 0; n < RARRAY_LEN(bind); n++) {
            data = rb_ary_entry(bind, n);
            if (NIL_P(data)) {
                bind_args_size[n] = 0;
                bind_args_data[n] = 0;
                bind_args_fmt[n]  = 0;
            }
            else {
                if (rb_obj_is_kind_of(data, rb_cIO) || rb_obj_is_kind_of(data, cStringIO))
                    bind_args_fmt[n] = 1;
                else
                    bind_args_fmt[n] = 0;

                data = typecast_to_string(data);
                bind_args_size[n] = RSTRING_LEN(data);
                bind_args_data[n] = RSTRING_PTR(data);
            }
        }

        ok = PQsendQueryParams(a->connection, RSTRING_PTR(sql), RARRAY_LEN(bind), 0,
            (const char* const *)bind_args_data, bind_args_size, bind_args_fmt, 0);

        rb_gc_unregister_address(&bind);
        free(bind_args_size);
        free(bind_args_data);
        free(bind_args_fmt);
    }
    else
        ok = PQsendQuery(a->connection, RSTRING_PTR(sql));

    if (!ok)
        rb_raise(eSwiftRuntimeError, "%s", PQerrorMessage(a->connection));

    if (rb_block_given_p()) {
        rb_thread_wait_fd(PQsocket(a->connection));
        return db_postgres_result_each(db_postgres_adapter_result(self));
    }
    else
        return Qtrue;
}

#read(*args) ⇒ Object 



517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
 
# File 'ext/swift/db/postgres/adapter.c', line 517

VALUE db_postgres_adapter_read(int argc, VALUE *argv, VALUE self) {
    int n, done = 0;
    char *sql, *data;
    PGresult *result;
    VALUE table, fields, io;
    Adapter *a = db_postgres_adapter_handle_safe(self);

    if (argc > 3)
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0..3)", argc);

    table = fields = io = Qnil;
    switch (argc) {
        case 0:
            if (!rb_block_given_p())
                rb_raise(eSwiftArgumentError, "#read needs an IO object to write to or a block to call");
            break;
        case 1:
            if (rb_respond_to(argv[0], rb_intern("write")))
                io = argv[0];
            else
                table = argv[0];
            break;
        case 2:
            table = argv[0];
            io    = argv[1];
            if (!rb_respond_to(io, rb_intern("write")))
                rb_raise(eSwiftArgumentError, "#read needs an IO object that responds to #write");
            break;
        case 3:
            table  = argv[0];
            fields = argv[1];
            io     = argv[2];
            if (!rb_respond_to(io, rb_intern("write")))
                rb_raise(eSwiftArgumentError, "#read needs an IO object that responds to #write");
            if (TYPE(fields) != T_ARRAY)
                rb_raise(eSwiftArgumentError, "fields needs to be an array");
            if (RARRAY_LEN(fields) < 1)
                fields = Qnil;
    }


    if (!NIL_P(table)) {
        sql = (char *)malloc(4096);
        if (NIL_P(fields))
            snprintf(sql, 4096, "copy %s to stdout", CSTRING(table));
        else
            snprintf(sql, 4096, "copy %s(%s) to stdout", CSTRING(table), CSTRING(rb_ary_join(fields, rb_str_new2(", "))));

        result = PQexec(a->connection, sql);
        free(sql);

        db_postgres_check_result(result);
        PQclear(result);
    }

    while (!done) {
        switch ((n = PQgetCopyData(a->connection, &data, 0))) {
            case -1: done = 1; break;
            case -2: rb_raise(eSwiftRuntimeError, "%s", PQerrorMessage(a->connection));
            default:
                if (n > 0) {
                    if (NIL_P(io))
                        rb_yield(rb_str_new(data, n));
                    else
                        rb_funcall(io, rb_intern("write"), 1, rb_str_new(data, n));
                    PQfreemem(data);
                }
        }
    }

    result = PQgetResult(a->connection);
    db_postgres_check_result(result);
    if (!result)
        rb_raise(eSwiftRuntimeError, "invalid result at the end of COPY command");
    return db_postgres_result_load(db_postgres_result_allocate(cDPR), result);
}

#result ⇒ Object 



359
360
361
362
363
364
365
366
367
368
369
370
371
 
# File 'ext/swift/db/postgres/adapter.c', line 359

VALUE db_postgres_adapter_result(VALUE self) {
    PGresult *result, *rest;
    Adapter *a = db_postgres_adapter_handle_safe(self);
    while (1) {
        PQconsumeInput(a->connection);
        if (!PQisBusy(a->connection))
            break;
    }
    result = PQgetResult(a->connection);
    while ((rest = PQgetResult(a->connection))) PQclear(rest);
    db_postgres_check_result(result);
    return db_postgres_result_load(db_postgres_result_allocate(cDPR), result);
}

#rollback(*args) ⇒ Object 



249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
 
# File 'ext/swift/db/postgres/adapter.c', line 249

VALUE db_postgres_adapter_rollback(int argc, VALUE *argv, VALUE self) {
    VALUE savepoint;
    char command[256];
    PGresult *result;

    Adapter *a = db_postgres_adapter_handle_safe(self);
    rb_scan_args(argc, argv, "01", &savepoint);

    if (a->t_nesting == 0)
        return Qfalse;

    if (NIL_P(savepoint)) {
        result = PQexec(a->connection, "rollback");
        db_postgres_check_result(result);
        PQclear(result);
        a->t_nesting--;
    }
    else {
        snprintf(command, 256, "rollback to savepoint %s", CSTRING(savepoint));
        result = PQexec(a->connection, command);
        db_postgres_check_result(result);
        PQclear(result);
        a->t_nesting--;
    }
    return Qtrue;
}

#transaction(*args) ⇒ Object 



276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
 
# File 'ext/swift/db/postgres/adapter.c', line 276

VALUE db_postgres_adapter_transaction(int argc, VALUE *argv, VALUE self) {
    int status;
    VALUE savepoint, block, block_result;

    Adapter *a = db_postgres_adapter_handle_safe(self);
    rb_scan_args(argc, argv, "01&", &savepoint, &block);

    if (NIL_P(block))
        rb_raise(eSwiftRuntimeError, "postgres transaction requires a block");

    if (a->t_nesting == 0) {
        db_postgres_adapter_begin(1, &savepoint, self);
        block_result = rb_protect(rb_yield, self, &status);
        if (!status) {
            db_postgres_adapter_commit(1, &savepoint, self);
            if (!NIL_P(savepoint))
                db_postgres_adapter_commit(0, 0, self);
        }
        else {
            db_postgres_adapter_rollback(1, &savepoint, self);
            if (!NIL_P(savepoint))
                db_postgres_adapter_rollback(0, 0, self);
            rb_jump_tag(status);
        }
    }
    else {
        if (NIL_P(savepoint))
            savepoint = rb_uuid_string();
        db_postgres_adapter_begin(1, &savepoint, self);
        block_result = rb_protect(rb_yield, self, &status);
        if (!status)
            db_postgres_adapter_commit(1, &savepoint, self);
        else {
            db_postgres_adapter_rollback(1, &savepoint, self);
            rb_jump_tag(status);
        }
    }

    return block_result;
}

#write(*args) ⇒ Object 



450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
 
# File 'ext/swift/db/postgres/adapter.c', line 450

VALUE db_postgres_adapter_write(int argc, VALUE *argv, VALUE self) {
    char *sql;
    VALUE table, fields, io, data;
    PGresult *result;
    Adapter *a = db_postgres_adapter_handle_safe(self);

    if (argc < 1 || argc > 3)
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..3)", argc);

    table = io = fields = Qnil;
    switch (argc) {
        case 1:
            io = argv[0];
            break;
        case 2:
            table = argv[0];
            io    = argv[1];
            break;
        case 3:
            table  = argv[0];
            fields = argv[1];
            io     = argv[2];

            if (TYPE(fields) != T_ARRAY)
                rb_raise(eSwiftArgumentError, "fields needs to be an array");
            if (RARRAY_LEN(fields) < 1)
                fields = Qnil;
    }

    if (argc > 1) {
        sql = (char *)malloc(4096);
        if (NIL_P(fields))
            snprintf(sql, 4096, "copy %s from stdin", CSTRING(table));
        else
            snprintf(sql, 4096, "copy %s(%s) from stdin", CSTRING(table), CSTRING(rb_ary_join(fields, rb_str_new2(", "))));

        result = PQexec(a->connection, sql);
        free(sql);

        db_postgres_check_result(result);
        PQclear(result);
    }

    if (rb_respond_to(io, rb_intern("read"))) {
        while (!NIL_P((data = rb_funcall(io, rb_intern("read"), 1, INT2NUM(4096))))) {
            data = TO_S(data);
            if (PQputCopyData(a->connection, RSTRING_PTR(data), RSTRING_LEN(data)) != 1)
                rb_raise(eSwiftRuntimeError, "%s", PQerrorMessage(a->connection));
        }
        if (PQputCopyEnd(a->connection, 0) != 1)
            rb_raise(eSwiftRuntimeError, "%s", PQerrorMessage(a->connection));
    }
    else {
        io = TO_S(io);
        if (PQputCopyData(a->connection, RSTRING_PTR(io), RSTRING_LEN(io)) != 1)
            rb_raise(eSwiftRuntimeError, "%s", PQerrorMessage(a->connection));
        if (PQputCopyEnd(a->connection, 0) != 1)
            rb_raise(eSwiftRuntimeError, "%s", PQerrorMessage(a->connection));
    }

    result = PQgetResult(a->connection);
    db_postgres_check_result(result);
    if (!result)
        rb_raise(eSwiftRuntimeError, "invalid result at the end of COPY command");
    return db_postgres_result_load(db_postgres_result_allocate(cDPR), result);
}