Colin Cross | 7bb052a | 2015-02-03 12:59:37 -0800 | [diff] [blame^] | 1 | // Copyright 2011 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package sql |
| 6 | |
| 7 | import ( |
| 8 | "database/sql/driver" |
| 9 | "errors" |
| 10 | "fmt" |
| 11 | "io" |
| 12 | "log" |
| 13 | "sort" |
| 14 | "strconv" |
| 15 | "strings" |
| 16 | "sync" |
| 17 | "testing" |
| 18 | "time" |
| 19 | ) |
| 20 | |
| 21 | var _ = log.Printf |
| 22 | |
| 23 | // fakeDriver is a fake database that implements Go's driver.Driver |
| 24 | // interface, just for testing. |
| 25 | // |
| 26 | // It speaks a query language that's semantically similar to but |
| 27 | // syntactically different and simpler than SQL. The syntax is as |
| 28 | // follows: |
| 29 | // |
| 30 | // WIPE |
| 31 | // CREATE|<tablename>|<col>=<type>,<col>=<type>,... |
| 32 | // where types are: "string", [u]int{8,16,32,64}, "bool" |
| 33 | // INSERT|<tablename>|col=val,col2=val2,col3=? |
| 34 | // SELECT|<tablename>|projectcol1,projectcol2|filtercol=?,filtercol2=? |
| 35 | // |
| 36 | // When opening a fakeDriver's database, it starts empty with no |
| 37 | // tables. All tables and data are stored in memory only. |
| 38 | type fakeDriver struct { |
| 39 | mu sync.Mutex // guards 3 following fields |
| 40 | openCount int // conn opens |
| 41 | closeCount int // conn closes |
| 42 | waitCh chan struct{} |
| 43 | waitingCh chan struct{} |
| 44 | dbs map[string]*fakeDB |
| 45 | } |
| 46 | |
| 47 | type fakeDB struct { |
| 48 | name string |
| 49 | |
| 50 | mu sync.Mutex |
| 51 | free []*fakeConn |
| 52 | tables map[string]*table |
| 53 | badConn bool |
| 54 | } |
| 55 | |
| 56 | type table struct { |
| 57 | mu sync.Mutex |
| 58 | colname []string |
| 59 | coltype []string |
| 60 | rows []*row |
| 61 | } |
| 62 | |
| 63 | func (t *table) columnIndex(name string) int { |
| 64 | for n, nname := range t.colname { |
| 65 | if name == nname { |
| 66 | return n |
| 67 | } |
| 68 | } |
| 69 | return -1 |
| 70 | } |
| 71 | |
| 72 | type row struct { |
| 73 | cols []interface{} // must be same size as its table colname + coltype |
| 74 | } |
| 75 | |
| 76 | func (r *row) clone() *row { |
| 77 | nrow := &row{cols: make([]interface{}, len(r.cols))} |
| 78 | copy(nrow.cols, r.cols) |
| 79 | return nrow |
| 80 | } |
| 81 | |
| 82 | type fakeConn struct { |
| 83 | db *fakeDB // where to return ourselves to |
| 84 | |
| 85 | currTx *fakeTx |
| 86 | |
| 87 | // Stats for tests: |
| 88 | mu sync.Mutex |
| 89 | stmtsMade int |
| 90 | stmtsClosed int |
| 91 | numPrepare int |
| 92 | bad bool |
| 93 | } |
| 94 | |
| 95 | func (c *fakeConn) incrStat(v *int) { |
| 96 | c.mu.Lock() |
| 97 | *v++ |
| 98 | c.mu.Unlock() |
| 99 | } |
| 100 | |
| 101 | type fakeTx struct { |
| 102 | c *fakeConn |
| 103 | } |
| 104 | |
| 105 | type fakeStmt struct { |
| 106 | c *fakeConn |
| 107 | q string // just for debugging |
| 108 | |
| 109 | cmd string |
| 110 | table string |
| 111 | |
| 112 | closed bool |
| 113 | |
| 114 | colName []string // used by CREATE, INSERT, SELECT (selected columns) |
| 115 | colType []string // used by CREATE |
| 116 | colValue []interface{} // used by INSERT (mix of strings and "?" for bound params) |
| 117 | placeholders int // used by INSERT/SELECT: number of ? params |
| 118 | |
| 119 | whereCol []string // used by SELECT (all placeholders) |
| 120 | |
| 121 | placeholderConverter []driver.ValueConverter // used by INSERT |
| 122 | } |
| 123 | |
| 124 | var fdriver driver.Driver = &fakeDriver{} |
| 125 | |
| 126 | func init() { |
| 127 | Register("test", fdriver) |
| 128 | } |
| 129 | |
| 130 | func contains(list []string, y string) bool { |
| 131 | for _, x := range list { |
| 132 | if x == y { |
| 133 | return true |
| 134 | } |
| 135 | } |
| 136 | return false |
| 137 | } |
| 138 | |
| 139 | type Dummy struct { |
| 140 | driver.Driver |
| 141 | } |
| 142 | |
| 143 | func TestDrivers(t *testing.T) { |
| 144 | unregisterAllDrivers() |
| 145 | Register("test", fdriver) |
| 146 | Register("invalid", Dummy{}) |
| 147 | all := Drivers() |
| 148 | if len(all) < 2 || !sort.StringsAreSorted(all) || !contains(all, "test") || !contains(all, "invalid") { |
| 149 | t.Fatalf("Drivers = %v, want sorted list with at least [invalid, test]", all) |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | // Supports dsn forms: |
| 154 | // <dbname> |
| 155 | // <dbname>;<opts> (only currently supported option is `badConn`, |
| 156 | // which causes driver.ErrBadConn to be returned on |
| 157 | // every other conn.Begin()) |
| 158 | func (d *fakeDriver) Open(dsn string) (driver.Conn, error) { |
| 159 | parts := strings.Split(dsn, ";") |
| 160 | if len(parts) < 1 { |
| 161 | return nil, errors.New("fakedb: no database name") |
| 162 | } |
| 163 | name := parts[0] |
| 164 | |
| 165 | db := d.getDB(name) |
| 166 | |
| 167 | d.mu.Lock() |
| 168 | d.openCount++ |
| 169 | d.mu.Unlock() |
| 170 | conn := &fakeConn{db: db} |
| 171 | |
| 172 | if len(parts) >= 2 && parts[1] == "badConn" { |
| 173 | conn.bad = true |
| 174 | } |
| 175 | if d.waitCh != nil { |
| 176 | d.waitingCh <- struct{}{} |
| 177 | <-d.waitCh |
| 178 | d.waitCh = nil |
| 179 | d.waitingCh = nil |
| 180 | } |
| 181 | return conn, nil |
| 182 | } |
| 183 | |
| 184 | func (d *fakeDriver) getDB(name string) *fakeDB { |
| 185 | d.mu.Lock() |
| 186 | defer d.mu.Unlock() |
| 187 | if d.dbs == nil { |
| 188 | d.dbs = make(map[string]*fakeDB) |
| 189 | } |
| 190 | db, ok := d.dbs[name] |
| 191 | if !ok { |
| 192 | db = &fakeDB{name: name} |
| 193 | d.dbs[name] = db |
| 194 | } |
| 195 | return db |
| 196 | } |
| 197 | |
| 198 | func (db *fakeDB) wipe() { |
| 199 | db.mu.Lock() |
| 200 | defer db.mu.Unlock() |
| 201 | db.tables = nil |
| 202 | } |
| 203 | |
| 204 | func (db *fakeDB) createTable(name string, columnNames, columnTypes []string) error { |
| 205 | db.mu.Lock() |
| 206 | defer db.mu.Unlock() |
| 207 | if db.tables == nil { |
| 208 | db.tables = make(map[string]*table) |
| 209 | } |
| 210 | if _, exist := db.tables[name]; exist { |
| 211 | return fmt.Errorf("table %q already exists", name) |
| 212 | } |
| 213 | if len(columnNames) != len(columnTypes) { |
| 214 | return fmt.Errorf("create table of %q len(names) != len(types): %d vs %d", |
| 215 | name, len(columnNames), len(columnTypes)) |
| 216 | } |
| 217 | db.tables[name] = &table{colname: columnNames, coltype: columnTypes} |
| 218 | return nil |
| 219 | } |
| 220 | |
| 221 | // must be called with db.mu lock held |
| 222 | func (db *fakeDB) table(table string) (*table, bool) { |
| 223 | if db.tables == nil { |
| 224 | return nil, false |
| 225 | } |
| 226 | t, ok := db.tables[table] |
| 227 | return t, ok |
| 228 | } |
| 229 | |
| 230 | func (db *fakeDB) columnType(table, column string) (typ string, ok bool) { |
| 231 | db.mu.Lock() |
| 232 | defer db.mu.Unlock() |
| 233 | t, ok := db.table(table) |
| 234 | if !ok { |
| 235 | return |
| 236 | } |
| 237 | for n, cname := range t.colname { |
| 238 | if cname == column { |
| 239 | return t.coltype[n], true |
| 240 | } |
| 241 | } |
| 242 | return "", false |
| 243 | } |
| 244 | |
| 245 | func (c *fakeConn) isBad() bool { |
| 246 | // if not simulating bad conn, do nothing |
| 247 | if !c.bad { |
| 248 | return false |
| 249 | } |
| 250 | // alternate between bad conn and not bad conn |
| 251 | c.db.badConn = !c.db.badConn |
| 252 | return c.db.badConn |
| 253 | } |
| 254 | |
| 255 | func (c *fakeConn) Begin() (driver.Tx, error) { |
| 256 | if c.isBad() { |
| 257 | return nil, driver.ErrBadConn |
| 258 | } |
| 259 | if c.currTx != nil { |
| 260 | return nil, errors.New("already in a transaction") |
| 261 | } |
| 262 | c.currTx = &fakeTx{c: c} |
| 263 | return c.currTx, nil |
| 264 | } |
| 265 | |
| 266 | var hookPostCloseConn struct { |
| 267 | sync.Mutex |
| 268 | fn func(*fakeConn, error) |
| 269 | } |
| 270 | |
| 271 | func setHookpostCloseConn(fn func(*fakeConn, error)) { |
| 272 | hookPostCloseConn.Lock() |
| 273 | defer hookPostCloseConn.Unlock() |
| 274 | hookPostCloseConn.fn = fn |
| 275 | } |
| 276 | |
| 277 | var testStrictClose *testing.T |
| 278 | |
| 279 | // setStrictFakeConnClose sets the t to Errorf on when fakeConn.Close |
| 280 | // fails to close. If nil, the check is disabled. |
| 281 | func setStrictFakeConnClose(t *testing.T) { |
| 282 | testStrictClose = t |
| 283 | } |
| 284 | |
| 285 | func (c *fakeConn) Close() (err error) { |
| 286 | drv := fdriver.(*fakeDriver) |
| 287 | defer func() { |
| 288 | if err != nil && testStrictClose != nil { |
| 289 | testStrictClose.Errorf("failed to close a test fakeConn: %v", err) |
| 290 | } |
| 291 | hookPostCloseConn.Lock() |
| 292 | fn := hookPostCloseConn.fn |
| 293 | hookPostCloseConn.Unlock() |
| 294 | if fn != nil { |
| 295 | fn(c, err) |
| 296 | } |
| 297 | if err == nil { |
| 298 | drv.mu.Lock() |
| 299 | drv.closeCount++ |
| 300 | drv.mu.Unlock() |
| 301 | } |
| 302 | }() |
| 303 | if c.currTx != nil { |
| 304 | return errors.New("can't close fakeConn; in a Transaction") |
| 305 | } |
| 306 | if c.db == nil { |
| 307 | return errors.New("can't close fakeConn; already closed") |
| 308 | } |
| 309 | if c.stmtsMade > c.stmtsClosed { |
| 310 | return errors.New("can't close; dangling statement(s)") |
| 311 | } |
| 312 | c.db = nil |
| 313 | return nil |
| 314 | } |
| 315 | |
| 316 | func checkSubsetTypes(args []driver.Value) error { |
| 317 | for n, arg := range args { |
| 318 | switch arg.(type) { |
| 319 | case int64, float64, bool, nil, []byte, string, time.Time: |
| 320 | default: |
| 321 | return fmt.Errorf("fakedb_test: invalid argument #%d: %v, type %T", n+1, arg, arg) |
| 322 | } |
| 323 | } |
| 324 | return nil |
| 325 | } |
| 326 | |
| 327 | func (c *fakeConn) Exec(query string, args []driver.Value) (driver.Result, error) { |
| 328 | // This is an optional interface, but it's implemented here |
| 329 | // just to check that all the args are of the proper types. |
| 330 | // ErrSkip is returned so the caller acts as if we didn't |
| 331 | // implement this at all. |
| 332 | err := checkSubsetTypes(args) |
| 333 | if err != nil { |
| 334 | return nil, err |
| 335 | } |
| 336 | return nil, driver.ErrSkip |
| 337 | } |
| 338 | |
| 339 | func (c *fakeConn) Query(query string, args []driver.Value) (driver.Rows, error) { |
| 340 | // This is an optional interface, but it's implemented here |
| 341 | // just to check that all the args are of the proper types. |
| 342 | // ErrSkip is returned so the caller acts as if we didn't |
| 343 | // implement this at all. |
| 344 | err := checkSubsetTypes(args) |
| 345 | if err != nil { |
| 346 | return nil, err |
| 347 | } |
| 348 | return nil, driver.ErrSkip |
| 349 | } |
| 350 | |
| 351 | func errf(msg string, args ...interface{}) error { |
| 352 | return errors.New("fakedb: " + fmt.Sprintf(msg, args...)) |
| 353 | } |
| 354 | |
| 355 | // parts are table|selectCol1,selectCol2|whereCol=?,whereCol2=? |
| 356 | // (note that where columns must always contain ? marks, |
| 357 | // just a limitation for fakedb) |
| 358 | func (c *fakeConn) prepareSelect(stmt *fakeStmt, parts []string) (driver.Stmt, error) { |
| 359 | if len(parts) != 3 { |
| 360 | stmt.Close() |
| 361 | return nil, errf("invalid SELECT syntax with %d parts; want 3", len(parts)) |
| 362 | } |
| 363 | stmt.table = parts[0] |
| 364 | stmt.colName = strings.Split(parts[1], ",") |
| 365 | for n, colspec := range strings.Split(parts[2], ",") { |
| 366 | if colspec == "" { |
| 367 | continue |
| 368 | } |
| 369 | nameVal := strings.Split(colspec, "=") |
| 370 | if len(nameVal) != 2 { |
| 371 | stmt.Close() |
| 372 | return nil, errf("SELECT on table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n) |
| 373 | } |
| 374 | column, value := nameVal[0], nameVal[1] |
| 375 | _, ok := c.db.columnType(stmt.table, column) |
| 376 | if !ok { |
| 377 | stmt.Close() |
| 378 | return nil, errf("SELECT on table %q references non-existent column %q", stmt.table, column) |
| 379 | } |
| 380 | if value != "?" { |
| 381 | stmt.Close() |
| 382 | return nil, errf("SELECT on table %q has pre-bound value for where column %q; need a question mark", |
| 383 | stmt.table, column) |
| 384 | } |
| 385 | stmt.whereCol = append(stmt.whereCol, column) |
| 386 | stmt.placeholders++ |
| 387 | } |
| 388 | return stmt, nil |
| 389 | } |
| 390 | |
| 391 | // parts are table|col=type,col2=type2 |
| 392 | func (c *fakeConn) prepareCreate(stmt *fakeStmt, parts []string) (driver.Stmt, error) { |
| 393 | if len(parts) != 2 { |
| 394 | stmt.Close() |
| 395 | return nil, errf("invalid CREATE syntax with %d parts; want 2", len(parts)) |
| 396 | } |
| 397 | stmt.table = parts[0] |
| 398 | for n, colspec := range strings.Split(parts[1], ",") { |
| 399 | nameType := strings.Split(colspec, "=") |
| 400 | if len(nameType) != 2 { |
| 401 | stmt.Close() |
| 402 | return nil, errf("CREATE table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n) |
| 403 | } |
| 404 | stmt.colName = append(stmt.colName, nameType[0]) |
| 405 | stmt.colType = append(stmt.colType, nameType[1]) |
| 406 | } |
| 407 | return stmt, nil |
| 408 | } |
| 409 | |
| 410 | // parts are table|col=?,col2=val |
| 411 | func (c *fakeConn) prepareInsert(stmt *fakeStmt, parts []string) (driver.Stmt, error) { |
| 412 | if len(parts) != 2 { |
| 413 | stmt.Close() |
| 414 | return nil, errf("invalid INSERT syntax with %d parts; want 2", len(parts)) |
| 415 | } |
| 416 | stmt.table = parts[0] |
| 417 | for n, colspec := range strings.Split(parts[1], ",") { |
| 418 | nameVal := strings.Split(colspec, "=") |
| 419 | if len(nameVal) != 2 { |
| 420 | stmt.Close() |
| 421 | return nil, errf("INSERT table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n) |
| 422 | } |
| 423 | column, value := nameVal[0], nameVal[1] |
| 424 | ctype, ok := c.db.columnType(stmt.table, column) |
| 425 | if !ok { |
| 426 | stmt.Close() |
| 427 | return nil, errf("INSERT table %q references non-existent column %q", stmt.table, column) |
| 428 | } |
| 429 | stmt.colName = append(stmt.colName, column) |
| 430 | |
| 431 | if value != "?" { |
| 432 | var subsetVal interface{} |
| 433 | // Convert to driver subset type |
| 434 | switch ctype { |
| 435 | case "string": |
| 436 | subsetVal = []byte(value) |
| 437 | case "blob": |
| 438 | subsetVal = []byte(value) |
| 439 | case "int32": |
| 440 | i, err := strconv.Atoi(value) |
| 441 | if err != nil { |
| 442 | stmt.Close() |
| 443 | return nil, errf("invalid conversion to int32 from %q", value) |
| 444 | } |
| 445 | subsetVal = int64(i) // int64 is a subset type, but not int32 |
| 446 | default: |
| 447 | stmt.Close() |
| 448 | return nil, errf("unsupported conversion for pre-bound parameter %q to type %q", value, ctype) |
| 449 | } |
| 450 | stmt.colValue = append(stmt.colValue, subsetVal) |
| 451 | } else { |
| 452 | stmt.placeholders++ |
| 453 | stmt.placeholderConverter = append(stmt.placeholderConverter, converterForType(ctype)) |
| 454 | stmt.colValue = append(stmt.colValue, "?") |
| 455 | } |
| 456 | } |
| 457 | return stmt, nil |
| 458 | } |
| 459 | |
| 460 | // hook to simulate broken connections |
| 461 | var hookPrepareBadConn func() bool |
| 462 | |
| 463 | func (c *fakeConn) Prepare(query string) (driver.Stmt, error) { |
| 464 | c.numPrepare++ |
| 465 | if c.db == nil { |
| 466 | panic("nil c.db; conn = " + fmt.Sprintf("%#v", c)) |
| 467 | } |
| 468 | |
| 469 | if hookPrepareBadConn != nil && hookPrepareBadConn() { |
| 470 | return nil, driver.ErrBadConn |
| 471 | } |
| 472 | |
| 473 | parts := strings.Split(query, "|") |
| 474 | if len(parts) < 1 { |
| 475 | return nil, errf("empty query") |
| 476 | } |
| 477 | cmd := parts[0] |
| 478 | parts = parts[1:] |
| 479 | stmt := &fakeStmt{q: query, c: c, cmd: cmd} |
| 480 | c.incrStat(&c.stmtsMade) |
| 481 | switch cmd { |
| 482 | case "WIPE": |
| 483 | // Nothing |
| 484 | case "SELECT": |
| 485 | return c.prepareSelect(stmt, parts) |
| 486 | case "CREATE": |
| 487 | return c.prepareCreate(stmt, parts) |
| 488 | case "INSERT": |
| 489 | return c.prepareInsert(stmt, parts) |
| 490 | case "NOSERT": |
| 491 | // Do all the prep-work like for an INSERT but don't actually insert the row. |
| 492 | // Used for some of the concurrent tests. |
| 493 | return c.prepareInsert(stmt, parts) |
| 494 | default: |
| 495 | stmt.Close() |
| 496 | return nil, errf("unsupported command type %q", cmd) |
| 497 | } |
| 498 | return stmt, nil |
| 499 | } |
| 500 | |
| 501 | func (s *fakeStmt) ColumnConverter(idx int) driver.ValueConverter { |
| 502 | if len(s.placeholderConverter) == 0 { |
| 503 | return driver.DefaultParameterConverter |
| 504 | } |
| 505 | return s.placeholderConverter[idx] |
| 506 | } |
| 507 | |
| 508 | func (s *fakeStmt) Close() error { |
| 509 | if s.c == nil { |
| 510 | panic("nil conn in fakeStmt.Close") |
| 511 | } |
| 512 | if s.c.db == nil { |
| 513 | panic("in fakeStmt.Close, conn's db is nil (already closed)") |
| 514 | } |
| 515 | if !s.closed { |
| 516 | s.c.incrStat(&s.c.stmtsClosed) |
| 517 | s.closed = true |
| 518 | } |
| 519 | return nil |
| 520 | } |
| 521 | |
| 522 | var errClosed = errors.New("fakedb: statement has been closed") |
| 523 | |
| 524 | // hook to simulate broken connections |
| 525 | var hookExecBadConn func() bool |
| 526 | |
| 527 | func (s *fakeStmt) Exec(args []driver.Value) (driver.Result, error) { |
| 528 | if s.closed { |
| 529 | return nil, errClosed |
| 530 | } |
| 531 | |
| 532 | if hookExecBadConn != nil && hookExecBadConn() { |
| 533 | return nil, driver.ErrBadConn |
| 534 | } |
| 535 | |
| 536 | err := checkSubsetTypes(args) |
| 537 | if err != nil { |
| 538 | return nil, err |
| 539 | } |
| 540 | |
| 541 | db := s.c.db |
| 542 | switch s.cmd { |
| 543 | case "WIPE": |
| 544 | db.wipe() |
| 545 | return driver.ResultNoRows, nil |
| 546 | case "CREATE": |
| 547 | if err := db.createTable(s.table, s.colName, s.colType); err != nil { |
| 548 | return nil, err |
| 549 | } |
| 550 | return driver.ResultNoRows, nil |
| 551 | case "INSERT": |
| 552 | return s.execInsert(args, true) |
| 553 | case "NOSERT": |
| 554 | // Do all the prep-work like for an INSERT but don't actually insert the row. |
| 555 | // Used for some of the concurrent tests. |
| 556 | return s.execInsert(args, false) |
| 557 | } |
| 558 | fmt.Printf("EXEC statement, cmd=%q: %#v\n", s.cmd, s) |
| 559 | return nil, fmt.Errorf("unimplemented statement Exec command type of %q", s.cmd) |
| 560 | } |
| 561 | |
| 562 | // When doInsert is true, add the row to the table. |
| 563 | // When doInsert is false do prep-work and error checking, but don't |
| 564 | // actually add the row to the table. |
| 565 | func (s *fakeStmt) execInsert(args []driver.Value, doInsert bool) (driver.Result, error) { |
| 566 | db := s.c.db |
| 567 | if len(args) != s.placeholders { |
| 568 | panic("error in pkg db; should only get here if size is correct") |
| 569 | } |
| 570 | db.mu.Lock() |
| 571 | t, ok := db.table(s.table) |
| 572 | db.mu.Unlock() |
| 573 | if !ok { |
| 574 | return nil, fmt.Errorf("fakedb: table %q doesn't exist", s.table) |
| 575 | } |
| 576 | |
| 577 | t.mu.Lock() |
| 578 | defer t.mu.Unlock() |
| 579 | |
| 580 | var cols []interface{} |
| 581 | if doInsert { |
| 582 | cols = make([]interface{}, len(t.colname)) |
| 583 | } |
| 584 | argPos := 0 |
| 585 | for n, colname := range s.colName { |
| 586 | colidx := t.columnIndex(colname) |
| 587 | if colidx == -1 { |
| 588 | return nil, fmt.Errorf("fakedb: column %q doesn't exist or dropped since prepared statement was created", colname) |
| 589 | } |
| 590 | var val interface{} |
| 591 | if strvalue, ok := s.colValue[n].(string); ok && strvalue == "?" { |
| 592 | val = args[argPos] |
| 593 | argPos++ |
| 594 | } else { |
| 595 | val = s.colValue[n] |
| 596 | } |
| 597 | if doInsert { |
| 598 | cols[colidx] = val |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | if doInsert { |
| 603 | t.rows = append(t.rows, &row{cols: cols}) |
| 604 | } |
| 605 | return driver.RowsAffected(1), nil |
| 606 | } |
| 607 | |
| 608 | // hook to simulate broken connections |
| 609 | var hookQueryBadConn func() bool |
| 610 | |
| 611 | func (s *fakeStmt) Query(args []driver.Value) (driver.Rows, error) { |
| 612 | if s.closed { |
| 613 | return nil, errClosed |
| 614 | } |
| 615 | |
| 616 | if hookQueryBadConn != nil && hookQueryBadConn() { |
| 617 | return nil, driver.ErrBadConn |
| 618 | } |
| 619 | |
| 620 | err := checkSubsetTypes(args) |
| 621 | if err != nil { |
| 622 | return nil, err |
| 623 | } |
| 624 | |
| 625 | db := s.c.db |
| 626 | if len(args) != s.placeholders { |
| 627 | panic("error in pkg db; should only get here if size is correct") |
| 628 | } |
| 629 | |
| 630 | db.mu.Lock() |
| 631 | t, ok := db.table(s.table) |
| 632 | db.mu.Unlock() |
| 633 | if !ok { |
| 634 | return nil, fmt.Errorf("fakedb: table %q doesn't exist", s.table) |
| 635 | } |
| 636 | |
| 637 | if s.table == "magicquery" { |
| 638 | if len(s.whereCol) == 2 && s.whereCol[0] == "op" && s.whereCol[1] == "millis" { |
| 639 | if args[0] == "sleep" { |
| 640 | time.Sleep(time.Duration(args[1].(int64)) * time.Millisecond) |
| 641 | } |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | t.mu.Lock() |
| 646 | defer t.mu.Unlock() |
| 647 | |
| 648 | colIdx := make(map[string]int) // select column name -> column index in table |
| 649 | for _, name := range s.colName { |
| 650 | idx := t.columnIndex(name) |
| 651 | if idx == -1 { |
| 652 | return nil, fmt.Errorf("fakedb: unknown column name %q", name) |
| 653 | } |
| 654 | colIdx[name] = idx |
| 655 | } |
| 656 | |
| 657 | mrows := []*row{} |
| 658 | rows: |
| 659 | for _, trow := range t.rows { |
| 660 | // Process the where clause, skipping non-match rows. This is lazy |
| 661 | // and just uses fmt.Sprintf("%v") to test equality. Good enough |
| 662 | // for test code. |
| 663 | for widx, wcol := range s.whereCol { |
| 664 | idx := t.columnIndex(wcol) |
| 665 | if idx == -1 { |
| 666 | return nil, fmt.Errorf("db: invalid where clause column %q", wcol) |
| 667 | } |
| 668 | tcol := trow.cols[idx] |
| 669 | if bs, ok := tcol.([]byte); ok { |
| 670 | // lazy hack to avoid sprintf %v on a []byte |
| 671 | tcol = string(bs) |
| 672 | } |
| 673 | if fmt.Sprintf("%v", tcol) != fmt.Sprintf("%v", args[widx]) { |
| 674 | continue rows |
| 675 | } |
| 676 | } |
| 677 | mrow := &row{cols: make([]interface{}, len(s.colName))} |
| 678 | for seli, name := range s.colName { |
| 679 | mrow.cols[seli] = trow.cols[colIdx[name]] |
| 680 | } |
| 681 | mrows = append(mrows, mrow) |
| 682 | } |
| 683 | |
| 684 | cursor := &rowsCursor{ |
| 685 | pos: -1, |
| 686 | rows: mrows, |
| 687 | cols: s.colName, |
| 688 | errPos: -1, |
| 689 | } |
| 690 | return cursor, nil |
| 691 | } |
| 692 | |
| 693 | func (s *fakeStmt) NumInput() int { |
| 694 | return s.placeholders |
| 695 | } |
| 696 | |
| 697 | func (tx *fakeTx) Commit() error { |
| 698 | tx.c.currTx = nil |
| 699 | return nil |
| 700 | } |
| 701 | |
| 702 | func (tx *fakeTx) Rollback() error { |
| 703 | tx.c.currTx = nil |
| 704 | return nil |
| 705 | } |
| 706 | |
| 707 | type rowsCursor struct { |
| 708 | cols []string |
| 709 | pos int |
| 710 | rows []*row |
| 711 | closed bool |
| 712 | |
| 713 | // errPos and err are for making Next return early with error. |
| 714 | errPos int |
| 715 | err error |
| 716 | |
| 717 | // a clone of slices to give out to clients, indexed by the |
| 718 | // the original slice's first byte address. we clone them |
| 719 | // just so we're able to corrupt them on close. |
| 720 | bytesClone map[*byte][]byte |
| 721 | } |
| 722 | |
| 723 | func (rc *rowsCursor) Close() error { |
| 724 | if !rc.closed { |
| 725 | for _, bs := range rc.bytesClone { |
| 726 | bs[0] = 255 // first byte corrupted |
| 727 | } |
| 728 | } |
| 729 | rc.closed = true |
| 730 | return nil |
| 731 | } |
| 732 | |
| 733 | func (rc *rowsCursor) Columns() []string { |
| 734 | return rc.cols |
| 735 | } |
| 736 | |
| 737 | var rowsCursorNextHook func(dest []driver.Value) error |
| 738 | |
| 739 | func (rc *rowsCursor) Next(dest []driver.Value) error { |
| 740 | if rowsCursorNextHook != nil { |
| 741 | return rowsCursorNextHook(dest) |
| 742 | } |
| 743 | |
| 744 | if rc.closed { |
| 745 | return errors.New("fakedb: cursor is closed") |
| 746 | } |
| 747 | rc.pos++ |
| 748 | if rc.pos == rc.errPos { |
| 749 | return rc.err |
| 750 | } |
| 751 | if rc.pos >= len(rc.rows) { |
| 752 | return io.EOF // per interface spec |
| 753 | } |
| 754 | for i, v := range rc.rows[rc.pos].cols { |
| 755 | // TODO(bradfitz): convert to subset types? naah, I |
| 756 | // think the subset types should only be input to |
| 757 | // driver, but the sql package should be able to handle |
| 758 | // a wider range of types coming out of drivers. all |
| 759 | // for ease of drivers, and to prevent drivers from |
| 760 | // messing up conversions or doing them differently. |
| 761 | dest[i] = v |
| 762 | |
| 763 | if bs, ok := v.([]byte); ok { |
| 764 | if rc.bytesClone == nil { |
| 765 | rc.bytesClone = make(map[*byte][]byte) |
| 766 | } |
| 767 | clone, ok := rc.bytesClone[&bs[0]] |
| 768 | if !ok { |
| 769 | clone = make([]byte, len(bs)) |
| 770 | copy(clone, bs) |
| 771 | rc.bytesClone[&bs[0]] = clone |
| 772 | } |
| 773 | dest[i] = clone |
| 774 | } |
| 775 | } |
| 776 | return nil |
| 777 | } |
| 778 | |
| 779 | // fakeDriverString is like driver.String, but indirects pointers like |
| 780 | // DefaultValueConverter. |
| 781 | // |
| 782 | // This could be surprising behavior to retroactively apply to |
| 783 | // driver.String now that Go1 is out, but this is convenient for |
| 784 | // our TestPointerParamsAndScans. |
| 785 | // |
| 786 | type fakeDriverString struct{} |
| 787 | |
| 788 | func (fakeDriverString) ConvertValue(v interface{}) (driver.Value, error) { |
| 789 | switch c := v.(type) { |
| 790 | case string, []byte: |
| 791 | return v, nil |
| 792 | case *string: |
| 793 | if c == nil { |
| 794 | return nil, nil |
| 795 | } |
| 796 | return *c, nil |
| 797 | } |
| 798 | return fmt.Sprintf("%v", v), nil |
| 799 | } |
| 800 | |
| 801 | func converterForType(typ string) driver.ValueConverter { |
| 802 | switch typ { |
| 803 | case "bool": |
| 804 | return driver.Bool |
| 805 | case "nullbool": |
| 806 | return driver.Null{Converter: driver.Bool} |
| 807 | case "int32": |
| 808 | return driver.Int32 |
| 809 | case "string": |
| 810 | return driver.NotNull{Converter: fakeDriverString{}} |
| 811 | case "nullstring": |
| 812 | return driver.Null{Converter: fakeDriverString{}} |
| 813 | case "int64": |
| 814 | // TODO(coopernurse): add type-specific converter |
| 815 | return driver.NotNull{Converter: driver.DefaultParameterConverter} |
| 816 | case "nullint64": |
| 817 | // TODO(coopernurse): add type-specific converter |
| 818 | return driver.Null{Converter: driver.DefaultParameterConverter} |
| 819 | case "float64": |
| 820 | // TODO(coopernurse): add type-specific converter |
| 821 | return driver.NotNull{Converter: driver.DefaultParameterConverter} |
| 822 | case "nullfloat64": |
| 823 | // TODO(coopernurse): add type-specific converter |
| 824 | return driver.Null{Converter: driver.DefaultParameterConverter} |
| 825 | case "datetime": |
| 826 | return driver.DefaultParameterConverter |
| 827 | } |
| 828 | panic("invalid fakedb column type of " + typ) |
| 829 | } |