diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/lib/pq/copy.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/lib/pq/copy.go | 267 |
1 files changed, 0 insertions, 267 deletions
diff --git a/Godeps/_workspace/src/github.com/lib/pq/copy.go b/Godeps/_workspace/src/github.com/lib/pq/copy.go deleted file mode 100644 index 101f11133..000000000 --- a/Godeps/_workspace/src/github.com/lib/pq/copy.go +++ /dev/null @@ -1,267 +0,0 @@ -package pq - -import ( - "database/sql/driver" - "encoding/binary" - "errors" - "fmt" - "sync" -) - -var ( - errCopyInClosed = errors.New("pq: copyin statement has already been closed") - errBinaryCopyNotSupported = errors.New("pq: only text format supported for COPY") - errCopyToNotSupported = errors.New("pq: COPY TO is not supported") - errCopyNotSupportedOutsideTxn = errors.New("pq: COPY is only allowed inside a transaction") -) - -// CopyIn creates a COPY FROM statement which can be prepared with -// Tx.Prepare(). The target table should be visible in search_path. -func CopyIn(table string, columns ...string) string { - stmt := "COPY " + QuoteIdentifier(table) + " (" - for i, col := range columns { - if i != 0 { - stmt += ", " - } - stmt += QuoteIdentifier(col) - } - stmt += ") FROM STDIN" - return stmt -} - -// CopyInSchema creates a COPY FROM statement which can be prepared with -// Tx.Prepare(). -func CopyInSchema(schema, table string, columns ...string) string { - stmt := "COPY " + QuoteIdentifier(schema) + "." + QuoteIdentifier(table) + " (" - for i, col := range columns { - if i != 0 { - stmt += ", " - } - stmt += QuoteIdentifier(col) - } - stmt += ") FROM STDIN" - return stmt -} - -type copyin struct { - cn *conn - buffer []byte - rowData chan []byte - done chan bool - - closed bool - - sync.Mutex // guards err - err error -} - -const ciBufferSize = 64 * 1024 - -// flush buffer before the buffer is filled up and needs reallocation -const ciBufferFlushSize = 63 * 1024 - -func (cn *conn) prepareCopyIn(q string) (_ driver.Stmt, err error) { - if !cn.isInTransaction() { - return nil, errCopyNotSupportedOutsideTxn - } - - ci := ©in{ - cn: cn, - buffer: make([]byte, 0, ciBufferSize), - rowData: make(chan []byte), - done: make(chan bool, 1), - } - // add CopyData identifier + 4 bytes for message length - ci.buffer = append(ci.buffer, 'd', 0, 0, 0, 0) - - b := cn.writeBuf('Q') - b.string(q) - cn.send(b) - -awaitCopyInResponse: - for { - t, r := cn.recv1() - switch t { - case 'G': - if r.byte() != 0 { - err = errBinaryCopyNotSupported - break awaitCopyInResponse - } - go ci.resploop() - return ci, nil - case 'H': - err = errCopyToNotSupported - break awaitCopyInResponse - case 'E': - err = parseError(r) - case 'Z': - if err == nil { - cn.bad = true - errorf("unexpected ReadyForQuery in response to COPY") - } - cn.processReadyForQuery(r) - return nil, err - default: - cn.bad = true - errorf("unknown response for copy query: %q", t) - } - } - - // something went wrong, abort COPY before we return - b = cn.writeBuf('f') - b.string(err.Error()) - cn.send(b) - - for { - t, r := cn.recv1() - switch t { - case 'c', 'C', 'E': - case 'Z': - // correctly aborted, we're done - cn.processReadyForQuery(r) - return nil, err - default: - cn.bad = true - errorf("unknown response for CopyFail: %q", t) - } - } -} - -func (ci *copyin) flush(buf []byte) { - // set message length (without message identifier) - binary.BigEndian.PutUint32(buf[1:], uint32(len(buf)-1)) - - _, err := ci.cn.c.Write(buf) - if err != nil { - panic(err) - } -} - -func (ci *copyin) resploop() { - for { - var r readBuf - t, err := ci.cn.recvMessage(&r) - if err != nil { - ci.cn.bad = true - ci.setError(err) - ci.done <- true - return - } - switch t { - case 'C': - // complete - case 'N': - // NoticeResponse - case 'Z': - ci.cn.processReadyForQuery(&r) - ci.done <- true - return - case 'E': - err := parseError(&r) - ci.setError(err) - default: - ci.cn.bad = true - ci.setError(fmt.Errorf("unknown response during CopyIn: %q", t)) - ci.done <- true - return - } - } -} - -func (ci *copyin) isErrorSet() bool { - ci.Lock() - isSet := (ci.err != nil) - ci.Unlock() - return isSet -} - -// setError() sets ci.err if one has not been set already. Caller must not be -// holding ci.Mutex. -func (ci *copyin) setError(err error) { - ci.Lock() - if ci.err == nil { - ci.err = err - } - ci.Unlock() -} - -func (ci *copyin) NumInput() int { - return -1 -} - -func (ci *copyin) Query(v []driver.Value) (r driver.Rows, err error) { - return nil, ErrNotSupported -} - -// Exec inserts values into the COPY stream. The insert is asynchronous -// and Exec can return errors from previous Exec calls to the same -// COPY stmt. -// -// You need to call Exec(nil) to sync the COPY stream and to get any -// errors from pending data, since Stmt.Close() doesn't return errors -// to the user. -func (ci *copyin) Exec(v []driver.Value) (r driver.Result, err error) { - if ci.closed { - return nil, errCopyInClosed - } - - if ci.cn.bad { - return nil, driver.ErrBadConn - } - defer ci.cn.errRecover(&err) - - if ci.isErrorSet() { - return nil, ci.err - } - - if len(v) == 0 { - return nil, ci.Close() - } - - numValues := len(v) - for i, value := range v { - ci.buffer = appendEncodedText(&ci.cn.parameterStatus, ci.buffer, value) - if i < numValues-1 { - ci.buffer = append(ci.buffer, '\t') - } - } - - ci.buffer = append(ci.buffer, '\n') - - if len(ci.buffer) > ciBufferFlushSize { - ci.flush(ci.buffer) - // reset buffer, keep bytes for message identifier and length - ci.buffer = ci.buffer[:5] - } - - return driver.RowsAffected(0), nil -} - -func (ci *copyin) Close() (err error) { - if ci.closed { // Don't do anything, we're already closed - return nil - } - ci.closed = true - - if ci.cn.bad { - return driver.ErrBadConn - } - defer ci.cn.errRecover(&err) - - if len(ci.buffer) > 0 { - ci.flush(ci.buffer) - } - // Avoid touching the scratch buffer as resploop could be using it. - err = ci.cn.sendSimpleMessage('c') - if err != nil { - return err - } - - <-ci.done - - if ci.isErrorSet() { - err = ci.err - return err - } - return nil -} |