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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| package query | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| ) | ||
|
|
||
| func (f *EveryFrame) Decode() (Frame, error) { | ||
| switch f.FrameType { | ||
| case DataSetHeaderFrameType: | ||
| return &DataSetHeader{ | ||
| IsProgressive: f.IsProgressive, | ||
| Version: f.Version, | ||
| IsFragmented: f.IsFragmented, | ||
| ErrorReportingPlacement: f.ErrorReportingPlacement, | ||
| }, nil | ||
| case DataTableFrameType: | ||
| return &DataTable{ | ||
| TableId: f.TableId, | ||
| TableKind: f.TableKind, | ||
| TableName: f.TableName, | ||
| Columns: f.Columns, | ||
| Rows: f.Rows, | ||
| }, nil | ||
| case TableHeaderFrameType: | ||
| return &TableHeader{ | ||
| TableId: f.TableId, | ||
| TableKind: f.TableKind, | ||
| TableName: f.TableName, | ||
| Columns: f.Columns, | ||
| }, nil | ||
| case TableFragmentFrameType: | ||
| return &TableFragment{ | ||
| TableFragmentType: f.TableFragmentType, | ||
| TableId: f.TableId, | ||
| Rows: f.Rows, | ||
| }, nil | ||
| case TableCompletionFrameType: | ||
| return &TableCompletion{ | ||
| TableId: f.TableId, | ||
| RowCount: f.RowCount, | ||
| OneApiErrors: f.OneApiErrors, | ||
| }, nil | ||
| case DataSetCompletionFrameType: | ||
| return &DataSetCompletion{ | ||
| HasErrors: f.HasErrors, | ||
| Cancelled: f.Cancelled, | ||
| OneApiErrors: f.OneApiErrors, | ||
| }, nil | ||
| default: | ||
| return nil, fmt.Errorf("unknown frame type: %s", f.FrameType) | ||
| } | ||
| } | ||
|
|
||
| func ReadFrames(r io.Reader, ch chan<- Frame) error { | ||
| dec := json.NewDecoder(&skipReader{r: r}) | ||
|
|
||
| for { | ||
| frame := EveryFrame{} | ||
| err := dec.Decode(&frame) | ||
| if err != nil { | ||
| if err == io.EOF { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
|
|
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| f, err := frame.Decode() | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| ch <- f | ||
| } | ||
| } | ||
|
|
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| type skipReader struct { | ||
| r io.Reader | ||
| afterStart bool | ||
| } | ||
|
|
||
| func (s *skipReader) Read(p []byte) (n int, err error) { | ||
| // skip '[' at the beginning | ||
| if !s.afterStart { | ||
| s.afterStart = true | ||
|
|
||
| buf := make([]byte, 1) | ||
| amt, err := s.r.Read(buf) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| if amt != 1 || buf[0] != '[' { | ||
| return 0, fmt.Errorf("expected '[' at the beginning of the stream, got '%c'", buf[0]) | ||
| } | ||
| } | ||
|
|
||
| cp := make([]byte, len(p)+1) | ||
| amt, err := s.r.Read(cp[:len(p)]) | ||
| pIndex := 0 | ||
| skipNext := false | ||
|
|
||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| if cp[amt-1] == '\n' { | ||
| _, err = s.r.Read(cp[amt:]) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| if cp[amt] != ']' && cp[amt] != ',' { | ||
| return 0, fmt.Errorf("expected ']' or ',' at the end of the stream, got '%c'", cp[amt]) | ||
| } | ||
| amt++ | ||
| } | ||
|
|
||
| for i := 0; i < amt; i++ { | ||
| if skipNext { | ||
| skipNext = false | ||
| next := cp[i] | ||
| if next == ']' { | ||
| return i, io.EOF | ||
| } else if next != ',' { | ||
| return 0, fmt.Errorf("expected ',' between frames, got '%c'", next) | ||
| } | ||
| continue | ||
| } | ||
| if cp[i] == '\n' { | ||
| skipNext = true | ||
| } | ||
| p[pIndex] = cp[i] | ||
| pIndex++ | ||
|
|
||
| } | ||
|
|
||
| return pIndex, err | ||
| } |