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Merge pull request #3 from metrico/clickhouse-driver
feat: Add Native Clickhouse driver
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| package sql | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/InfluxCommunity/flux" | ||
| "github.com/InfluxCommunity/flux/codes" | ||
| "github.com/InfluxCommunity/flux/execute" | ||
| "github.com/InfluxCommunity/flux/internal/errors" | ||
| "github.com/InfluxCommunity/flux/values" | ||
| "github.com/lib/pq" | ||
| ) | ||
|
|
||
| type ClickhouseRowReader struct { | ||
| Cursor *sql.Rows | ||
| columns []interface{} | ||
| columnTypes []flux.ColType | ||
| columnNames []string | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) Next() bool { | ||
| next := m.Cursor.Next() | ||
| if next { | ||
| columnNames, err := m.Cursor.Columns() | ||
| if err != nil { | ||
| return false | ||
| } | ||
| m.columns = make([]interface{}, len(columnNames)) | ||
| columnPointers := make([]interface{}, len(columnNames)) | ||
| for i := 0; i < len(columnNames); i++ { | ||
| columnPointers[i] = &m.columns[i] | ||
| } | ||
| if err := m.Cursor.Scan(columnPointers...); err != nil { | ||
| return false | ||
| } | ||
| } | ||
| return next | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) GetNextRow() ([]values.Value, error) { | ||
| row := make([]values.Value, len(m.columns)) | ||
| for i, col := range m.columns { | ||
| switch col := col.(type) { | ||
| case bool, int64, uint64, float64, string: | ||
| row[i] = values.New(col) | ||
| case *bool: | ||
| row[i] = values.NewBool(*col) | ||
| case *string: | ||
| row[i] = values.NewString(*col) | ||
| case *int64: | ||
| row[i] = values.NewInt(*col) | ||
| case *uint64: | ||
| row[i] = values.NewUInt(*col) | ||
| case *float64: | ||
| row[i] = values.NewFloat(*col) | ||
| case time.Time: | ||
| row[i] = values.NewTime(values.ConvertTime(col)) | ||
| case []uint8: | ||
| switch m.columnTypes[i] { | ||
| case flux.TInt: | ||
| newInt, err := UInt8ToInt64(col) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| row[i] = values.NewInt(newInt) | ||
| case flux.TFloat: | ||
| newFloat, err := UInt8ToFloat(col) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| row[i] = values.NewFloat(newFloat) | ||
| case flux.TTime: | ||
| t, err := time.Parse(layout, string(col)) | ||
| if err != nil { | ||
| fmt.Print(err) | ||
| } | ||
| row[i] = values.NewTime(values.ConvertTime(t)) | ||
| default: | ||
| row[i] = values.NewString(string(col)) | ||
| } | ||
| case nil: | ||
| row[i] = values.NewNull(flux.SemanticType(m.columnTypes[i])) | ||
| default: | ||
| execute.PanicUnknownType(flux.TInvalid) | ||
| } | ||
| } | ||
| return row, nil | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) InitColumnNames(n []string) { | ||
| m.columnNames = n | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) InitColumnTypes(types []*sql.ColumnType) { | ||
| stringTypes := make([]flux.ColType, len(types)) | ||
| for i := 0; i < len(types); i++ { | ||
| switch types[i].DatabaseTypeName() { | ||
| case "INT", "BIGINT", "SMALLINT", "TINYINT", "INT2", "INT4", "INT8", "SERIAL2", "SERIAL4", "SERIAL8": | ||
| stringTypes[i] = flux.TInt | ||
| case "FLOAT4", "FLOAT8": | ||
| stringTypes[i] = flux.TFloat | ||
| case "DATE", "TIME", "TIMESTAMP": | ||
| stringTypes[i] = flux.TTime | ||
| case "BOOL": | ||
| stringTypes[i] = flux.TBool | ||
| case "TEXT": | ||
| stringTypes[i] = flux.TString | ||
| case "Nullable(UInt64)": | ||
| stringTypes[i] = flux.TUInt | ||
| default: | ||
| stringTypes[i] = flux.TString | ||
| } | ||
| } | ||
| m.columnTypes = stringTypes | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) ColumnNames() []string { | ||
| return m.columnNames | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) ColumnTypes() []flux.ColType { | ||
| return m.columnTypes | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) SetColumns(i []interface{}) { | ||
| m.columns = i | ||
| } | ||
|
|
||
| func (m *ClickhouseRowReader) Close() error { | ||
| if err := m.Cursor.Err(); err != nil { | ||
| return err | ||
| } | ||
| return m.Cursor.Close() | ||
| } | ||
|
|
||
| func NewClickhouseRowReader(r *sql.Rows) (execute.RowReader, error) { | ||
| reader := &ClickhouseRowReader{ | ||
| Cursor: r, | ||
| } | ||
| cols, err := r.Columns() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| reader.InitColumnNames(cols) | ||
|
|
||
| types, err := r.ColumnTypes() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| reader.InitColumnTypes(types) | ||
| return reader, nil | ||
| } | ||
|
|
||
| // ClickhouseTranslateColumn translates flux colTypes into their corresponding Clickhouse column type | ||
| func ClickhouseColumnTranslateFunc() translationFunc { | ||
| c := map[string]string{ | ||
| flux.TFloat.String(): "FLOAT", | ||
| flux.TInt.String(): "BIGINT", | ||
| flux.TUInt.String(): "BIGINT", | ||
| flux.TString.String(): "TEXT", | ||
| flux.TTime.String(): "TIMESTAMP", | ||
| flux.TBool.String(): "BOOL", | ||
| } | ||
| return func(f flux.ColType, colName string) (string, error) { | ||
| s, found := c[f.String()] | ||
| if !found { | ||
| return "", errors.Newf(codes.Internal, "ClickHouseQL does not support column type %s", f.String()) | ||
| } | ||
| return clickhouseQuoteIdent(colName) + " " + s, nil | ||
| } | ||
| } | ||
|
|
||
| func clickhouseQuoteIdent(name string) string { | ||
| return pq.QuoteIdentifier(name) | ||
| } |
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