Add db-connect, a SQL over HTTPS server

vendor/github.com/kshvakov/clickhouse/clickhouse_read_meta.go

@@ -0,0 +1,53 @@
+package clickhouse
+
+import (
+	"fmt"
+
+	"github.com/kshvakov/clickhouse/lib/data"
+	"github.com/kshvakov/clickhouse/lib/protocol"
+)
+
+func (ch *clickhouse) readMeta() (*data.Block, error) {
+	for {
+		packet, err := ch.decoder.Uvarint()
+		if err != nil {
+			return nil, err
+		}
+
+		switch packet {
+		case protocol.ServerException:
+			ch.logf("[read meta] <- exception")
+			return nil, ch.exception()
+		case protocol.ServerProgress:
+			progress, err := ch.progress()
+			if err != nil {
+				return nil, err
+			}
+			ch.logf("[read meta] <- progress: rows=%d, bytes=%d, total rows=%d",
+				progress.rows,
+				progress.bytes,
+				progress.totalRows,
+			)
+		case protocol.ServerProfileInfo:
+			profileInfo, err := ch.profileInfo()
+			if err != nil {
+				return nil, err
+			}
+			ch.logf("[read meta] <- profiling: rows=%d, bytes=%d, blocks=%d", profileInfo.rows, profileInfo.bytes, profileInfo.blocks)
+		case protocol.ServerData:
+			block, err := ch.readBlock()
+			if err != nil {
+				return nil, err
+			}
+			ch.logf("[read meta] <- data: packet=%d, columns=%d, rows=%d", packet, block.NumColumns, block.NumRows)
+			return block, nil
+		case protocol.ServerEndOfStream:
+			_, err := ch.readBlock()
+			ch.logf("[process] <- end of stream")
+			return nil, err
+		default:
+			ch.conn.Close()
+			return nil, fmt.Errorf("[read meta] unexpected packet [%d] from server", packet)
+		}
+	}
+}