STOR-519: Add db-connect, a SQL over HTTPS server

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

@@ -0,0 +1,52 @@
+package clickhouse
+
+import (
+	"github.com/kshvakov/clickhouse/lib/data"
+	"github.com/kshvakov/clickhouse/lib/protocol"
+)
+
+func (ch *clickhouse) sendQuery(query string) error {
+	ch.logf("[send query] %s", query)
+	if err := ch.encoder.Uvarint(protocol.ClientQuery); err != nil {
+		return err
+	}
+	if err := ch.encoder.String(""); err != nil {
+		return err
+	}
+	{ // client info
+		ch.encoder.Uvarint(1)
+		ch.encoder.String("")
+		ch.encoder.String("") //initial_query_id
+		ch.encoder.String("[::ffff:127.0.0.1]:0")
+		ch.encoder.Uvarint(1) // iface type TCP
+		ch.encoder.String(hostname)
+		ch.encoder.String(hostname)
+	}
+	if err := ch.ClientInfo.Write(ch.encoder); err != nil {
+		return err
+	}
+	if ch.ServerInfo.Revision >= protocol.DBMS_MIN_REVISION_WITH_QUOTA_KEY_IN_CLIENT_INFO {
+		ch.encoder.String("")
+	}
+
+	if err := ch.encoder.String(""); err != nil { // settings
+		return err
+	}
+	if err := ch.encoder.Uvarint(protocol.StateComplete); err != nil {
+		return err
+	}
+	compress := protocol.CompressDisable
+	if ch.compress {
+		compress = protocol.CompressEnable
+	}
+	if err := ch.encoder.Uvarint(compress); err != nil {
+		return err
+	}
+	if err := ch.encoder.String(query); err != nil {
+		return err
+	}
+	if err := ch.writeBlock(&data.Block{}); err != nil {
+		return err
+	}
+	return ch.encoder.Flush()
+}