2012-03-09 15:46:52 +00:00
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#pragma once
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2017-04-01 09:19:00 +00:00
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#include <Core/Types.h>
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2013-08-04 00:42:35 +00:00
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2012-03-09 15:46:52 +00:00
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namespace DB
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{
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2017-04-17 19:26:59 +00:00
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/// Client-server protocol.
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///
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/// Client opens a connection and sends Hello packet.
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/// If client version is incompatible, the server can terminate the connection.
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/// Server responds with Hello packet.
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/// If server version is incompatible, the client can terminate the connection.
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///
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/// The main loop follows:
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///
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/// 1. The client sends Query packet.
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///
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/// Starting from version 50263 immediately after sending the Query packet the client starts
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/// transfer of external (temporary) table (external storages) - one or several Data packets.
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/// End of transmission is marked by an empty block.
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/// At present, non-empty tables can be sent only along with SELECT query.
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///
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/// If the query is an INSERT (and thus requires data transfer from client), then the server transmits
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/// Data packet containing empty block that describes the table structure.
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/// Then the client sends one or several Data packets - data for insertion.
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/// End of data is marked by the transmission of empty block.
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/// Then the server sends EndOfStream packet.
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///
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/// If the query is a SELECT or a query of other type, then the server transmits packets of
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/// one of the following types:
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/// - Data - data corresponding to one block of query results.
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/// - Progress - query execution progress.
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/// - Exception - error description.
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/// - EndOfStream - the end of data transmission.
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///
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/// The client should read packets until EndOfStream or Exception.
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///
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/// The client can also send Cancel packet - a request to cancel the query.
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/// In this case the server can stop executing the query and return incomplete data,
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/// but the client must still read until EndOfStream packet.
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///
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/// Also if there is profiling info and the client revision is recent enough, the server can
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/// send one of the following packets before EndOfStream:
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/// - Totals - a block with total values
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/// - ProfileInfo - serialized BlockStreamProfileInfo structure.
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///
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/// If a query returns data, the server sends an empty header block containing
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/// the description of resulting columns before executing the query.
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/// Using this block the client can initialise the output formatter and display the prefix of resulting table
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/// beforehand.
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2012-03-09 15:46:52 +00:00
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namespace Protocol
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{
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/// Packet types that server transmits.
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namespace Server
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{
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enum Enum
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{
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Hello = 0, /// Name, version, revision.
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Data = 1, /// A block of data (compressed or not).
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Exception = 2, /// The exception during query execution.
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Progress = 3, /// Query execution progress: rows read, bytes read.
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Pong = 4, /// Ping response
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EndOfStream = 5, /// All packets were transmitted
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ProfileInfo = 6, /// Packet with profiling info.
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Totals = 7, /// A block with totals (compressed or not).
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Extremes = 8, /// A block with minimums and maximums (compressed or not).
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TablesStatusResponse = 9, /// A response to TablesStatus request.
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};
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2012-05-23 19:51:30 +00:00
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2017-04-17 19:26:59 +00:00
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/// NOTE: If the type of packet argument would be Enum, the comparison packet >= 0 && packet < 10
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/// would always be true because of compiler optimisation. That would lead to out-of-bounds error
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/// if the packet is invalid.
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/// See https://www.securecoding.cert.org/confluence/display/cplusplus/INT36-CPP.+Do+not+use+out-of-range+enumeration+values
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inline const char * toString(UInt64 packet)
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{
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static const char * data[] = { "Hello", "Data", "Exception", "Progress", "Pong", "EndOfStream", "ProfileInfo", "Totals", "Extremes", "TablesStatusResponse" };
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return packet < 10
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? data[packet]
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: "Unknown packet";
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}
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}
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2012-03-09 15:46:52 +00:00
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2017-04-17 19:26:59 +00:00
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/// Packet types that client transmits.
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namespace Client
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{
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enum Enum
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{
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Hello = 0, /// Name, version, revision, default DB
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Query = 1, /// Query id, query settings, stage up to which the query must be executed,
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/// whether the compression must be used,
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/// query text (without data for INSERTs).
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Data = 2, /// A block of data (compressed or not).
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Cancel = 3, /// Cancel the query execution.
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Ping = 4, /// Check that connection to the server is alive.
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TablesStatusRequest = 5, /// Check status of tables on the server.
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};
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2012-05-23 19:51:30 +00:00
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2017-04-01 07:20:54 +00:00
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inline const char * toString(UInt64 packet)
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{
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static const char * data[] = { "Hello", "Query", "Data", "Cancel", "Ping", "TablesStatusRequest" };
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return packet < 6
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? data[packet]
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: "Unknown packet";
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}
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}
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2012-03-11 08:52:56 +00:00
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2017-04-17 19:26:59 +00:00
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/// Whether the compression must be used.
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enum class Compression
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{
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Disable = 0,
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Enable = 1,
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};
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2017-09-28 19:43:31 +00:00
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/// Whether the ssl must be used.
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2017-10-03 14:52:08 +00:00
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enum class Encryption
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{
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Disable = 0,
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Enable = 1,
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};
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2012-03-09 15:46:52 +00:00
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}
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}
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