189 lines
5.6 KiB
ReStructuredText
189 lines
5.6 KiB
ReStructuredText
.. cmake-manual-description: CMake Server
|
|
|
|
cmake-server(7)
|
|
***************
|
|
|
|
.. only:: html
|
|
|
|
.. contents::
|
|
|
|
Introduction
|
|
============
|
|
|
|
:manual:`cmake(1)` is capable of providing semantic information about
|
|
CMake code it executes to generate a buildsystem. If executed with
|
|
the ``-E server`` command line options, it starts in a long running mode
|
|
and allows a client to request the available information via a JSON protocol.
|
|
|
|
The protocol is designed to be useful to IDEs, refactoring tools, and
|
|
other tools which have a need to understand the buildsystem in entirety.
|
|
|
|
A single :manual:`cmake-buildsystem(7)` may describe buildsystem contents
|
|
and build properties which differ based on
|
|
:manual:`generation-time context <cmake-generator-expressions(7)>`
|
|
including:
|
|
|
|
* The Platform (eg, Windows, APPLE, Linux).
|
|
* The build configuration (eg, Debug, Release, Coverage).
|
|
* The Compiler (eg, MSVC, GCC, Clang) and compiler version.
|
|
* The language of the source files compiled.
|
|
* Available compile features (eg CXX variadic templates).
|
|
* CMake policies.
|
|
|
|
The protocol aims to provide information to tooling to satisfy several
|
|
needs:
|
|
|
|
#. Provide a complete and easily parsed source of all information relevant
|
|
to the tooling as it relates to the source code. There should be no need
|
|
for tooling to parse generated buildsystems to access include directories
|
|
or compile definitions for example.
|
|
#. Semantic information about the CMake buildsystem itself.
|
|
#. Provide a stable interface for reading the information in the CMake cache.
|
|
#. Information for determining when cmake needs to be re-run as a result of
|
|
file changes.
|
|
|
|
|
|
Operation
|
|
=========
|
|
|
|
Start :manual:`cmake(1)` in the server command mode, supplying the path to
|
|
the build directory to process::
|
|
|
|
cmake -E server
|
|
|
|
The server will start up and reply with an hello message on stdout::
|
|
|
|
[== CMake Server ==[
|
|
{"supportedProtocolVersions":[{"major":0,"minor":1}],"type":"hello"}
|
|
]== CMake Server ==]
|
|
|
|
Messages sent to and from the process are wrapped in magic strings::
|
|
|
|
[== CMake Server ==[
|
|
{
|
|
... some JSON message ...
|
|
}
|
|
]== CMake Server ==]
|
|
|
|
The server is now ready to accept further requests via stdin.
|
|
|
|
|
|
Protocol API
|
|
============
|
|
|
|
|
|
General Message Layout
|
|
----------------------
|
|
|
|
All messages need to have a "type" value, which identifies the type of
|
|
message that is passed back or forth. E.g. the initial message sent by the
|
|
server is of type "hello". Messages without a type will generate an response
|
|
of type "error".
|
|
|
|
All requests sent to the server may contain a "cookie" value. This value
|
|
will he handed back unchanged in all responses triggered by the request.
|
|
|
|
All responses will contain a value "inReplyTo", which may be empty in
|
|
case of parse errors, but will contain the type of the request message
|
|
in all other cases.
|
|
|
|
|
|
Type "reply"
|
|
^^^^^^^^^^^^
|
|
|
|
This type is used by the server to reply to requests.
|
|
|
|
The message may -- depending on the type of the original request --
|
|
contain values.
|
|
|
|
Example::
|
|
|
|
[== CMake Server ==[
|
|
{"cookie":"zimtstern","inReplyTo":"handshake","type":"reply"}
|
|
]== CMake Server ==]
|
|
|
|
|
|
Type "error"
|
|
^^^^^^^^^^^^
|
|
|
|
This type is used to return an error condition to the client. It will
|
|
contain an "errorMessage".
|
|
|
|
Example::
|
|
|
|
[== CMake Server ==[
|
|
{"cookie":"","errorMessage":"Protocol version not supported.","inReplyTo":"handshake","type":"error"}
|
|
]== CMake Server ==]
|
|
|
|
|
|
Type "progress"
|
|
^^^^^^^^^^^^^^^
|
|
|
|
When the server is busy for a long time, it is polite to send back replies of
|
|
type "progress" to the client. These will contain a "progressMessage" with a
|
|
string describing the action currently taking place as well as
|
|
"progressMinimum", "progressMaximum" and "progressCurrent" with integer values
|
|
describing the range of progess.
|
|
|
|
Messages of type "progress" will be followed by more "progress" messages or with
|
|
a message of type "reply" or "error" that complete the request.
|
|
|
|
"progress" messages may not be emitted after the "reply" or "error" message for
|
|
the request that triggered the responses was delivered.
|
|
|
|
|
|
Specific Message Types
|
|
----------------------
|
|
|
|
|
|
Type "hello"
|
|
^^^^^^^^^^^^
|
|
|
|
The initial message send by the cmake server on startup is of type "hello".
|
|
This is the only message ever sent by the server that is not of type "reply",
|
|
"progress" or "error".
|
|
|
|
It will contain "supportedProtocolVersions" with an array of server protocol
|
|
versions supported by the cmake server. These are JSON objects with "major" and
|
|
"minor" keys containing non-negative integer values.
|
|
|
|
Example::
|
|
|
|
[== CMake Server ==[
|
|
{"supportedProtocolVersions":[{"major":0,"minor":1}],"type":"hello"}
|
|
]== CMake Server ==]
|
|
|
|
|
|
Type "handshake"
|
|
^^^^^^^^^^^^^^^^
|
|
|
|
The first request that the client may send to the server is of type "handshake".
|
|
|
|
This request needs to pass one of the "supportedProtocolVersions" of the "hello"
|
|
type response received earlier back to the server in the "protocolVersion" field.
|
|
|
|
Each protocol version may request additional attributes to be present.
|
|
|
|
Protocol version 1.0 requires the following attributes to be set:
|
|
|
|
* "sourceDirectory" with a path to the sources
|
|
* "buildDirectory" with a path to the build directory
|
|
* "generator" with the generator name
|
|
* "extraGenerator" (optional!) with the extra generator to be used.
|
|
|
|
Example::
|
|
|
|
[== CMake Server ==[
|
|
{"cookie":"zimtstern","type":"handshake","protocolVersion":{"major":0},
|
|
"sourceDirectory":"/home/code/cmake", "buildDirectory":"/tmp/testbuild",
|
|
"generator":"Ninja"}
|
|
]== CMake Server ==]
|
|
|
|
which will result in a response type "reply"::
|
|
|
|
[== CMake Server ==[
|
|
{"cookie":"zimtstern","inReplyTo":"handshake","type":"reply"}
|
|
]== CMake Server ==]
|
|
|
|
indicating that the server is ready for action.
|