mirror of
https://github.com/warmcat/libwebsockets.git
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9cb4f25476
This changes the approach of tx credit management to set the initial stream tx credit window to zero. This is the only way with RFC7540 to gain the ability to selectively precisely rx flow control incoming streams. At the time the headers are sent, a WINDOW_UPDATE is sent with the initial tx credit towards us for that specific stream. By default, this acts as before with a 256KB window added for both the stream and the nwsi, and additional window management sent as stuff is received. It's now also possible to set a member in the client info struct and a new option LCCSCF_H2_MANUAL_RXFLOW to precisely manage both the initial tx credit for a specific stream and the ongoing rate limit by meting out further tx credit manually. Add another minimal example http-client-h2-rxflow demonstrating how to force a connection's peer's initial budget to transmit to us and control it during the connection lifetime to restrict the amount of incoming data we have to buffer.
79 lines
2 KiB
CMake
79 lines
2 KiB
CMake
cmake_minimum_required(VERSION 2.8)
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include(CheckCSourceCompiles)
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set(SAMP lws-minimal-http-client-h2-rxflow)
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set(SRCS minimal-http-client.c)
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# If we are being built as part of lws, confirm current build config supports
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# reqconfig, else skip building ourselves.
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#
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# If we are being built externally, confirm installed lws was configured to
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# support reqconfig, else error out with a helpful message about the problem.
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#
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MACRO(require_lws_config reqconfig _val result)
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if (DEFINED ${reqconfig})
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if (${reqconfig})
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set (rq 1)
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else()
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set (rq 0)
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endif()
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else()
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set(rq 0)
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endif()
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if (${_val} EQUAL ${rq})
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set(SAME 1)
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else()
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set(SAME 0)
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endif()
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if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
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if (${_val})
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message("${SAMP}: skipping as lws being built without ${reqconfig}")
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else()
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message("${SAMP}: skipping as lws built with ${reqconfig}")
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endif()
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set(${result} 0)
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else()
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if (LWS_WITH_MINIMAL_EXAMPLES)
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set(MET ${SAME})
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else()
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CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
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if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
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set(HAS_${reqconfig} 0)
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else()
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set(HAS_${reqconfig} 1)
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endif()
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if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
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set(MET 1)
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else()
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set(MET 0)
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endif()
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endif()
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if (NOT MET)
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if (${_val})
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message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
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else()
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message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
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endif()
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endif()
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endif()
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ENDMACRO()
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set(requirements 1)
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require_lws_config(LWS_ROLE_H2 1 requirements)
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require_lws_config(LWS_WITH_CLIENT 1 requirements)
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if (requirements)
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add_executable(${SAMP} ${SRCS})
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if (websockets_shared)
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target_link_libraries(${SAMP} websockets_shared)
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add_dependencies(${SAMP} websockets_shared)
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else()
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target_link_libraries(${SAMP} websockets)
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endif()
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endif()
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