[POC] Full Libevent removal #34411

pull fanquake wants to merge 40 commits into bitcoin:master from fanquake:full_libevent_removal changing 55 files +2997 −1489
  1. fanquake commented at 12:35 pm on January 26, 2026: member

    This builds on all the work being done by pinheadmz and fjahr (#32061, #34342, #34158), to demo a libevent-less bitcoind.

    One thing we could decide to change, or not, is the libevent logging catergory. Other than that, any remaining references to libevent, should be in documentation/code comments.

  2. DrahtBot commented at 12:35 pm on January 26, 2026: contributor

    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

    Code Coverage & Benchmarks

    For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/34411.

    Reviews

    See the guideline for information on the review process. A summary of reviews will appear here.

    Conflicts

    Reviewers, this pull request conflicts with the following ones:

    • #34495 (Replace boost signals with minimal compatible implementation by theuni)
    • #34486 (net: Reduce local network activity when networkactive=0 by willcl-ark)
    • #34342 (cli: Replace libevent usage with simple http client by fjahr)
    • #34158 (torcontrol: Remove libevent usage by fjahr)
    • #34143 (build: Prevent system header fallback and include path pollution by hebasto)
    • #33689 (http: replace WorkQueue and single threads handling for ThreadPool by furszy)
    • #32297 (bitcoin-cli: Add -ipcconnect option by ryanofsky)
    • #32061 (Replace libevent with our own HTTP and socket-handling implementation by pinheadmz)
    • #31929 (http: Make server shutdown more robust by hodlinator)
    • #31723 (qa: Facilitate debugging bitcoind inside functional tests by hodlinator)
    • #31425 (RFC: Riscv bare metal CI job by sedited)
    • #26812 (test: add end-to-end tests for CConnman and PeerManager by vasild)
    • #26022 (Add util::ResultPtr class by ryanofsky)
    • #25665 (refactor: Add util::Result failure types and ability to merge result values by ryanofsky)
    • #21283 (Implement BIP 370 PSBTv2 by achow101)

    If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

    LLM Linter (✨ experimental)

    Possible typos and grammar issues:

    • Unrecoverbale -> Unrecoverable [spelling error in comment could momentarily confuse readers]
    • an unique -> a unique [incorrect article before a consonant-starting word; use “a” instead of “an”]

    Possible places where named args for integral literals may be used (e.g. func(x, /*named_arg=*/0) in C++, and func(x, named_arg=0) in Python):

    • LookupHost(m_host, 256, true) in src/bitcoin-cli.cpp
    • Lookup(i->first, i->second, false) in src/httpserver.cpp
    • Lookup(“0.0.0.0”, 0, false).value() in src/test/httpserver_tests.cpp

    2026-02-10 11:11:15

  3. fanquake force-pushed on Jan 26, 2026
  4. DrahtBot added the label CI failed on Jan 26, 2026
  5. pinheadmz commented at 4:05 pm on January 26, 2026: member
    nit: Pull request description should be replaced by the lyrics of Taylor Swift’s “We Are Never Ever Getting Back Together” before merging.
  6. fanquake force-pushed on Jan 28, 2026
  7. fanquake force-pushed on Feb 2, 2026
  8. fanquake force-pushed on Feb 3, 2026
  9. fanquake force-pushed on Feb 9, 2026
  10. http: enclose libevent-dependent code in a namespace
    This commit is a no-op to isolate HTTP methods and objects that
    depend on libevent. Following commits will add replacement objects
    and methods in a new namespace for testing and review before
    switching over the server.
    083d837e1f
  11. http: Implement HTTPHeaders class
    see:
    https://www.rfc-editor.org/rfc/rfc2616#section-4.2
    https://www.rfc-editor.org/rfc/rfc7231#section-5
    https://www.rfc-editor.org/rfc/rfc7231#section-7
    https://httpwg.org/specs/rfc9111.html#header.field.definitions
    fcf828c40d
  12. http: Implement HTTPResponse class
    HTTP Response message:
    https://datatracker.ietf.org/doc/html/rfc1945#section-6
    
    Status line (first line of response):
    https://datatracker.ietf.org/doc/html/rfc1945#section-6.1
    
    Status code definitions:
    https://datatracker.ietf.org/doc/html/rfc1945#section-9
    
    This commit also moves StringToBuffer to test/util/str
    since it is now used in more than one test.
    006baab3af
  13. http: Implement HTTPRequest class
    HTTP Request message:
    https://datatracker.ietf.org/doc/html/rfc1945#section-5
    
    Request Line aka Control Line aka first line:
    https://datatracker.ietf.org/doc/html/rfc1945#section-5.1
    
    See message_read_status() in libevent http.c for how
    `MORE_DATA_EXPECTED` is handled there
    cbb3544a81
  14. http: Introduce HTTPServer class and implement binding to listening socket
    Introduce a new low-level socket managing class `HTTPServer`.
    
    BindAndStartListening() was copied from CConnMan's BindListenPort()
    in net.cpp and modernized.
    
    Unit-test it with a new class `SocketTestingSetup` which mocks
    `CreateSock()` and will enable mock client I/O in future commits.
    
    Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
    990ded02e5
  15. HTTPServer: implement and test AcceptConnection()
    AcceptConnection() is mostly copied from CConmann in net.cpp
    and then modernized.
    
    Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
    8c8bff010e
  16. HTTPServer: generate sequential Ids for each newly accepted connection
    Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
    e02b2be95c
  17. http: Introduce HTTPClient class ca040ee5f4
  18. HTTPServer: start an I/O loop in a new thread and accept connections
    Socket handling methods are copied from CConnMan:
    
    `CConnman::GenerateWaitSockets()`
    `CConnman::SocketHandlerListening()`
    `CConnman::ThreadSocketHandler()` and `CConnman::SocketHandler()` are combined into ThreadSocketHandler()`.
    
    Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
    2319814c29
  19. HTTPServer: read requests from connected clients
    `SocketHandlerConnected()` adapted from CConnman
    
    Testing this requires adding a new feature to the SocketTestingSetup,
    inserting a "request" payload into the mock client that connects
    to us.
    
    Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
    389b77a691
  20. HTTPserver: support "chunked" Transfer-Encoding c8047d4129
  21. HTTPServer: compose and send replies to connected clients
    Sockets-touching bits copied and adapted from `CConnman::SocketSendData()`
    
    Testing this requires adding a new feature to the SocketTestingSetup,
    returning the DynSock I/O pipes from the mock socket so the received
    data can be checked.
    
    Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
    92a7175415
  22. HTTPServer: disconnect clients 48adc0d6f5
  23. Allow http workers to send data optimistically as an optimization 229637c00b
  24. HTTPServer: use a queue to pipeline requests from each connected client
    See https://www.rfc-editor.org/rfc/rfc7230#section-6.3.2
    
    > A server MAY process a sequence of pipelined requests in
      parallel if they all have safe methods (Section 4.2.1 of [RFC7231]),
      but it MUST send the corresponding responses in the same order that
      the requests were received.
    
    We choose NOT to process requests in parallel. They are executed in
    the order recevied as well as responded to in the order received.
    This prevents race conditions where old state may get sent in response
    to requests that are very quick to process but were requested later on
    in the queue.
    7e84a226b6
  25. define HTTP request methods at module level outside of class
    This is a refactor to prepare for matching the API of HTTPRequest
    definitions in both namespaces http_bitcoin and http_libevent. In
    particular, to provide a consistent return type for GetRequestMethod()
    in both classes.
    3b36868c8c
  26. Add helper methods to HTTPRequest to match original API
    These methods are called by http_request_cb() and are present in the
    original http_libevent::HTTPRequest.
    d6219a8e68
  27. refactor: split http_request_cb into libevent callback and dispatch
    The original function is passed to libevent as a callback when HTTP
    requests are received and processed. It wrapped the libevent request
    object in a http_libevent::HTTPRequest and then handed that off to
    bitcoin for basic checks and finally dispatch to worker threads.
    
    In this commit we split the function after the
    http_libevent::HTTPRequest is created, and pass that object to a new
    function that maintains the logic of checking and dispatching.
    
    This will be the merge point for http_libevent and http_bitcoin,
    where HTTPRequest objects from either namespace have the same
    downstream lifecycle.
    7ffbf1e52c
  28. refactor: split HTTPBindAddresses into config parse and libevent setup
    The original function was already naturally split into two chunks:
    First, we parse and validate the users' RPC configuration for IPs and
    ports. Next we bind libevent's http server to the appropriate
    endpoints.
    
    This commit splits these chunks into two separate functions, leaving
    the argument parsing in the common space of the module and moving the
    libevent-specific binding into the http_libevent namespace.
    
    A future commit will implement http_bitcoin::HTTPBindAddresses to
    bind the validate list of endpoints by the new HTTP server.
    3795db4f7a
  29. HTTPServer: implement control methods to match legacy API aa2e99db51
  30. HTTPServer: disconnect after idle timeout (-rpcservertimeout) a542792881
  31. http: switch servers from libevent to bitcoin cfddee35f6
  32. fuzz: switch http_libevent::HTTPRequest to http_bitcoin::HTTPRequest a92d6cfc6f
  33. http: delete libevent! 7c4c7df1f2
  34. common: Add unused UrlEncode function bd4a5090ae
  35. http: Add HTTPHeader file in common
    This will be shared between the http server and the bitcoin-cli http client code.
    b08764fe24
  36. cli: Remove libevent usage
    Replace libevent-based HTTP client with a simple synchronous implementation using the Sock class directly.
    b51d67a46a
  37. refactor: Use constexpr in torcontrol where possible 27bcebd8b7
  38. refactor: Modernize member variable names in torcontrol 1e50d7a084
  39. refactor: Get rid of unnecessary newlines in logs eed5d8f5f4
  40. torcontrol: Remove libevent usage
    Replace libevent-based approach with using the Sock class and CThreadInterrupt.
    641c52334e
  41. fuzz: Improve torcontrol fuzz test
    Gets rid of the Dummy class and adds coverage of get_socks_cb.
    cf965cee65
  42. test: Add simple functional test for torcontrol aa82277159
  43. test: Add test for partial message handling in torcontrol e4755e5770
  44. test: remove raii_event_tests 14354fde42
  45. cmake: remove libevent 066fea31b3
  46. depends: remove libevent f22ef20b7d
  47. ci: remove libevent 8cb75ada13
  48. vcpkg: remove libevent fe104410c0
  49. doc: remove libevent 97b242c6b8
  50. fanquake force-pushed on Feb 10, 2026
  51. DrahtBot added the label Needs rebase on Feb 11, 2026
  52. DrahtBot commented at 6:01 pm on February 11, 2026: contributor
    🐙 This pull request conflicts with the target branch and needs rebase.

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