[Bug debuginfod/28661] New: support thread-pool model

[Bug debuginfod/28661] New: support thread-pool model

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28661

            Bug ID: 28661
           Summary: support thread-pool model
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: debuginfod
          Assignee: unassigned at sourceware dot org
          Reporter: fche at redhat dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Switch to libmicrohttpd thread-pooling for the webapi service threads, from the
general unrestricted THREAD_PER_CONNECTION model, at least as a default.  A
libmicrohttpd bug can create a persistent DoS condition from a transient one,
but the thread-pool method should avoid that particular trigger.

https://lists.gnu.org/archive/html/libmicrohttpd/2021-12/msg00011.html

https://git.gnunet.org/libmicrohttpd.git/commit/?id=8cdc89b9c3652d5ed899305bc93b10ddf04dbebc

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[Bug debuginfod/28661] support thread-pool model

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28661

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
commit 80ea3cf32

    PR28661: debuginfo connection thread pool support

    Add an option -C, which activates libmicrohttpd's thread-pool mode for
    handling incoming http connections.  Add libmicrohttpd error-logging
    callback function so as to receive indication of its internal errors,
    and relay counts to our metrics.  Some of these internal errors tipped
    us off to a microhttpd bug that thread pooling works around.  Document
    in debuginfod.8 page.  Hand-tested against "ulimit -u NNN" shells, and
    with a less strenuous new test case.

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