[libvirt] [PATCH v3 00/13] Implement keepalive protocol for libvirt RPC

[Jiri Denemark]

This patchset can also be found at

    https://gitorious.org/~jirka/libvirt/jirka-staging/commits/keepalive

This allows us to detect broken connections between server and client without
waiting for TCP timeout and dead deamon/client. By default a connection is
considered broken after about 30 seconds of no messages received from remote
party. After that period, the connection is automatically closed.

The main reason for implementing this is that peer-to-peer migration can now be
canceled when a connection between source and target breaks. Although this will
really work only after qemu fixes migrate_cancel command so that it doesn't
block when outgoing TCP buffers are full.

Version 3 addresses comments from Daniel (more details can be found in each
patch) except for the default settings on server side. Daniel suggested
keepalive should be switched off by default, while I think it should be on if
possible, but that (and if on, with what interval and count) can be discussed
further since it has negligible impact on the patchset.

Jiri Denemark (13):
  Define keepalive protocol
  Implement common keepalive handling
  Introduce virConnectSetKeepAlive
  virsh: Always run event loop
  Implement keepalive protocol in libvirt daemon
  Add support for non-blocking calls in client RPC
  Add support for async close of client RPC socket
  Implement keepalive protocol in remote driver
  Introduce virConnectIsAlive API
  Implement virConnectIsAlive in all drivers
  Add keepalive support into domain-events examples
  qemu: Add support for keepalive messages during p2p migration
  qemu: Cancel p2p migration when connection breaks

 .gitignore                                         |    1 +
 daemon/libvirtd.aug                                |    5 +
 daemon/libvirtd.c                                  |   15 +
 daemon/libvirtd.conf                               |   22 +
 daemon/libvirtd.h                                  |    1 +
 daemon/remote.c                                    |   48 +++-
 examples/domain-events/events-c/event-test.c       |    9 +-
 examples/domain-events/events-python/event-test.py |    4 +-
 include/libvirt/libvirt.h.in                       |    5 +
 po/POTFILES.in                                     |    1 +
 src/Makefile.am                                    |   15 +-
 src/driver.h                                       |    8 +
 src/esx/esx_driver.c                               |   18 +
 src/hyperv/hyperv_driver.c                         |   18 +
 src/libvirt.c                                      |   90 ++++
 src/libvirt_internal.h                             |   10 +-
 src/libvirt_private.syms                           |    2 +
 src/libvirt_public.syms                            |    2 +
 src/libxl/libxl_driver.c                           |    8 +
 src/lxc/lxc_driver.c                               |    7 +
 src/openvz/openvz_driver.c                         |    7 +
 src/phyp/phyp_driver.c                             |   18 +
 src/qemu/libvirtd_qemu.aug                         |    2 +
 src/qemu/qemu.conf                                 |   19 +
 src/qemu/qemu_conf.c                               |   11 +
 src/qemu/qemu_conf.h                               |    3 +
 src/qemu/qemu_driver.c                             |    6 +
 src/qemu/qemu_migration.c                          |   43 ++-
 src/qemu/test_libvirtd_qemu.aug                    |    6 +
 src/remote/remote_driver.c                         |   70 ++++
 src/remote/remote_protocol.x                       |    2 +-
 src/rpc/virkeepalive.c                             |  426 ++++++++++++++++++++
 src/rpc/virkeepalive.h                             |   56 +++
 src/rpc/virkeepaliveprotocol.x                     |    7 +
 src/rpc/virnetclient.c                             |  316 +++++++++++++---
 src/rpc/virnetclient.h                             |    6 +
 src/rpc/virnetserver.c                             |   22 +
 src/rpc/virnetserver.h                             |    5 +
 src/rpc/virnetserverclient.c                       |  143 ++++++-
 src/rpc/virnetserverclient.h                       |    7 +
 src/test/test_driver.c                             |    6 +
 src/uml/uml_driver.c                               |    7 +
 src/util/event.c                                   |    6 +-
 src/vbox/vbox_tmpl.c                               |    6 +
 src/vmware/vmware_driver.c                         |    7 +
 src/xen/xen_driver.c                               |    8 +
 src/xenapi/xenapi_driver.c                         |   12 +
 tools/console.c                                    |   17 +-
 tools/virsh.c                                      |   31 ++
 49 files changed, 1477 insertions(+), 87 deletions(-)
 create mode 100644 src/rpc/virkeepalive.c
 create mode 100644 src/rpc/virkeepalive.h
 create mode 100644 src/rpc/virkeepaliveprotocol.x

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1.7.7