Since key refresh is prone to failure, retry using exponential backoff with random jitter. This adds the following sync-openpgp-* configuration settings:
sync-openpgp-key-refresh-retry-count = 40 Maximum number of times to retry key refresh if it fails. Between each key refresh attempt, there is an exponential delay with a constant multiplier and a uniform random multiplier between 0 and 1. sync-openpgp-key-refresh-retry-delay-exp-base = 2 The base of the exponential expression. The exponent is the number of previous refresh attempts. sync-openpgp-key-refresh-retry-delay-max = 60 Maximum delay between each retry attempt, in units of seconds. This places a limit on the length of the exponential delay. sync-openpgp-key-refresh-retry-delay-mult = 4 Multiplier for the exponential delay. sync-openpgp-key-refresh-retry-overall-timeout = 1200 Combined time limit for all refresh attempts, in units of seconds. Bug: https://bugs.gentoo.org/649276 Zac Medico (4): Add ForkExecutor (bug 649588) Add ExponentialBackoff and RandomExponentialBackoff Add retry decorator (API inspired by tenacity) rsync: add key refresh retry (bug 649276) cnf/repos.conf | 5 + man/portage.5 | 19 +++ pym/portage/repository/config.py | 22 ++++ pym/portage/sync/modules/rsync/rsync.py | 16 ++- pym/portage/sync/syncbase.py | 85 +++++++++++- pym/portage/tests/util/futures/test_retry.py | 147 +++++++++++++++++++++ pym/portage/util/_eventloop/EventLoop.py | 45 ++++++- pym/portage/util/backoff.py | 48 +++++++ pym/portage/util/futures/executor/__init__.py | 0 pym/portage/util/futures/executor/fork.py | 130 +++++++++++++++++++ pym/portage/util/futures/futures.py | 6 + pym/portage/util/futures/retry.py | 178 ++++++++++++++++++++++++++ 12 files changed, 697 insertions(+), 4 deletions(-) create mode 100644 pym/portage/tests/util/futures/test_retry.py create mode 100644 pym/portage/util/backoff.py create mode 100644 pym/portage/util/futures/executor/__init__.py create mode 100644 pym/portage/util/futures/executor/fork.py create mode 100644 pym/portage/util/futures/retry.py -- 2.13.6
