From: Daira Hopwood Date: Sat, 17 Nov 2012 00:32:24 +0000 (+0000) Subject: Changes to specification of add_lease and renew_lease in RIStorageServer. X-Git-Url: https://git.rkrishnan.org/provisioning?a=commitdiff_plain;h=94b2e9e595ecff9704d81587f41b515d2c4901ee;p=tahoe-lafs%2Ftahoe-lafs.git Changes to specification of add_lease and renew_lease in RIStorageServer. Signed-off-by: David-Sarah Hopwood --- diff --git a/src/allmydata/interfaces.py b/src/allmydata/interfaces.py index e495c759..77e3d8a6 100644 --- a/src/allmydata/interfaces.py +++ b/src/allmydata/interfaces.py @@ -27,8 +27,8 @@ Number = IntegerConstraint(8) # 2**(8*8) == 16EiB ~= 18e18 ~= 18 exabytes Offset = Number ReadSize = int # the 'int' constraint is 2**31 == 2Gib -- large files are processed in not-so-large increments WriteEnablerSecret = Hash # used to protect mutable share modifications -LeaseRenewSecret = Hash # used to protect lease renewal requests -LeaseCancelSecret = Hash # was used to protect lease cancellation requests +LeaseRenewSecret = Hash # previously used to protect lease renewal requests; for backward compatibility +LeaseCancelSecret = Hash # previously used to protect lease cancellation requests; for backward compatibility class RIBucketWriter(RemoteInterface): @@ -124,33 +124,51 @@ class RIStorageServer(RemoteInterface): renew_secret=LeaseRenewSecret, cancel_secret=LeaseCancelSecret): """ - Add a new lease on the given bucket. If the renew_secret matches an - existing lease, that lease will be renewed instead. If there is no - bucket for the given storage_index, return silently. (note that in - tahoe-1.3.0 and earlier, IndexError was raised if there was no - bucket) + Add or renew a lease for this account on every share with the given + storage index held by the server. If there are no shares held by the + server with the given storage_index, return silently. (In Tahoe-LAFS + v1.3.0 and earlier, IndexError was raised in that case.) + + The duration of leases is set to 31 days (unless there is already a + longer lease), but expiration behaviour also depends on the server's + configured policy (see docs/garbage-collection.rst). + + renew_secret and cancel_secret are ignored as of Tahoe-LAFS v1.11.0, + but for backward compatibility with older servers, should be + calculated in the same way as previous clients (see + allmydata.util.hashutil.file_{renewal,cancel}_secret_hash). """ - return Any() # returns None now, but future versions might change + return Any() # always None def renew_lease(storage_index=StorageIndex, renew_secret=LeaseRenewSecret): """ - Renew the lease on a given bucket, resetting the timer to 31 days. - Some networks will use this, some will not. If there is no bucket for - the given storage_index, IndexError will be raised. + Add or renew a lease for this account on every share with the given + storage index held by the server. If there are no shares held by the + server with the given storage_index, raise IndexError. + + The duration of leases is set to 31 days (unless there is already a + longer lease), but expiration behaviour also depends on the server's + configured policy (see docs/garbage-collection.rst). + + renew_secret is ignored as of Tahoe-LAFS v1.11.0, but for backward + compatibility with older servers, should be calculated in the same + way as previous clients (see + allmydata.util.hashutil.file_renewal_secret_hash). In versions + prior to v1.X.0, this method would only renew leases with the given + renew_secret. - For mutable shares, if the given renew_secret does not match an - existing lease, IndexError will be raised with a note listing the - server-nodeids on the existing leases, so leases on migrated shares - can be renewed. For immutable shares, IndexError (without the note) - will be raised. + Note that as of Tahoe-LAFS v1.11.0, the lease database does not retain + information about the node ids of lease holders, so if an IndexError + is raised for a mutable share, it no longer includes that information. """ - return Any() + return Any() # always None + + # XXX add a method that allows adding/renewing leases on only some shnums. + # See ticket #1816. def get_buckets(storage_index=StorageIndex): return DictOf(int, RIBucketReader, maxKeys=MAX_BUCKETS) - - def slot_readv(storage_index=StorageIndex, shares=ListOf(int), readv=ReadVector): """Read a vector from the numbered shares associated with the given