* Rework AsyncIter
* Add tests for finishing iter on error
* Improved error handling for and additional tests
* Use new style of constructors
* Handle future cancellation
* Docs for constructors
* setting up
* Implements timer utility
* applies async and cancellation to timer loop
* Sets up mocktimer and mockblockstore to set up first maintenance module test
* wip: first test that calls blockChecker
* wip: adding user type to timer callback
* Chronicles doesn't like type-arguments? Disables logging in timer module for now
* Implementing block check test for blockMaintainer module
* Sets up additional tests for blockmaintainer
* Removes generic from timer module. Implements numberOfBlocks per interval in blockMaintainer.
* Implements blockMaintainer
* Sets up tests for blockChecker
* Some comments by Mark
* Cleanup repostore tests
* Setting up the use of std/times for block TTL tracking
* repostore adds expiration timestamp
* Defaults the repostore clock to the system clock
* Applies updates to repostore interface.
* Implements retrieving of block expiration information from repostore
* Sets up tests for maintenance module behavior
* Implements block maintenance module
* Wires maintenance module into codex. Sets up integration tests for block expiration
* Sets up test for missing behavior: removing timestamp metadata on block delete
* Implements removing of expiration metadata in repoStore
* Fixes integration tests for block expiration
* Adds block expiration tests to integration test run
* Handled some comments by Dmitriy
* Review comment by Dmitriy: Removes seq[cid] from runBlockCheck
* Review comment by Dmitriy: Moves key formatting methods to keyutils.
* Review comment by Dmitriy: Encodes durations using chronos
* Fixes conversion of TTL type in conf.
* Review comments by Dmitriy
* Adds unit tests for keyUtils.
* Adds test coverage for exception in maintenance module
* initial implementation of repo store
* allow isManifest on multicodec
* rework with new blockstore
* add raw codec
* rework listBlocks
* remove fsstore
* reworking with repostore
* bump datastore
* fix listBlocks iterator
* adding store's common tests
* run common store tests
* remove fsstore backend tests
* bump datastore
* add `listBlocks` tests
* listBlocks filter based on block type
* disabling tests in need of rewriting
* allow passing block type
* move BlockNotFoundError definition
* fix tests
* increase default advertise loop sleep to 10 mins
* use `self`
* add cache quota functionality
* pass meta store and start repo
* add `CacheQuotaNamespace`
* pass meta store
* bump datastore to latest master
* don't use os `/` as key separator
* Added quota limits support
* tests for quota limits
* add block expiration key
* remove unnesesary space
* use idleAsync in listBlocks
* proper test name
* re-add contrlC try/except
* add storage quota and block ttl config options
* clarify comments
* change expires key format
* check for block presence before storing
* bump datastore
* use dht with fixed datastore `has`
* bump datastore to latest master
* bump dht to latest master
Tomasz Bekas
Ben Bierens
Dmitriy Ryajov
Michael Bradley, Jr