Implement blockstore manager which executes block storage operations on its block stores, in the order to which they were added to the manager, typically in the order of most local (fastest, eg cache) to least local (slowest, eg filesystem or perhaps a network filesystem). As an example, given a `BlockStoreManager` instantiated with a `@[MemoryStore, FSStore]`, retrieving a block would first attempt to get from the `MemoryStore`, and if not found, attempt to get from the `FSStore`.
Remove all dependencies on `BlockStores` (typically in the shape of `localstore`) and instead depend on `BlockStoreManager` via the `BlockExcEngine`.
Modify the role of the `BlockExcEngine` to make a “local vs remote” decision on block access/storage. For all operations other than retrieving blocks, this means simply going to the `BlockStoreManager`. For retrieving blocks, however, this means going first to the `BlockStoreManager`, and then if not found, going to the Dagger network (via pending block and want/have lists).
Remove `NetworkStore` as its two purposes were to defer block retrieval from a local store first, then go to the block exchange to requeest a block from the Dagger network. `BlockStoreManager` takes care of going to local storage first, and the block exchange engine handles going to Dagger network if retrieval from the store manager fails.
### Notes
1. Future work may want to consider breaking up `BlockExcEngine` further in to three modules:
- `BlockExcEngine` (depends on `WantHave`, `DHT`)
- `WantHave`
- `DHT` (work is in progress)
Co-authored-by: Michael Bradley <michaelsbradleyjr@gmail.com>
* fix compilation issues with latest libp2p
* change package description
* fix CI compiler
* try with nim 1.4.2
* try with 1.4.2
* use more standardized ci config
* set reasonable log level
* remove nim version dependency
* reverting to 1.4.6 as otherwise it fails on amd64
* use PeerInfo in event handlers
* use CidV1 and raw multicodec as default
* add block stream abstraction
* raises defect
* adding dataset abstraction
* move blockstream into own dir
* reorg files and fix tests
* rename dataset to blockset
* wip
* wip
* adding basic test for treehash algo
* run blockset tests along with with the rest
* remove obsolete contents
* fix chunker tests
* rename bitswap and move to stores
* rename bitwsap to blockexc and move to stores
* moare project structure reorg
* moving protobuf into bitswap
* adding block type
* reworking bitswap
* adding chunker
* adding license header
* use 1.2.6
* adding fixed size chunker
* add blockstore
* add iterator to chunker
* more bitswap changes
* rename ipfs to dagger
* rename to dagger
* blockstore inherits from BlockProvider
* wip - add core block handling logic
* smal changes
* use proper block store methods
* adding asynq heapqueue
* wip prepare for bitswap task runner
* adding `$`
* adding memory store and tests
* fixed chunking
* extracted desicion engine from bitswap
* added helper random funcs
* adding testing helpers
* only handle seqs
* add peer events
* cleanup pending blocks on blockstore event
* allow nil handlers
* move protobuf type helpers
* allow initializing block from Cid
* testing and fixes
* small fixes
* expose `<`
* spelling
* default value
* spelling
* pending blocks manager
* adding stores manager
* more tests a wip around bitswap
* small changes
* merge bitswap and engine for now
* for now run only the new poc's tests
* add a more complete ci setup
* use template in map
* remove p2pd
* remove go
* dont use asyncCheck
* few small changes
* adding ability to update items
* adding multiple task runners
* handle cancelation properly
* use Result instead of throwing
* wip bitswap tests
* moving things around
* split out engine again
* add request and handlers interface
* fix tests
* wip - engine tests
* remove unused imports
* fix tests
* cleanup block requesting logic
* add block request tests
* more block requests
* add support for max heap
* don't use result
* use max heap & send block presence in task handler
* add task handler tests
* rename store to localStore
* cleanup & logging
* cancel task on stop
* don't depend on local store for events
* dont use heap queue for wants
* add chronicles
* fix issue with peer wants
* add test for delayed block sends
* remove obsolete tests
* wip chunker
* run all tests
* add todo
* misc
* remove irrelevant files
* removing more files
* adding helpers for bitswap tests
* moved bitswap file
* misc
* make blocks timeout longer
* adjust block timeout
* speedup test
* compile with threads
* import missing crypto
* misc
* disable threads for now
* fix 32 bit platforms
* re-enable threads support in tests
