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223: Arc-ify the Ipfs struct r=koivunej a=ljedrz
This allows us to pass the central `Ipfs` object around when needed, improving what we can do within its child objects. In addition:
- `impl Default for Bitswap` (now possible)
- replace `Arc<Repo>` with a reference to `Ipfs` in `IpldDag` and `Ipns`, which are now created on-the-fly when needed
- poll for `BitswapEvent`s using `NetworkBehaviourEventProcess`
- un`Arc` the `Repo`
Co-authored-by: ljedrz <ljedrz@gmail.com>
221: remove Strategy, improve event handling r=koivunej a=ljedrz
The scope of changes is far greater than I've anticipated, but bear with me.
Key, planned changes:
- remove `bitswap::strategy`
- move `bitswap::Stats` to `ledger`
- introduce `BitswapEvents` emitted by `Bitswap::poll`
- move `Message` into `Ledger`
Drive-by changes forced by current design:
- wrap `Stats` in an `Arc`, make individual stats `AtomicU64`
- add a `Bitswap.queued_blocks` collection populated from `IpfsFuture::poll`
- make some child `bitswap` objects `pub` or `pub(crate)`
- update `Stats` from `IpfsFuture::poll` (good causality-wise, bad encapsulation-wise)
- introduce a `Bitswap.io_events` sender and its `IpfsFuture.bitswap_events` counterpart receiver
Observations:
- `Repo` is something we want to have access to both in `bitswap` (in order to find `want`ed `Block`s) and in `Ipfs` (to handle the higher-level API requests)
- `Ledger`s for the different `PeerId`s contain `Stats` that are updated at `IpfsFuture` level
- `BitswapEvents` don't currently result in anything of interest, due to `Behaviour` not containing the `Repo`
Key takeaway: we need to do some re-designing in order for key objects to have better access to one another.
Co-authored-by: ljedrz <ljedrz@gmail.com>
218: remove the Strategy generic & replace libipld with cid in bitswap r=koivunej a=ljedrz
- we only support a single strategy and the fact it is a generic complicates things; make it non-generic, which paves way to improving event handling
- `cid` is a smaller dep than `libipld` and we only use its bits in `bitswap`
Co-authored-by: ljedrz <ljedrz@gmail.com>
