* misc/mdns/service: Use async std with stack pinned futures
* misc/mdns: Define mdns broadcast address as lazy static
* misc/mdns: Drop future before borrowing their arguments again
* misc/mdns: Send queries on query socket, not socket
* misc/mdns: Use poll_next_unpin on query interval stream
* misc/mdns: Ensure underlying task is woken up on next interval tick
* misc/mdns: Wrap match expression in scope to drop future early
* misc/mdns: Adjust 'discovery_ourselves' test
* misc/mdns: Make query interval fire instantly on first tick
This is an optimization only important for short lived use cases, e.g.
unit tests. Instead of waiting for 20 seconds at first, the query
interval fires right away and thereby the service makes progress
instantly.
* misc/mdns: Adjust MdnsService documentation tests
* misc/mdns: Do not drop UDP socket send and reicv futures
Libp2p-mdns uses the async-std crate for network io. This crate only
offers async send and receive functions. In order to use this in non
async/await functions one needs to keep the future returned by the crate
functions around across `poll` invocations.
The future returned by the crate functions references the io resource.
Thus one has to keep both the io resource as well as the future
referencing it. This results in a self-referencing struct which is not
possible to create with safe Rust.
Instead, by having `MdnsService::next` (former `MdnsService::poll`) take
ownership of `self`, the Rust async magic takes care of the above (See
code comments for more details).
As a (negative) side effect, given that `MdnsService::next` takes
ownership of `self`, there is nothing to bind the lifetime of the
returned `MdnsPacket` to. With no better solution in mind, this patch
makes `MdnsPacket` static, not referencing the `MdnsService` receive
buffer.
* misc/mdns: Fix code comments and remove *if Free* TODO
* misc/mdns: Minor refactorings
* misc/mdns: Build responses in behaviour.rs directly
* misc/mdns: Move response ttl duration to constant
* misc/mdns: Remove optimization todo comment
* misc/mdns: Add query interval test
* misc/mdns: Move packet parsing into MdnPacket impl
* misc/mdns: Don't have receiving packets starve the query interval
When we 'await' on receiving a packet on the udp socket without
receiving a single packet we starve the remaining logic of the mdns
service, in this case the logic triggered on the receive interval.
* misc/mdns: Add debug_assert to MaybeBusyMdnsService check
* misc/mdns: Implement Debug for MaybeBusyMdnsService
* misc/mdns: Make ownership note a normal comment, not a doc comment
* misc/mdns: Have discovered_peers return an iterator
The functionality is available through `Multiaddr::replace`.
What we currently call "nat_traversal" is merley a replacement of an IP
address prefix in a `Multiaddr`, hence it can be done directly on
`Multiaddr` values instead of having to go through a `Transport`.
In addition this PR consolidates changes made to `Multiaddr` in
previous commits which resulted in lots of deprecations. It adds some
more (see below for the complete list of API changes) and removes all
deprecated functionality, requiring a minor version bump.
Here are the changes to `multiaddr` compared to the currently published
version:
1. Removed `into_bytes` (use `to_vec` instead).
2. Renamed `to_bytes` to `to_vec`.
3. Removed `from_bytes` (use the `TryFrom` impl instead).
4. Added `with_capacity`.
5. Added `len`.
6. Removed `as_slice` (use `AsRef` impl instead).
7. Removed `encapsulate` (use `push` or `with` instead).
8. Removed `decapsulate` (use `pop` instead).
9. Renamed `append` to `push`.
10. Added `with`.
11. Added `replace`.
12. Removed `ToMultiaddr` trait (use `TryFrom` instead).
* Embed the topology in the NetworkBehaviour
* Put topologies inside of Floodsub and Kad
* Fix core tests
* Fix chat example
* More work
* Some cleanup
* Restore external addresses system
* Move the MdnsService to a service module
* Add a Mdns behaviour
* Add a Mdns network behaviour
* Add minor documentation
* Add minor todo
* Use nat_traversal on the observed address
* Don't add self to topology
* Automatically connect to nodes we discover
* Add Debug implementations
* Fix example
