Many times, a node will start up only to shut down immediately.
In these cases, reproviding is costly to both the node, and the
rest of the network. Also note: the probability of a node being
up another minute increases with uptime.
TODO: maybe this should be 5 * time.Minute
Before, the engine worker would pop a task and block on send to the
bitswap worker even if the bitswap worker wasn't to receive. Since the
task could have been invalidated during this blocking send, a small
number of stale (already acquired) blocks would be send to partners.
Now, tasks are only popped off of the queue when bitswap is ready to
send them over the wire. This is accomplished by removing the
outboxChanBuffer and implementing a two-phase communication sequence.
refactor: peerRequestQueue
it's a mistake to make one queue to fit all. Go's lack of algebraic
types turns a generalized queue into a monstrosity of type
checking/casting. Better to have individual queues for individual
purposes.
Conflicts:
exchange/bitswap/decision/bench_test.go
exchange/bitswap/decision/tasks/task_queue.go
fix(bitswap.decision.PRQ): if peers match, always return result of pri comparison
fix(bitswap.decision.Engine): push to the queue before notifying
TOCTOU bug
1. client notifies
2. worker checks (finds nil)
3. worker sleeps
3. client pushes (worker missed the update)
test(PQ): improve documentation and add test
test(bitswap.decision.Engine): handling received messages
License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
I think it's time to move a lot of the peer-to-peer networking
but-not-ipfs-specific things into its own package: p2p.
This could in the future be split off into its own library.
The first thing to go is the peer.
@whyrusleeping @jbenet this is a WIP with the DHT.
wip
License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
Conflicts:
epictest/addcat_test.go
exchange/bitswap/testnet/peernet.go
exchange/bitswap/testutils.go
routing/mock/centralized_server.go
routing/mock/centralized_test.go
routing/mock/interface.go
fix(routing/mock) fill in function definition
