dcrd v2.0.2

This is a patch release of dcrd which includes the following key changes:

• Nodes now prefer to maintain at least one mixing-capable outbound connection
• Peers will no longer potentially be improperly banned due to missing mix messages
• Mixing messages that are not available will now be obtained from elsewhere
• Improves mixing message availability during network propagation

Changelog

This patch release consists of 26 commits from 3 contributors which total to 18 files changed, 468 additional lines of code, and 451 deleted lines of code.

All commits since the last release may be viewed on GitHub here.

Protocol and network:

• [release-v2.0] server: Add missing ban reason (decred/dcrd#3352)
• [release-v2.0] server: Prefer min one mix capable outbound peer (decred/dcrd#3352)

Mixing message relay (mix pool):

• [release-v2.0] mixpool: Only ban full nodes for bad UTXO sigs (decred/dcrd#3351)
• [release-v2.0] mixing: Create new sessions over incrementing runs (decred/dcrd#3351)
• [release-v2.0] netsync: Handle notfound mix messages (decred/dcrd#3352)
• [release-v2.0] netsync: Remove spent PRs from prev block txs (decred/dcrd#3352)

Developer-related package and module changes:

• [release-v2.0] peer,server: Hash mix messages ASAP (decred/dcrd#3350)
• [release-v2.0] peer: Add mix message summary strings (decred/dcrd#3350)
• [release-v2.0] mixpool: Debug log all removed messages (decred/dcrd#3351)
• [release-v2.0] mixclient: Unexport ErrExpired (decred/dcrd#3351)
• [release-v2.0] mixclient: Log identities of blamed peers (decred/dcrd#3351)
• [release-v2.0] mixclient: Avoid overwriting prev PRs slice (decred/dcrd#3351)
• [release-v2.0] mixclient: Log reasons for blaming during run (decred/dcrd#3351)
• [release-v2.0] mixpool: Debug log accepted messages (decred/dcrd#3351)
• [release-v2.0] mixpool: Log correct accepted orphans (decred/dcrd#3351)
• [release-v2.0] mixpool: Remove unused entry run field (decred/dcrd#3351)
• [release-v2.0] mixpool: Remove unused exported methods (decred/dcrd#3351)
• [release-v2.0] mixclient: Respect standard tx size limits (decred/dcrd#3351)
• [release-v2.0] mixclient: Fix build (decred/dcrd#3351)
• [release-v2.0] mixpool: Don't alloc error on unknown msg (decred/dcrd#3351)
• [release-v2.0] dcrd: Switch getdata log from trace to debug (decred/dcrd#3352)
• [release-v2.0] server: Remove dup min protocol version check (decred/dcrd#3352)
• [release-v2.0] mempool: Return missing prev outpoints (decred/dcrd#3352)

Developer-related module management:

• [release-v2.0] main: Use backported peer updates (decred/dcrd#3350)
• [release-v2.0] main: Use backported mixing updates (decred/dcrd#3351)

Misc:

• [release-v2.0] release: Bump for 2.0.2 (decred/dcrd#3353)

Code Contributors (alphabetical order):

• Dave Collins
• David Hill
• Josh Rickmar