Previously we only allow downloading of old blocks if the peer
difficulty was greater than our syncing difficulty. This change allows
downloading of blocks from peers where the difficulty is greater then
the last downloaded old block.
* Insert PROOF messages for some cases in blockchain
* Break expect to its own line to avoid things being too long
* Be more specific for all low-level database error cases
* Fix BranchBecomingCanonChain expect
* ethcore: fix typo in expect proof message
* Added --tx-queue-no-early-reject flag to disable early tx queue rejects because of low gas price
* Fixed failing tests, clarified comments and simplified no_early_reject field name.
* Added test case for the --tx-queue-no-early-reject flag
* parity: fix UserDefaults json parser
* parity: use serde_derive for UserDefaults
* parity: support deserialization of old UserDefault json format
* parity: make UserDefaults serde backwards compatible
* parity: tabify indentation in UserDefaults
* Reject if Engine::on_close_block returns error
* Unify open block behaviors
* Fix tests in ethcore
* Fix Aura tests
* Fix RPC test
* Print a warning if open block failed
* Print the actual error when closing the block
* Update comments for prepare_pending_block
* Add BlockPreparationStatus to distingish three different state after prepare_pending_block
* Insert Kovan hardcoded headers until #7690241
* Insert Kovan hardcoded headers until block 7690241
* Insert Ropsten hardcoded headers until #3612673
* Insert Mainnet hardcoded headers until block 5941249
* Revert "Replace `std::env::home_dir` with `dirs::home_dir` (#9077)"
This reverts commit 7e779327eb.
* Restore some of the changes
* Update parity-common
* discovery: Only add nodes to routing table after receiving pong.
Previously the discovery algorithm would add nodes to the routing table
before confirming that the endpoint is participating in the protocol. This
now tracks in-flight pings and adds to the routing table only after receiving
a response.
* discovery: Refactor packet creation into its own function.
This function is useful inside unit tests.
* discovery: Additional testing for new add_node behavior.
* discovery: Track expiration of pings to non-yet-in-bucket nodes.
Now that we may ping nodes before adding to a k-bucket, the timeout tracking
must be separate from BucketEntry.
* discovery: Verify echo hash on pong packets.
Stores packet hash with in-flight requests and matches with pong response.
* discovery: Track timeouts on FIND_NODE requests.
* discovery: Retry failed pings with exponential backoff.
UDP packets may get dropped, so instead of immediately booting nodes that fail
to respond to a ping, retry 4 times with exponential backoff.
* !fixup Use slice instead of Vec for request_backoff.
