rpc/chainHead: Fix pruned blocks events from forks (paritytech#13379)

* rpc/chainhead: Test unpin for noncanonical prunned blocks

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/tests: Ensure fork is not reported by the Finalized event

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chainhead: Detect pruned forks to ignore from events

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/tests: Check unpin can be called on pruned hashes

Signed-off-by: Alexandru Vasile <[email protected]>

* Fix clippy

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Handle race with memory blocks and notifications

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Add data config for the `follow` future

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Address feedback

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Move best block cache on the data config

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Send new events from the finalized stream

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chian_head: Report all pruned blocks

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Move `chainHead_follow` logic on dedicated file

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Delegate follow logic to `chain_head_follow`

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Remove subscriptions on drop

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/tests: Ignore pruned blocks for a longer fork

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/tests: Check all pruned blocks are reported, not just stale heads

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/tests: Remove println debug and fix indentation

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Remove unnecessary trait bounds

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Add debug log for pruned forks

Signed-off-by: Alexandru Vasile <[email protected]>

* Revert "rpc/chain_head: Add debug log for pruned forks"

This reverts commit 425d6e7.

* Adjust blockID for testing

Signed-off-by: Alexandru Vasile <[email protected]>

* Update client/rpc-spec-v2/src/chain_head/chain_head_follow.rs

Co-authored-by: Davide Galassi <[email protected]>

* rpc/chain_head: Rename `ChainHeadFollow` to `ChainHeadFollower`

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Remove subscriptions manually

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Improve log messages by adding subID and errors

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Ensure `follow` stops sending events on first error

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Use default constructor

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Add `StartupPoint` structure

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Rename `in_memory_blocks`

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Fix comment typo

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Keep unique blocks and remove itertools

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Make sure `bestBlocks` events are generated in order

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Maintain order of reported blocks

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Parent of finalized block could be unpinned

Signed-off-by: Alexandru Vasile <[email protected]>

* rpc/chain_head: Fix warning

Signed-off-by: Alexandru Vasile <[email protected]>

---------

Signed-off-by: Alexandru Vasile <[email protected]>
Co-authored-by: Davide Galassi <[email protected]>