This is now "FVM" native. Changes include:
1. Don't treat "trace" messages like off-chain messages. E.g., don't
include CIDs, versions, etc.
2. Include IPLD codecs where applicable.
3. Remove fields that aren't filled by the FVM (timing, some errors,
code locations, etc.).
- Event keys are now t1, t2, t3, t4 for topics; and d for data.
- ref-fvm no longer stores events in the blockstore for us. It just
returns events to the client, who is now responsible for handling
them as it wishes / according to its configuration.
- Add a flag to VMOpts to have the events AMT be written in the blockstore.
- Add a flag to the ChainStore to advertise to the rest of the system
if the ChainStore is storing events.
- Enable that flag if the EthRPC is enabled (can also add an explicit
configuration flag if wanted).
* feat: add support for generating tipset CIDs
(cherry-picked from feat/nv18-fevm)
* feat: fvm: add support for looking up past tipset CIDs
We do this by adding yet another "getter" to the VM that resolves an
epoch into a TipSetKey.
Co-authored-by: Kevin Li <ychiaoli18@users.noreply.github.com>
This also ignores the VM "Flush" option and instead, flushes
unconditionally (in the FVM):
1. In the FVM, we don't read blocks on flush (ever).
2. All _uses_ of TVX use a "proxy" blockstore that buffers writes, so
nothing should actually get flushed to lotus.
The next FVM version will only support nv15+.
This change also disables the FVM before nv15, even if enabled through
the environment variable. This allows "catching up" from before nv15.
While over-estimation fees and miner tips are still paid, gas is no longer burnt
for direct, successful window PoSt messages.
Usually, gas is burnt to prevent an attacker from spamming the network and to
allow clients to "price" messages (using the base fee cap) based on how urgently
they need them to be processed. However:
1. Window PoSt is already a "proof of work".
2. Miners need to submit WindowedPoSts on-time so all window post messages are urgent.
3. Work is already under way to move window post verification off-chain (making
it effectively free). This change simply introduces the "free" part a bit earlier.
