Module hardfork 

Tempo-specific hardfork definitions and traits.

This module provides the infrastructure for managing hardfork transitions in Tempo.

Adding a New Hardfork

When a new hardfork is needed (e.g., Vivace):

In hardfork.rs:

1. Append a Vivace variant to tempo_hardfork! — automatically:
   • defines the enum variant via [hardfork!]
   • implements trait TempoHardforks by adding is_vivace(), is_vivace_active_at_timestamp(), and updating tempo_hardfork_at()
   • adds tests for each of the TempoHardfork methods
2. Update From<TempoHardfork> for SpecId if the hardfork requires a different Ethereum SpecId

In spec.rs:

3. Add vivace_time: Option<u64> field to TempoGenesisInfo
4. Add TempoHardfork::Vivace => self.vivace_time arm to TempoGenesisInfo::fork_time()

In genesis files and generator:

5. Add "vivaceTime": 0 to genesis/dev.json
6. Add vivace_time: Option<u64> arg to xtask/src/genesis_args.rs
7. Add insertion of "vivaceTime" to chain_config.extra_fields

Macros

tempo_hardfork 🔒

Single-source hardfork definition macro. Append a new variant and everything else is generated:

Enums

TempoHardfork

Tempo-specific hardforks for network upgrades.

Traits

TempoHardforks

Trait for querying Tempo-specific hardfork activations.