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MigrationFactoryOwner

The source code of the MigrationFactoryOwner.vy contract can be found on GitHub. The contract is written with Vyper version 0.4.3.

Overview​

MigrationFactoryOwner is a slimmer predecessor of HybridFactoryOwner — same admin-proxy pattern, fewer features. It owns its FACTORY and forwards governance calls, but it lacks the limit_setters allowlist and the lt_distribute_borrower_fees surface. It still exists on-chain because LTMigrator reads two of its views to gate migrations.

The bulk of this contract is governance plumbing for the DAO that operates the migration-era Factory. Integrators only care about two public views.

What integrators read​

@external
@view
def lt_in_factory(lt: address) -> bool

Returns True if STABLECOIN.allowance(FACTORY, lt) > 0 — a stand-in check for "this LT has been deployed by FACTORY and was given crvUSD spend permission." LTMigrator calls this against both lt_from and lt_to before routing a migration; integrators should do the same before treating an LT address as a valid YB market under this Factory.

disabled_lts: public(HashMap[LT, bool])

Map keyed by LT address. True means admin disabled that market (via lt_allocate_stablecoins(lt, 0)). LTMigrator refuses to migrate INTO any LT where this flag is set ("lt_to deprecated").

@view accessor signature: disabled_lts(lt: address) -> bool.

Governance surface (admin-only)​

For completeness — none of these are intended for non-admin callers. Each requires msg.sender == ADMIN.

FunctionForwards to / effect
transfer_ownership_back()FACTORY.set_admin(ADMIN, emergency_admin)
lt_set_rate(lt, rate)LT.set_rate
lt_set_amm_rate(lt, fee)LT.set_amm_fee (note the function name differs from the LT method)
lt_set_killed(lt, is_killed)LT.set_killed
lt_allocate_stablecoins(lt, limit)Admin-only when limit > 0 (no limit_setters allowlist here); permissionless when limit == 0 and disabled_lts[lt] == True, same 75% safe floor as HybridFactoryOwner.
lt_needs_withdraw(lt)View: shares that need to be withdrawn for available_limit to match stablecoin_allocated.
add_market(...)FACTORY.add_market
set_fee_receiver(addr)FACTORY.set_fee_receiver
set_implementations(...)FACTORY.set_implementations
set_min_admin_fee(value)FACTORY.set_min_admin_fee

This contract does not expose lt_distribute_borrower_fees, set_allocator, set_agg, set_flash, fill_staker_vpool, or set_limit_setter. For those, use HybridFactoryOwner.