The reserve's current bToken supply index (b_rate, SCALAR_12 scale),
read live from Blend via get_reserve.
This is a live read, not a settled one: get_reserve runs Reserve::load,
which accrues from data.last_time to the current ledger timestamp before
returning (early-returning only when the reserve was already accrued this
ledger). So the index advances continuously on a quiet reserve, and a
pin_index at a term boundary captures that boundary's true index —
no interaction has to land nearby. The Alula adapter reaches the same
property by projecting forward itself, because its source settles on read;
here the pool already does it.
b_rate does legitimately hold flat while utilization == 0 — nothing is
borrowed, so suppliers earn nothing. That is a real zero rate, not staleness.
fn index(env: soroban_sdk::Env) -> i128The bound configuration (pool / asset).
fn config(env: soroban_sdk::Env) -> ConfigReplace the contract's wasm (admin-gated). Address and storage are kept.
fn upgrade(env: soroban_sdk::Env, new_wasm_hash: soroban_sdk::BytesN<32>)fn get_admin(env: soroban_sdk::Env) -> soroban_sdk::AddressHand the admin role to new_admin (current admin only).
upgrade is admin-gated and this contract has no other way to move that role, so without
this the deploying key kept un-timelocked code-replacement authority over it forever — the
governance handover could rotate the engine, vAMM and broker but not this.
fn set_admin(env: soroban_sdk::Env, new_admin: soroban_sdk::Address)Storage/schema version, bumped by a post-upgrade migration when the layout changes.
fn get_version(env: soroban_sdk::Env) -> u32Bind this adapter to one reserve (asset) of one Blend pool, admin-gated for upgrades.
fn __constructor(
env: soroban_sdk::Env,
admin: soroban_sdk::Address,
pool: soroban_sdk::Address,
asset: soroban_sdk::Address,
)