chore(nns): Deleted set_initial_voting_power_economics. (#3778)

Because it was a one time use code, and it has been released already.

This is the denouement of [PR 2580].

[PR 2580]: #2580

rs/nns/governance/canister/canister.rs

@@ -20,7 +20,6 @@ use ic_nns_common::{
 };
 use ic_nns_constants::LEDGER_CANISTER_ID;
 use ic_nns_governance::{
-    data_migration::set_initial_voting_power_economics,
     decoder_config, encode_metrics,
     governance::{Environment, Governance, HeapGrowthPotential, RngError, TimeWarp as GovTimeWarp},
     is_prune_following_enabled,
@@ -503,8 +502,7 @@ fn canister_init_(init_payload: ApiGovernanceProto) {
 
     schedule_timers();
 
-    let mut governance_proto = InternalGovernanceProto::from(init_payload);
-    set_initial_voting_power_economics(&mut governance_proto);
+    let governance_proto = InternalGovernanceProto::from(init_payload);
     set_governance(Governance::new(
         governance_proto,
         Box::new(CanisterEnv::new()),
@@ -527,7 +525,7 @@ fn canister_pre_upgrade() {
 fn canister_post_upgrade() {
     println!("{}Executing post upgrade", LOG_PREFIX);
 
-    let mut restored_state = with_upgrades_memory(|memory| {
+    let restored_state = with_upgrades_memory(|memory| {
         let result: Result<InternalGovernanceProto, _> = load_protobuf(memory);
         result
     })
@@ -536,9 +534,6 @@ fn canister_post_upgrade() {
              CANISTER MIGHT HAVE BROKEN STATE!!!!.",
     );
 
-    // TODO(NNS1-3446): This can be deleted after it has been released.
-    set_initial_voting_power_economics(&mut restored_state);
-
     grow_upgrades_memory_to(WASM_PAGES_RESERVED_FOR_UPGRADES_MEMORY);
 
     println!(

rs/nns/governance/src/data_migration.rs

@@ -8,69 +8,6 @@
 //! initial value, but thereafter, it can be changed as the result of requests
 //! (e.g. create a proposal followed by many votes in favor).
 
-use crate::{
-    governance::LOG_PREFIX,
-    pb::v1::{Governance, VotingPowerEconomics},
-};
-
 #[path = "data_migration_tests.rs"]
 #[cfg(test)]
 mod tests;
-
-/// This ensures that the fields in voting_power_economics are set.
-///
-/// If they already have Some value, the existing values are left alone.
-///
-/// Whereas, if values are missing (or voting_power_economics itself is None),
-/// they get set according to DEFAULT_VOTING_POWER_ECONOMICS.
-///
-/// What we expect in production is that when governance is upgraded,
-/// voting_power_economics will default to None, and during post_ugprade, this
-/// gets called, causing voting_power_economics to be set to
-/// DEFAULT_VOTING_POWER_ECONOMICS.
-///
-/// In testing, when a new governance canister is created,
-/// voting_power_economics gets set in init, which also calls this.
-pub fn set_initial_voting_power_economics(governance: &mut Governance) {
-    let economics = governance.economics.as_mut();
-
-    let Some(economics) = economics else {
-        println!("{}ERROR: No NetworkEconomics!", LOG_PREFIX);
-        return;
-    };
-
-    let voting_power_economics = economics.voting_power_economics.as_mut();
-    let default = VotingPowerEconomics::with_default_values();
-
-    let Some(voting_power_economics) = voting_power_economics else {
-        println!("{}Setting voting_power_economics to default.", LOG_PREFIX);
-        economics.voting_power_economics = Some(default);
-        return;
-    };
-
-    let VotingPowerEconomics {
-        start_reducing_voting_power_after_seconds,
-        clear_following_after_seconds,
-    } = voting_power_economics;
-
-    if start_reducing_voting_power_after_seconds.is_none() {
-        println!(
-            "{}WARNING: voting_power_economics was set, but not its \
-             start_reducing_voting_power_after_seconds field. This is weird. \
-             Nevertheless, setting the field to the default.",
-            LOG_PREFIX,
-        );
-        *start_reducing_voting_power_after_seconds =
-            default.start_reducing_voting_power_after_seconds;
-    }
-
-    if clear_following_after_seconds.is_none() {
-        println!(
-            "{}WARNING: voting_power_economics was set, but not its \
-             clear_following_after_seconds field. This is weird. \
-             Nevertheless, setting the field to the default.",
-            LOG_PREFIX,
-        );
-        *clear_following_after_seconds = default.clear_following_after_seconds;
-    }
-}

rs/nns/governance/src/data_migration_tests.rs

@@ -1,61 +1,2 @@
+#[allow(unused)]
 use super::*;
-use crate::pb::v1::{Governance as GovernanceProto, NetworkEconomics, VotingPowerEconomics};
-use lazy_static::lazy_static;
-
-mod set_initial_voting_power_economics {
-    use super::*;
-
-    lazy_static! {
-        static ref GOVERNANCE_PROTO: GovernanceProto = GovernanceProto {
-            economics: Some(NetworkEconomics::with_default_values()),
-            ..Default::default()
-        };
-    }
-
-    #[test]
-    fn test_typical() {
-        let mut governance_proto = GOVERNANCE_PROTO.clone();
-        governance_proto
-            .economics
-            .as_mut()
-            .unwrap()
-            .voting_power_economics = None;
-
-        set_initial_voting_power_economics(&mut governance_proto);
-
-        assert_eq!(
-            governance_proto.economics.unwrap().voting_power_economics,
-            Some(VotingPowerEconomics {
-                start_reducing_voting_power_after_seconds: Some(15_778_800), // 0.5 * 365.25 days.
-                clear_following_after_seconds: Some(2_629_800),              // 1/12 * 365.25 days
-            }),
-        );
-    }
-
-    #[test]
-    fn test_weird() {
-        let mut governance_proto = GOVERNANCE_PROTO.clone();
-        {
-            let voting_power_economics = governance_proto
-                .economics
-                .as_mut()
-                .unwrap()
-                .voting_power_economics
-                .as_mut()
-                .unwrap();
-
-            voting_power_economics.start_reducing_voting_power_after_seconds = Some(42);
-            voting_power_economics.clear_following_after_seconds = None;
-        }
-
-        set_initial_voting_power_economics(&mut governance_proto);
-
-        assert_eq!(
-            governance_proto.economics.unwrap().voting_power_economics,
-            Some(VotingPowerEconomics {
-                start_reducing_voting_power_after_seconds: Some(42), // Do not touch.
-                clear_following_after_seconds: Some(2_629_800),      // 1/12 * 365.25 days
-            }),
-        );
-    }
-} // mod set_initial_voting_power_economics