feat:Add more helper

Signed-off-by: Chen Kai <281165273grape@gmail.com>

Author: GrapeBaBa

src/consensus/helpers/validator.zig

@@ -11,6 +11,7 @@ const epoch_helper = @import("../../consensus/helpers/epoch.zig");
 const shuffle_helper = @import("../../consensus/helpers/shuffle.zig");
 const balance_helper = @import("../../consensus/helpers/balance.zig");
 const committee_helper = @import("../../consensus/helpers/committee.zig");
+const finality_helper = @import("../../consensus/helpers/finality.zig");
 
 /// Check if a validator is active at a given epoch.
 /// A validator is active if the current epoch is greater than or equal to the validator's activation epoch and less than the validator's exit epoch.
@@ -555,6 +556,44 @@ pub fn getEligibleValidatorIndices(state: *consensus.BeaconState, allocator: std
     return eligible.toOwnedSlice();
 }
 
+pub fn processInactivityUpdates(state: *consensus.BeaconState, allocator: std.mem.Allocator) !void {
+    // Skip the genesis epoch as score updates are based on the previous epoch participation
+    if (epoch_helper.getCurrentEpoch(state) == constants.GENESIS_EPOCH) {
+        return;
+    }
+
+    const participating_indices = try getUnslashedParticipatingIndices(state, constants.TIMELY_TARGET_FLAG_INDEX, epoch_helper.getPreviousEpoch(state), allocator);
+    defer allocator.free(participating_indices);
+
+    const eligible_indices = try getEligibleValidatorIndices(state, allocator);
+    defer allocator.free(eligible_indices);
+
+    for (eligible_indices) |index| {
+        // Increase the inactivity score of inactive validators
+        if (std.mem.containsAtLeast(primitives.ValidatorIndex, participating_indices, 1, &[_]primitives.ValidatorIndex{index})) {
+            state.inactivityScores()[index] -= @min(1, state.inactivityScores()[index]);
+        } else {
+            state.inactivityScores()[index] += configs.ActiveConfig.get().INACTIVITY_SCORE_BIAS;
+        }
+        // Decrease the inactivity score of all eligible validators during a leak-free epoch
+        if (!finality_helper.isInInactivityLeak(state)) {
+            state.inactivityScores()[index] -= @min(configs.ActiveConfig.get().INACTIVITY_SCORE_RECOVERY_RATE, state.inactivityScores()[index]);
+        }
+    }
+}
+
+pub fn getBaseReward(state: *const consensus.BeaconState, index: primitives.ValidatorIndex, allocator: std.mem.Allocator) !primitives.Gwei {
+    const increments = state.validators()[index].effective_balance / preset.ActivePreset.get().EFFECTIVE_BALANCE_INCREMENT;
+    const base_reward_per_increment = try getBaseRewardPerIncrement(state, allocator);
+    return increments * base_reward_per_increment;
+}
+
+pub fn getBaseRewardPerIncrement(state: *const consensus.BeaconState, allocator: std.mem.Allocator) !primitives.Gwei {
+    const total_balance = try balance_helper.getTotalActiveBalance(state, allocator);
+    const sqrt_balance = std.math.sqrt(total_balance);
+    return @as(primitives.Gwei, @divFloor(preset.ActivePreset.get().EFFECTIVE_BALANCE_INCREMENT * preset.ActivePreset.get().BASE_REWARD_FACTOR, sqrt_balance));
+}
+
 test "test getBalanceChurnLimit" {
     preset.ActivePreset.set(preset.Presets.minimal);
     defer preset.ActivePreset.reset();

src/primitives/utils.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const constants = @import("constants.zig");
 const testing = std.testing;
 
 pub fn ceilLog2(x: usize) u64 {
@@ -15,6 +16,19 @@ pub fn floorLog2(x: usize) u64 {
     return @as(u64, @bitSizeOf(u64) - @clz(x) - 1);
 }
 
+pub fn integerSquareroot(n: u64) u64 {
+    if (n == std.math.maxInt(u64)) {
+        return constants.UINT64_MAX_SQRT; // UINT64_MAX_SQRT
+    }
+    var x = n;
+    var y = (x + 1) / 2;
+    while (y < x) {
+        x = y;
+        y = (x + n / x) / 2;
+    }
+    return x;
+}
+
 test "ceilLog2 with valid inputs" {
     try testing.expectEqual(@as(u64, 0), ceilLog2(1));
     try testing.expectEqual(@as(u64, 1), ceilLog2(2));