feat:Add more helper

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

Author: GrapeBaBa

src/consensus/helpers/finality.zig

@@ -0,0 +1,18 @@
+const std = @import("std");
+const primitives = @import("../../primitives/types.zig");
+const consensus = @import("../../consensus/types.zig");
+const configs = @import("../../configs/config.zig");
+const constants = @import("../../primitives/constants.zig");
+const preset = @import("../../presets/preset.zig");
+const phase0 = @import("../../consensus/phase0/types.zig");
+const altair = @import("../../consensus/altair/types.zig");
+const electra = @import("../../consensus/electra/types.zig");
+const epoch_helper = @import("../../consensus/helpers/epoch.zig");
+
+pub fn getFinalizationDelay(state: *const consensus.BeaconState) u64 {
+    return epoch_helper.getPreviousEpoch(state) - state.finalizedCheckpointEpoch();
+}
+
+pub fn isInInactivityLeak(state: *const consensus.BeaconState) bool {
+    return getFinalizationDelay(state) > preset.ActivePreset.get().MIN_EPOCHS_TO_INACTIVITY_PENALTY;
+}

src/consensus/helpers/validator.zig

@@ -539,6 +539,22 @@ pub fn getUnslashedParticipatingIndices(
     return result_slice;
 }
 
+pub fn getEligibleValidatorIndices(state: *consensus.BeaconState,allocator:std.mem.Allocator) ![]primitives.ValidatorIndex {
+    const previous_epoch = epoch_helper.getPreviousEpoch(state);
+    var eligible = std.ArrayList(primitives.ValidatorIndex).init(allocator);
+    defer eligible.deinit();
+
+    for (state.validators(), 0..) |v, index| {
+        if (isActiveValidator(&v, previous_epoch) or
+            (v.slashed and previous_epoch + 1 < v.withdrawable_epoch)) {
+            try eligible.append(@as(primitives.ValidatorIndex, index));
+        }
+    }
+
+    return eligible.toOwnedSlice();
+}
+
+
 test "test getBalanceChurnLimit" {
     preset.ActivePreset.set(preset.Presets.minimal);
     defer preset.ActivePreset.reset();

src/root.zig

@@ -30,6 +30,7 @@ pub const bls = @import("./bls/bls.zig");
 pub const deposit_helper = @import("consensus/helpers/deposit.zig");
 pub const voluntary_exit_helper = @import("consensus/helpers/voluntary_exit.zig");
 pub const justification_finalization_helper = @import("consensus/helpers/justification_finalization.zig");
+pub const finality = @import("consensus/helpers/finality.zig");
 
 test {
     @import("std").testing.refAllDeclsRecursive(@This());