Section RaftLinearizableProofs.
Context {orig_base_params : BaseParams}.
Context {one_node_params : OneNodeParams orig_base_params}.
Context {raft_params : RaftParams orig_base_params}.
Context {oiai : output_implies_applied_interface}.
Context {aiii : applied_implies_input_interface}.
Context {copi : causal_order_preserved_interface}.
Context {iboi : input_before_output_interface}.
Context {oci : output_correct_interface}.
Context {ogii : output_greatest_id_interface}.
Definition op_eq_dec : forall x y : op key, {x = y} + {x <> y}.
Proof using.
decide equality; auto using key_eq_dec.
Qed.
Fixpoint import (tr : list (name * (raft_input + list raft_output)))
: list (op key) :=
match tr with
| [] => []
| (_, (inl (ClientRequest c id cmd))) :: xs =>
I (c, id) :: remove op_eq_dec (I (c, id)) (import xs)
| (_, (inr l)) :: xs =>
let os := dedup op_eq_dec
(filterMap (fun x =>
match x with
| ClientResponse c id cmd => Some (O (c, id))
| _ => None
end) l)
in os ++ remove_all op_eq_dec os (import xs)
| _ :: xs => import xs
end.
Inductive exported (env_i : key -> option input) (env_o : key -> option output) :
list (IR key) -> list (input * output) -> Prop :=
| exported_nil : exported env_i env_o nil nil
| exported_IO : forall k i o l tr,
env_i k = Some i ->
env_o k = Some o ->
exported env_i env_o l tr ->
exported env_i env_o (IRI k :: IRO k :: l) ((i, o) :: tr)
| exported_IU : forall k i o l tr,
env_i k = Some i ->
exported env_i env_o l tr ->
exported env_i env_o (IRI k :: IRU k :: l) ((i, o) :: tr).
Fixpoint get_input (tr : list (name * (raft_input + list raft_output))) (k : key)
: option input :=
match tr with
| [] => None
| (_, (inl (ClientRequest c id cmd))) :: xs =>
if (sumbool_and _ _ _ _
(clientId_eq_dec c (fst k))
(eq_nat_dec id (snd k))) then
Some cmd
else
get_input xs k
| _ :: xs => get_input xs k
end.
Fixpoint get_output' (os : list raft_output) (k : key) : option output :=
match os with
| [] => None
| ClientResponse c id o :: xs =>
if (sumbool_and _ _ _ _
(clientId_eq_dec c (fst k))
(eq_nat_dec id (snd k))) then
Some o
else
get_output' xs k
| _ :: xs => get_output' xs k
end.
Fixpoint get_output (tr : list (name * (raft_input + list raft_output))) (k : key)
: option output :=
match tr with
| [] => None
| (_, (inr os)) :: xs => (match get_output' os k with
| Some o => Some o
| None => get_output xs k
end)
| _ :: xs => get_output xs k
end.
Proof using.
unfold has_key.
intros.
destruct e.
simpl.
break_if; repeat (do_bool; intuition).
Qed.
Proof using.
intros. subst. apply has_key_intro.
Qed.
Proof using.
unfold has_key.
intros.
destruct e'.
simpl in *.
do_bool. right. do_bool. auto.
Qed.
Proof using.
unfold has_key.
intros.
destruct e'.
simpl in *.
do_bool. left. break_if; congruence.
Qed.
Proof using.
induction l; simpl.
- intuition.
- intros. repeat break_match; intuition; subst; simpl in *; intuition eauto.
+ do_bool. destruct (clientId_eq_dec (eClient e) (eClient a)).
* assert (eId a <= eId e).
{ repeat find_rewrite. auto using has_key_intro.
}
{ find_apply_lem_hyp le_lt_or_eq. break_or_hyp.
- specialize (IHl _ ltac:(eauto)).
match goal with
| [ |- context [deduplicate_log' _ ?ks] ] =>
specialize (IHl ks)
end.
forward IHl.
{ intuition.
repeat find_rewrite. rewrite get_set_same in *. find_injection. auto.
}
concludes.
forward IHl.
{ intuition auto using has_key_different_id_false with *. }
concludes.
break_exists_exists. intuition.
- eauto.
}
* specialize (IHl _ ltac:(eauto)).
match goal with
| [ |- context [deduplicate_log' _ ?ks] ] =>
specialize (IHl ks)
end.
forward IHl.
{ intuition.
repeat find_rewrite. rewrite get_set_diff in * by auto. auto.
}
concludes.
forward IHl.
{ intuition auto using has_key_different_client_false with *. }
concludes.
break_exists_exists. intuition.
+ do_bool. assert (n < eId e) by auto. lia.
+ do_bool. apply IHl; auto.
intros.
destruct (clientId_eq_dec (eClient e) (eClient a)).
* assert (eId e <> eId a).
{ intro. repeat find_rewrite.
assert (n < eId a) by auto. lia.
}
intuition auto using has_key_different_id_false with *.
* intuition auto using has_key_different_client_false with *.
+ destruct (clientId_eq_dec (eClient e) (eClient a)).
* assert (eId a <= eId e).
{ repeat find_rewrite. auto using has_key_intro.
}
{ find_apply_lem_hyp le_lt_or_eq. break_or_hyp.
- specialize (IHl _ ltac:(eauto)).
match goal with
| [ |- context [deduplicate_log' _ ?ks] ] =>
specialize (IHl ks)
end.
forward IHl.
{ intuition.
repeat find_rewrite. rewrite get_set_same in *. find_injection. auto.
}
concludes.
forward IHl.
{ intuition auto using has_key_different_id_false with *. }
concludes.
break_exists_exists. intuition.
- eauto.
}
* specialize (IHl _ ltac:(eauto)).
match goal with
| [ |- context [deduplicate_log' _ ?ks] ] =>
specialize (IHl ks)
end.
forward IHl.
{ intuition.
repeat find_rewrite. rewrite get_set_diff in * by auto. auto.
}
concludes.
forward IHl.
{ intuition auto using has_key_different_client_false with *. }
concludes.
break_exists_exists. intuition.
Qed.
Proof using.
unfold deduplicate_log'.
intros.
eapply deduplicate_log'_In with (ks := []) in H; simpl; intuition; try discriminate.
Qed.
Proof using.
eauto using deduplicate_log'_In_if.
Qed.
Fixpoint log_to_IR (env_o : key -> option output) (log : list entry) {struct log} : list (IR key) :=
match log with
| [] => []
| mkEntry h client id index term input :: log' =>
(match env_o (client, id) with
| None => [IRI (client, id); IRU (client, id)]
| Some _ => [IRI (client, id); IRO (client, id)]
end) ++ log_to_IR env_o log'
end.
Proof using.
intros.
induction log; simpl in *; auto.
- repeat break_match; simpl in *; constructor; auto.
Qed.
Proof using.
induction tr; intros; simpl in *; intuition.
repeat break_match; subst; intuition.
- find_apply_hyp_hyp. break_exists_exists.
intuition.
- simpl in *. intuition; try congruence.
find_apply_lem_hyp in_remove.
find_apply_hyp_hyp. break_exists_exists.
intuition.
- do_in_app. intuition.
+ find_apply_lem_hyp in_dedup_was_in.
find_apply_lem_hyp In_filterMap.
break_exists. intuition.
break_match; try congruence.
find_inversion.
repeat eexists; intuition eauto.
+ find_apply_lem_hyp in_remove_all_was_in.
find_apply_hyp_hyp. break_exists_exists.
intuition.
Qed.

Lemma in_import_in_trace_I :
forall tr k,
In (I k) (import tr) ->
exists h i,
In (h, inl (ClientRequest (fst k) (snd k) i)) tr.