d5028942e4
BREAKING CHANGE:
1. Call values in the trace have CID references to structures that have call arguments' hash and CID references to values and tetraplets.
2. If call value is unused, it is serialized with `Unused` variant, and CID references are not stored.
Previous data scheme was (Scalar as an example, other cases are similar):
```
Scalar(CID<JValue>) ---<value_store>----> JValue
```
New data scheme is much more sophisticated:
```
Scalar(CID<ServiceResultAggregate>) ---+
|
+----<service_result_store>----------+
|
+-------> ServiceResultAggregate:
value_cid ------------<value_store>----> JValue
tetraplet_cid --------<tetraplet_store>----> SecurityTetraplet
argument_hash: String
```
`Stream` variant is similar, however, `Unused` is different: it has value CID only, but the value is not stored into the `value_store`:
```
Unused(Rc<CID<JValue>>) ---> X
```
Co-authored-by: Mike Voronov <michail.vms@gmail.com>
AIR trace handler
This crate contains implementation of the CRDT-based merging data algorithm. It exposes the TraceHandler struct that based on the visitor pattern and has public methods that should be called in certain places of AIR instructions execution. Internally TraceHandler contains several FSM and each of such public methods does state transitioning of one or more these FSMs. Below are state transition sequences for all instructions that caller must follow.
Ap instruction
Expected sequence of TraceHandler calls for the ap instruction:
meet_ap_start
-> meet_ap_end
Call instruction
Expected sequence of TraceHandler calls for the call instruction:
meet_call_start
-> meet_call_end
Par instruction
Expected sequence of TraceHandler calls for the par instruction:
meet_par_start
-> meet_par_subgraph_end(..., SubgraphType::Left)
-> meet_par_subgraph_end(..., SubgraphType::Right)
Fold instruction
Expected sequence of TraceHandler calls for the fold instruction:
meet_fold_start.1 ->
meet_generation_start.N ->
meet_next.M ->
meet_prev.M ->
meet_generation_end.N ->
meet_fold_end.1
where .T means that this function should be called exactly T times.