* Hide `Rc` inside `CID` type, making it cheap to clone.
* Introduce `CidRef` type that abstracts on `CID`'s inner type.
This change makes code cleaner, makes memory more optimal (single allocation vs two allocations) and makes it easier to change CID's internal representation from string to binary.
If `canon` is to be executed on another peer and the particle is to be
sent here, current peer inserts canon request-sent-by state to avoid
repeated requests, similar to `call` instruction.
* `ValueAggregate` refactoring
0. Service results, canon results and literals are constructed as
separate types that are further wrapped with `ValueAggregate`.
1. `ValueAggregate` is enum that contains all the provenance info.
2. Construction methods get provenance information as well.
* Rename CID state field
Prepare to adding a canon CID field: rename `canon_tracker`/`canon_store`
to `canon_element_tracker`/`canon_element_store`.
* Add canon result store/tracker
* Rename some structs that have CIDs inside
Reflect explicitly that they contain CIDs inside:
`CanonResultAggregate` -> `CanonResultCidAggregate`
`ServiceResultAggregate` -> `ServiceResultCidAggregate`
---------
Co-authored-by: Mike Voronov <michail.vms@gmail.com>
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>
* Use CID values for tetraplets and `canon` vectors.
* Rename `cid_store` to `value_store`
It is consistent with the new `tetraplet_store` and `canon_store`
fields.
* Make canon data more typeful
The `CanonResult` doesn't take a JSON value anymore that is further
deserialized elsewhere, but is a struct that has all data deserialized.
* Typeful `CID` type
The `CID` type has a phantom type paramter defining its value's type.
* Group cid stores and trackers
Group cid stores into `CidInfo` struct, and trackers into `ExecutionCidState` struct.
At the moment `Ap` state contains vector of generations, although the ap instruction itself allow to specify only one stream. It was done to support several streams in a result position in a future. But the current realization allows to handle empty vector that was implemented to support states for scalars and it turned out (for more info see #326) that states for scalars aren't actually needed.
Closes#355.
Many internal structures refer to trace positions; this is an important type of values. In the code, it is sometimes `u32`, sometimes `usize`. While such variables usually have "_pos" suffix, having a dedicated type does improve code with type guarantees.
