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docs: refactor historical RPC calls documentation

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1. Reorder paragraphs.
2. Extend common historical calls description.
2. Document `getstoragehistoric` and `findstoragehistoric` extensions.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
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Anna Shaleva 2023-08-22 19:46:07 +03:00
parent 1fb0c96e2c
commit c7d5ee0898
1 changed files with 34 additions and 11 deletions
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docs/rpc.md
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@ -37,6 +37,7 @@ which would yield the response:
| ------- |
| `calculatenetworkfee` |
| `findstates` |
| `findstorage` |
| `getapplicationlog` |
| `getbestblockhash` |
| `getblock` |
@ -237,7 +238,30 @@ block. It can be removed in future versions, but at the moment you can use it
to see how much GAS is burned with a particular block (because system fees are
burned).
#### `invokecontractverifyhistoric`, `invokefunctionhistoric` and `invokescripthistoric` calls
#### Historic calls
A set of `*historic` extension methods provide the ability of interacting with
*historical* chain state including invoking contract methods, running scripts and
retrieving contract storage items. It means that the contracts' storage state has
all its values got from MPT with the specified stateroot from past (or, which is
the same, with the stateroot of the block of the specified height). All
operations related to the contract storage will be performed using this past
contracts' storage state and using interop context (if required by the RPC
handler) with a block which is next to the block with the specified height.
Any historical RPC call needs the historical chain state to be presented in the
node storage, thus if the node keeps only latest MPT state the historical call
can not be handled properly and
[neorpc.ErrUnsupportedState](https://github.com/nspcc-dev/neo-go/blob/87e4b6beaafa3c180184cbbe88ba143378c5024c/pkg/neorpc/errors.go#L134)
is returned in this case. The historical calls only guaranteed to correctly work
on archival node that stores all MPT data. If a node keeps the number of latest
states and has the GC on (this setting corresponds to the
`RemoveUntraceableBlocks` set to `true`), then the behaviour of historical RPC
call is undefined. GC can always kick some data out of the storage while the
historical call is executing, thus keep in mind that the call can be processed
with `RemoveUntraceableBlocks` only with limitations on available data.
##### `invokecontractverifyhistoric`, `invokefunctionhistoric` and `invokescripthistoric` calls
These methods provide the ability of *historical* calls and accept block hash or
block index or stateroot hash as the first parameter and the list of parameters
@ -250,16 +274,15 @@ the block with the specified height. This allows to perform test invocation usin
the specified past chain state. These methods may be useful for debugging
purposes.
Behavior note: any historical RPC call need the historical chain state to be
presented in the node storage, thus if the node keeps only latest MPT state
the historical call can not be handled properly.The historical calls only
guaranteed to correctly work on archival node that stores all MPT data. If a
node keeps the number of latest states and has the GC on (this setting
corresponds to the `RemoveUntraceableBlocks` set to `true`), then the behaviour
of historical RPC call is undefined. GC can always kick some data out of the
storage while the historical call is executing, thus keep in mind that the call
can be processed with `RemoveUntraceableBlocks` only with limitations on
available data.
##### `getstoragehistoric` and `findstoragehistoric` calls
These methods provide the ability of retrieving *historical* contract storage
items and accept stateroot hash as the first parameter and the list of parameters
that is the same as of `getstorage` and `findstorage` correspondingly. The
historical storage items retrieval process assume that the contracts' storage
state has all its values got from MPT with the specified stateroot. This allows
to track the contract storage scheme using the specified past chain state. These
methods may be useful for debugging purposes.
#### `submitnotaryrequest` call