292 lines
11 KiB
Markdown
292 lines
11 KiB
Markdown
# RPC
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## Client
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Client is provided as a Go package, so please refer to the
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[relevant godocs page](https://godoc.org/github.com/nspcc-dev/neo-go/pkg/rpc).
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## Server
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The server is written to support as much of the [JSON-RPC 2.0 Spec](http://www.jsonrpc.org/specification) as possible. The server is run as part of the node currently.
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### Example call
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An example would be viewing the version of the node:
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```bash
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$ curl -X POST -d '{"jsonrpc": "2.0", "method": "getversion", "params": [], "id": 1}' http://localhost:20332
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```
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which would yield the response:
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```json
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{
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"result" : {
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"useragent" : "/NEO-GO:0.97.2/",
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"tcpport" : 10333,
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"network" : 860833102,
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"nonce" : 105745208
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},
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"jsonrpc" : "2.0",
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"id" : 1
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}
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```
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### Supported methods
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| Method |
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| ------- |
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| `calculatenetworkfee` |
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| `findstates` |
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| `getapplicationlog` |
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| `getbestblockhash` |
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| `getblock` |
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| `getblockcount` |
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| `getblockhash` |
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| `getblockheader` |
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| `getblockheadercount` |
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| `getcandidates` |
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| `getcommittee` |
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| `getconnectioncount` |
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| `getcontractstate` |
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| `getnativecontracts` |
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| `getnep11balances` |
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| `getnep11properties` |
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| `getnep11transfers` |
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| `getnep17balances` |
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| `getnep17transfers` |
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| `getnextblockvalidators` |
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| `getpeers` |
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| `getproof` |
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| `getrawmempool` |
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| `getrawtransaction` |
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| `getstate` |
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| `getstateheight` |
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| `getstateroot` |
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| `getstorage` |
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| `gettransactionheight` |
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| `getunclaimedgas` |
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| `getversion` |
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| `invokecontractverify` |
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| `invokefunction` |
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| `invokescript` |
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| `sendrawtransaction` |
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| `submitblock` |
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| `submitoracleresponse` |
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| `terminatesession` |
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| `traverseiterator` |
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| `validateaddress` |
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| `verifyproof` |
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#### Implementation notices
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##### JSON representation of enumerations
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C# implementation contains a number of enumerations and while it outputs them
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into JSON as comma-separated strings (or just strings if only one value is
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allowed for this type) it accepts pure numbers for input (see #2563 for
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example). NeoGo currently doesn't support this behavior. This affects the
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following data types:
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* transaction attribute type
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* oracle response code
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* transaction witness scope
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* rule witness action
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* condition rule witness type
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* function call flag
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* function call parameter type
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* execution trigger type
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* stack item type
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Any call that takes any of these types for input in JSON format is affected.
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##### `calculatenetworkfee`
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NeoGo tries to cover more cases with its calculatenetworkfee implementation,
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whereas C# node support only standard signature contracts and deployed
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contracts that can execute `verify` successfully on incomplete (not yet signed
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properly) transaction, NeoGo also works with deployed contracts that fail at
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this stage and executes non-standard contracts (that can fail
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too). It's ignoring the result of any verification script (since the method
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calculates fee and doesn't care about transaction validity). Invocation script
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is used as is when provided, but absent it the system will try to infer one
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based on the `verify` method signature (pushing dummy signatures or
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hashes). If signature has some types which contents can't be adequately
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guessed (arrays, maps, interop, void) they're ignored. See
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neo-project/neo#2805 as well.
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##### `invokefunction`, `invokescript`
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neo-go implementation of `invokefunction` does not return `tx`
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field in the answer because that requires signing the transaction with some
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key in the server, which doesn't fit the model of our node-client interactions.
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If this signature is lacking, the transaction is almost useless, so there is no point
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in returning it.
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It's possible to use `invokefunction` not only with a contract scripthash, but also
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with a contract name (for native contracts) or a contract ID (for all contracts). This
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feature is not supported by the C# node.
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If iterator is present on stack after function or script invocation then, depending
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on `SessionEnable` RPC-server setting, iterator either will be marshalled as iterator
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ID (corresponds to `SessionEnabled: true`) or as a set of traversed iterator values
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up to `DefaultMaxIteratorResultItems` packed into array (corresponds to
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`SessionEnabled: false`).
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##### `getcontractstate`
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It's possible to get non-native contract state by its ID, unlike with C# node where
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it only works for native contracts.
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##### `getrawtransaction`
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VM state is included into verbose response along with other transaction fields if
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the transaction is already on chain.
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##### `getstateroot`
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This method is able to accept state root hash instead of index, unlike the C# node
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where only index is accepted.
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##### `getstorage`
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This method doesn't work for the Ledger contract, you can get data via regular
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`getblock` and `getrawtransaction` calls. This method is able to get storage of
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a native contract by its name (case-insensitive), unlike the C# node where
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it only possible for index or hash.
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##### `getnep11balances` and `getnep17balances`
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neo-go implementation of `getnep11balances` and `getnep17balances` does not
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perform tracking of NEP-11 and NEP-17 balances for each account as it is done
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in the C# node. Instead, a neo-go node maintains a list of standard-compliant
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contracts, i.e. those contracts that have `NEP-11` or `NEP-17` declared in the
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supported standards section of the manifest. Each time balances are queried,
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the neo-go node asks every NEP-11/NEP-17 contract for the account balance by
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invoking `balanceOf` method with the corresponding args. Invocation GAS limit
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is set to be 3 GAS. All non-zero balances are included in the RPC call result.
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Thus, if a token contract doesn't have proper standard declared in the list of
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supported standards but emits compliant NEP-11/NEP-17 `Transfer`
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notifications, the token balance won't be shown in the list of balances
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returned by the neo-go node (unlike the C# node behavior). However, transfer
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logs of such tokens are still available via respective `getnepXXtransfers` RPC
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calls.
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The behavior of the `LastUpdatedBlock` tracking for archival nodes as far as for
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governing token balances matches the C# node's one. For non-archival nodes and
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other NEP-11/NEP-17 tokens, if transfer's `LastUpdatedBlock` is lower than the
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latest state synchronization point P the node working against,
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`LastUpdatedBlock` equals P. For NEP-11 NFTs `LastUpdatedBlock` is equal for
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all tokens of the same asset.
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##### `getversion`
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NeoGo can return additional fields in the `protocol` object depending on the
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extensions enabled. Specifically that's `p2psigextensions` and
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`staterootinheader` booleans and `committeehistory` and `validatorshistory`
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objects (that are effectively maps from stringified integers to other
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integers. These fields are only returned when corresponding settings are
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enabled in the server's protocol configuration.
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##### `getnep11transfers` and `getnep17transfers`
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`transfernotifyindex` is not tracked by NeoGo, thus this field is always zero.
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### Unsupported methods
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Methods listed below are not going to be supported for various reasons
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and we're not accepting issues related to them.
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| Method | Reason |
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| `closewallet` | Doesn't fit neo-go wallet model |
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| `dumpprivkey` | Shouldn't exist for security reasons, see `closewallet` comment also |
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| `getnewaddress` | See `closewallet` comment, use CLI to do that |
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| `getwalletbalance` | See `closewallet` comment, use `getnep17balances` for that |
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| `getwalletunclaimedgas` | See `closewallet` comment, use `getunclaimedgas` for that |
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| `importprivkey` | Not applicable to neo-go, see `closewallet` comment |
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| `listaddress` | Not applicable to neo-go, see `closewallet` comment |
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| `listplugins` | neo-go doesn't have any plugins, so it makes no sense |
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| `openwallet` | Doesn't fit neo-go wallet model |
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| `sendfrom` | Not applicable to neo-go, see `openwallet` comment |
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| `sendmany` | Not applicable to neo-go, see `openwallet` comment |
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| `sendtoaddress` | Not applicable to neo-go, see `claimgas` comment |
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### Extensions
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Some additional extensions are implemented as a part of this RPC server.
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#### `getblocksysfee` call
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This method returns cumulative system fee for all transactions included in a
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block. It can be removed in future versions, but at the moment you can use it
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to see how much GAS is burned with a particular block (because system fees are
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burned).
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#### `invokecontractverifyhistoric`, `invokefunctionhistoric` and `invokescripthistoric` calls
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These methods provide the ability of *historical* calls and accept block hash or
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block index or stateroot hash as the first parameter and the list of parameters
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that is the same as of `invokecontractverify`, `invokefunction` and
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`invokescript` correspondingly. The historical call assumes that the contracts'
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storage state has all its values got from MPT with the specified stateroot (or,
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which is the same, with the stateroot of the block of the specified height) and
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the transaction will be invoked using interop context with block which is next to
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the block with the specified height. This allows to perform test invocation using
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the specified past chain state. These methods may be useful for debugging
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purposes.
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Behavior note: any historical RPC call need the historical chain state to be
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presented in the node storage, thus if the node keeps only latest MPT state
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the historical call can not be handled properly.The historical calls only
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guaranteed to correctly work on archival node that stores all MPT data. If a
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node keeps the number of latest states and has the GC on (this setting
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corresponds to the `RemoveUntraceableBlocks` set to `true`), then the behaviour
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of historical RPC call is undefined. GC can always kick some data out of the
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storage while the historical call is executing, thus keep in mind that the call
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can be processed with `RemoveUntraceableBlocks` only with limitations on
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available data.
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#### `submitnotaryrequest` call
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This method can be used on P2P Notary enabled networks to submit new notary
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payloads to be relayed from RPC to P2P.
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#### Limits and paging for getnep11transfers and getnep17transfers
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`getnep11transfers` and `getnep17transfers` RPC calls never return more than
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1000 results for one request (within the specified time frame). You can pass your
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own limit via an additional parameter and then use paging to request the next
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batch of transfers.
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An example of requesting 10 events for address NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc
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within 0-1600094189000 timestamps:
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```json
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{ "jsonrpc": "2.0", "id": 5, "method": "getnep17transfers", "params":
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["NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc", 0, 1600094189000, 10] }
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```
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Get the next 10 transfers for the same account within the same time frame:
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```json
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{ "jsonrpc": "2.0", "id": 5, "method": "getnep17transfers", "params":
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["NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc", 0, 1600094189000, 10, 1] }
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```
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#### Websocket server
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This server accepts websocket connections on `ws://$BASE_URL/ws` address. You
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can use it to perform regular RPC calls over websockets (it's supposed to be a
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little faster than going regular HTTP route) and you can also use it for
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additional functionality provided only via websockets (like notifications).
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#### Notification subsystem
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Notification subsystem consists of two additional RPC methods (`subscribe` and
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`unsubscribe` working only over websocket connection) that allow to subscribe
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to various blockchain events (with simple event filtering) and receive them on
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the client as JSON-RPC notifications. More details on that are written in the
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[notifications specification](notifications.md).
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## Reference
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* [JSON-RPC 2.0 Specification](http://www.jsonrpc.org/specification)
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* [NEO JSON-RPC 2.0 docs](https://docs.neo.org/docs/en-us/reference/rpc/latest-version/api.html)
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