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neoneo-go/docs/rpc.md

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RPC

Client

Client is provided as a Go package, so please refer to the relevant godocs page.

Server

The server is written to support as much of the JSON-RPC 2.0 Spec as possible. The server is run as part of the node currently.

Example call

An example would be viewing the version of the node:

$ curl -X POST -d '{"jsonrpc": "2.0", "method": "getversion", "params": [], "id": 1}' http://localhost:20332

which would yield the response:

{
  "result" : {
    "useragent" : "/NEO-GO:0.97.2/",
    "tcpport" : 10333,
    "network" : 860833102,
    "nonce" : 105745208
  },
  "jsonrpc" : "2.0",
  "id" : 1
}

Supported methods

Method
calculatenetworkfee
findstates
getapplicationlog
getbestblockhash
getblock
getblockcount
getblockhash
getblockheader
getblockheadercount
getcommittee
getconnectioncount
getcontractstate
getnativecontracts
getnep11balances
getnep11properties
getnep11transfers
getnep17balances
getnep17transfers
getnextblockvalidators
getpeers
getproof
getrawmempool
getrawtransaction
getstate
getstateheight
getstateroot
getstorage
gettransactionheight
getunclaimedgas
getversion
invokecontractverify
invokefunction
invokescript
sendrawtransaction
submitblock
submitoracleresponse
validateaddress
verifyproof

Implementation notices

invokefunction

neo-go's implementation of invokefunction does not return tx field in the answer because that requires signing the transaction with some key in the server which doesn't fit the model of our node-client interactions. Lacking this signature the transaction is almost useless, so there is no point in returning it.

It's possible to use invokefunction not only with contract scripthash, but also with contract name (for native contracts) or contract ID (for all contracts). This feature is not supported by the C# node.

getcontractstate

It's possible to get non-native contract state by its ID, unlike with C# node where it only works for native contracts.

getrawtransaction

VM state is included to verbose response along with other transaction fields if the transaction is already on chain.

getstateroot

This method is able to accept state root hash instead of index, unlike the C# node where only index is accepted.

getstorage

This method doesn't work for the Ledger contract, you can get data via regular getblock and getrawtransaction calls. This method is able to get storage of the native contract by its name (case-insensitive), unlike the C# node where it only possible for index or hash.

getnep11balances and getnep17balances

neo-go's implementation of getnep11balances and getnep17balances does not perform tracking of NEP-11 and NEP-17 balances for each account as it is done in the C# node. Instead, neo-go node maintains the list of standard-compliant contracts, i.e. those contracts that have NEP-11 or NEP-17 declared in the supported standards section of the manifest. Each time balances are queried, neo-go node asks every NEP-11/NEP-17 contract for the account balance by invoking balanceOf method with the corresponding args. Invocation GAS limit is set to be 3 GAS. All non-zero balances are included in the RPC call result.

Thus, if token contract doesn't have proper standard declared in the list of supported standards but emits compliant NEP-11/NEP-17 Transfer notifications, the token balance won't be shown in the list of balances returned by the neo-go node (unlike the C# node behavior). However, transfer logs of such tokens are still available via respective getnepXXtransfers RPC calls.

The behaviour of the LastUpdatedBlock tracking for archival nodes as far as for governing token balances matches the C# node's one. For non-archival nodes and other NEP-11/NEP-17 tokens if transfer's LastUpdatedBlock is lower than the latest state synchronization point P the node working against, then LastUpdatedBlock equals P. For NEP-11 NFTs LastUpdatedBlock is equal for all tokens of the same asset.

getnep11transfers and getnep17transfers

transfernotifyindex is not tracked by NeoGo, thus this field is always zero.

Unsupported methods

Methods listed down below are not going to be supported for various reasons and we're not accepting issues related to them.

Method Reason
closewallet Doesn't fit neo-go wallet model
dumpprivkey Shouldn't exist for security reasons, see closewallet comment also
getnewaddress See closewallet comment, use CLI to do that
getwalletbalance See closewallet comment, use getnep17balances for that
getwalletunclaimedgas See closewallet comment, use getunclaimedgas for that
importprivkey Not applicable to neo-go, see closewallet comment
listaddress Not applicable to neo-go, see closewallet comment
listplugins neo-go doesn't have any plugins, so it makes no sense
openwallet Doesn't fit neo-go wallet model
sendfrom Not applicable to neo-go, see openwallet comment
sendmany Not applicable to neo-go, see openwallet comment
sendtoaddress Not applicable to neo-go, see claimgas comment

Extensions

Some additional extensions are implemented as a part of this RPC server.

getblocksysfee call

This method returns cumulative system fee for all transactions included in a block. It can be removed in future versions, but at the moment you can use it to see how much GAS is burned with particular block (because system fees are burned).

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 that is the same as of invokecontractverify, invokefunction and invokescript correspondingly. The historical call assumes that the contracts' storage state has all its values got from MPT with the specified stateroot and the transaction will be invoked using interop context with block of the specified height. This allows to perform test invocation using 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.

submitnotaryrequest call

This method can be used on P2P Notary enabled networks to submit new notary payloads to be relayed from RPC to P2P.

Limits and paging for getnep11transfers and getnep17transfers

getnep11transfers and getnep17transfers RPC calls never return more than 1000 results for one request (within specified time frame). You can pass your own limit via an additional parameter and then use paging to request the next batch of transfers.

Example requesting 10 events for address NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc within 0-1600094189000 timestamps:

{ "jsonrpc": "2.0", "id": 5, "method": "getnep17transfers", "params":
["NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc", 0, 1600094189000, 10] }

Get the next 10 transfers for the same account within the same time frame:

{ "jsonrpc": "2.0", "id": 5, "method": "getnep17transfers", "params":
["NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc", 0, 1600094189000, 10, 1] }

Websocket server

This server accepts websocket connections on ws://$BASE_URL/ws address. You can use it to perform regular RPC calls over websockets (it's supposed to be a little faster than going regular HTTP route) and you can also use it for additional functionality provided only via websockets (like notifications).

Notification subsystem

Notification subsystem consists of two additional RPC methods (subscribe and unsubscribe working only over websocket connection) that allow to subscribe to various blockchain events (with simple event filtering) and receive them on the client as JSON-RPC notifications. More details on that are written in the notifications specification.

Reference