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https://github.com/nspcc-dev/neo-go.git
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e8bed184d5
Request NEP17 balances from a set of NEP17 contracts instead of getting them from storage. LastUpdatedBlock tracking remains untouched, because there's no way to retrieve it dynamically.
195 lines
6.6 KiB
Markdown
195 lines
6.6 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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"jsonrpc" : "2.0",
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"id" : 1,
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"result" : {
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"port" : 20333,
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"useragent" : "/NEO-GO:0.36.0-dev/",
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"nonce" : 9318417
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}
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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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| `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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| `getcommittee` |
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| `getconnectioncount` |
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| `getcontractstate` |
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| `getnativecontracts` |
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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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| `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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| `validateaddress` |
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| `verifyproof` |
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#### Implementation notices
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##### `invokefunction`
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neo-go's 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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Lacking this signature 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 contract scripthash, but also
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with contract name (for native contracts) or contract ID (for all contracts). This
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feature is not supported by the C# node.
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##### `getunclaimedgas`
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It's possible to call this method for any address with neo-go, unlike with C#
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node where it only works for addresses from opened wallet.
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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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##### `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.
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#### `getnep17balances`
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neo-go's implementation of `getnep17balances` does not perform tracking of NEP17
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balances for each account as it is done in the C# node. Instead, neo-go node
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maintains the list of NEP17-compliant contracts, i.e. those contracts that have
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`NEP-17` declared in the supported standards section of the manifest. Each time
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`getnep17balances` is queried, neo-go node asks every NEP17 contract for the
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account balance by invoking `balanceOf` method with the corresponding args.
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Invocation GAS limit is set to be 3 GAS. All non-zero NEP17 balances are included
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in the RPC call result.
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Thus, if NEP17 token contract doesn't have `NEP-17` standard declared in the list
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of supported standards but emits proper NEP17 `Transfer` notifications, the token
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balance won't be shown in the list of NEP17 balances returned by the neo-go node
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(unlike the C# node behavior). However, transfer logs of such token are still
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available via `getnep17transfers` RPC call.
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The behaviour of the `LastUpdatedBlock` tracking matches the C# node's one.
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### Unsupported methods
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Methods listed down 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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| ------- | ------------|
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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 particular block (because system fees are
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burned).
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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 getnep17transfers
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`getnep17transfers` RPC call never returns more than 1000 results for one
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request (within specified time frame). You can pass your own limit via an
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additional parameter and then use paging to request the next batch of
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transfers.
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Example requesting 10 events for address NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc
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within 0-1600094189 timestamps:
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```json
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{ "jsonrpc": "2.0", "id": 5, "method": "getnep17transfers", "params":
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["NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc", 0, 1600094189, 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, 1600094189, 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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