client

package
v0.92.0 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Dec 28, 2020 License: MIT Imports: 32 Imported by: 0

Documentation

Overview

Package client implements NEO-specific JSON-RPC 2.0 client. This package is currently in alpha and is subject to change.

Client

After creating a client instance with or without a ClientConfig you can interact with the NEO blockchain by its exposed methods.

Some of the methods also allow to pass a verbose bool. This will return a more pretty printed response from the server instead of a raw hex string.

TODO: 

Add missing methods to client.
Allow client to connect using client cert.
More in-depth examples.

Supported methods 

getapplicationlog
getbestblockhash
getblock
getblockcount
getblockhash
getblockheader
getblocksysfee
getconnectioncount
getcontractstate
getnep17balances
getnep17transfers
getpeers
getrawmempool
getrawtransaction
getstorage
gettransactionheight
getunclaimedgas
getvalidators
getversion
invoke
invokefunction
invokescript
sendrawtransaction
submitblock
validateaddress

Unsupported methods 

claimgas
dumpprivkey
getbalance
getmetricblocktimestamp
getnewaddress
getwalletheight
importprivkey
listaddress
listplugins
sendfrom
sendmany
sendtoaddress
Example 
package main

import (
	"context"
	"fmt"
	"os"

	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
	"github.com/nspcc-dev/neo-go/pkg/rpc/client"
)

func main() {
	endpoint := "http://seed5.bridgeprotocol.io:10332"
	opts := client.Options{}

	c, err := client.New(context.TODO(), endpoint, opts)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	if err := c.Ping(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	addr, err := address.StringToUint160("ATySFJAbLW7QHsZGHScLhxq6EyNBxx3eFP")
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	resp, err := c.GetNEP17Balances(addr)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println(resp.Address)
	fmt.Println(resp.Balances)
}

Output:

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client represents the middleman for executing JSON RPC calls to remote NEO RPC nodes.

func New 

func New(ctx context.Context, endpoint string, opts Options) (*Client, error)

New returns a new Client ready to use. You should call Init method to initialize network magic the client is operating on.

func (*Client) AddNetworkFee added in v0.90.0 

func (c *Client) AddNetworkFee(tx *transaction.Transaction, extraFee int64, accs ...*wallet.Account) error

AddNetworkFee adds network fee for each witness script and optional extra network fee to transaction. `accs` is an array signer's accounts.

func (*Client) CalculateValidUntilBlock added in v0.90.0 

func (c *Client) CalculateValidUntilBlock() (uint32, error)

CalculateValidUntilBlock calculates ValidUntilBlock field for tx as current blockchain height + number of validators. Number of validators is the length of blockchain validators list got from GetNextBlockValidators() method. Validators count is being cached and updated every 100 blocks.

func (*Client) CreateNEP17MultiTransferTx added in v0.92.0 

func (c *Client) CreateNEP17MultiTransferTx(acc *wallet.Account, gas int64, recipients ...TransferTarget) (*transaction.Transaction, error)

CreateNEP17MultiTransferTx creates an invocation transaction for performing NEP17 transfers from a single sender to multiple recipients.

func (*Client) CreateNEP17TransferTx added in v0.92.0 

func (c *Client) CreateNEP17TransferTx(acc *wallet.Account, to util.Uint160, token util.Uint160, amount int64, gas int64) (*transaction.Transaction, error)

CreateNEP17TransferTx creates an invocation transaction for the 'transfer' method of a given contract (token) to move specified amount of NEP17 assets (in FixedN format using contract's number of decimals) to given account and returns it. The returned transaction is not signed.

func (*Client) CreateTxFromScript added in v0.91.0 

func (c *Client) CreateTxFromScript(script []byte, acc *wallet.Account, sysFee, netFee int64,
	cosigners ...transaction.Signer) (*transaction.Transaction, error)

CreateTxFromScript creates transaction and properly sets cosigners and NetworkFee. If sysFee <= 0, it is determined via result of `invokescript` RPC. You should initialize network magic with Init before calling CreateTxFromScript.

func (*Client) GetApplicationLog 

func (c *Client) GetApplicationLog(hash util.Uint256, trig *trigger.Type) (*result.ApplicationLog, error)

GetApplicationLog returns the contract log based on the specified txid.

func (*Client) GetBestBlockHash 

func (c *Client) GetBestBlockHash() (util.Uint256, error)

GetBestBlockHash returns the hash of the tallest block in the main chain.

func (*Client) GetBlockByHash 

func (c *Client) GetBlockByHash(hash util.Uint256) (*block.Block, error)

GetBlockByHash returns a block by its hash. You should initialize network magic with Init before calling GetBlockByHash.

func (*Client) GetBlockByHashVerbose 

func (c *Client) GetBlockByHashVerbose(hash util.Uint256) (*result.Block, error)

GetBlockByHashVerbose returns a block wrapper with additional metadata by its hash. You should initialize network magic with Init before calling GetBlockByHashVerbose.

func (*Client) GetBlockByIndex 

func (c *Client) GetBlockByIndex(index uint32) (*block.Block, error)

GetBlockByIndex returns a block by its height. You should initialize network magic with Init before calling GetBlockByIndex.

func (*Client) GetBlockByIndexVerbose 

func (c *Client) GetBlockByIndexVerbose(index uint32) (*result.Block, error)

GetBlockByIndexVerbose returns a block wrapper with additional metadata by its height. You should initialize network magic with Init before calling GetBlockByIndexVerbose. NOTE: to get transaction.ID and transaction.Size, use t.Hash() and io.GetVarSize(t) respectively.

func (*Client) GetBlockCount 

func (c *Client) GetBlockCount() (uint32, error)

GetBlockCount returns the number of blocks in the main chain.

func (*Client) GetBlockHash 

func (c *Client) GetBlockHash(index uint32) (util.Uint256, error)

GetBlockHash returns the hash value of the corresponding block, based on the specified index.

func (*Client) GetBlockHeader 

func (c *Client) GetBlockHeader(hash util.Uint256) (*block.Header, error)

GetBlockHeader returns the corresponding block header information from serialized hex string according to the specified script hash. You should initialize network magic // with Init before calling GetBlockHeader.

func (*Client) GetBlockHeaderVerbose 

func (c *Client) GetBlockHeaderVerbose(hash util.Uint256) (*result.Header, error)

GetBlockHeaderVerbose returns the corresponding block header information from Json format string according to the specified script hash.

func (*Client) GetBlockSysFee 

func (c *Client) GetBlockSysFee(index uint32) (fixedn.Fixed8, error)

GetBlockSysFee returns the system fees of the block, based on the specified index.

func (*Client) GetCommittee added in v0.92.0 

func (c *Client) GetCommittee() (keys.PublicKeys, error)

GetCommittee returns the current public keys of NEO nodes in committee.

func (*Client) GetConnectionCount 

func (c *Client) GetConnectionCount() (int, error)

GetConnectionCount returns the current number of connections for the node.

func (*Client) GetContractStateByAddressOrName added in v0.92.0 

func (c *Client) GetContractStateByAddressOrName(addressOrName string) (*state.Contract, error)

GetContractStateByAddressOrName queries contract information, according to the contract address or name.

func (*Client) GetContractStateByHash added in v0.92.0 

func (c *Client) GetContractStateByHash(hash util.Uint160) (*state.Contract, error)

GetContractStateByHash queries contract information, according to the contract script hash.

func (*Client) GetContractStateByID added in v0.92.0 

func (c *Client) GetContractStateByID(id int32) (*state.Contract, error)

GetContractStateByID queries contract information, according to the contract ID.

func (*Client) GetExecFeeFactor added in v0.92.0 

func (c *Client) GetExecFeeFactor() (int64, error)

GetExecFeeFactor invokes `getExecFeeFactor` method on a native Policy contract.

func (*Client) GetFeePerByte added in v0.90.0 

func (c *Client) GetFeePerByte() (int64, error)

GetFeePerByte invokes `getFeePerByte` method on a native Policy contract.

func (*Client) GetMaxBlockSize added in v0.90.0 

func (c *Client) GetMaxBlockSize() (int64, error)

GetMaxBlockSize invokes `getMaxBlockSize` method on a native Policy contract.

func (*Client) GetMaxTransactionsPerBlock added in v0.90.0 

func (c *Client) GetMaxTransactionsPerBlock() (int64, error)

GetMaxTransactionsPerBlock invokes `getMaxTransactionsPerBlock` method on a native Policy contract.

func (*Client) GetNEP17Balances added in v0.92.0 

func (c *Client) GetNEP17Balances(address util.Uint160) (*result.NEP17Balances, error)

GetNEP17Balances is a wrapper for getnep17balances RPC.

func (*Client) GetNEP17Transfers added in v0.92.0 

func (c *Client) GetNEP17Transfers(address string, start, stop *uint32, limit, page *int) (*result.NEP17Transfers, error)

GetNEP17Transfers is a wrapper for getnep17transfers RPC. Address parameter is mandatory, while all the others are optional. Start and stop parameters are supported since neo-go 0.77.0 and limit and page since neo-go 0.78.0. These parameters are positional in the JSON-RPC call, you can't specify limit and not specify start/stop for example.

func (*Client) GetNativeContractHash added in v0.92.0 

func (c *Client) GetNativeContractHash(name string) (util.Uint160, error)

GetNativeContractHash returns native contract hash by its name.

func (*Client) GetNetwork added in v0.92.0 

func (c *Client) GetNetwork() netmode.Magic

GetNetwork returns the network magic of the RPC node client connected to.

func (*Client) GetNextBlockValidators added in v0.92.0 

func (c *Client) GetNextBlockValidators() ([]result.Validator, error)

GetNextBlockValidators returns the current NEO consensus nodes information and voting status.

func (*Client) GetPeers 

func (c *Client) GetPeers() (*result.GetPeers, error)

GetPeers returns the list of nodes that the node is currently connected/disconnected from.

func (*Client) GetRawMemPool 

func (c *Client) GetRawMemPool() ([]util.Uint256, error)

GetRawMemPool returns the list of unconfirmed transactions in memory.

func (*Client) GetRawTransaction 

func (c *Client) GetRawTransaction(hash util.Uint256) (*transaction.Transaction, error)

GetRawTransaction returns a transaction by hash. You should initialize network magic with Init before calling GetRawTransaction.

func (*Client) GetRawTransactionVerbose 

func (c *Client) GetRawTransactionVerbose(hash util.Uint256) (*result.TransactionOutputRaw, error)

GetRawTransactionVerbose returns a transaction wrapper with additional metadata by transaction's hash. You should initialize network magic with Init before calling GetRawTransactionVerbose. NOTE: to get transaction.ID and transaction.Size, use t.Hash() and io.GetVarSize(t) respectively.

func (*Client) GetStorageByHash added in v0.90.0 

func (c *Client) GetStorageByHash(hash util.Uint160, key []byte) ([]byte, error)

GetStorageByHash returns the stored value, according to the contract script hash and the stored key.

func (*Client) GetStorageByID added in v0.90.0 

func (c *Client) GetStorageByID(id int32, key []byte) ([]byte, error)

GetStorageByID returns the stored value, according to the contract ID and the stored key.

func (*Client) GetTransactionHeight 

func (c *Client) GetTransactionHeight(hash util.Uint256) (uint32, error)

GetTransactionHeight returns the block index in which the transaction is found.

func (*Client) GetUnclaimedGas added in v0.90.0 

func (c *Client) GetUnclaimedGas(address string) (result.UnclaimedGas, error)

GetUnclaimedGas returns unclaimed GAS amount for the specified address.

func (*Client) GetVersion 

func (c *Client) GetVersion() (*result.Version, error)

GetVersion returns the version information about the queried node.

func (*Client) Init added in v0.92.0 

func (c *Client) Init() error

Init sets magic of the network client connected to and native NEO and GAS contracts scripthashes. This method should be called before any transaction-, header- or block-related requests in order to deserialize responses properly.

func (*Client) InvokeContractVerify added in v0.92.0 

func (c *Client) InvokeContractVerify(contract util.Uint160, params []smartcontract.Parameter, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error)

InvokeContractVerify returns the results after calling `verify` method of the smart contract with the given parameters under verification trigger type. NOTE: this is test invoke and will not affect the blockchain.

func (*Client) InvokeFunction 

func (c *Client) InvokeFunction(contract util.Uint160, operation string, params []smartcontract.Parameter, signers []transaction.Signer) (*result.Invoke, error)

InvokeFunction returns the results after calling the smart contract scripthash with the given operation and parameters. NOTE: this is test invoke and will not affect the blockchain.

func (*Client) InvokeScript 

func (c *Client) InvokeScript(script []byte, signers []transaction.Signer) (*result.Invoke, error)

InvokeScript returns the result of the given script after running it true the VM. NOTE: This is a test invoke and will not affect the blockchain.

func (*Client) IsBlocked added in v0.92.0 

func (c *Client) IsBlocked(hash util.Uint160) (bool, error)

IsBlocked invokes `isBlocked` method on native Policy contract.

func (*Client) MultiTransferNEP17 added in v0.92.0 

func (c *Client) MultiTransferNEP17(acc *wallet.Account, gas int64, recipients ...TransferTarget) (util.Uint256, error)

MultiTransferNEP17 is similar to TransferNEP17, buf allows to have multiple recipients.

func (*Client) NEP17BalanceOf added in v0.92.0 

func (c *Client) NEP17BalanceOf(tokenHash, acc util.Uint160) (int64, error)

NEP17BalanceOf invokes `balanceOf` NEP17 method on a specified contract.

func (*Client) NEP17Decimals added in v0.92.0 

func (c *Client) NEP17Decimals(tokenHash util.Uint160) (int64, error)

NEP17Decimals invokes `decimals` NEP17 method on a specified contract.

func (*Client) NEP17Symbol added in v0.92.0 

func (c *Client) NEP17Symbol(tokenHash util.Uint160) (string, error)

NEP17Symbol invokes `symbol` NEP17 method on a specified contract.

func (*Client) NEP17TokenInfo added in v0.92.0 

func (c *Client) NEP17TokenInfo(tokenHash util.Uint160) (*wallet.Token, error)

NEP17TokenInfo returns full NEP17 token info.

func (*Client) NEP17TotalSupply added in v0.92.0 

func (c *Client) NEP17TotalSupply(tokenHash util.Uint160) (int64, error)

NEP17TotalSupply invokes `totalSupply` NEP17 method on a specified contract.

func (*Client) Ping 

func (c *Client) Ping() error

Ping attempts to create a connection to the endpoint. and returns an error if there is one.

func (*Client) SendRawTransaction 

func (c *Client) SendRawTransaction(rawTX *transaction.Transaction) (util.Uint256, error)

SendRawTransaction broadcasts a transaction over the NEO network. The given hex string needs to be signed with a keypair. When the result of the response object is true, the TX has successfully been broadcasted to the network.

func (*Client) SignAndPushInvocationTx 

func (c *Client) SignAndPushInvocationTx(script []byte, acc *wallet.Account, sysfee int64, netfee fixedn.Fixed8, cosigners []transaction.Signer) (util.Uint256, error)

SignAndPushInvocationTx signs and pushes given script as an invocation transaction using given wif to sign it and spending the amount of gas specified. It returns a hash of the invocation transaction and an error.

func (*Client) StateRootInHeader added in v0.92.0 

func (c *Client) StateRootInHeader() bool

StateRootInHeader returns true if state root is contained in block header.

func (*Client) SubmitBlock 

func (c *Client) SubmitBlock(b block.Block) (util.Uint256, error)

SubmitBlock broadcasts a raw block over the NEO network.

func (*Client) TransferNEP17 added in v0.92.0 

func (c *Client) TransferNEP17(acc *wallet.Account, to util.Uint160, token util.Uint160, amount int64, gas int64) (util.Uint256, error)

TransferNEP17 creates an invocation transaction that invokes 'transfer' method on a given token to move specified amount of NEP17 assets (in FixedN format using contract's number of decimals) to given account and sends it to the network returning just a hash of it.

func (*Client) ValidateAddress 

func (c *Client) ValidateAddress(address string) error

ValidateAddress verifies that the address is a correct NEO address.

type Notification added in v0.75.0 

type Notification struct {
	Type  response.EventID
	Value interface{}
}

Notification represents server-generated notification for client subscriptions. Value can be one of block.Block, result.ApplicationLog, result.NotificationEvent or transaction.Transaction based on Type.

type Options 

type Options struct {
	// Cert is a client-side certificate, it doesn't work at the moment along
	// with the other two options below.
	Cert           string
	Key            string
	CACert         string
	DialTimeout    time.Duration
	RequestTimeout time.Duration
}

Options defines options for the RPC client. All values are optional. If any duration is not specified a default of 4 seconds will be used.

type TransferTarget added in v0.91.0 

type TransferTarget struct {
	Token   util.Uint160
	Address util.Uint160
	Amount  int64
}

TransferTarget represents target address and token amount for transfer.

type WSClient added in v0.75.0 

type WSClient struct {
	Client
	// Notifications is a channel that is used to send events received from
	// server. Client's code is supposed to be reading from this channel if
	// it wants to use subscription mechanism, failing to do so will cause
	// WSClient to block even regular requests. This channel is not buffered.
	// In case of protocol error or upon connection closure this channel will
	// be closed, so make sure to handle this.
	Notifications chan Notification
	// contains filtered or unexported fields
}

WSClient is a websocket-enabled RPC client that can be used with appropriate servers. It's supposed to be faster than Client because it has persistent connection to the server and at the same time is exposes some functionality that is only provided via websockets (like event subscription mechanism).

func NewWS added in v0.75.0 

func NewWS(ctx context.Context, endpoint string, opts Options) (*WSClient, error)

NewWS returns a new WSClient ready to use (with established websocket connection). You need to use websocket URL for it like `ws://1.2.3.4/ws`. You should call Init method to initialize network magic the client is operating on.

func (*WSClient) Close added in v0.75.0 

func (c *WSClient) Close()

Close closes connection to the remote side rendering this client instance unusable.

func (*WSClient) SubscribeForExecutionNotifications added in v0.75.0 

func (c *WSClient) SubscribeForExecutionNotifications(contract *util.Uint160, name *string) (string, error)

SubscribeForExecutionNotifications adds subscription for notifications generated during transaction execution to this instance of client. It can be filtered by contract's hash (that emits notifications), nil value puts no such restrictions.

func (*WSClient) SubscribeForNewBlocks added in v0.75.0 

func (c *WSClient) SubscribeForNewBlocks(primary *int) (string, error)

SubscribeForNewBlocks adds subscription for new block events to this instance of client. It can filtered by primary consensus node index, nil value doesn't add any filters.

func (*WSClient) SubscribeForNewTransactions added in v0.75.0 

func (c *WSClient) SubscribeForNewTransactions(sender *util.Uint160, signer *util.Uint160) (string, error)

SubscribeForNewTransactions adds subscription for new transaction events to this instance of client. It can be filtered by sender and/or signer, nil value is treated as missing filter.

func (*WSClient) SubscribeForTransactionExecutions added in v0.75.0 

func (c *WSClient) SubscribeForTransactionExecutions(state *string) (string, error)

SubscribeForTransactionExecutions adds subscription for application execution results generated during transaction execution to this instance of client. Can be filtered by state (HALT/FAULT) to check for successful or failing transactions, nil value means no filtering.

func (*WSClient) Unsubscribe added in v0.75.0 

func (c *WSClient) Unsubscribe(id string) error

Unsubscribe removes subscription for given event stream.

func (*WSClient) UnsubscribeAll added in v0.75.0 

func (c *WSClient) UnsubscribeAll() error

UnsubscribeAll removes all active subscriptions of current client.

Source Files

View all Source files

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.