client

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Published: Jul 12, 2023 License: GPL-3.0 Imports: 42 Imported by: 0

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Index

Constants

View Source
const (

	// NNSAuditContractName is a name of the audit contract in NNS.
	NNSAuditContractName = "audit.frostfs"
	// NNSBalanceContractName is a name of the balance contract in NNS.
	NNSBalanceContractName = "balance.frostfs"
	// NNSContainerContractName is a name of the container contract in NNS.
	NNSContainerContractName = "container.frostfs"
	// NNSFrostFSIDContractName is a name of the frostfsid contract in NNS.
	NNSFrostFSIDContractName = "frostfsid.frostfs"
	// NNSNetmapContractName is a name of the netmap contract in NNS.
	NNSNetmapContractName = "netmap.frostfs"
	// NNSProxyContractName is a name of the proxy contract in NNS.
	NNSProxyContractName = "proxy.frostfs"
	// NNSReputationContractName is a name of the reputation contract in NNS.
	NNSReputationContractName = "reputation.frostfs"
	// NNSSubnetworkContractName is a name of the subnet contract in NNS.
	NNSSubnetworkContractName = "subnet.frostfs"
	// NNSGroupKeyName is a name for the FrostFS group key record in NNS.
	NNSGroupKeyName = "group.frostfs"
)
View Source
const HaltState = "HALT"

HaltState returned if TestInvoke function processed without panic.

Variables

View Source
var (
	// ErrNilClient is returned by functions that expect
	// a non-nil Client pointer, but received nil.
	ErrNilClient = errors.New("client is nil")

	// ErrConnectionLost is returned when client lost web socket connection
	// to the RPC node and has not been able to establish a new one since.
	ErrConnectionLost = errors.New("connection to the RPC node has been lost")
)
View Source
var (
	// ErrNNSRecordNotFound means that there is no such record in NNS contract.
	ErrNNSRecordNotFound = errors.New("record has not been found in NNS contract")
)

Functions

func ArrayFromStackItem

func ArrayFromStackItem(param stackitem.Item) ([]stackitem.Item, error)

ArrayFromStackItem returns the slice contract parameters from passed parameter.

If passed parameter carries boolean false value, (nil, nil) returns.

func BigIntFromStackItem

func BigIntFromStackItem(param stackitem.Item) (*big.Int, error)

BigIntFromStackItem receives numerical value from the value of a smart contract parameter.

func BoolFromStackItem

func BoolFromStackItem(param stackitem.Item) (bool, error)

BoolFromStackItem receives boolean value from the value of a smart contract parameter.

func BytesFromStackItem

func BytesFromStackItem(param stackitem.Item) ([]byte, error)

BytesFromStackItem receives binary value from the value of a smart contract parameter.

func CalculateNotaryDepositAmount

func CalculateNotaryDepositAmount(c *Client, gasMul, gasDiv int64) (fixedn.Fixed8, error)

CalculateNotaryDepositAmount calculates notary deposit amount using the rule:

IF notaryBalance < gasBalance * gasMul {
    DEPOSIT gasBalance / gasDiv
} ELSE {
    DEPOSIT 1
}

gasMul and gasDiv must be positive.

func IntFromStackItem

func IntFromStackItem(param stackitem.Item) (int64, error)

IntFromStackItem receives numerical value from the value of a smart contract parameter.

func NNSAlphabetContractName

func NNSAlphabetContractName(index int) string

NNSAlphabetContractName returns contract name of the alphabet contract in NNS based on alphabet index.

func StringFromStackItem

func StringFromStackItem(param stackitem.Item) (string, error)

StringFromStackItem receives string value from the value of a smart contract parameter.

Types

type AlphabetKeys

type AlphabetKeys func() (keys.PublicKeys, error)

type Callback

type Callback func()

Callback is a function that is going to be called on certain Client's state.

type Client

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

Client is a wrapper over web socket neo-go client that provides smart-contract invocation interface and notification subscription functionality.

On connection lost tries establishing new connection to the next RPC (if any). If no RPC node available, switches to inactive mode: any RPC call leads to immediate return with ErrConnectionLost error, notification channel returned from Client.NotificationChannel is closed.

Working client must be created via constructor New. Using the Client that has been created with new(Client) expression (or just declaring a Client variable) is unsafe and can lead to panic.

func New

func New(ctx context.Context, key *keys.PrivateKey, opts ...Option) (*Client, error)

New creates, initializes and returns the Client instance. Notary support should be enabled with EnableNotarySupport client method separately.

If private key is nil, it panics.

Other values are set according to provided options, or by default:

  • client context: Background;
  • dial timeout: 5s;
  • blockchain network type: netmode.PrivNet;
  • signer with the global scope;
  • wait interval: 500ms;
  • logger: &logger.Logger{Logger: zap.L()}.

If desired option satisfies the default value, it can be omitted. If multiple options of the same config value are supplied, the option with the highest index in the arguments will be used.

func (*Client) BatchTransferGas

func (c *Client) BatchTransferGas(receivers []util.Uint160, amount fixedn.Fixed8) error

func (*Client) BlockCount

func (c *Client) BlockCount() (res uint32, err error)

BlockCount returns block count of the network to which the underlying RPC node client is connected.

func (*Client) CalculateNonceAndVUB

func (c *Client) CalculateNonceAndVUB(hash util.Uint256) (nonce uint32, vub uint32, err error)

CalculateNonceAndVUB calculates nonce and ValidUntilBlock values based on transaction hash.

func (*Client) Close

func (c *Client) Close()

Close closes connection to the remote side making this client instance unusable. Closes notification channel returned from Client.NotificationChannel(), Removes all subscription.

func (*Client) Committee

func (c *Client) Committee() (res keys.PublicKeys, err error)

Committee returns keys of chain committee from neo native contract.

func (*Client) DepositEndlessNotary

func (c *Client) DepositEndlessNotary(amount fixedn.Fixed8) (res util.Uint256, err error)

DepositEndlessNotary calls notary deposit method. Unlike `DepositNotary`, this method sets notary deposit till parameter to a maximum possible value. This allows to avoid ValidAfterDeposit failures.

This function must be invoked with notary enabled otherwise it throws panic.

func (*Client) DepositNotary

func (c *Client) DepositNotary(amount fixedn.Fixed8, delta uint32) (res util.Uint256, err error)

DepositNotary calls notary deposit method. Deposit is required to operate with notary contract. It used by notary contract in to produce fallback tx if main tx failed to create. Deposit isn't last forever, so it should be called periodically. Notary support should be enabled in client to use this function.

This function must be invoked with notary enabled otherwise it throws panic.

func (*Client) EnableNotarySupport

func (c *Client) EnableNotarySupport(opts ...NotaryOption) error

EnableNotarySupport creates notary structure in client that provides ability for client to get alphabet keys from committee or provided source and use proxy contract script hash to create tx for notary contract.

func (*Client) GasBalance

func (c *Client) GasBalance() (res int64, err error)

GasBalance returns GAS amount in the client's wallet.

func (*Client) GetDesignateHash

func (c *Client) GetDesignateHash() util.Uint160

GetDesignateHash returns hash of the native `RoleManagement` contract.

func (*Client) GetNotaryDeposit

func (c *Client) GetNotaryDeposit() (res int64, err error)

GetNotaryDeposit returns deposit of client's account in notary contract. Notary support should be enabled in client to use this function.

This function must be invoked with notary enabled otherwise it throws panic.

func (*Client) Invoke

func (c *Client) Invoke(contract util.Uint160, fee fixedn.Fixed8, method string, args ...any) error

Invoke invokes contract method by sending transaction into blockchain. Supported args types: int64, string, util.Uint160, []byte and bool.

func (*Client) IsNotaryEnabled

func (c *Client) IsNotaryEnabled() bool

IsNotaryEnabled returns true if EnableNotarySupport has been successfully called before.

func (*Client) IsValidScript

func (c *Client) IsValidScript(script []byte, signers []transaction.Signer) (valid bool, err error)

IsValidScript returns true if invocation script executes with HALT state.

func (*Client) MagicNumber

func (c *Client) MagicNumber() (uint64, error)

MagicNumber returns the magic number of the network to which the underlying RPC node client is connected.

func (*Client) MsPerBlock

func (c *Client) MsPerBlock() (res int64, err error)

MsPerBlock returns MillisecondsPerBlock network parameter.

func (*Client) NNSContractAddress

func (c *Client) NNSContractAddress(name string) (sh util.Uint160, err error)

NNSContractAddress returns contract address script hash based on its name in NNS contract. If script hash has not been found, returns ErrNNSRecordNotFound.

func (*Client) NNSHash

func (c *Client) NNSHash() (util.Uint160, error)

NNSHash returns NNS contract hash.

func (*Client) NeoFSAlphabetList

func (c *Client) NeoFSAlphabetList() (res keys.PublicKeys, err error)

NeoFSAlphabetList returns keys that stored in NeoFS Alphabet role. Main chain stores alphabet node keys of inner ring there, however the sidechain stores both alphabet and non alphabet node keys of inner ring.

func (*Client) NotaryInvoke

func (c *Client) NotaryInvoke(contract util.Uint160, fee fixedn.Fixed8, nonce uint32, vub *uint32, method string, args ...any) error

NotaryInvoke invokes contract method by sending tx to notary contract in blockchain. Fallback tx is a `RET`. If Notary support is not enabled it fallbacks to a simple `Invoke()`.

`nonce` and `vub` are used only if notary is enabled.

func (*Client) NotaryInvokeNotAlpha

func (c *Client) NotaryInvokeNotAlpha(contract util.Uint160, fee fixedn.Fixed8, method string, args ...any) error

NotaryInvokeNotAlpha does the same as NotaryInvoke but does not use client's private key in Invocation script. It means that main TX of notary request is not expected to be signed by the current node.

Considered to be used by non-IR nodes.

func (*Client) NotarySignAndInvokeTX

func (c *Client) NotarySignAndInvokeTX(mainTx *transaction.Transaction) error

NotarySignAndInvokeTX signs and sends notary request that was received from Notary service. NOTE: does not fallback to simple `Invoke()`. Expected to be used only for TXs retrieved from the received notary requests.

func (*Client) NotificationChannel

func (c *Client) NotificationChannel() <-chan rpcclient.Notification

NotificationChannel returns channel than receives subscribed notification from the connected RPC node. Channel is closed when connection to the RPC node is lost.

func (*Client) ProbeNotary

func (c *Client) ProbeNotary() (res bool)

ProbeNotary checks if native `Notary` contract is presented on chain.

func (*Client) ReceiveBlocks

func (c *Client) ReceiveBlocks(ch chan<- *block.Block) (string, error)

ReceiveBlocks performs subscription for new block events. Events are sent to the specified channel.

Returns ErrConnectionLost if client has not been able to establish connection to any of passed RPC endpoints.

func (*Client) ReceiveExecutionNotifications

func (c *Client) ReceiveExecutionNotifications(contract util.Uint160, ch chan<- *state.ContainedNotificationEvent) (string, error)

ReceiveExecutionNotifications performs subscription for notifications generated during contract execution. Events are sent to the specified channel.

Returns ErrConnectionLost if client has not been able to establish connection to any of passed RPC endpoints.

func (*Client) ReceiveNotaryRequests

func (c *Client) ReceiveNotaryRequests(txSigner util.Uint160, ch chan<- *result.NotaryRequestEvent) (string, error)

ReceiveNotaryRequests performsn subscription for notary request payloads addition or removal events to this instance of client. Passed txSigner is used as filter: subscription is only for the notary requests that must be signed by txSigner. Events are sent to the specified channel.

Returns ErrConnectionLost if client has not been able to establish connection to any of passed RPC endpoints.

func (*Client) SetGroupSignerScope

func (c *Client) SetGroupSignerScope() error

SetGroupSignerScope makes the default signer scope include all FrostFS contracts. Should be called for side-chain client only.

func (*Client) SwitchRPC

func (c *Client) SwitchRPC(ctx context.Context) bool

SwitchRPC performs reconnection and returns true if it was successful.

func (*Client) TestInvoke

func (c *Client) TestInvoke(contract util.Uint160, method string, args ...any) (res []stackitem.Item, err error)

TestInvoke invokes contract method locally in neo-go node. This method should be used to read data from smart-contract.

func (*Client) TestInvokeIterator

func (c *Client) TestInvokeIterator(cb func(stackitem.Item) error, contract util.Uint160, method string, args ...interface{}) error

TestInvokeIterator invokes contract method returning an iterator and executes cb on each element. If cb returns an error, the session is closed and this error is returned as-is. If the remove neo-go node does not support sessions, `unwrap.ErrNoSessionID` is returned.

func (*Client) TransferGas

func (c *Client) TransferGas(receiver util.Uint160, amount fixedn.Fixed8) error

TransferGas to the receiver from local wallet.

func (*Client) TxHalt

func (c *Client) TxHalt(h util.Uint256) (res bool, err error)

TxHalt returns true if transaction has been successfully executed and persisted.

func (*Client) TxHeight

func (c *Client) TxHeight(h util.Uint256) (res uint32, err error)

TxHeight returns true if transaction has been successfully executed and persisted.

func (*Client) Unsubscribe

func (c *Client) Unsubscribe(subID string) error

Unsubscribe performs unsubscription for the given subscription ID.

Returns ErrConnectionLost if client has not been able to establish connection to any of passed RPC endpoints.

func (*Client) UnsubscribeAll

func (c *Client) UnsubscribeAll() error

UnsubscribeAll removes all active subscriptions of current client.

Returns ErrConnectionLost if client has not been able to establish connection to any of passed RPC endpoints.

func (*Client) UpdateNeoFSAlphabetList

func (c *Client) UpdateNeoFSAlphabetList(prm UpdateAlphabetListPrm) error

UpdateNeoFSAlphabetList updates list of alphabet nodes in designate contract. As for sidechain list should contain all inner ring nodes. Requires committee multi signature.

This function must be invoked with notary enabled otherwise it throws panic.

func (*Client) UpdateNotaryList

func (c *Client) UpdateNotaryList(prm UpdateNotaryListPrm) error

UpdateNotaryList updates list of notary nodes in designate contract. Requires committee multi signature.

This function must be invoked with notary enabled otherwise it throws panic.

func (*Client) Wait

func (c *Client) Wait(ctx context.Context, n uint32) error

Wait function blocks routing execution until there are `n` new blocks in the chain.

Returns only connection errors.

type Endpoint

type Endpoint struct {
	Address  string
	Priority int
}

Endpoint represents morph endpoint together with its priority.

type InvokePrm

type InvokePrm struct {
	TestInvokePrm

	// optional parameters
	InvokePrmOptional
}

InvokePrm groups parameters of the Invoke operation.

type InvokePrmOptional

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

InvokePrmOptional groups optional parameters of the Invoke operation.

func (*InvokePrmOptional) SetHash

func (i *InvokePrmOptional) SetHash(hash util.Uint256)

SetHash sets optional hash of the transaction. If hash is set and notary is enabled, StaticClient uses it for notary nonce and `validUntilBlock` calculation.

type NotaryOption

type NotaryOption func(*notaryCfg)

func WithAlphabetSource

func WithAlphabetSource(t AlphabetKeys) NotaryOption

WithAlphabetSource returns a notary support option for client that specifies function to return list of alphabet node keys. By default notary subsystem uses committee as a source. This is valid for side chain but notary in main chain should override it.

func WithFallbackTime

func WithFallbackTime(t uint32) NotaryOption

WithFallbackTime returns a notary support option for client that specifies amount of blocks before fallbackTx will be sent. Should be less than TxValidTime.

func WithProxyContract

func WithProxyContract(h util.Uint160) NotaryOption

WithProxyContract sets proxy contract hash.

func WithRoundTime

func WithRoundTime(t uint32) NotaryOption

WithRoundTime returns a notary support option for client that specifies extra blocks to synchronize side chain height diff of inner ring nodes.

func WithTxValidTime

func WithTxValidTime(t uint32) NotaryOption

WithTxValidTime returns a notary support option for client that specifies minimum amount of blocks when mainTx will be valid.

type Option

type Option func(*cfg)

Option is a client configuration change function.

func WithConnLostCallback

func WithConnLostCallback(cb Callback) Option

WithConnLostCallback return a client constructor option that specifies a callback that is called when Client unsuccessfully tried to connect to all the specified endpoints.

func WithDialTimeout

func WithDialTimeout(dur time.Duration) Option

WithDialTimeout returns a client constructor option that specifies neo-go client dial timeout duration.

Ignores non-positive value. Has no effect if WithSingleClient is provided.

If option not provided, 5s timeout is used.

func WithEndpoints

func WithEndpoints(endpoints ...Endpoint) Option

WithEndpoints returns a client constructor option that specifies additional Neo rpc endpoints.

func WithLogger

func WithLogger(logger *logger.Logger) Option

WithLogger returns a client constructor option that specifies the component for writing log messages.

Ignores nil value.

If option not provided, &logger.Logger{Logger: zap.L()} is used.

func WithSigner

func WithSigner(signer *transaction.Signer) Option

WithSigner returns a client constructor option that specifies the signer and the scope of the transaction.

Ignores nil value.

If option not provided, signer with global scope is used.

func WithSingleClient

func WithSingleClient(cli *rpcclient.WSClient) Option

WithSingleClient returns a client constructor option that specifies single neo-go client and forces Client to use it for requests.

Passed client must already be initialized.

func WithSwitchInterval

func WithSwitchInterval(i time.Duration) Option

WithSwitchInterval returns a client constructor option that specifies a wait interval b/w attempts to reconnect to an RPC node with the highest priority.

type StaticClient

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

StaticClient is a wrapper over Neo:Morph client that invokes single smart contract methods with fixed fee.

Working static client must be created via constructor NewStatic. Using the StaticClient that has been created with new(StaticClient) expression (or just declaring a StaticClient variable) is unsafe and can lead to panic.

func NewStatic

func NewStatic(client *Client, scriptHash util.Uint160, fee fixedn.Fixed8, opts ...StaticClientOption) (*StaticClient, error)

NewStatic creates, initializes and returns the StaticClient instance.

If provided Client instance is nil, ErrNilClient is returned.

Specified fee is used by default. Per-operation fees can be customized via WithCustomFee option.

func (StaticClient) ContractAddress

func (s StaticClient) ContractAddress() util.Uint160

ContractAddress returns the address of the associated contract.

func (StaticClient) Invoke

func (s StaticClient) Invoke(prm InvokePrm) error

Invoke calls Invoke method of Client with static internal script hash and fee. Supported args types are the same as in Client.

If TryNotary is provided:

  • if AsAlphabet is provided, calls NotaryInvoke;
  • otherwise, calls NotaryInvokeNotAlpha.

If fee for the operation executed using specified method is customized, then StaticClient uses it. Otherwise, default fee is used.

func (*StaticClient) IsAlpha

func (s *StaticClient) IsAlpha() bool

IsAlpha returns Alphabet status of the client.

See also AsAlphabet.

func (StaticClient) Morph

func (s StaticClient) Morph() *Client

Morph return wrapped raw morph client.

func (StaticClient) TestInvoke

func (s StaticClient) TestInvoke(prm TestInvokePrm) ([]stackitem.Item, error)

TestInvoke calls TestInvoke method of Client with static internal script hash.

func (*StaticClient) WithNotary

func (s *StaticClient) WithNotary() bool

WithNotary returns notary status of the client.

See also TryNotary.

type StaticClientOption

type StaticClientOption func(*staticOpts)

StaticClientOption allows to set an optional parameter of StaticClient.

func AsAlphabet

func AsAlphabet() StaticClientOption

AsAlphabet returns option to sign main TX of notary requests with client's private key.

Considered to be used by IR nodes only.

func TryNotary

func TryNotary() StaticClientOption

TryNotary returns option to enable notary invocation tries.

func WithCustomFee

func WithCustomFee(method string, fee fixedn.Fixed8) StaticClientOption

WithCustomFee returns option to specify custom fee for the operation executed using specified contract method.

type TestInvokePrm

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

TestInvokePrm groups parameters of the TestInvoke operation.

func (*TestInvokePrm) SetArgs

func (ti *TestInvokePrm) SetArgs(args ...any)

SetArgs sets arguments of the contact call.

func (*TestInvokePrm) SetMethod

func (ti *TestInvokePrm) SetMethod(method string)

SetMethod sets method of the contract to call.

type UpdateAlphabetListPrm

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

UpdateAlphabetListPrm groups parameters of UpdateNeoFSAlphabetList operation.

func (*UpdateAlphabetListPrm) SetHash

func (u *UpdateAlphabetListPrm) SetHash(hash util.Uint256)

SetHash sets hash of the transaction that led to the update of the alphabet role in the designate contract.

func (*UpdateAlphabetListPrm) SetList

func (u *UpdateAlphabetListPrm) SetList(list keys.PublicKeys)

SetList sets a list of the new alphabet role keys.

type UpdateNotaryListPrm

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

UpdateNotaryListPrm groups parameters of UpdateNotaryList operation.

func (*UpdateNotaryListPrm) SetHash

func (u *UpdateNotaryListPrm) SetHash(hash util.Uint256)

SetHash sets hash of the transaction that led to the update of the notary role in the designate contract.

func (*UpdateNotaryListPrm) SetList

func (u *UpdateNotaryListPrm) SetList(list keys.PublicKeys)

SetList sets a list of the new notary role keys.

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