frostfs-node/pkg/morph/client/constructor.go

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package client
import (
"context"
"errors"
"fmt"
"sync"
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"time"
lru "github.com/hashicorp/golang-lru"
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/rpcclient"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/nep17"
"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
"github.com/nspcc-dev/neofs-node/pkg/util/logger"
"go.uber.org/zap"
)
// Option is a client configuration change function.
type Option func(*cfg)
// Callback is a function that is going to be called
// on certain Client's state.
type Callback func()
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// groups the configurations with default values.
type cfg struct {
ctx context.Context // neo-go client context
dialTimeout time.Duration // client dial timeout
logger *logger.Logger // logging component
waitInterval time.Duration
signer *transaction.Signer
endpoints []Endpoint
singleCli *rpcclient.WSClient // neo-go client for single client mode
inactiveModeCb Callback
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}
const (
defaultDialTimeout = 5 * time.Second
defaultWaitInterval = 500 * time.Millisecond
)
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func defaultConfig() *cfg {
return &cfg{
ctx: context.Background(),
dialTimeout: defaultDialTimeout,
logger: zap.L(),
waitInterval: defaultWaitInterval,
signer: &transaction.Signer{
Scopes: transaction.Global,
},
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}
}
// New creates, initializes and returns the Client instance.
// Notary support should be enabled with EnableNotarySupport client
// method separately.
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//
// If private key is nil, it panics.
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//
// 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: zap.L().
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//
// 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 New(key *keys.PrivateKey, opts ...Option) (*Client, error) {
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if key == nil {
panic("empty private key")
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}
acc := wallet.NewAccountFromPrivateKey(key)
accAddr := key.GetScriptHash()
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// build default configuration
cfg := defaultConfig()
// apply options
for _, opt := range opts {
opt(cfg)
}
if len(cfg.endpoints) == 0 {
return nil, errors.New("no endpoints were provided")
}
cli := &Client{
cache: newClientCache(),
logger: cfg.logger,
acc: acc,
accAddr: accAddr,
signer: cfg.signer,
cfg: *cfg,
switchLock: &sync.RWMutex{},
notifications: make(chan rpcclient.Notification),
subscribedEvents: make(map[util.Uint160]string),
subscribedNotaryEvents: make(map[util.Uint160]string),
closeChan: make(chan struct{}),
}
cli.endpoints.init(cfg.endpoints)
var err error
if cfg.singleCli != nil {
// return client in single RPC node mode that uses
// predefined WS client
//
// in case of the closing web socket connection:
// if extra endpoints were provided via options,
// they will be used in switch process, otherwise
// inactive mode will be enabled
cli.client = cfg.singleCli
cli.rpcActor, err = newActor(cfg.singleCli, acc, *cfg)
if err != nil {
return nil, fmt.Errorf("could not create RPC actor: %w", err)
}
cli.gasToken, err = newGasToken(cli.client, cli.rpcActor)
if err != nil {
return nil, fmt.Errorf("could not create gas token actor: %w", err)
}
} else {
cli.client, cli.rpcActor, cli.gasToken, err = cli.newCli(cli.endpoints.list[0].Address)
if err != nil {
return nil, fmt.Errorf("could not create RPC client: %w", err)
}
}
go cli.notificationLoop()
return cli, nil
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}
func (c *Client) newCli(endpoint string) (*rpcclient.WSClient, *actor.Actor, *nep17.Token, error) {
cli, err := rpcclient.NewWS(c.cfg.ctx, endpoint, rpcclient.Options{
DialTimeout: c.cfg.dialTimeout,
})
if err != nil {
return nil, nil, nil, fmt.Errorf("WS client creation: %w", err)
}
err = cli.Init()
if err != nil {
return nil, nil, nil, fmt.Errorf("WS client initialization: %w", err)
}
act, err := newActor(cli, c.acc, c.cfg)
if err != nil {
return nil, nil, nil, fmt.Errorf("RPC actor creation: %w", err)
}
gas, err := newGasToken(cli, act)
if err != nil {
return nil, nil, nil, fmt.Errorf("gas token actor: %w", err)
}
return cli, act, gas, nil
}
func newActor(ws *rpcclient.WSClient, acc *wallet.Account, cfg cfg) (*actor.Actor, error) {
return actor.New(ws, []actor.SignerAccount{{
Signer: transaction.Signer{
Account: acc.PrivateKey().PublicKey().GetScriptHash(),
Scopes: cfg.signer.Scopes,
AllowedContracts: cfg.signer.AllowedContracts,
AllowedGroups: cfg.signer.AllowedGroups,
},
Account: acc,
}})
}
func newGasToken(cli *rpcclient.WSClient, a *actor.Actor) (*nep17.Token, error) {
gasHash, err := cli.GetNativeContractHash(nativenames.Gas)
if err != nil {
return nil, fmt.Errorf("gas contract hash: %w", err)
}
return nep17.New(a, gasHash), nil
}
func newClientCache() cache {
c, _ := lru.New(100) // returns error only if size is negative
return cache{
m: &sync.RWMutex{},
txHeights: c,
}
}
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// WithContext returns a client constructor option that
// specifies the neo-go client context.
//
// Ignores nil value. Has no effect if WithSingleClient
// is provided.
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//
// If option not provided, context.Background() is used.
func WithContext(ctx context.Context) Option {
return func(c *cfg) {
if ctx != nil {
c.ctx = ctx
}
}
}
// 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.
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//
// If option not provided, 5s timeout is used.
func WithDialTimeout(dur time.Duration) Option {
return func(c *cfg) {
if dur > 0 {
c.dialTimeout = dur
}
}
}
// WithLogger returns a client constructor option
// that specifies the component for writing log messages.
//
// Ignores nil value.
//
// If option not provided, zap.L() is used.
func WithLogger(logger *logger.Logger) Option {
return func(c *cfg) {
if logger != nil {
c.logger = logger
}
}
}
// 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 WithSigner(signer *transaction.Signer) Option {
return func(c *cfg) {
if signer != nil {
c.signer = signer
}
}
}
// WithEndpoints returns a client constructor option
// that specifies additional Neo rpc endpoints.
func WithEndpoints(endpoints ...Endpoint) Option {
return func(c *cfg) {
c.endpoints = append(c.endpoints, endpoints...)
}
}
// 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 WithSingleClient(cli *rpcclient.WSClient) Option {
return func(c *cfg) {
c.singleCli = cli
}
}
// 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 WithConnLostCallback(cb Callback) Option {
return func(c *cfg) {
c.inactiveModeCb = cb
}
}