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

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package client
import (
"context"
"crypto/ecdsa"
"time"
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/rpc/client"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/wallet"
crypto "github.com/nspcc-dev/neofs-crypto"
"github.com/nspcc-dev/neofs-node/pkg/util/logger"
"go.uber.org/zap"
)
// Option is a client configuration change function.
type Option func(*cfg)
// 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
gas util.Uint160 // native gas script-hash
waitInterval time.Duration
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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,
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}
}
// New creates, initializes and returns the Client instance.
//
// If private key is nil, crypto.ErrEmptyPrivateKey is returned.
//
// Other values are set according to provided options, or by default:
// * client context: Background;
// * dial timeout: 5s;
// * blockchain network type: netmode.PrivNet;
// * 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 New(key *ecdsa.PrivateKey, endpoint string, opts ...Option) (*Client, error) {
if key == nil {
return nil, crypto.ErrEmptyPrivateKey
}
privKeyBytes := crypto.MarshalPrivateKey(key)
wif, err := keys.WIFEncode(privKeyBytes, keys.WIFVersion, true)
if err != nil {
return nil, err
}
account, err := wallet.NewAccountFromWIF(wif)
if err != nil {
return nil, err
}
// build default configuration
cfg := defaultConfig()
// apply options
for _, opt := range opts {
opt(cfg)
}
cli, err := client.New(cfg.ctx, endpoint, client.Options{
DialTimeout: cfg.dialTimeout,
})
if err != nil {
return nil, err
}
err = cli.Init() // magic number is set there based on RPC node answer
if err != nil {
return nil, err
}
gas, err := cli.GetNativeContractHash(nativenames.Gas)
if err != nil {
return nil, err
}
designate, err := cli.GetNativeContractHash(nativenames.Designation)
if err != nil {
return nil, err
}
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return &Client{
logger: cfg.logger,
client: cli,
acc: account,
gas: gas,
designate: designate,
waitInterval: cfg.waitInterval,
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}, nil
}
// WithContext returns a client constructor option that
// specifies the neo-go client context.
//
// Ignores nil value.
//
// 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.
//
// 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
}
}
}