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

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package client
import (
"context"
"time"
"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/rpc/client"
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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)
// 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
extraEndpoints []string
maxConnPerHost int
singleCli *client.Client // neo-go client for single client mode
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}
const (
defaultDialTimeout = 5 * time.Second
defaultWaitInterval = 500 * time.Millisecond
defaultMaxConnPerHost = 10
)
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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,
},
maxConnPerHost: defaultMaxConnPerHost,
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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;
// * 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 *keys.PrivateKey, endpoint string, opts ...Option) (*Client, error) {
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if key == nil {
panic("empty private key")
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}
// build default configuration
cfg := defaultConfig()
// apply options
for _, opt := range opts {
opt(cfg)
}
if cfg.singleCli != nil {
return &Client{
singleClient: blankSingleClient(cfg.singleCli, wallet.NewAccountFromPrivateKey(key), cfg),
}, nil
}
endpoints := append(cfg.extraEndpoints, endpoint)
return &Client{
multiClient: &multiClient{
cfg: *cfg,
account: wallet.NewAccountFromPrivateKey(key),
endpoints: endpoints,
clients: make(map[string]*Client, len(endpoints)),
},
}, nil
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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
}
}
}
// WithExtraEndpoints returns a client constructor option
// that specifies additional Neo rpc endpoints.
//
// Has no effect if WithSingleClient is provided.
func WithExtraEndpoints(endpoints []string) Option {
return func(c *cfg) {
c.extraEndpoints = append(c.extraEndpoints, endpoints...)
}
}
// WithMaxConnectionPerHost returns a client constructor
// option that specifies Neo client's maximum opened
// connection per one host.
func WithMaxConnectionPerHost(m int) Option {
return func(c *cfg) {
c.maxConnPerHost = m
}
}
// WithSingleClient returns a client constructor option
// that specifies single neo-go client and forces Client
// to use it and only it for requests.
//
// Passed client must already be initialized.
func WithSingleClient(cli *client.Client) Option {
return func(c *cfg) {
c.singleCli = cli
}
}