0x-mesh: github.com/0xProject/0x-mesh/core Index | Files | Directories

package core

import "github.com/0xProject/0x-mesh/core"

Package core contains everything needed to configure and run a 0x Mesh node.


Package Files

core.go eth_rpc_chain_id.go message_handler.go ordersync_subprotocols.go peer_score.go

type App Uses

type App struct {
    // contains filtered or unexported fields

func New Uses

func New(config Config) (*App, error)

func (*App) AddOrders Uses

func (app *App) AddOrders(ctx context.Context, signedOrdersRaw []*json.RawMessage, pinned bool) (*ordervalidator.ValidationResults, error)

AddOrders can be used to add orders to Mesh. It validates the given orders and if they are valid, will store and eventually broadcast the orders to peers. If pinned is true, the orders will be marked as pinned, which means they will only be removed if they become unfillable and will not be removed due to having a high expiration time or any incentive mechanisms.

func (*App) AddPeer Uses

func (app *App) AddPeer(peerInfo peerstore.PeerInfo) error

AddPeer can be used to manually connect to a new peer.

func (*App) GetOrders Uses

func (app *App) GetOrders(page, perPage int, snapshotID string) (*types.GetOrdersResponse, error)

GetOrders retrieves paginated orders from the Mesh DB at a specific snapshot in time. Passing an empty string as `snapshotID` creates a new snapshot and returns the first set of results. To fetch all orders, continue to make requests supplying the `snapshotID` returned from the first request. After 1 minute of not received further requests referencing a specific snapshot, the snapshot expires and can no longer be used.

func (*App) GetStats Uses

func (app *App) GetStats() (*types.Stats, error)

GetStats retrieves stats about the Mesh node

func (*App) HandleMessages Uses

func (app *App) HandleMessages(ctx context.Context, messages []*p2p.Message) error

func (*App) IsCaughtUpToLatestBlock Uses

func (app *App) IsCaughtUpToLatestBlock(ctx context.Context) bool

IsCaughtUpToLatestBlock returns whether or not the latest block stored by Mesh corresponds to the latest block retrieved from it's Ethereum RPC endpoint

func (*App) Start Uses

func (app *App) Start(ctx context.Context) error

func (*App) SubscribeToOrderEvents Uses

func (app *App) SubscribeToOrderEvents(sink chan<- []*zeroex.OrderEvent) event.Subscription

SubscribeToOrderEvents let's one subscribe to order events emitted by the OrderWatcher

type Config Uses

type Config struct {
    // Verbosity is the logging verbosity: 0=panic, 1=fatal, 2=error, 3=warn, 4=info, 5=debug 6=trace
    Verbosity int `envvar:"VERBOSITY" default:"2"`
    // DataDir is the directory to use for persisting all data, including the
    // database and private key files.
    DataDir string `envvar:"DATA_DIR" default:"0x_mesh"`
    // P2PTCPPort is the port on which to listen for new TCP connections from
    // peers in the network. Set to 60558 by default.
    P2PTCPPort int `envvar:"P2P_TCP_PORT" default:"60558"`
    // P2PWebSocketsPort is the port on which to listen for new WebSockets
    // connections from peers in the network. Set to 60559 by default.
    P2PWebSocketsPort int `envvar:"P2P_WEBSOCKETS_PORT" default:"60559"`
    // EthereumRPCURL is the URL of an Etheruem node which supports the JSON RPC
    // API.
    EthereumRPCURL string `envvar:"ETHEREUM_RPC_URL" json:"-"`
    // EthereumChainID is the chain ID specifying which Ethereum chain you wish to
    // run your Mesh node for
    EthereumChainID int `envvar:"ETHEREUM_CHAIN_ID"`
    // UseBootstrapList is whether to bootstrap the DHT by connecting to a
    // specific set of peers.
    UseBootstrapList bool `envvar:"USE_BOOTSTRAP_LIST" default:"true"`
    // BootstrapList is a comma-separated list of multiaddresses to use for
    // bootstrapping the DHT (e.g.,
    // "/ip4/").
    // If empty, the default bootstrap list will be used.
    BootstrapList string `envvar:"BOOTSTRAP_LIST" default:""`
    // BlockPollingInterval is the polling interval to wait before checking for a new Ethereum block
    // that might contain transactions that impact the fillability of orders stored by Mesh. Different
    // chains have different block producing intervals: POW chains are typically slower (e.g., Mainnet)
    // and POA chains faster (e.g., Kovan) so one should adjust the polling interval accordingly.
    BlockPollingInterval time.Duration `envvar:"BLOCK_POLLING_INTERVAL" default:"5s"`
    // EthereumRPCMaxContentLength is the maximum request Content-Length accepted by the backing Ethereum RPC
    // endpoint used by Mesh. Geth & Infura both limit a request's content length to 1024 * 512 Bytes. Parity
    // and Alchemy have much higher limits. When batch validating 0x orders, we will fit as many orders into a
    // request without crossing the max content length. The default value is appropriate for operators using Geth
    // or Infura. If using Alchemy or Parity, feel free to double the default max in order to reduce the
    // number of RPC calls made by Mesh.
    EthereumRPCMaxContentLength int `envvar:"ETHEREUM_RPC_MAX_CONTENT_LENGTH" default:"524288"`
    // EnableEthereumRPCRateLimiting determines whether or not Mesh should limit
    // the number of Ethereum RPC requests it sends. It defaults to true.
    // Disabling Ethereum RPC rate limiting can reduce latency for receiving order
    // events in some network conditions, but can also potentially lead to higher
    // costs or other rate limiting issues outside of Mesh, depending on your
    // Ethereum RPC provider. If set to false, ethereumRPCMaxRequestsPer24HrUTC
    // and ethereumRPCMaxRequestsPerSecond will have no effect.
    EnableEthereumRPCRateLimiting bool `envvar:"ENABLE_ETHEREUM_RPC_RATE_LIMITING" default:"true"`
    // EthereumRPCMaxRequestsPer24HrUTC caps the number of Ethereum JSON-RPC requests a Mesh node will make
    // per 24hr UTC time window (time window starts and ends at midnight UTC). It defaults to 200k but
    // can be increased well beyond this limit depending on your infrastructure or Ethereum RPC provider.
    EthereumRPCMaxRequestsPer24HrUTC int `envvar:"ETHEREUM_RPC_MAX_REQUESTS_PER_24_HR_UTC" default:"200000"`
    // EthereumRPCMaxRequestsPerSecond caps the number of Ethereum JSON-RPC requests a Mesh node will make per
    // second. This limits the concurrency of these requests and prevents the Mesh node from getting rate-limited.
    // It defaults to the recommended 30 rps for Infura's free tier, and can be increased to 100 rpc for pro users,
    // and potentially higher on alternative infrastructure.
    EthereumRPCMaxRequestsPerSecond float64 `envvar:"ETHEREUM_RPC_MAX_REQUESTS_PER_SECOND" default:"30"`
    // CustomContractAddresses is a JSON-encoded string representing a set of
    // custom addresses to use for the configured chain ID. The contract
    // addresses for most common chains/networks are already included by default, so this
    // is typically only needed for testing on custom chains/networks. The given
    // addresses are added to the default list of addresses for known chains/networks and
    // overriding any contract addresses for known chains/networks is not allowed. The
    // addresses for exchange, devUtils, erc20Proxy, erc721Proxy and erc1155Proxy are required
    // for each chain/network. For example:
    //    {
    //        "exchange":"0x48bacb9266a570d521063ef5dd96e61686dbe788",
    //        "devUtils": "0x38ef19fdf8e8415f18c307ed71967e19aac28ba1",
    //        "erc20Proxy": "0x1dc4c1cefef38a777b15aa20260a54e584b16c48",
    //        "erc721Proxy": "0x1d7022f5b17d2f8b695918fb48fa1089c9f85401",
    //        "erc1155Proxy": "0x64517fa2b480ba3678a2a3c0cf08ef7fd4fad36f"
    //    }
    CustomContractAddresses string `envvar:"CUSTOM_CONTRACT_ADDRESSES" default:""`
    // MaxOrdersInStorage is the maximum number of orders that Mesh will keep in
    // storage. As the number of orders in storage grows, Mesh will begin
    // enforcing a limit on maximum expiration time for incoming orders and remove
    // any orders with an expiration time too far in the future.
    MaxOrdersInStorage int `envvar:"MAX_ORDERS_IN_STORAGE" default:"100000"`
    // CustomOrderFilter is a stringified JSON Schema which will be used for
    // validating incoming orders. If provided, Mesh will only receive orders from
    // other peers in the network with the same filter.
    // Here is an example filter which will only allow orders with a specific
    // makerAssetData:
    //    {
    //        "properties": {
    //            "makerAssetData": {
    //                "const": "0xf47261b0000000000000000000000000871dd7c2b4b25e1aa18728e9d5f2af4c4e431f5c"
    //            }
    //        }
    //    }
    // Note that you only need to include the requirements for your specific
    // application in the filter. The default requirements for a valid order (e.g.
    // all the required fields) are automatically included. For more information
    // on JSON Schemas, see https://json-schema.org/
    CustomOrderFilter string `envvar:"CUSTOM_ORDER_FILTER" default:"{}"`
    // EthereumRPCClient is the client to use for all Ethereum RPC reuqests. It is only
    // settable in browsers and cannot be set via environment variable. If
    // provided, EthereumRPCURL will be ignored.
    EthereumRPCClient ethclient.RPCClient `envvar:"-"`

Config is a set of configuration options for 0x Mesh.

type ErrPerPageZero Uses

type ErrPerPageZero struct{}

ErrPerPageZero is the error returned when a GetOrders request specifies perPage to 0

func (ErrPerPageZero) Error Uses

func (e ErrPerPageZero) Error() string

type ErrSnapshotNotFound Uses

type ErrSnapshotNotFound struct {
    // contains filtered or unexported fields

ErrSnapshotNotFound is the error returned when a snapshot not found with a particular id

func (ErrSnapshotNotFound) Error Uses

func (e ErrSnapshotNotFound) Error() string

type FilteredPaginationRequestMetadata Uses

type FilteredPaginationRequestMetadata struct {
    Page        int                 `json:"page"`
    SnapshotID  string              `json:"snapshotID"`
    OrderFilter *orderfilter.Filter `json:"orderfilter"`

FilteredPaginationRequestMetadata is the request metadata for the FilteredPaginationSubProtocol. It keeps track of the current page and SnapshotID, which is expected to be an empty string on the first request.

type FilteredPaginationResponseMetadata Uses

type FilteredPaginationResponseMetadata struct {
    Page       int    `json:"page"`
    SnapshotID string `json:"snapshotID"`

FilteredPaginationResponseMetadata is the response metadata for the FilteredPaginationSubProtocol. It keeps track of the current page and SnapshotID.

type FilteredPaginationSubProtocol Uses

type FilteredPaginationSubProtocol struct {
    // contains filtered or unexported fields

FilteredPaginationSubProtocol is an ordersync subprotocol which returns all orders by paginating through them. It involves sending multiple requests until pagination is finished and all orders have been returned.

func NewFilteredPaginationSubprotocol Uses

func NewFilteredPaginationSubprotocol(app *App, perPage int) *FilteredPaginationSubProtocol

NewFilteredPaginationSubprotocol creates and returns a new FilteredPaginationSubprotocol which will respond with perPage orders for each individual request/response.

func (*FilteredPaginationSubProtocol) GenerateFirstRequestMetadata Uses

func (p *FilteredPaginationSubProtocol) GenerateFirstRequestMetadata() (json.RawMessage, error)

func (*FilteredPaginationSubProtocol) HandleOrderSyncRequest Uses

func (p *FilteredPaginationSubProtocol) HandleOrderSyncRequest(ctx context.Context, req *ordersync.Request) (*ordersync.Response, error)

HandleOrderSyncRequest returns the orders for one page, based on the page number and snapshotID corresponding to the given request. This is the implementation for the "provider" side of the subprotocol.

func (*FilteredPaginationSubProtocol) HandleOrderSyncResponse Uses

func (p *FilteredPaginationSubProtocol) HandleOrderSyncResponse(ctx context.Context, res *ordersync.Response) (*ordersync.Request, error)

HandleOrderSyncResponse handles the orders for one page by validating them, storing them in the database, and firing the appropriate events. It also returns the next request to be sent. This is the implementation for the "requester" side of the subprotocol.

func (*FilteredPaginationSubProtocol) Name Uses

func (p *FilteredPaginationSubProtocol) Name() string

Name returns the name of the FilteredPaginationSubProtocol

func (*FilteredPaginationSubProtocol) ParseRequestMetadata Uses

func (p *FilteredPaginationSubProtocol) ParseRequestMetadata(metadata json.RawMessage) (interface{}, error)

func (*FilteredPaginationSubProtocol) ParseResponseMetadata Uses

func (p *FilteredPaginationSubProtocol) ParseResponseMetadata(metadata json.RawMessage) (interface{}, error)


ordersyncPackage ordersync contains the ordersync protocol, which is used for sharing existing orders between two peers, typically during initialization.

Package core imports 43 packages (graph) and is imported by 1 packages. Updated 2020-08-05. Refresh now. Tools for package owners.