adapters

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 Go to latest Published: Jun 21, 2022 License: GPL-3.0 Imports: 30 Imported by: 3

Documentation

Overview

Copyright 2017 The Spectrum Authors This file is part of the Spectrum library.

The Spectrum library is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

The Spectrum library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with the Spectrum library. If not, see <http://www.gnu.org/licenses/>.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func RegisterServices 

func RegisterServices(services Services)

RegisterServices registers the given Services which can then be used to start devp2p nodes using either the Exec or Docker adapters.

It should be called in an init function so that it has the opportunity to execute the services before main() is called.

Types

type DockerAdapter 

type DockerAdapter struct {
	ExecAdapter
}

DockerAdapter is a NodeAdapter which runs simulation nodes inside Docker containers.

A Docker image is built which contains the current binary at /bin/p2p-node which when executed runs the underlying service (see the description of the execP2PNode function for more details)

func NewDockerAdapter 

func NewDockerAdapter() (*DockerAdapter, error)

NewDockerAdapter builds the p2p-node Docker image containing the current binary and returns a DockerAdapter

func (*DockerAdapter) Name 

func (d *DockerAdapter) Name() string

Name returns the name of the adapter for logging purposes

func (*DockerAdapter) NewNode 

func (d *DockerAdapter) NewNode(config *NodeConfig) (Node, error)

NewNode returns a new DockerNode using the given config

type DockerNode 

type DockerNode struct {
	ExecNode
}

DockerNode wraps an ExecNode but exec's the current binary in a docker container rather than locally

type ExecAdapter 

type ExecAdapter struct {
	// BaseDir is the directory under which the data directories for each
	// simulation node are created.
	BaseDir string
	// contains filtered or unexported fields
}

ExecAdapter is a NodeAdapter which runs simulation nodes by executing the current binary as a child process.

An init hook is used so that the child process executes the node services (rather than whataver the main() function would normally do), see the execP2PNode function for more information.

func NewExecAdapter 

func NewExecAdapter(baseDir string) *ExecAdapter

NewExecAdapter returns an ExecAdapter which stores node data in subdirectories of the given base directory

func (*ExecAdapter) Name 

func (e *ExecAdapter) Name() string

Name returns the name of the adapter for logging purposes

func (*ExecAdapter) NewNode 

func (e *ExecAdapter) NewNode(config *NodeConfig) (Node, error)

NewNode returns a new ExecNode using the given config

type ExecNode 

type ExecNode struct {
	ID     discover.NodeID
	Dir    string
	Config *execNodeConfig
	Cmd    *exec.Cmd
	Info   *p2p.NodeInfo
	// contains filtered or unexported fields
}

ExecNode starts a simulation node by exec'ing the current binary and running the configured services

func (*ExecNode) Addr 

func (n *ExecNode) Addr() []byte

Addr returns the node's enode URL

func (*ExecNode) Client 

func (n *ExecNode) Client() (*rpc.Client, error)

Client returns an rpc.Client which can be used to communicate with the underlying services (it is set once the node has started)

func (*ExecNode) NodeInfo 

func (n *ExecNode) NodeInfo() *p2p.NodeInfo

NodeInfo returns information about the node

func (*ExecNode) ServeRPC 

func (n *ExecNode) ServeRPC(clientConn net.Conn) error

ServeRPC serves RPC requests over the given connection by dialling the node's WebSocket address and joining the two connections

func (*ExecNode) Snapshots 

func (n *ExecNode) Snapshots() (map[string][]byte, error)

Snapshots creates snapshots of the services by calling the simulation_snapshot RPC method

func (*ExecNode) Start 

func (n *ExecNode) Start(snapshots map[string][]byte) (err error)

Start exec's the node passing the ID and service as command line arguments and the node config encoded as JSON in the _P2P_NODE_CONFIG environment variable

func (*ExecNode) Stop 

func (n *ExecNode) Stop() error

Stop stops the node by first sending SIGTERM and then SIGKILL if the node doesn't stop within 5s

type Node 

type Node interface {
	// Addr returns the node's address (e.g. an Enode URL)
	Addr() []byte

	// Client returns the RPC client which is created once the node is
	// up and running
	Client() (*rpc.Client, error)

	// ServeRPC serves RPC requests over the given connection
	ServeRPC(net.Conn) error

	// Start starts the node with the given snapshots
	Start(snapshots map[string][]byte) error

	// Stop stops the node
	Stop() error

	// NodeInfo returns information about the node
	NodeInfo() *p2p.NodeInfo

	// Snapshots creates snapshots of the running services
	Snapshots() (map[string][]byte, error)
}

Node represents a node in a simulation network which is created by a NodeAdapter, for example:

* SimNode - An in-memory node * ExecNode - A child process node * DockerNode - A Docker container node

type NodeAdapter 

type NodeAdapter interface {
	// Name returns the name of the adapter for logging purposes
	Name() string

	// NewNode creates a new node with the given configuration
	NewNode(config *NodeConfig) (Node, error)
}

NodeAdapter is used to create Nodes in a simulation network

type NodeConfig 

type NodeConfig struct {
	// ID is the node's ID which is used to identify the node in the
	// simulation network
	ID discover.NodeID

	// PrivateKey is the node's private key which is used by the devp2p
	// stack to encrypt communications
	PrivateKey *ecdsa.PrivateKey

	// Enable peer events for Msgs
	EnableMsgEvents bool

	// Name is a human friendly name for the node like "node01"
	Name string

	// Services are the names of the services which should be run when
	// starting the node (for SimNodes it should be the names of services
	// contained in SimAdapter.services, for other nodes it should be
	// services registered by calling the RegisterService function)
	Services []string

	// function to sanction or prevent suggesting a peer
	Reachable func(id discover.NodeID) bool
}

NodeConfig is the configuration used to start a node in a simulation network

func RandomNodeConfig 

func RandomNodeConfig() *NodeConfig

RandomNodeConfig returns node configuration with a randomly generated ID and PrivateKey

func (*NodeConfig) MarshalJSON 

func (n *NodeConfig) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface by encoding the config fields as strings

func (*NodeConfig) UnmarshalJSON 

func (n *NodeConfig) UnmarshalJSON(data []byte) error

UnmarshalJSON implements the json.Unmarshaler interface by decoding the json string values into the config fields

type RPCDialer 

type RPCDialer interface {
	DialRPC(id discover.NodeID) (*rpc.Client, error)
}

RPCDialer is used when initialising services which need to connect to other nodes in the network (for example a simulated Swarm node which needs to connect to a Geth node to resolve ENS names)

type ServiceContext 

type ServiceContext struct {
	RPCDialer

	NodeContext *node.ServiceContext
	Config      *NodeConfig
	Snapshot    []byte
}

ServiceContext is a collection of options and methods which can be utilised when starting services

type ServiceFunc 

type ServiceFunc func(ctx *ServiceContext) (node.Service, error)

ServiceFunc returns a node.Service which can be used to boot a devp2p node

type Services 

type Services map[string]ServiceFunc

Services is a collection of services which can be run in a simulation

type SimAdapter 

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

SimAdapter is a NodeAdapter which creates in-memory simulation nodes and connects them using in-memory net.Pipe connections

func NewSimAdapter 

func NewSimAdapter(services map[string]ServiceFunc) *SimAdapter

NewSimAdapter creates a SimAdapter which is capable of running in-memory simulation nodes running any of the given services (the services to run on a particular node are passed to the NewNode function in the NodeConfig)

func (*SimAdapter) Dial 

func (s *SimAdapter) Dial(dest *discover.Node) (conn net.Conn, err error)

Dial implements the p2p.NodeDialer interface by connecting to the node using an in-memory net.Pipe connection

func (*SimAdapter) DialRPC 

func (s *SimAdapter) DialRPC(id discover.NodeID) (*rpc.Client, error)

DialRPC implements the RPCDialer interface by creating an in-memory RPC client of the given node

func (*SimAdapter) GetNode 

func (s *SimAdapter) GetNode(id discover.NodeID) (*SimNode, bool)

GetNode returns the node with the given ID if it exists

func (*SimAdapter) Name 

func (s *SimAdapter) Name() string

Name returns the name of the adapter for logging purposes

func (*SimAdapter) NewNode 

func (s *SimAdapter) NewNode(config *NodeConfig) (Node, error)

NewNode returns a new SimNode using the given config

type SimNode 

type SimNode struct {
	ID discover.NodeID
	// contains filtered or unexported fields
}

SimNode is an in-memory simulation node which connects to other nodes using an in-memory net.Pipe connection (see SimAdapter.Dial), running devp2p protocols directly over that pipe

func (*SimNode) Addr 

func (self *SimNode) Addr() []byte

Addr returns the node's discovery address

func (*SimNode) Client 

func (self *SimNode) Client() (*rpc.Client, error)

Client returns an rpc.Client which can be used to communicate with the underlying services (it is set once the node has started)

func (*SimNode) Node 

func (self *SimNode) Node() *discover.Node

Node returns a discover.Node representing the SimNode

func (*SimNode) NodeInfo 

func (self *SimNode) NodeInfo() *p2p.NodeInfo

NodeInfo returns information about the node

func (*SimNode) ServeRPC 

func (self *SimNode) ServeRPC(conn net.Conn) error

ServeRPC serves RPC requests over the given connection by creating an in-memory client to the node's RPC server

func (*SimNode) Server 

func (self *SimNode) Server() *p2p.Server

Server returns the underlying p2p.Server

func (*SimNode) Services 

func (self *SimNode) Services() []node.Service

Services returns a copy of the underlying services

func (*SimNode) Snapshots 

func (self *SimNode) Snapshots() (map[string][]byte, error)

Snapshots creates snapshots of the services by calling the simulation_snapshot RPC method

func (*SimNode) Start 

func (self *SimNode) Start(snapshots map[string][]byte) error

Start registers the services and starts the underlying devp2p node

func (*SimNode) Stop 

func (self *SimNode) Stop() error

Stop closes the RPC client and stops the underlying devp2p node

func (*SimNode) SubscribeEvents 

func (self *SimNode) SubscribeEvents(ch chan *p2p.PeerEvent) event.Subscription

SubscribeEvents subscribes the given channel to peer events from the underlying p2p.Server

type SimStateStore 

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

func NewSimStateStore 

func NewSimStateStore() *SimStateStore

func (*SimStateStore) Load 

func (self *SimStateStore) Load(s string) ([]byte, error)

func (*SimStateStore) Save 

func (self *SimStateStore) Save(s string, data []byte) error

type SnapshotAPI 

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

SnapshotAPI provides an RPC method to create snapshots of services

func (SnapshotAPI) Snapshot 

func (api SnapshotAPI) Snapshot() (map[string][]byte, error)

Source Files

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