112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package simulations
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import (
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"fmt"
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"time"
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)
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// EventType is the type of event emitted by a simulation network
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type EventType string
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const (
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// EventTypeNode is the type of event emitted when a node is either
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// created, started or stopped
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EventTypeNode EventType = "node"
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// EventTypeConn is the type of event emitted when a connection is
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// is either established or dropped between two nodes
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EventTypeConn EventType = "conn"
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// EventTypeMsg is the type of event emitted when a p2p message it
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// sent between two nodes
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EventTypeMsg EventType = "msg"
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)
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// Event is an event emitted by a simulation network
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type Event struct {
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// Type is the type of the event
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Type EventType `json:"type"`
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// Time is the time the event happened
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Time time.Time `json:"time"`
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// Control indicates whether the event is the result of a controlled
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// action in the network
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Control bool `json:"control"`
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// Node is set if the type is EventTypeNode
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Node *Node `json:"node,omitempty"`
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// Conn is set if the type is EventTypeConn
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Conn *Conn `json:"conn,omitempty"`
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// Msg is set if the type is EventTypeMsg
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Msg *Msg `json:"msg,omitempty"`
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//Optionally provide data (currently for simulation frontends only)
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Data interface{} `json:"data"`
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}
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// NewEvent creates a new event for the given object which should be either a
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// Node, Conn or Msg.
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//
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// The object is copied so that the event represents the state of the object
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// when NewEvent is called.
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func NewEvent(v interface{}) *Event {
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event := &Event{Time: time.Now()}
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switch v := v.(type) {
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case *Node:
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event.Type = EventTypeNode
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node := *v
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event.Node = &node
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case *Conn:
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event.Type = EventTypeConn
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conn := *v
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event.Conn = &conn
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case *Msg:
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event.Type = EventTypeMsg
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msg := *v
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event.Msg = &msg
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default:
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panic(fmt.Sprintf("invalid event type: %T", v))
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}
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return event
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}
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// ControlEvent creates a new control event
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func ControlEvent(v interface{}) *Event {
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event := NewEvent(v)
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event.Control = true
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return event
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}
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// String returns the string representation of the event
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func (e *Event) String() string {
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switch e.Type {
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case EventTypeNode:
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return fmt.Sprintf("<node-event> id: %s up: %t", e.Node.ID().TerminalString(), e.Node.Up())
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case EventTypeConn:
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return fmt.Sprintf("<conn-event> nodes: %s->%s up: %t", e.Conn.One.TerminalString(), e.Conn.Other.TerminalString(), e.Conn.Up)
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case EventTypeMsg:
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return fmt.Sprintf("<msg-event> nodes: %s->%s proto: %s, code: %d, received: %t", e.Msg.One.TerminalString(), e.Msg.Other.TerminalString(), e.Msg.Protocol, e.Msg.Code, e.Msg.Received)
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default:
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return ""
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}
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}
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