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84 lines
3.3 KiB
Go
84 lines
3.3 KiB
Go
package event
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import (
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"github.com/libp2p/go-libp2p/core/record"
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ma "github.com/multiformats/go-multiaddr"
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)
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// AddrAction represents an action taken on one of a Host's listen addresses.
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// It is used to add context to address change events in EvtLocalAddressesUpdated.
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type AddrAction int
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const (
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// Unknown means that the event producer was unable to determine why the address
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// is in the current state.
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Unknown AddrAction = iota
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// Added means that the address is new and was not present prior to the event.
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Added
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// Maintained means that the address was not altered between the current and
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// previous states.
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Maintained
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// Removed means that the address was removed from the Host.
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Removed
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)
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// UpdatedAddress is used in the EvtLocalAddressesUpdated event to convey
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// address change information.
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type UpdatedAddress struct {
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// Address contains the address that was updated.
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Address ma.Multiaddr
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// Action indicates what action was taken on the address during the
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// event. May be Unknown if the event producer cannot produce diffs.
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Action AddrAction
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}
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// EvtLocalAddressesUpdated should be emitted when the set of listen addresses for
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// the local host changes. This may happen for a number of reasons. For example,
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// we may have opened a new relay connection, established a new NAT mapping via
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// UPnP, or been informed of our observed address by another peer.
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//
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// EvtLocalAddressesUpdated contains a snapshot of the current listen addresses,
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// and may also contain a diff between the current state and the previous state.
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// If the event producer is capable of creating a diff, the Diffs field will be
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// true, and event consumers can inspect the Action field of each UpdatedAddress
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// to see how each address was modified.
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//
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// For example, the Action will tell you whether an address in
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// the Current list was Added by the event producer, or was Maintained without
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// changes. Addresses that were removed from the Host will have the AddrAction
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// of Removed, and will be in the Removed list.
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//
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// If the event producer is not capable or producing diffs, the Diffs field will
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// be false, the Removed list will always be empty, and the Action for each
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// UpdatedAddress in the Current list will be Unknown.
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//
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// In addition to the above, EvtLocalAddressesUpdated also contains the updated peer.PeerRecord
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// for the Current set of listen addresses, wrapped in a record.Envelope and signed by the Host's private key.
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// This record can be shared with other peers to inform them of what we believe are our diallable addresses
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// a secure and authenticated way.
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type EvtLocalAddressesUpdated struct {
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// Diffs indicates whether this event contains a diff of the Host's previous
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// address set.
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Diffs bool
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// Current contains all current listen addresses for the Host.
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// If Diffs == true, the Action field of each UpdatedAddress will tell
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// you whether an address was Added, or was Maintained from the previous
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// state.
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Current []UpdatedAddress
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// Removed contains addresses that were removed from the Host.
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// This field is only set when Diffs == true.
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Removed []UpdatedAddress
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// SignedPeerRecord contains our own updated peer.PeerRecord, listing the addresses enumerated in Current.
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// wrapped in a record.Envelope and signed by the Host's private key.
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SignedPeerRecord *record.Envelope
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}
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