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34 lines
1.8 KiB
34 lines
1.8 KiB
/*
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Package PEX (Peer exchange) handles all the logic necessary for nodes to share
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information about their peers to other nodes. Specifically, this is the exchange
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of addresses that a peer can use to discover more peers within the network.
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The PEX reactor is a continuous service which periodically requests addresses
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and serves addresses to other peers. There are two versions of this service
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aligning with the two p2p frameworks that Tendermint currently supports.
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V1 is coupled with the Switch (which handles peer connections and routing of
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messages) and, alongside exchanging peer information in the form of port/IP
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pairs, also has the responsibility of dialing peers and ensuring that a
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node has a sufficient amount of peers connected.
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V2 is embedded with the new p2p stack and uses the peer manager to advertise
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peers as well as add new peers to the peer store. The V2 reactor passes a
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different set of proto messages which include a list of
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[urls](https://golang.org/pkg/net/url/#URL).These can be used to save a set of
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endpoints that each peer uses. The V2 reactor has backwards compatibility with
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V1. It can also handle V1 messages.
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The V2 reactor is able to tweak the intensity of it's search by decreasing or
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increasing the interval between each request. It tracks connected peers via a
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linked list, sending a request to the node at the front of the list and adding
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it to the back of the list once a response is received. Using this method, a
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node is able to spread out the load of requesting peers across all the peers it
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is currently connected with.
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With each inbound set of addresses, the reactor monitors the amount of new
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addresses to already seen addresses and uses the information to dynamically
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build a picture of the size of the network in order to ascertain how often the
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node needs to search for new peers.
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*/
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package pex
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