77 lines
3.2 KiB
Go
77 lines
3.2 KiB
Go
package dht
|
|
|
|
import (
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/lbryio/lbry.go/v2/dht/bits"
|
|
)
|
|
|
|
const (
|
|
Network = "udp4"
|
|
DefaultPort = 4444
|
|
DefaultPeerPort = 3333
|
|
|
|
DefaultAnnounceRate = 10 // send at most this many announces per second
|
|
DefaultReannounceTime = 50 * time.Minute // should be a bit less than hash expiration time
|
|
|
|
// TODO: all these constants should be defaults, and should be used to set values in the standard Config. then the code should use values in the config
|
|
// TODO: alternatively, have a global Config for constants. at least that way tests can modify the values
|
|
alpha = 3 // this is the constant alpha in the spec
|
|
bucketSize = 8 // this is the constant k in the spec
|
|
nodeIDLength = bits.NumBytes // bytes. this is the constant B in the spec
|
|
messageIDLength = 20 // bytes.
|
|
|
|
udpRetry = 1
|
|
udpTimeout = 5 * time.Second
|
|
udpMaxMessageLength = 4096 // bytes. I think our longest message is ~676 bytes, so I rounded up to 1024
|
|
// scratch that. a findValue could return more than K results if a lot of nodes are storing that value, so we need more buffer
|
|
|
|
maxPeerFails = 3 // after this many failures, a peer is considered bad and will be removed from the routing table
|
|
//tExpire = 60 * time.Minute // the time after which a key/value pair expires; this is a time-to-live (TTL) from the original publication date
|
|
tRefresh = 1 * time.Hour // the time after which an otherwise unaccessed bucket must be refreshed
|
|
//tReplicate = 1 * time.Hour // the interval between Kademlia replication events, when a node is required to publish its entire database
|
|
//tNodeRefresh = 15 * time.Minute // the time after which a good node becomes questionable if it has not messaged us
|
|
|
|
compactNodeInfoLength = nodeIDLength + 6 // nodeID + 4 for IP + 2 for port
|
|
|
|
tokenSecretRotationInterval = 5 * time.Minute // how often the token-generating secret is rotated
|
|
)
|
|
|
|
// Config represents the configure of dht.
|
|
type Config struct {
|
|
// this node's address. format is `ip:port`
|
|
Address string
|
|
// the seed nodes through which we can join in dht network
|
|
SeedNodes []string
|
|
// the hex-encoded node id for this node. if string is empty, a random id will be generated
|
|
NodeID string
|
|
// print the state of the dht every X time
|
|
PrintState time.Duration
|
|
// the port that clients can use to download blobs using the LBRY peer protocol
|
|
PeerProtocolPort int
|
|
// if nonzero, an RPC server will listen to requests on this port and respond to them
|
|
RPCPort int
|
|
// the time after which the original publisher must reannounce a key/value pair
|
|
ReannounceTime time.Duration
|
|
// send at most this many announces per second
|
|
AnnounceRate int
|
|
// channel that will receive notifications about announcements
|
|
AnnounceNotificationCh chan announceNotification
|
|
}
|
|
|
|
// NewStandardConfig returns a Config pointer with default values.
|
|
func NewStandardConfig() *Config {
|
|
return &Config{
|
|
Address: "0.0.0.0:" + strconv.Itoa(DefaultPort),
|
|
SeedNodes: []string{
|
|
"lbrynet1.lbry.com:4444",
|
|
"lbrynet2.lbry.com:4444",
|
|
"lbrynet3.lbry.com:4444",
|
|
"lbrynet4.lbry.com:4444",
|
|
},
|
|
PeerProtocolPort: DefaultPeerPort,
|
|
ReannounceTime: DefaultReannounceTime,
|
|
AnnounceRate: DefaultAnnounceRate,
|
|
}
|
|
}
|