mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-26 16:45:18 +00:00
110 lines
4.0 KiB
Go
110 lines
4.0 KiB
Go
package connmgr
|
|
|
|
import (
|
|
"io"
|
|
"time"
|
|
|
|
"github.com/libp2p/go-libp2p/core/peer"
|
|
)
|
|
|
|
// Decayer is implemented by connection managers supporting decaying tags. A
|
|
// decaying tag is one whose value automatically decays over time.
|
|
//
|
|
// The actual application of the decay behaviour is encapsulated in a
|
|
// user-provided decaying function (DecayFn). The function is called on every
|
|
// tick (determined by the interval parameter), and returns either the new value
|
|
// of the tag, or whether it should be erased altogether.
|
|
//
|
|
// We do not set values on a decaying tag. Rather, we "bump" decaying tags by a
|
|
// delta. This calls the BumpFn with the old value and the delta, to determine
|
|
// the new value.
|
|
//
|
|
// Such a pluggable design affords a great deal of flexibility and versatility.
|
|
// Behaviours that are straightforward to implement include:
|
|
//
|
|
// - Decay a tag by -1, or by half its current value, on every tick.
|
|
// - Every time a value is bumped, sum it to its current value.
|
|
// - Exponentially boost a score with every bump.
|
|
// - Sum the incoming score, but keep it within min, max bounds.
|
|
//
|
|
// Commonly used DecayFns and BumpFns are provided in this package.
|
|
type Decayer interface {
|
|
io.Closer
|
|
|
|
// RegisterDecayingTag creates and registers a new decaying tag, if and only
|
|
// if a tag with the supplied name doesn't exist yet. Otherwise, an error is
|
|
// returned.
|
|
//
|
|
// The caller provides the interval at which the tag is refreshed, as well
|
|
// as the decay function and the bump function. Refer to godocs on DecayFn
|
|
// and BumpFn for more info.
|
|
RegisterDecayingTag(name string, interval time.Duration, decayFn DecayFn, bumpFn BumpFn) (DecayingTag, error)
|
|
}
|
|
|
|
// DecayFn applies a decay to the peer's score. The implementation must call
|
|
// DecayFn at the interval supplied when registering the tag.
|
|
//
|
|
// It receives a copy of the decaying value, and returns the score after
|
|
// applying the decay, as well as a flag to signal if the tag should be erased.
|
|
type DecayFn func(value DecayingValue) (after int, rm bool)
|
|
|
|
// BumpFn applies a delta onto an existing score, and returns the new score.
|
|
//
|
|
// Non-trivial bump functions include exponential boosting, moving averages,
|
|
// ceilings, etc.
|
|
type BumpFn func(value DecayingValue, delta int) (after int)
|
|
|
|
// DecayingTag represents a decaying tag. The tag is a long-lived general
|
|
// object, used to operate on tag values for peers.
|
|
type DecayingTag interface {
|
|
// Name returns the name of the tag.
|
|
Name() string
|
|
|
|
// Interval is the effective interval at which this tag will tick. Upon
|
|
// registration, the desired interval may be overwritten depending on the
|
|
// decayer's resolution, and this method allows you to obtain the effective
|
|
// interval.
|
|
Interval() time.Duration
|
|
|
|
// Bump applies a delta to a tag value, calling its bump function. The bump
|
|
// will be applied asynchronously, and a non-nil error indicates a fault
|
|
// when queuing.
|
|
Bump(peer peer.ID, delta int) error
|
|
|
|
// Remove removes a decaying tag from a peer. The removal will be applied
|
|
// asynchronously, and a non-nil error indicates a fault when queuing.
|
|
Remove(peer peer.ID) error
|
|
|
|
// Close closes a decaying tag. The Decayer will stop tracking this tag,
|
|
// and the state of all peers in the Connection Manager holding this tag
|
|
// will be updated.
|
|
//
|
|
// The deletion is performed asynchronously.
|
|
//
|
|
// Once deleted, a tag should not be used, and further calls to Bump/Remove
|
|
// will error.
|
|
//
|
|
// Duplicate calls to Remove will not return errors, but a failure to queue
|
|
// the first actual removal, will (e.g. when the system is backlogged).
|
|
Close() error
|
|
}
|
|
|
|
// DecayingValue represents a value for a decaying tag.
|
|
type DecayingValue struct {
|
|
// Tag points to the tag this value belongs to.
|
|
Tag DecayingTag
|
|
|
|
// Peer is the peer ID to whom this value is associated.
|
|
Peer peer.ID
|
|
|
|
// Added is the timestamp when this value was added for the first time for
|
|
// a tag and a peer.
|
|
Added time.Time
|
|
|
|
// LastVisit is the timestamp of the last visit.
|
|
LastVisit time.Time
|
|
|
|
// Value is the current value of the tag.
|
|
Value int
|
|
}
|