7569b7d71b
* wires up first draft of lifecycle methods * creates interface on transport * node lifecycle hooks works * linter fixes * adds error log at connection success * chnages Observer interface to use context * Makes Discovery take its own logger * WIP * linter fixes * Test fixes * adds in ConnFailure code for cache
98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
// Copyright (C) 2018 Storj Labs, Inc.
|
|
// See LICENSE for copying information.
|
|
|
|
package discovery
|
|
|
|
import (
|
|
"context"
|
|
"crypto/rand"
|
|
|
|
"github.com/zeebo/errs"
|
|
"go.uber.org/zap"
|
|
|
|
"storj.io/storj/pkg/kademlia"
|
|
"storj.io/storj/pkg/overlay"
|
|
"storj.io/storj/pkg/statdb"
|
|
"storj.io/storj/pkg/storj"
|
|
)
|
|
|
|
var (
|
|
// DiscoveryError is a general error class of this package
|
|
DiscoveryError = errs.Class("discovery error")
|
|
)
|
|
|
|
// Discovery struct loads on cache, kad, and statdb
|
|
type Discovery struct {
|
|
log *zap.Logger
|
|
cache *overlay.Cache
|
|
kad *kademlia.Kademlia
|
|
statdb statdb.DB
|
|
}
|
|
|
|
// NewDiscovery Returns a new Discovery instance with cache, kad, and statdb loaded on
|
|
func NewDiscovery(logger *zap.Logger, ol *overlay.Cache, kad *kademlia.Kademlia, stat statdb.DB) *Discovery {
|
|
return &Discovery{
|
|
log: logger,
|
|
cache: ol,
|
|
kad: kad,
|
|
statdb: stat,
|
|
}
|
|
}
|
|
|
|
// Refresh updates the cache db with the current DHT.
|
|
// We currently do not penalize nodes that are unresponsive,
|
|
// but should in the future.
|
|
func (d *Discovery) Refresh(ctx context.Context) error {
|
|
// TODO(coyle): make refresh work by looking on the network for new ndoes
|
|
nodes := d.kad.Seen()
|
|
|
|
for _, v := range nodes {
|
|
if err := d.cache.Put(ctx, v.Id, *v); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Bootstrap walks the initialized network and populates the cache
|
|
func (d *Discovery) Bootstrap(ctx context.Context) error {
|
|
// o := overlay.LoadFromContext(ctx)
|
|
// kad := kademlia.LoadFromContext(ctx)
|
|
// TODO(coyle): make Bootstrap work
|
|
// look in our routing table
|
|
// get every node we know about
|
|
// ask every node for every node they know about
|
|
// for each newly known node, ask those nodes for every node they know about
|
|
// continue until no new nodes are found
|
|
return nil
|
|
}
|
|
|
|
// Discovery runs lookups for random node ID's to find new nodes in the network
|
|
func (d *Discovery) Discovery(ctx context.Context) error {
|
|
r, err := randomID()
|
|
if err != nil {
|
|
return DiscoveryError.Wrap(err)
|
|
}
|
|
_, err = d.kad.FindNode(ctx, r)
|
|
if err != nil && !kademlia.NodeNotFound.Has(err) {
|
|
return DiscoveryError.Wrap(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Walk iterates over each node in each bucket to traverse the network
|
|
func (d *Discovery) Walk(ctx context.Context) error {
|
|
// TODO: This should walk the cache, rather than be a duplicate of refresh
|
|
return nil
|
|
}
|
|
|
|
func randomID() (storj.NodeID, error) {
|
|
b := make([]byte, 32)
|
|
_, err := rand.Read(b)
|
|
if err != nil {
|
|
return storj.NodeID{}, DiscoveryError.Wrap(err)
|
|
}
|
|
return storj.NodeIDFromBytes(b)
|
|
}
|