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testutils.go
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testutils.go
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package bitswap
import (
"time"
ds "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore"
ds_sync "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore/sync"
context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
blockstore "github.com/jbenet/go-ipfs/blocks/blockstore"
exchange "github.com/jbenet/go-ipfs/exchange"
tn "github.com/jbenet/go-ipfs/exchange/bitswap/testnet"
peer "github.com/jbenet/go-ipfs/p2p/peer"
p2ptestutil "github.com/jbenet/go-ipfs/p2p/test/util"
delay "github.com/jbenet/go-ipfs/thirdparty/delay"
datastore2 "github.com/jbenet/go-ipfs/util/datastore2"
testutil "github.com/jbenet/go-ipfs/util/testutil"
)
// WARNING: this uses RandTestBogusIdentity DO NOT USE for NON TESTS!
func NewTestSessionGenerator(
net tn.Network) SessionGenerator {
ctx, cancel := context.WithCancel(context.TODO())
return SessionGenerator{
net: net,
seq: 0,
ctx: ctx, // TODO take ctx as param to Next, Instances
cancel: cancel,
}
}
// TODO move this SessionGenerator to the core package and export it as the core generator
type SessionGenerator struct {
seq int
net tn.Network
ctx context.Context
cancel context.CancelFunc
}
func (g *SessionGenerator) Close() error {
g.cancel()
return nil // for Closer interface
}
func (g *SessionGenerator) Next() Instance {
g.seq++
p, err := p2ptestutil.RandTestBogusIdentity()
if err != nil {
panic("FIXME") // TODO change signature
}
return session(g.ctx, g.net, p)
}
func (g *SessionGenerator) Instances(n int) []Instance {
instances := make([]Instance, 0)
for j := 0; j < n; j++ {
inst := g.Next()
instances = append(instances, inst)
}
return instances
}
type Instance struct {
Peer peer.ID
Exchange exchange.Interface
blockstore blockstore.Blockstore
blockstoreDelay delay.D
}
func (i *Instance) Blockstore() blockstore.Blockstore {
return i.blockstore
}
func (i *Instance) SetBlockstoreLatency(t time.Duration) time.Duration {
return i.blockstoreDelay.Set(t)
}
// session creates a test bitswap session.
//
// NB: It's easy make mistakes by providing the same peer ID to two different
// sessions. To safeguard, use the SessionGenerator to generate sessions. It's
// just a much better idea.
func session(ctx context.Context, net tn.Network, p testutil.Identity) Instance {
bsdelay := delay.Fixed(0)
const kWriteCacheElems = 100
adapter := net.Adapter(p)
dstore := ds_sync.MutexWrap(datastore2.WithDelay(ds.NewMapDatastore(), bsdelay))
bstore, err := blockstore.WriteCached(blockstore.NewBlockstore(ds_sync.MutexWrap(dstore)), kWriteCacheElems)
if err != nil {
panic(err.Error()) // FIXME perhaps change signature and return error.
}
const alwaysSendToPeer = true
bs := New(ctx, p.ID(), adapter, bstore, alwaysSendToPeer)
return Instance{
Peer: p.ID(),
Exchange: bs,
blockstore: bstore,
blockstoreDelay: bsdelay,
}
}