testutils.go 2.77 KB
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package bitswap

import (
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	"time"

	context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/go.net/context"
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	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"
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	blockstore "github.com/jbenet/go-ipfs/blocks/blockstore"
	exchange "github.com/jbenet/go-ipfs/exchange"
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	tn "github.com/jbenet/go-ipfs/exchange/bitswap/testnet"
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	peer "github.com/jbenet/go-ipfs/peer"
	datastore2 "github.com/jbenet/go-ipfs/util/datastore2"
	delay "github.com/jbenet/go-ipfs/util/delay"
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	testutil "github.com/jbenet/go-ipfs/util/testutil"
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)

func NewSessionGenerator(
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	net tn.Network) SessionGenerator {
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	ctx, cancel := context.WithCancel(context.TODO())
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	return SessionGenerator{
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		net:    net,
		seq:    0,
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		ctx:    ctx, // TODO take ctx as param to Next, Instances
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		cancel: cancel,
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	}
}

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// TODO move this SessionGenerator to the core package and export it as the core generator
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type SessionGenerator struct {
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	seq    int
	net    tn.Network
	ctx    context.Context
	cancel context.CancelFunc
}

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func (g *SessionGenerator) Close() error {
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	g.cancel()
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	return nil // for Closer interface
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}

func (g *SessionGenerator) Next() Instance {
	g.seq++
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	p, err := testutil.RandIdentity()
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	if err != nil {
		panic("FIXME") // TODO change signature
	}
	return session(g.ctx, g.net, p)
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}

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 {
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	Peer       peer.ID
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	Exchange   exchange.Interface
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	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)
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}

// 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.
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func session(ctx context.Context, net tn.Network, p testutil.Identity) Instance {
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	bsdelay := delay.Fixed(0)
	const kWriteCacheElems = 100
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	adapter := net.Adapter(p)
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	dstore := ds_sync.MutexWrap(datastore2.WithDelay(ds.NewMapDatastore(), bsdelay))
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	bstore, err := blockstore.WriteCached(blockstore.NewBlockstore(ds_sync.MutexWrap(dstore)), kWriteCacheElems)
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	if err != nil {
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		panic(err.Error()) // FIXME perhaps change signature and return error.
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	}
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	const alwaysSendToPeer = true

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	bs := New(ctx, p.ID(), adapter, bstore, alwaysSendToPeer)
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	return Instance{
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		Peer:            p.ID(),
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		Exchange:        bs,
		blockstore:      bstore,
		blockstoreDelay: bsdelay,
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	}
}