swarm/network/stream: Added TestPureRetrieval

swarm/network/stream/snapshot_retrieval_test.go

@@ -16,8 +16,10 @@
 package stream
 
 import (
+	"bytes"
 	"context"
 	"fmt"
+	"io"
 	"sync"
 	"testing"
 	"time"
@@ -67,6 +69,44 @@ func TestFileRetrieval(t *testing.T) {
 	}
 }
 
+// TestPureRetrieval tests pure retrieval without syncing
+// A configurable number of nodes and chunks
+// can be provided to the test.
+// A number of random chunks is generated, then stored directly in
+// each node's localstore according to their address.
+// Each chunk is supposed to end up at certain nodes
+// With retrieval we then make sure that every node can actually retrieve
+// the chunks.
+func TestPureRetrieval(t *testing.T) {
+	var nodeCount []int
+	var chunkCount []int
+
+	if *nodes != 0 && *chunks != 0 {
+		nodeCount = []int{*nodes}
+		chunkCount = []int{*chunks}
+	} else {
+		nodeCount = []int{16}
+		chunkCount = []int{150}
+
+		if *longrunning {
+			nodeCount = append(nodeCount, 32, 64)
+			chunkCount = append(chunkCount, 32, 256)
+		} else if testutil.RaceEnabled {
+			nodeCount = []int{4}
+			chunkCount = []int{4}
+		}
+
+	}
+
+	for _, nc := range nodeCount {
+		for _, c := range chunkCount {
+			if err := runPureRetrievalTest(nc, c); err != nil {
+				t.Error(err)
+			}
+		}
+	}
+}
+
 //This test is a retrieval test for nodes.
 //One node is randomly selected to be the pivot node.
 //A configurable number of chunks and nodes can be
@@ -132,14 +172,159 @@ var retrievalSimServiceMap = map[string]simulation.ServiceFunc{
 	},
 }
 
-/*
+// runPureRetrievalTest by uploading a snapshot,
-The test loads a snapshot file to construct the swarm network,
+// then starting a simulation, distribute chunks to nodes
-assuming that the snapshot file identifies a healthy
+// and start retrieval.
-kademlia network. Nevertheless a health check runs in the
+// The snapshot should have 'streamer' in its service list.
-simulation's `action` function.
+func runPureRetrievalTest(nodeCount int, chunkCount int) error {
+	// the pure retrieval test needs a different service map, as we want
+	// syncing disabled and we don't need to set the syncUpdateDelay
+	sim := simulation.New(map[string]simulation.ServiceFunc{
+		"streamer": func(ctx *adapters.ServiceContext, bucket *sync.Map) (s node.Service, cleanup func(), err error) {
+			addr, netStore, delivery, clean, err := newNetStoreAndDelivery(ctx, bucket)
+			if err != nil {
+				return nil, nil, err
+			}
 
-The snapshot should have 'streamer' in its service list.
+			r := NewRegistry(addr.ID(), delivery, netStore, state.NewInmemoryStore(), &RegistryOptions{
-*/
+				Syncing: SyncingDisabled, // disable syncing
+			}, nil)
+
+			cleanup = func() {
+				r.Close()
+				clean()
+			}
+
+			return r, cleanup, nil
+		},
+	},
+	)
+	defer sim.Close()
+
+	log.Info("Initializing test config", "node count", nodeCount)
+
+	conf := &synctestConfig{}
+	//map of discover ID to indexes of chunks expected at that ID
+	conf.idToChunksMap = make(map[enode.ID][]int)
+	//map of overlay address to discover ID
+	conf.addrToIDMap = make(map[string]enode.ID)
+	//array where the generated chunk hashes will be stored
+	conf.hashes = make([]storage.Address, 0)
+
+	ctx, cancelSimRun := context.WithTimeout(context.Background(), 3*time.Minute)
+	defer cancelSimRun()
+
+	filename := fmt.Sprintf("testing/snapshot_%d.json", nodeCount)
+	err := sim.UploadSnapshot(ctx, filename)
+	if err != nil {
+		return err
+	}
+
+	log.Info("Starting simulation")
+
+	result := sim.Run(ctx, func(ctx context.Context, sim *simulation.Simulation) error {
+		nodeIDs := sim.UpNodeIDs()
+		// first iteration: create addresses
+		for _, n := range nodeIDs {
+			//get the kademlia overlay address from this ID
+			a := n.Bytes()
+			//append it to the array of all overlay addresses
+			conf.addrs = append(conf.addrs, a)
+			//the proximity calculation is on overlay addr,
+			//the p2p/simulations check func triggers on enode.ID,
+			//so we need to know which overlay addr maps to which nodeID
+			conf.addrToIDMap[string(a)] = n
+		}
+
+		// now create random chunks
+		chunks := storage.GenerateRandomChunks(int64(chunkSize), chunkCount)
+		for _, chunk := range chunks {
+			conf.hashes = append(conf.hashes, chunk.Address())
+		}
+
+		log.Debug("random chunks generated, mapping keys to nodes")
+
+		// map addresses to nodes
+		mapKeysToNodes(conf)
+
+		// second iteration: storing chunks at the peer whose
+		// overlay address is closest to a particular chunk's hash
+		log.Debug("storing every chunk at correspondent node store")
+		for _, id := range nodeIDs {
+			// for every chunk for this node (which are only indexes)...
+			for _, ch := range conf.idToChunksMap[id] {
+				item, ok := sim.NodeItem(id, bucketKeyStore)
+				if !ok {
+					return fmt.Errorf("Error accessing localstore")
+				}
+				lstore := item.(chunk.Store)
+				// ...get the actual chunk
+				for _, chnk := range chunks {
+					if bytes.Equal(chnk.Address(), conf.hashes[ch]) {
+						// ...and store it in the localstore
+						if _, err = lstore.Put(ctx, chunk.ModePutUpload, chnk); err != nil {
+							return err
+						}
+					}
+				}
+			}
+		}
+
+		// now try to retrieve every chunk from every node
+		log.Debug("starting retrieval")
+		cnt := 0
+
+	REPEAT:
+		for {
+			for _, id := range nodeIDs {
+				item, ok := sim.NodeItem(id, bucketKeyFileStore)
+				if !ok {
+					return fmt.Errorf("No filestore")
+				}
+				fileStore := item.(*storage.FileStore)
+				for _, chunk := range chunks {
+					reader, _ := fileStore.Retrieve(context.TODO(), chunk.Address())
+					content := make([]byte, chunkSize)
+					size, err := reader.Read(content)
+					//check chunk size and content
+					ok := true
+					if err != io.EOF {
+						log.Debug("Retrieve error", "err", err, "hash", chunk.Address(), "nodeId", id)
+						ok = false
+					}
+					if size != chunkSize {
+						log.Debug("size not equal chunkSize", "size", size, "hash", chunk.Address(), "nodeId", id)
+						ok = false
+					}
+					// skip chunk "metadata" for chunk.Data()
+					if !bytes.Equal(content, chunk.Data()[8:]) {
+						log.Debug("content not equal chunk data", "hash", chunk.Address(), "nodeId", id)
+						ok = false
+					}
+					if !ok {
+						time.Sleep(500 * time.Millisecond)
+						// we continue trying if it failed
+						continue REPEAT
+					}
+					log.Debug(fmt.Sprintf("chunk with root hash %x successfully retrieved", chunk.Address()))
+					cnt++
+				}
+			}
+			// we iterate sequentially, one after the other, so at this point we got all chunks
+			break
+		}
+		log.Info("retrieval terminated, chunks retrieved: ", "count", cnt)
+		return nil
+
+	})
+
+	log.Info("Simulation terminated")
+
+	return result.Error
+}
+
+// The test loads a snapshot file to construct the swarm network.
+// The snapshot should have 'streamer' in its service list.
 func runFileRetrievalTest(nodeCount int) error {
 	sim := simulation.New(retrievalSimServiceMap)
 	defer sim.Close()
@@ -180,9 +365,6 @@ func runFileRetrievalTest(nodeCount int) error {
 
 		//an array for the random files
 		var randomFiles []string
-		//channel to signal when the upload has finished
-		//uploadFinished := make(chan struct{})
-		//channel to trigger new node checks
 
 		conf.hashes, randomFiles, err = uploadFilesToNodes(sim)
 		if err != nil {
@@ -227,16 +409,9 @@ func runFileRetrievalTest(nodeCount int) error {
 	return nil
 }
 
-/*
+// The test generates the given number of chunks.
-The test generates the given number of chunks.
+// The test loads a snapshot file to construct the swarm network.
-
+// The snapshot should have 'streamer' in its service list.
-The test loads a snapshot file to construct the swarm network,
-assuming that the snapshot file identifies a healthy
-kademlia network. Nevertheless a health check runs in the
-simulation's `action` function.
-
-The snapshot should have 'streamer' in its service list.
-*/
 func runRetrievalTest(t *testing.T, chunkCount int, nodeCount int) error {
 	t.Helper()
 	sim := simulation.New(retrievalSimServiceMap)
@@ -278,8 +453,8 @@ func runRetrievalTest(t *testing.T, chunkCount int, nodeCount int) error {
 		if !ok {
 			return fmt.Errorf("No localstore")
 		}
-		store := item.(chunk.Store)
+		lstore := item.(chunk.Store)
-		conf.hashes, err = uploadFileToSingleNodeStore(node.ID(), chunkCount, store)
+		conf.hashes, err = uploadFileToSingleNodeStore(node.ID(), chunkCount, lstore)
 		if err != nil {
 			return err
 		}