Golang modules.HostDBEntry類代碼示例

// TestRepeatInsert inserts 2 hosts with the same address.
func TestRepeatInsert(t *testing.T) {
	if testing.Short() {
		t.SkipNow()
	}
	hdb := &HostDB{
		activeHosts: make(map[modules.NetAddress]*hostNode),
		allHosts:    make(map[modules.NetAddress]*hostEntry),
		scanPool:    make(chan *hostEntry, scanPoolSize),
	}

	var dbe modules.HostDBEntry
	dbe.NetAddress = fakeAddr(0)
	entry1 := hostEntry{
		HostDBEntry: dbe,
		Weight:      types.NewCurrency64(1),
	}
	entry2 := entry1
	hdb.insertNode(&entry1)

	entry2.Weight = types.NewCurrency64(100)
	hdb.insertNode(&entry2)
	if len(hdb.activeHosts) != 1 {
		t.Error("insterting the same entry twice should result in only 1 entry in the hostdb")
	}
}

// TestVariedWeights runs broad statistical tests on selecting hosts with
// multiple different weights.
func TestVariedWeights(t *testing.T) {
	if testing.Short() {
		t.SkipNow()
	}
	hdb := &HostDB{
		activeHosts: make(map[modules.NetAddress]*hostNode),
		allHosts:    make(map[modules.NetAddress]*hostEntry),
		scanPool:    make(chan *hostEntry, scanPoolSize),
	}

	// insert i hosts with the weights 0, 1, ..., i-1. 100e3 selections will be made
	// per weight added to the tree, the total number of selections necessary
	// will be tallied up as hosts are created.
	var dbe modules.HostDBEntry
	dbe.AcceptingContracts = true
	hostCount := 5
	expectedPerWeight := int(10e3)
	selections := 0
	for i := 0; i < hostCount; i++ {
		dbe.NetAddress = fakeAddr(uint8(i))
		entry := hostEntry{
			HostDBEntry: dbe,
			Weight:      types.NewCurrency64(uint64(i)),
		}
		hdb.insertNode(&entry)
		selections += i * expectedPerWeight
	}

	// Perform many random selections, noting which host was selected each
	// time.
	selectionMap := make(map[string]int)
	for i := 0; i < selections; i++ {
		randEntry := hdb.RandomHosts(1, nil)
		if len(randEntry) == 0 {
			t.Fatal("no hosts!")
		}
		node, exists := hdb.activeHosts[randEntry[0].NetAddress]
		if !exists {
			t.Fatal("can't find randomly selected node in tree")
		}
		selectionMap[node.hostEntry.Weight.String()]++
	}

	// Check that each host was selected an expected number of times. An error
	// will be reported if the host of 0 weight is ever selected.
	acceptableError := 0.2
	for weight, timesSelected := range selectionMap {
		intWeight, err := strconv.Atoi(weight)
		if err != nil {
			t.Fatal(err)
		}

		expectedSelected := float64(intWeight * expectedPerWeight)
		if float64(expectedSelected)*acceptableError > float64(timesSelected) || float64(expectedSelected)/acceptableError < float64(timesSelected) {
			t.Error("weighted list not selecting in a uniform distribution based on weight")
			t.Error(expectedSelected)
			t.Error(timesSelected)
		}
	}
}

// TestInsertHost tests the insertHost method, which also depends on the
// scanHostEntry method.
func TestInsertHost(t *testing.T) {
	hdb := bareHostDB()

	// invalid host should not be scanned
	var dbe modules.HostDBEntry
	dbe.NetAddress = "foo"
	hdb.insertHost(dbe)
	select {
	case <-hdb.scanPool:
		t.Error("invalid host was added to scan pool")
	case <-time.After(100 * time.Millisecond):
	}

	// valid host should be scanned
	dbe.NetAddress = "foo.com:1234"
	hdb.insertHost(dbe)
	select {
	case <-hdb.scanPool:
	case <-time.After(time.Second):
		t.Error("host was not scanned")
	}

	// duplicate host should not be scanned
	hdb.insertHost(dbe)
	select {
	case <-hdb.scanPool:
		t.Error("duplicate host was added to scan pool")
	case <-time.After(100 * time.Millisecond):
	}
}

// findHostAnnouncements returns a list of the host announcements found within
// a given block. No check is made to see that the ip address found in the
// announcement is actually a valid ip address.
func findHostAnnouncements(b types.Block) (announcements []modules.HostDBEntry) {
	for _, t := range b.Transactions {
		// the HostAnnouncement must be prefaced by the standard host
		// announcement string
		for _, arb := range t.ArbitraryData {
			addr, pubKey, err := modules.DecodeAnnouncement(arb)
			if err != nil {
				continue
			}

			// Add the announcement to the slice being returned.
			var host modules.HostDBEntry
			host.NetAddress = addr
			host.PublicKey = pubKey
			announcements = append(announcements, host)
		}
	}
	return
}

// managedNewContract negotiates an initial file contract with the specified
// host, saves it, and returns it.
func (c *Contractor) managedNewContract(host modules.HostDBEntry, numSectors uint64, endHeight types.BlockHeight) (modules.RenterContract, error) {
	// reject hosts that are too expensive
	if host.StoragePrice.Cmp(maxStoragePrice) > 0 {
		return modules.RenterContract{}, errTooExpensive
	}
	// cap host.MaxCollateral
	if host.MaxCollateral.Cmp(maxCollateral) > 0 {
		host.MaxCollateral = maxCollateral
	}

	// get an address to use for negotiation
	uc, err := c.wallet.NextAddress()
	if err != nil {
		return modules.RenterContract{}, err
	}

	// create contract params
	c.mu.RLock()
	params := proto.ContractParams{
		Host:          host,
		Filesize:      numSectors * modules.SectorSize,
		StartHeight:   c.blockHeight,
		EndHeight:     endHeight,
		RefundAddress: uc.UnlockHash(),
	}
	c.mu.RUnlock()

	// create transaction builder
	txnBuilder := c.wallet.StartTransaction()

	contract, err := proto.FormContract(params, txnBuilder, c.tpool)
	if err != nil {
		txnBuilder.Drop()
		return modules.RenterContract{}, err
	}

	contractValue := contract.RenterFunds()
	c.log.Printf("Formed contract with %v for %v SC", host.NetAddress, contractValue.Div(types.SiacoinPrecision))

	return contract, nil
}

// verifySettings reads a signed HostSettings object from conn, validates the
// signature, and checks for discrepancies between the known settings and the
// received settings. If there is a discrepancy, the hostDB is notified. The
// received settings are returned.
func verifySettings(conn net.Conn, host modules.HostDBEntry) (modules.HostDBEntry, error) {
	// convert host key (types.SiaPublicKey) to a crypto.PublicKey
	if host.PublicKey.Algorithm != types.SignatureEd25519 || len(host.PublicKey.Key) != crypto.PublicKeySize {
		build.Critical("hostdb did not filter out host with wrong signature algorithm:", host.PublicKey.Algorithm)
		return modules.HostDBEntry{}, errors.New("host used unsupported signature algorithm")
	}
	var pk crypto.PublicKey
	copy(pk[:], host.PublicKey.Key)

	// read signed host settings
	var recvSettings modules.HostExternalSettings
	if err := crypto.ReadSignedObject(conn, &recvSettings, modules.NegotiateMaxHostExternalSettingsLen, pk); err != nil {
		return modules.HostDBEntry{}, errors.New("couldn't read host's settings: " + err.Error())
	}
	// TODO: check recvSettings against host.HostExternalSettings. If there is
	// a discrepancy, write the error to conn.
	if recvSettings.NetAddress != host.NetAddress {
		// for now, just overwrite the NetAddress, since we know that
		// host.NetAddress works (it was the one we dialed to get conn)
		recvSettings.NetAddress = host.NetAddress
	}
	host.HostExternalSettings = recvSettings
	return host, nil
}

// TestRandomHosts probes the RandomHosts function.
func TestRandomHosts(t *testing.T) {
	// Create the hostdb.
	hdb := bareHostDB()

	// Empty.
	if hosts := hdb.RandomHosts(1, nil); len(hosts) != 0 {
		t.Errorf("empty hostdb returns %v hosts: %v", len(hosts), hosts)
	}

	// Insert 3 hosts to be selected.
	var dbe modules.HostDBEntry
	dbe.NetAddress = fakeAddr(1)
	dbe.AcceptingContracts = true
	entry1 := hostEntry{
		HostDBEntry: dbe,
		Weight:      types.NewCurrency64(1),
	}
	dbe.NetAddress = fakeAddr(2)
	entry2 := hostEntry{
		HostDBEntry: dbe,
		Weight:      types.NewCurrency64(2),
	}
	dbe.NetAddress = fakeAddr(3)
	entry3 := hostEntry{
		HostDBEntry: dbe,
		Weight:      types.NewCurrency64(3),
	}
	hdb.insertNode(&entry1)
	hdb.insertNode(&entry2)
	hdb.insertNode(&entry3)

	if len(hdb.activeHosts) != 3 {
		t.Error("wrong number of hosts")
	}
	if hdb.hostTree.weight.Cmp(types.NewCurrency64(6)) != 0 {
		t.Error("unexpected weight at initialization")
		t.Error(hdb.hostTree.weight)
	}

	// Grab 1 random host.
	randHosts := hdb.RandomHosts(1, nil)
	if len(randHosts) != 1 {
		t.Error("didn't get 1 hosts")
	}

	// Grab 2 random hosts.
	randHosts = hdb.RandomHosts(2, nil)
	if len(randHosts) != 2 {
		t.Error("didn't get 2 hosts")
	}
	if randHosts[0].NetAddress == randHosts[1].NetAddress {
		t.Error("doubled up")
	}

	// Grab 3 random hosts.
	randHosts = hdb.RandomHosts(3, nil)
	if len(randHosts) != 3 {
		t.Error("didn't get 3 hosts")
	}
	if randHosts[0].NetAddress == randHosts[1].NetAddress || randHosts[0].NetAddress == randHosts[2].NetAddress || randHosts[1].NetAddress == randHosts[2].NetAddress {
		t.Error("doubled up")
	}

	// Grab 4 random hosts. 3 should be returned.
	randHosts = hdb.RandomHosts(4, nil)
	if len(randHosts) != 3 {
		t.Error("didn't get 3 hosts")
	}
	if randHosts[0].NetAddress == randHosts[1].NetAddress || randHosts[0].NetAddress == randHosts[2].NetAddress || randHosts[1].NetAddress == randHosts[2].NetAddress {
		t.Error("doubled up")
	}

	// Ask for 3 hosts that are not in randHosts. No hosts should be
	// returned.
	uniqueHosts := hdb.RandomHosts(3, []modules.NetAddress{
		randHosts[0].NetAddress,
		randHosts[1].NetAddress,
		randHosts[2].NetAddress,
	})
	if len(uniqueHosts) != 0 {
		t.Error("didn't get 0 hosts")
	}

	// Ask for 3 hosts, blacklisting non-existent hosts. 3 should be returned.
	randHosts = hdb.RandomHosts(3, []modules.NetAddress{"foo", "bar", "baz"})
	if len(randHosts) != 3 {
		t.Error("didn't get 3 hosts")
	}
	if randHosts[0].NetAddress == randHosts[1].NetAddress || randHosts[0].NetAddress == randHosts[2].NetAddress || randHosts[1].NetAddress == randHosts[2].NetAddress {
		t.Error("doubled up")
	}

	// entry4 should not every be returned by RandomHosts because it is not
	// accepting contracts.
	dbe.NetAddress = fakeAddr(4)
	dbe.AcceptingContracts = false
	entry4 := hostEntry{
		HostDBEntry: dbe,
		Weight:      types.NewCurrency64(4),
//.........這裏部分代碼省略.........

// TestWeightedList inserts and removes nodes in a semi-random manner and
// verifies that the tree stays consistent through the adjustments.
func TestWeightedList(t *testing.T) {
	if testing.Short() {
		t.SkipNow()
	}

	// Create a hostdb and 3 equal entries to insert.
	hdb := bareHostDB()

	// Create a bunch of host entries of equal weight.
	var dbe modules.HostDBEntry
	dbe.AcceptingContracts = true
	firstInsertions := 64
	for i := 0; i < firstInsertions; i++ {
		dbe.NetAddress = fakeAddr(uint8(i))
		entry := hostEntry{
			HostDBEntry: dbe,
			Weight:      types.NewCurrency64(10),
		}
		hdb.insertNode(&entry)
	}
	err := uniformTreeVerification(hdb, firstInsertions)
	if err != nil {
		t.Error(err)
	}

	// Remove a few hosts and check that the tree is still in order.
	removals := 12
	// Keep a map of what we've removed so far.
	removedMap := make(map[uint8]struct{})
	for i := 0; i < removals; i++ {
		// Try numbers until we roll a number that's not been removed yet.
		var randInt uint8
		for {
			randBig, err := rand.Int(rand.Reader, big.NewInt(int64(firstInsertions)))
			if err != nil {
				t.Fatal(err)
			}
			randInt = uint8(randBig.Int64())
			_, exists := removedMap[randInt]
			if !exists {
				break
			}
		}

		// Remove the entry and add it to the list of removed entries
		err := hdb.removeHost(fakeAddr(randInt))
		if err != nil {
			t.Fatal(err)
		}
		removedMap[randInt] = struct{}{}
	}
	err = uniformTreeVerification(hdb, firstInsertions-removals)
	if err != nil {
		t.Error(err)
	}

	// Do some more insertions.
	secondInsertions := 64
	for i := firstInsertions; i < firstInsertions+secondInsertions; i++ {
		dbe.NetAddress = fakeAddr(uint8(i))
		entry := hostEntry{
			HostDBEntry: dbe,
			Weight:      types.NewCurrency64(10),
		}
		hdb.insertNode(&entry)
	}
	err = uniformTreeVerification(hdb, firstInsertions-removals+secondInsertions)
	if err != nil {
		t.Error(err)
	}
}

// TestEditor tests the failure conditions of the Editor method. The method is
// more fully tested in the host integration test.
func TestEditor(t *testing.T) {
	// use a mock hostdb to supply hosts
	hdb := &editorHostDB{
		hosts: make(map[modules.NetAddress]modules.HostDBEntry),
	}
	c := &Contractor{
		hdb: hdb,
	}

	// empty contract
	_, err := c.Editor(modules.RenterContract{})
	if err == nil {
		t.Error("expected error, got nil")
	}

	// expired contract
	c.blockHeight = 3
	_, err = c.Editor(modules.RenterContract{})
	if err == nil {
		t.Error("expected error, got nil")
	}
	c.blockHeight = 0

	// expensive host
	_, hostPublicKey := crypto.GenerateKeyPairDeterministic([32]byte{})
	dbe := modules.HostDBEntry{
		PublicKey: types.SiaPublicKey{
			Algorithm: types.SignatureEd25519,
			Key:       hostPublicKey[:],
		},
	}
	dbe.AcceptingContracts = true
	dbe.StoragePrice = types.NewCurrency64(^uint64(0))
	hdb.hosts["foo"] = dbe
	_, err = c.Editor(modules.RenterContract{NetAddress: "foo"})
	if err == nil {
		t.Error("expected error, got nil")
	}

	// invalid contract
	dbe.StoragePrice = types.NewCurrency64(500)
	hdb.hosts["bar"] = dbe
	_, err = c.Editor(modules.RenterContract{NetAddress: "bar"})
	if err == nil {
		t.Error("expected error, got nil")
	}

	// spent contract
	contract := modules.RenterContract{
		NetAddress: "bar",
		LastRevision: types.FileContractRevision{
			NewValidProofOutputs: []types.SiacoinOutput{
				{Value: types.NewCurrency64(0)},
				{Value: types.NewCurrency64(^uint64(0))},
			},
		},
	}
	_, err = c.Editor(contract)
	if err == nil {
		t.Error("expected error, got nil")
	}
}