Golang hashstructure.Hash函數代碼示例

func TestClient_HasNodeChanged(t *testing.T) {
	c := testClient(t, nil)
	defer c.Shutdown()

	node := c.Node()
	attrHash, err := hashstructure.Hash(node.Attributes, nil)
	if err != nil {
		c.logger.Printf("[DEBUG] client: unable to calculate node attributes hash: %v", err)
	}
	// Calculate node meta map hash
	metaHash, err := hashstructure.Hash(node.Meta, nil)
	if err != nil {
		c.logger.Printf("[DEBUG] client: unable to calculate node meta hash: %v", err)
	}
	if changed, _, _ := c.hasNodeChanged(attrHash, metaHash); changed {
		t.Fatalf("Unexpected hash change.")
	}

	// Change node attribute
	node.Attributes["arch"] = "xyz_86"
	if changed, newAttrHash, _ := c.hasNodeChanged(attrHash, metaHash); !changed {
		t.Fatalf("Expected hash change in attributes: %d vs %d", attrHash, newAttrHash)
	}

	// Change node meta map
	node.Meta["foo"] = "bar"
	if changed, _, newMetaHash := c.hasNodeChanged(attrHash, metaHash); !changed {
		t.Fatalf("Expected hash change in meta map: %d vs %d", metaHash, newMetaHash)
	}
}

// hasNodeChanged calculates a hash for the node attributes- and meta map.
// The new hash values are compared against the old (passed-in) hash values to
// determine if the node properties have changed. It returns the new hash values
// in case they are different from the old hash values.
func (c *Client) hasNodeChanged(oldAttrHash uint64, oldMetaHash uint64) (bool, uint64, uint64) {
	newAttrHash, err := hashstructure.Hash(c.config.Node.Attributes, nil)
	if err != nil {
		c.logger.Printf("[DEBUG] client: unable to calculate node attributes hash: %v", err)
	}
	// Calculate node meta map hash
	newMetaHash, err := hashstructure.Hash(c.config.Node.Meta, nil)
	if err != nil {
		c.logger.Printf("[DEBUG] client: unable to calculate node meta hash: %v", err)
	}
	if newAttrHash != oldAttrHash || newMetaHash != oldMetaHash {
		return true, newAttrHash, newMetaHash
	}
	return false, oldAttrHash, oldMetaHash
}

// hashInlineQueryResult calculates the 64-bit FNV-1 hash of an
// inline query result.
func hashInlineQueryResult(result InlineQueryResult) (string, error) {
	hash, err := hashstructure.Hash(result, inlineQueryHashOptions)
	if err != nil {
		return "", err
	}
	return strconv.FormatUint(hash, 16), nil
}

// primitiveObjectSetDiff does a set difference of the old and new sets. The
// filter parameter can be used to filter a set of primitive fields in the
// passed structs. The name corresponds to the name of the passed objects. If
// contextual diff is enabled, objects' primtive fields will be returned even if
// no diff exists.
func primitiveObjectSetDiff(old, new []interface{}, filter []string, name string, contextual bool) []*ObjectDiff {
	makeSet := func(objects []interface{}) map[string]interface{} {
		objMap := make(map[string]interface{}, len(objects))
		for _, obj := range objects {
			hash, err := hashstructure.Hash(obj, nil)
			if err != nil {
				panic(err)
			}
			objMap[fmt.Sprintf("%d", hash)] = obj
		}

		return objMap
	}

	oldSet := makeSet(old)
	newSet := makeSet(new)

	var diffs []*ObjectDiff
	for k, v := range oldSet {
		// Deleted
		if _, ok := newSet[k]; !ok {
			diffs = append(diffs, primitiveObjectDiff(v, nil, filter, name, contextual))
		}
	}
	for k, v := range newSet {
		// Added
		if _, ok := oldSet[k]; !ok {
			diffs = append(diffs, primitiveObjectDiff(nil, v, filter, name, contextual))
		}
	}

	sort.Sort(ObjectDiffs(diffs))
	return diffs
}

func (j *jsonReader) Parse(changes ...*ChangeSet) (*ChangeSet, error) {
	var merged map[string]interface{}

	for _, m := range changes {
		if len(m.Data) == 0 {
			m.Data = []byte(`{}`)
		}

		var data map[string]interface{}
		if err := json.Unmarshal(m.Data, &data); err != nil {
			return nil, err
		}
		if err := mergo.MapWithOverwrite(&merged, data); err != nil {
			return nil, err
		}
	}

	b, err := json.Marshal(merged)
	if err != nil {
		return nil, err
	}

	h, err := hash.Hash(merged, nil)
	if err != nil {
		return nil, err
	}

	return &ChangeSet{
		Timestamp: time.Now(),
		Data:      b,
		Checksum:  fmt.Sprintf("%x", h),
		Source:    "json",
	}, nil
}

func TestReadWriteStateV1(t *testing.T) {
	state := &StateV1{
		Resources: map[string]*ResourceStateV1{
			"foo": &ResourceStateV1{
				ID: "bar",
				ConnInfo: map[string]string{
					"type":     "ssh",
					"user":     "root",
					"password": "supersecret",
				},
			},
		},
	}

	// Checksum before the write
	chksum, err := hashstructure.Hash(state, nil)
	if err != nil {
		t.Fatalf("hash: %s", err)
	}

	buf := new(bytes.Buffer)
	if err := testWriteStateV1(state, buf); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Checksum after the write
	chksumAfter, err := hashstructure.Hash(state, nil)
	if err != nil {
		t.Fatalf("hash: %s", err)
	}

	if chksumAfter != chksum {
		t.Fatalf("structure changed during serialization!")
	}

	actual, err := ReadStateV1(buf)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// ReadState should not restore sensitive information!
	state.Resources["foo"].ConnInfo = nil

	if !reflect.DeepEqual(actual, state) {
		t.Fatalf("bad: %#v", actual)
	}
}

// handleUpdate takes an updated allocation and updates internal state to
// reflect the new config for the task.
func (r *TaskRunner) handleUpdate(update *structs.Allocation) error {
	// Extract the task group from the alloc.
	tg := update.Job.LookupTaskGroup(update.TaskGroup)
	if tg == nil {
		return fmt.Errorf("alloc '%s' missing task group '%s'", update.ID, update.TaskGroup)
	}

	// Extract the task.
	var updatedTask *structs.Task
	for _, t := range tg.Tasks {
		if t.Name == r.task.Name {
			updatedTask = t
		}
	}
	if updatedTask == nil {
		return fmt.Errorf("task group %q doesn't contain task %q", tg.Name, r.task.Name)
	}

	// Merge in the task resources
	updatedTask.Resources = update.TaskResources[updatedTask.Name]

	// Update will update resources and store the new kill timeout.
	var mErr multierror.Error
	r.handleLock.Lock()
	if r.handle != nil {
		if err := r.handle.Update(updatedTask); err != nil {
			mErr.Errors = append(mErr.Errors, fmt.Errorf("updating task resources failed: %v", err))
		}
	}
	r.handleLock.Unlock()

	// Update the restart policy.
	if r.restartTracker != nil {
		r.restartTracker.SetPolicy(tg.RestartPolicy)
	}

	// Hash services returns the hash of the task's services
	hashServices := func(task *structs.Task) uint64 {
		h, err := hashstructure.Hash(task.Services, nil)
		if err != nil {
			mErr.Errors = append(mErr.Errors, fmt.Errorf("hashing services failed %#v: %v", task.Services, err))
		}
		return h
	}

	// Re-register the task to consul if any of the services have changed.
	if hashServices(updatedTask) != hashServices(r.task) {
		if err := r.consulService.Register(updatedTask, update); err != nil {
			mErr.Errors = append(mErr.Errors, fmt.Errorf("updating services with consul failed: %v", err))
		}
	}

	// Store the updated alloc.
	r.alloc = update
	r.task = updatedTask
	return mErr.ErrorOrNil()
}

// ComputeClass computes a derived class for the node based on its attributes.
// ComputedClass is a unique id that identifies nodes with a common set of
// attributes and capabilities. Thus, when calculating a node's computed class
// we avoid including any uniquely identifing fields.
func (n *Node) ComputeClass() error {
	hash, err := hashstructure.Hash(n, nil)
	if err != nil {
		return err
	}

	n.ComputedClass = fmt.Sprintf("v1:%d", hash)
	return nil
}

// ComputeClass computes a derived class for the node based on its attributes.
// ComputedClass is a unique id that identifies nodes with a common set of
// attributes and capabilities. Thus, when calculating a node's computed class
// we avoid including any uniquely identifing fields.
func (n *Node) ComputeClass() error {
	hash, err := hashstructure.Hash(n, nil)
	if err != nil {
		return err
	}

	n.ComputedClass = hash
	return nil
}

// private function without terminal prompts
func updateSecurityGroups(secGrpList *SecurityGroups, dryRun bool) error {

	for _, secGrp := range *secGrpList {
		// Verify the security group class input
		cfg, err := config.LoadSecurityGroupClass(secGrp.Class)
		if err != nil {
			terminal.Information("Skipping Security Group [" + secGrp.Name + "]")
			terminal.ErrorLine(err.Error())
			continue
		} else {
			terminal.Information("Found Security Group class configuration for [" + secGrp.Class + "]")
		}

		// TODO
		fmt.Println("\n\n")
		fmt.Println("aws\n")
		fmt.Println(secGrp.SecurityGroupGrants)
		fmt.Println("awsm\n")
		fmt.Println(cfg.SecurityGroupGrants)
		fmt.Println("\n\n")

		hash1, err := hashstructure.Hash(secGrp.SecurityGroupGrants, nil)
		if err != nil {
			panic(err)
		}

		fmt.Printf("\n\n%d\n\n", hash1)

		hash2, err := hashstructure.Hash(cfg.SecurityGroupGrants, nil)
		if err != nil {
			panic(err)
		}

		fmt.Printf("\n\n%d\n\n", hash2)

	}

	return nil
}

// networkResourceDiffs diffs a set of NetworkResources. If contextual diff is enabled,
// non-changed fields will still be returned.
func networkResourceDiffs(old, new []*NetworkResource, contextual bool) []*ObjectDiff {
	makeSet := func(objects []*NetworkResource) map[string]*NetworkResource {
		objMap := make(map[string]*NetworkResource, len(objects))
		for _, obj := range objects {
			hash, err := hashstructure.Hash(obj, nil)
			if err != nil {
				panic(err)
			}
			objMap[fmt.Sprintf("%d", hash)] = obj
		}

		return objMap
	}

	oldSet := makeSet(old)
	newSet := makeSet(new)

	var diffs []*ObjectDiff
	for k, oldV := range oldSet {
		if newV, ok := newSet[k]; !ok {
			if diff := oldV.Diff(newV, contextual); diff != nil {
				diffs = append(diffs, diff)
			}
		}
	}
	for k, newV := range newSet {
		if oldV, ok := oldSet[k]; !ok {
			if diff := oldV.Diff(newV, contextual); diff != nil {
				diffs = append(diffs, diff)
			}
		}
	}

	sort.Sort(ObjectDiffs(diffs))
	return diffs

}

func (m *mdnsRegistry) Register(service *registry.Service, opts ...registry.RegisterOption) error {
	m.Lock()
	defer m.Unlock()

	entries, ok := m.services[service.Name]
	// first entry, create wildcard used for list queries
	if !ok {
		s, err := mdns.NewMDNSService(
			service.Name,
			"_services",
			"",
			"",
			9999,
			[]net.IP{net.ParseIP("0.0.0.0")},
			nil,
		)
		if err != nil {
			return err
		}

		srv, err := mdns.NewServer(&mdns.Config{Zone: &mdns.DNSSDService{s}})
		if err != nil {
			return err
		}

		// append the wildcard entry
		entries = append(entries, &mdnsEntry{id: "*", node: srv})
	}

	var gerr error

	for _, node := range service.Nodes {
		// create hash of service; uint64
		h, err := hash.Hash(node, nil)
		if err != nil {
			gerr = err
			continue
		}

		var seen bool
		var e *mdnsEntry

		for _, entry := range entries {
			if node.Id == entry.id {
				seen = true
				e = entry
				break
			}
		}

		// already registered, continue
		if seen && e.hash == h {
			continue
			// hash doesn't match, shutdown
		} else if seen {
			e.node.Shutdown()
			// doesn't exist
		} else {
			e = &mdnsEntry{hash: h}
		}

		txt, err := encode(&mdnsTxt{
			Service:   service.Name,
			Version:   service.Version,
			Endpoints: service.Endpoints,
			Metadata:  node.Metadata,
		})

		if err != nil {
			gerr = err
			continue
		}

		// we got here, new node
		s, err := mdns.NewMDNSService(
			node.Id,
			service.Name,
			"",
			"",
			node.Port,
			[]net.IP{net.ParseIP(node.Address)},
			txt,
		)
		if err != nil {
			gerr = err
			continue
		}

		srv, err := mdns.NewServer(&mdns.Config{Zone: s})
		if err != nil {
			gerr = err
			continue
		}

		e.id = node.Id
		e.node = srv
		entries = append(entries, e)
	}

	// save
//.........這裏部分代碼省略.........

func (p *ECSEnvironmentProperties) ReplacementHash() (uint64, error) {
	return hashstructure.Hash(p, nil)
}

func (e *etcdv3Registry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
	if len(s.Nodes) == 0 {
		return errors.New("Require at least one node")
	}

	//refreshing lease if existing
	leaseID, ok := e.leases[s.Name]
	if ok {
		_, err := e.client.KeepAliveOnce(context.TODO(), leaseID)
		if err != nil {
			return err
		}
	}

	var options registry.RegisterOptions
	for _, o := range opts {
		o(&options)
	}

	// create hash of service; uint64
	h, err := hash.Hash(s, nil)
	if err != nil {
		return err
	}

	// get existing hash
	e.Lock()
	v, ok := e.register[s.Name]
	e.Unlock()

	// the service is unchanged, skip registering
	if ok && v == h {
		return nil
	}

	service := &registry.Service{
		Name:      s.Name,
		Version:   s.Version,
		Metadata:  s.Metadata,
		Endpoints: s.Endpoints,
	}

	ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
	defer cancel()

	var lgr *clientv3.LeaseGrantResponse
	if options.TTL.Seconds() > 0 {
		lgr, err = e.client.Grant(ctx, int64(options.TTL.Seconds()))
		if err != nil {
			return err
		}
	}

	for _, node := range s.Nodes {
		service.Nodes = []*registry.Node{node}
		if lgr != nil {
			_, err = e.client.Put(ctx, nodePath(service.Name, node.Id), encode(service), clientv3.WithLease(lgr.ID))
		} else {
			_, err = e.client.Put(ctx, nodePath(service.Name, node.Id), encode(service))
		}
		if err != nil {
			return err
		}
	}

	e.Lock()
	// save our hash of the service
	e.register[s.Name] = h
	// save our leaseID of the service
	if lgr != nil {
		e.leases[s.Name] = lgr.ID
	}
	e.Unlock()

	return nil
}

func (c *consulRegistry) Register(s *Service, opts ...RegisterOption) error {
	if len(s.Nodes) == 0 {
		return errors.New("Require at least one node")
	}

	var options RegisterOptions
	for _, o := range opts {
		o(&options)
	}

	// create hash of service; uint64
	h, err := hash.Hash(s, nil)
	if err != nil {
		return err
	}

	// use first node
	node := s.Nodes[0]

	// get existing hash
	c.Lock()
	v, ok := c.register[s.Name]
	c.Unlock()

	// if it's already registered and matches then just pass the check
	if ok && v == h {
		// if the err is nil we're all good, bail out
		// if not, we don't know what the state is, so full re-register
		if err := c.Client.Agent().PassTTL("service:"+node.Id, ""); err == nil {
			return nil
		}
	}

	// encode the tags
	tags := encodeMetadata(node.Metadata)
	tags = append(tags, encodeEndpoints(s.Endpoints)...)
	tags = append(tags, encodeVersion(s.Version)...)

	var check *consul.AgentServiceCheck

	// if the TTL is greater than 0 create an associated check
	if options.TTL > time.Duration(0) {
		check = &consul.AgentServiceCheck{
			TTL: fmt.Sprintf("%v", options.TTL),
		}
	}

	// register the service
	if err := c.Client.Agent().ServiceRegister(&consul.AgentServiceRegistration{
		ID:      node.Id,
		Name:    s.Name,
		Tags:    tags,
		Port:    node.Port,
		Address: node.Address,
		Check:   check,
	}); err != nil {
		return err
	}

	// save our hash of the service
	c.Lock()
	c.register[s.Name] = h
	c.Unlock()

	// if the TTL is 0 we don't mess with the checks
	if options.TTL == time.Duration(0) {
		return nil
	}

	// pass the healthcheck
	return c.Client.Agent().PassTTL("service:"+node.Id, "")
}