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streaming: move ServiceTag and NodeMetaFiltering to the cache-entry 

So that all the client side filtering is in the same place. Previously
only the bexpr filter was in the cache-entry.

Also makes a small change to the filtering so that instead of rebuilding
slices of items, the filtering can return a bool to determine if the
event payload is saved or not.
This commit is contained in:
Daniel Nephin 2021-02-08 18:54:37 -05:00
parent 5bee19ee16
commit d5cc206e39
4 changed files with 298 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
agent/cache-types/streaming_health_services.go
View File

@ -5,6 +5,7 @@ import (
"fmt"
"reflect"
"sort"
"strings"
"time"
"github.com/hashicorp/go-bexpr"
@ -82,7 +83,7 @@ func (c *StreamingHealthServices) Fetch(opts cache.FetchOptions, req cache.Reque
return req
}
materializer, err := newMaterializer(c.deps, newReqFn, srvReq.Filter)
materializer, err := newMaterializer(c.deps, newReqFn, srvReq)
if err != nil {
return cache.FetchResult{}, err
}
@ -100,9 +101,9 @@ func (c *StreamingHealthServices) Fetch(opts cache.FetchOptions, req cache.Reque
func newMaterializer(
deps MaterializerDeps,
newRequestFn func(uint64) pbsubscribe.SubscribeRequest,
filter string,
req *structs.ServiceSpecificRequest,
) (*submatview.Materializer, error) {
view, err := newHealthView(filter)
view, err := newHealthView(req)
if err != nil {
return nil, err
}
@ -139,8 +140,8 @@ func (s *streamingHealthState) Fetch(opts cache.FetchOptions) (cache.FetchResult
return result, err
}
func newHealthView(filterExpr string) (*healthView, error) {
fe, err := newFilterEvaluator(filterExpr)
func newHealthView(req *structs.ServiceSpecificRequest) (*healthView, error) {
fe, err := newFilterEvaluator(req)
if err != nil {
return nil, err
}
@ -192,11 +193,44 @@ type filterEvaluator interface {
Evaluate(datum interface{}) (bool, error)
}
func newFilterEvaluator(expr string) (filterEvaluator, error) {
if expr == "" {
return noopFilterEvaluator{}, nil
func newFilterEvaluator(req *structs.ServiceSpecificRequest) (filterEvaluator, error) {
var evaluators []filterEvaluator
typ := reflect.TypeOf(structs.CheckServiceNode{})
if req.Filter != "" {
e, err := bexpr.CreateEvaluatorForType(req.Filter, nil, typ)
if err != nil {
return nil, err
}
evaluators = append(evaluators, e)
}
if req.ServiceTag != "" {
// Handle backwards compat with old field
req.ServiceTags = []string{req.ServiceTag}
}
if req.TagFilter && len(req.ServiceTags) > 0 {
evaluators = append(evaluators, serviceTagEvaluator{tags: req.ServiceTags})
}
for key, value := range req.NodeMetaFilters {
expr := fmt.Sprintf(`"%s" in Node.Meta.%s`, value, key)
e, err := bexpr.CreateEvaluatorForType(expr, nil, typ)
if err != nil {
return nil, err
}
evaluators = append(evaluators, e)
}
switch len(evaluators) {
case 0:
return noopFilterEvaluator{}, nil
case 1:
return evaluators[0], nil
default:
return &multiFilterEvaluator{evaluators: evaluators}, nil
}
return bexpr.CreateEvaluatorForType(expr, nil, reflect.TypeOf(structs.CheckServiceNode{}))
}
// noopFilterEvaluator may be used in place of a bexpr.Evaluator. The Evaluate
@ -207,6 +241,20 @@ func (noopFilterEvaluator) Evaluate(_ interface{}) (bool, error) {
return true, nil
}
type multiFilterEvaluator struct {
evaluators []filterEvaluator
}
func (m multiFilterEvaluator) Evaluate(data interface{}) (bool, error) {
for _, e := range m.evaluators {
match, err := e.Evaluate(data)
if !match || err != nil {
return match, err
}
}
return true, nil
}
// sortCheckServiceNodes sorts the results to match memdb semantics
// Sort results by Node.Node, if 2 instances match, order by Service.ID
// Will allow result to be stable sorted and match queries without cache
@ -240,3 +288,34 @@ func (s *healthView) Result(index uint64) (interface{}, error) {
func (s *healthView) Reset() {
s.state = make(map[string]structs.CheckServiceNode)
}
// serviceTagEvaluator implements the filterEvaluator to perform filtering
// by service tags. bexpr can not be used at this time, because the filtering
// must be case insensitive for backwards compatibility. In the future this
// may be replaced with bexpr once case insensitive support is added.
type serviceTagEvaluator struct {
tags []string
}
func (m serviceTagEvaluator) Evaluate(data interface{}) (bool, error) {
csn, ok := data.(structs.CheckServiceNode)
if !ok {
return false, fmt.Errorf("unexpected type %T for structs.CheckServiceNode filter", data)
}
for _, tag := range m.tags {
if !serviceHasTag(csn.Service, tag) {
// If any one of the expected tags was not found, filter the service
return false, nil
}
}
return true, nil
}
func serviceHasTag(sn *structs.NodeService, tag string) bool {
for _, t := range sn.Tags {
if strings.EqualFold(t, tag) {
return true
}
}
return false
}

208
agent/cache-types/streaming_health_services_test.go
View File

@ -568,3 +568,211 @@ func runStep(t *testing.T, name string, fn func(t *testing.T)) {
t.FailNow()
}
}
func TestNewFilterEvaluator(t *testing.T) {
type testCase struct {
name string
req structs.ServiceSpecificRequest
data structs.CheckServiceNode
expected bool
}
fn := func(t *testing.T, tc testCase) {
e, err := newFilterEvaluator(&tc.req)
require.NoError(t, err)
actual, err := e.Evaluate(tc.data)
require.NoError(t, err)
require.Equal(t, tc.expected, actual)
}
var testCases = []testCase{
{
name: "single ServiceTags match",
req: structs.ServiceSpecificRequest{
ServiceTags: []string{"match"},
TagFilter: true,
},
data: structs.CheckServiceNode{
Service: &structs.NodeService{
Tags: []string{"extra", "match"},
},
},
expected: true,
},
{
name: "single deprecated ServiceTag match",
req: structs.ServiceSpecificRequest{
ServiceTag: "match",
TagFilter: true,
},
data: structs.CheckServiceNode{
Service: &structs.NodeService{
Tags: []string{"extra", "match"},
},
},
expected: true,
},
{
name: "single ServiceTags mismatch",
req: structs.ServiceSpecificRequest{
ServiceTags: []string{"other"},
TagFilter: true,
},
data: structs.CheckServiceNode{
Service: &structs.NodeService{
Tags: []string{"extra", "match"},
},
},
expected: false,
},
{
name: "multiple ServiceTags match",
req: structs.ServiceSpecificRequest{
ServiceTags: []string{"match", "second"},
TagFilter: true,
},
data: structs.CheckServiceNode{
Service: &structs.NodeService{
Tags: []string{"extra", "match", "second"},
},
},
expected: true,
},
{
name: "multiple ServiceTags mismatch",
req: structs.ServiceSpecificRequest{
ServiceTags: []string{"match", "not"},
TagFilter: true,
},
data: structs.CheckServiceNode{
Service: &structs.NodeService{
Tags: []string{"extra", "match"},
},
},
expected: false,
},
{
name: "single NodeMetaFilter match",
req: structs.ServiceSpecificRequest{
NodeMetaFilters: map[string]string{"meta1": "match"},
},
data: structs.CheckServiceNode{
Node: &structs.Node{
Meta: map[string]string{
"meta1": "match",
"extra": "some",
},
},
},
expected: true,
},
{
name: "single NodeMetaFilter mismatch",
req: structs.ServiceSpecificRequest{
NodeMetaFilters: map[string]string{
"meta1": "match",
},
},
data: structs.CheckServiceNode{
Node: &structs.Node{
Meta: map[string]string{
"meta1": "other",
"extra": "some",
},
},
},
expected: false,
},
{
name: "multiple NodeMetaFilter match",
req: structs.ServiceSpecificRequest{
NodeMetaFilters: map[string]string{"meta1": "match", "meta2": "a"},
},
data: structs.CheckServiceNode{
Node: &structs.Node{
Meta: map[string]string{
"meta1": "match",
"meta2": "a",
"extra": "some",
},
},
},
expected: true,
},
{
name: "multiple NodeMetaFilter mismatch",
req: structs.ServiceSpecificRequest{
NodeMetaFilters: map[string]string{
"meta1": "match",
"meta2": "beta",
},
},
data: structs.CheckServiceNode{
Node: &structs.Node{
Meta: map[string]string{
"meta1": "other",
"meta2": "gamma",
},
},
},
expected: false,
},
{
name: "QueryOptions.Filter match",
req: structs.ServiceSpecificRequest{
QueryOptions: structs.QueryOptions{
Filter: `Node.Node == "node3"`,
},
},
data: structs.CheckServiceNode{
Node: &structs.Node{Node: "node3"},
},
expected: true,
},
{
name: "QueryOptions.Filter mismatch",
req: structs.ServiceSpecificRequest{
QueryOptions: structs.QueryOptions{
Filter: `Node.Node == "node2"`,
},
},
data: structs.CheckServiceNode{
Node: &structs.Node{Node: "node3"},
},
expected: false,
},
{
name: "all match",
req: structs.ServiceSpecificRequest{
QueryOptions: structs.QueryOptions{
Filter: `Node.Node == "node3"`,
},
ServiceTags: []string{"tag1", "tag2"},
NodeMetaFilters: map[string]string{
"meta1": "match1",
"meta2": "match2",
},
},
data: structs.CheckServiceNode{
Node: &structs.Node{
Node: "node3",
Meta: map[string]string{
"meta1": "match1",
"meta2": "match2",
"extra": "other",
},
},
Service: &structs.NodeService{
Tags: []string{"tag1", "tag2", "extra"},
},
},
expected: true,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
fn(t, tc)
})
}
}

2
agent/dns_test.go
View File

@ -3100,7 +3100,7 @@ func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
}
if len(in.Answer) != 1 {
t.Fatalf("empty lookup: %#v", in)
t.Fatalf("question %v, empty lookup: %#v", question, in)
}
})
}

64
agent/rpcclient/health/health.go
View File

@ -2,7 +2,6 @@ package health
import (
"context"
"strings"
"github.com/hashicorp/consul/agent/cache"
"github.com/hashicorp/consul/agent/structs"
@ -70,66 +69,5 @@ func (c *Client) getServiceNodes(
panic("wrong response type for cachetype.HealthServicesName")
}
return filterTags(filterNodeMeta(value, req), req), md, nil
}
func filterTags(out *structs.IndexedCheckServiceNodes, req structs.ServiceSpecificRequest) structs.IndexedCheckServiceNodes {
if !req.TagFilter || len(req.ServiceTags) == 0 || len(out.Nodes) == 0 {
return *out
}
tags := make([]string, 0, len(req.ServiceTags))
for _, r := range req.ServiceTags {
tags = append(tags, strings.ToLower(r))
}
results := make(structs.CheckServiceNodes, 0, len(out.Nodes))
for _, service := range out.Nodes {
svc := service.Service
if !serviceTagsFilter(svc, tags) {
results = append(results, service)
}
}
out.Nodes = results
return *out
}
// serviceTagsFilter return true if service does not contains all the given tags
func serviceTagsFilter(sn *structs.NodeService, tags []string) bool {
for _, tag := range tags {
if serviceTagFilter(sn, tag) {
// If any one of the expected tags was not found, filter the service
return true
}
}
// If all tags were found, don't filter the service
return false
}
// serviceTagFilter returns true (should filter) if the given service node
// doesn't contain the given tag.
func serviceTagFilter(sn *structs.NodeService, tag string) bool {
// Look for the lower cased version of the tag.
for _, t := range sn.Tags {
if strings.ToLower(t) == tag {
return false
}
}
// If we didn't hit the tag above then we should filter.
return true
}
func filterNodeMeta(out *structs.IndexedCheckServiceNodes, req structs.ServiceSpecificRequest) *structs.IndexedCheckServiceNodes {
if len(req.NodeMetaFilters) == 0 || len(out.Nodes) == 0 {
return out
}
results := make(structs.CheckServiceNodes, 0, len(out.Nodes))
for _, service := range out.Nodes {
serviceNode := service.Node
if structs.SatisfiesMetaFilters(serviceNode.Meta, req.NodeMetaFilters) {
results = append(results, service)
}
}
out.Nodes = results
return out
return *value, md, nil
}