Merge pull request #9703 from pierresouchay/streaming_tags_and_case_insensitive

Streaming filter tags + case insensitive lookups for Service Names

.changelog/9703.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+streaming: lookup in health properly handle case-sensitivity and perform filtering based on tags and node-meta
+```

agent/cache-types/streaming_health_services.go

@@ -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
+}

agent/cache-types/streaming_health_services_test.go

@@ -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)
+		})
+	}
+}

agent/consul/state/catalog_events.go

@@ -1,6 +1,8 @@
 package state
 
 import (
+	"strings"
+
 	memdb "github.com/hashicorp/go-memdb"
 
 	"github.com/hashicorp/consul/acl"
@@ -42,7 +44,7 @@ func (e EventPayloadCheckServiceNode) MatchesKey(key, namespace string) bool {
 		name = e.key
 	}
 	ns := e.Value.Service.EnterpriseMeta.GetNamespace()
-	return (key == "" || key == name) && (namespace == "" || namespace == ns)
+	return (key == "" || strings.EqualFold(key, name)) && (namespace == "" || namespace == ns)
 }
 
 // serviceHealthSnapshot returns a stream.SnapshotFunc that provides a snapshot

agent/dns.go

@@ -1171,12 +1171,16 @@ func (d *DNSServer) trimDNSResponse(cfg *dnsConfig, network string, req, resp *d
 
 // lookupServiceNodes returns nodes with a given service.
 func (d *DNSServer) lookupServiceNodes(cfg *dnsConfig, lookup serviceLookup) (structs.IndexedCheckServiceNodes, error) {
+	serviceTags := []string{}
+	if lookup.Tag != "" {
+		serviceTags = []string{lookup.Tag}
+	}
 	args := structs.ServiceSpecificRequest{
 		Connect:     lookup.Connect,
 		Ingress:     lookup.Ingress,
 		Datacenter:  lookup.Datacenter,
 		ServiceName: lookup.Service,
-		ServiceTags: []string{lookup.Tag},
+		ServiceTags: serviceTags,
 		TagFilter:   lookup.Tag != "",
 		QueryOptions: structs.QueryOptions{
 			Token:            d.agent.tokens.UserToken(),

agent/dns_test.go

@@ -3016,7 +3016,24 @@ func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
 	}
 
 	t.Parallel()
-	a := NewTestAgent(t, "")
+	tests := []struct {
+		name   string
+		config string
+	}{
+		// UDP + EDNS
+		{"normal", ""},
+		{"cache", `dns_config{ allow_stale=true, max_stale="3h", use_cache=true, "cache_max_age"="3h"}`},
+		{"cache-with-streaming", `
+			rpc{
+				enable_streaming=true
+			}
+			use_streaming_backend=true
+			dns_config{ allow_stale=true, max_stale="3h", use_cache=true, "cache_max_age"="3h"}
+		    `},
+	}
+	for _, tst := range tests {
+		t.Run(fmt.Sprintf("A lookup %v", tst.name), func(t *testing.T) {
+			a := NewTestAgent(t, tst.config)
 			defer a.Shutdown()
 			testrpc.WaitForLeader(t, a.RPC, "dc1")
 
@@ -3059,6 +3076,7 @@ func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
 
 			// Try some variations to make sure case doesn't matter.
 			questions := []string{
+				"primary.Db.service.consul.",
 				"primary.db.service.consul.",
 				"pRIMARY.dB.service.consul.",
 				"PRIMARY.dB.service.consul.",
@@ -3069,19 +3087,24 @@ func TestDNS_CaseInsensitiveServiceLookup(t *testing.T) {
 				"SomeQuery.query.consul.",
 				"SOMEQUERY.query.consul.",
 			}
+
 			for _, question := range questions {
 				m := new(dns.Msg)
 				m.SetQuestion(question, dns.TypeSRV)
 
 				c := new(dns.Client)
+				retry.Run(t, func(r *retry.R) {
 					in, _, err := c.Exchange(m, a.DNSAddr())
 					if err != nil {
 						t.Fatalf("err: %v", err)
 					}
 
 					if len(in.Answer) != 1 {
-			t.Fatalf("empty lookup: %#v", in)
+						t.Fatalf("question %v, empty lookup: %#v", question, in)
 					}
+				})
+			}
+		})
 	}
 }
 

agent/health_endpoint_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http/httptest"
 	"net/url"
 	"reflect"
+	"strconv"
 	"testing"
 
 	"github.com/hashicorp/consul/agent/structs"
@@ -733,7 +734,23 @@ func TestHealthServiceNodes_NodeMetaFilter(t *testing.T) {
 	}
 
 	t.Parallel()
-	a := NewTestAgent(t, "")
+
+	tests := []struct {
+		name   string
+		config string
+	}{
+		{"normal", ""},
+		{"cache-with-streaming", `
+			rpc{
+				enable_streaming=true
+			}
+			use_streaming_backend=true
+		    `},
+	}
+	for _, tst := range tests {
+		t.Run(tst.name, func(t *testing.T) {
+
+			a := NewTestAgent(t, tst.config)
 			defer a.Shutdown()
 			testrpc.WaitForLeader(t, a.RPC, "dc1")
 
@@ -746,6 +763,9 @@ func TestHealthServiceNodes_NodeMetaFilter(t *testing.T) {
 
 			assertIndex(t, resp)
 
+			cIndex, err := strconv.ParseUint(resp.Header().Get("X-Consul-Index"), 10, 64)
+			require.NoError(t, err)
+
 			// Should be a non-nil empty list
 			nodes := obj.(structs.CheckServiceNodes)
 			if nodes == nil || len(nodes) != 0 {
@@ -768,7 +788,22 @@ func TestHealthServiceNodes_NodeMetaFilter(t *testing.T) {
 				t.Fatalf("err: %v", err)
 			}
 
-	req, _ = http.NewRequest("GET", "/v1/health/service/test?dc=dc1&node-meta=somekey:somevalue", nil)
+			args = &structs.RegisterRequest{
+				Datacenter: "dc1",
+				Node:       "bar2",
+				Address:    "127.0.0.1",
+				NodeMeta:   map[string]string{"somekey": "othervalue"},
+				Service: &structs.NodeService{
+					ID:      "test2",
+					Service: "test",
+				},
+			}
+
+			if err := a.RPC("Catalog.Register", args, &out); err != nil {
+				t.Fatalf("err: %v", err)
+			}
+
+			req, _ = http.NewRequest("GET", fmt.Sprintf("/v1/health/service/test?dc=dc1&node-meta=somekey:somevalue&index=%d&wait=10ms", cIndex), nil)
 			resp = httptest.NewRecorder()
 			obj, err = a.srv.HealthServiceNodes(resp, req)
 			if err != nil {
@@ -782,6 +817,8 @@ func TestHealthServiceNodes_NodeMetaFilter(t *testing.T) {
 			if len(nodes) != 1 || nodes[0].Checks == nil || len(nodes[0].Checks) != 0 {
 				t.Fatalf("bad: %v", obj)
 			}
+		})
+	}
 }
 
 func TestHealthServiceNodes_Filter(t *testing.T) {

agent/rpcclient/health/health.go

@@ -68,5 +68,6 @@ func (c *Client) getServiceNodes(
 	if !ok {
 		panic("wrong response type for cachetype.HealthServicesName")
 	}
+
 	return *value, md, nil
 }

agent/structs/structs.go

@@ -602,7 +602,7 @@ func (r *ServiceSpecificRequest) CacheInfo() cache.RequestInfo {
 	sort.Strings(r.ServiceTags)
 	v, err := hashstructure.Hash([]interface{}{
 		r.NodeMetaFilters,
-		r.ServiceName,
+		strings.ToLower(r.ServiceName),
 		// DEPRECATED (singular-service-tag) - remove this when upgrade RPC compat
 		// with 1.2.x is not required. We still need this in because <1.3 agents
 		// might still send RPCs with singular tag set. In fact the only place we