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discovery_chain_endpoint_test.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package agent
import (
"context"
"net/http"
"net/http/httptest"
"reflect"
"strings"
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/sdk/testutil/retry"
"github.com/hashicorp/consul/testrpc"
)
func TestDiscoveryChainRead(t *testing.T) {
if testing.Short() {
t.Skip("too slow for testing.Short")
}
t.Parallel()
a := NewTestAgent(t, "")
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
newTarget := func(opts structs.DiscoveryTargetOpts) *structs.DiscoveryTarget {
if opts.Namespace == "" {
opts.Namespace = "default"
}
if opts.Partition == "" {
opts.Partition = "default"
}
if opts.Datacenter == "" {
opts.Datacenter = "dc1"
}
t := structs.NewDiscoveryTarget(opts)
t.SNI = connect.TargetSNI(t, connect.TestClusterID+".consul")
t.Name = t.SNI
t.ConnectTimeout = 5 * time.Second // default
return t
}
targetWithConnectTimeout := func(t *structs.DiscoveryTarget, connectTimeout time.Duration) *structs.DiscoveryTarget {
t.ConnectTimeout = connectTimeout
return t
}
for _, method := range []string{"GET", "POST"} {
require.True(t, t.Run(method+": error on no service name", func(t *testing.T) {
var (
req *http.Request
err error
)
if method == "GET" {
req, err = http.NewRequest("GET", "/v1/discovery-chain/", nil)
} else {
apiReq := &discoveryChainReadRequest{}
req, err = http.NewRequest("POST", "/v1/discovery-chain/", jsonReader(apiReq))
}
require.NoError(t, err)
resp := httptest.NewRecorder()
_, err = a.srv.DiscoveryChainRead(resp, req)
require.Error(t, err)
require.True(t, isHTTPBadRequest(err))
}))
require.True(t, t.Run(method+": read default chain", func(t *testing.T) {
var (
req *http.Request
err error
)
if method == "GET" {
req, err = http.NewRequest("GET", "/v1/discovery-chain/web", nil)
} else {
apiReq := &discoveryChainReadRequest{}
req, err = http.NewRequest("POST", "/v1/discovery-chain/web", jsonReader(apiReq))
}
require.NoError(t, err)
resp := httptest.NewRecorder()
obj, err := a.srv.DiscoveryChainRead(resp, req)
require.NoError(t, err)
value := obj.(discoveryChainReadResponse)
expect := &structs.CompiledDiscoveryChain{
ServiceName: "web",
Namespace: "default",
Partition: "default",
Datacenter: "dc1",
Protocol: "tcp",
Default: true,
StartNode: "resolver:web.default.default.dc1",
Nodes: map[string]*structs.DiscoveryGraphNode{
"resolver:web.default.default.dc1": {
Type: structs.DiscoveryGraphNodeTypeResolver,
Name: "web.default.default.dc1",
Resolver: &structs.DiscoveryResolver{
Default: true,
ConnectTimeout: 5 * time.Second,
Target: "web.default.default.dc1",
},
},
},
Targets: map[string]*structs.DiscoveryTarget{
"web.default.default.dc1": newTarget(structs.DiscoveryTargetOpts{Service: "web"}),
},
}
require.Equal(t, expect, value.Chain)
}))
require.True(t, t.Run(method+": read default chain; evaluate in dc2", func(t *testing.T) {
var (
req *http.Request
err error
)
if method == "GET" {
req, err = http.NewRequest("GET", "/v1/discovery-chain/web?compile-dc=dc2", nil)
} else {
apiReq := &discoveryChainReadRequest{}
req, err = http.NewRequest("POST", "/v1/discovery-chain/web?compile-dc=dc2", jsonReader(apiReq))
}
require.NoError(t, err)
resp := httptest.NewRecorder()
obj, err := a.srv.DiscoveryChainRead(resp, req)
require.NoError(t, err)
value := obj.(discoveryChainReadResponse)
expect := &structs.CompiledDiscoveryChain{
ServiceName: "web",
Namespace: "default",
Partition: "default",
Datacenter: "dc2",
Default: true,
Protocol: "tcp",
StartNode: "resolver:web.default.default.dc2",
Nodes: map[string]*structs.DiscoveryGraphNode{
"resolver:web.default.default.dc2": {
Type: structs.DiscoveryGraphNodeTypeResolver,
Name: "web.default.default.dc2",
Resolver: &structs.DiscoveryResolver{
Default: true,
ConnectTimeout: 5 * time.Second,
Target: "web.default.default.dc2",
},
},
},
Targets: map[string]*structs.DiscoveryTarget{
"web.default.default.dc2": newTarget(structs.DiscoveryTargetOpts{Service: "web", Datacenter: "dc2"}),
},
}
require.Equal(t, expect, value.Chain)
}))
require.True(t, t.Run(method+": read default chain with cache", func(t *testing.T) {
var (
req *http.Request
err error
)
if method == "GET" {
req, err = http.NewRequest("GET", "/v1/discovery-chain/web?cached", nil)
} else {
apiReq := &discoveryChainReadRequest{}
req, err = http.NewRequest("POST", "/v1/discovery-chain/web?cached", jsonReader(apiReq))
}
require.NoError(t, err)
resp := httptest.NewRecorder()
obj, err := a.srv.DiscoveryChainRead(resp, req)
require.NoError(t, err)
// The GET request primes the cache so the POST is a hit.
if method == "GET" {
// Should be a cache miss
require.Equal(t, "MISS", resp.Header().Get("X-Cache"))
} else {
// Should be a cache HIT now!
require.Equal(t, "HIT", resp.Header().Get("X-Cache"))
}
value := obj.(discoveryChainReadResponse)
expect := &structs.CompiledDiscoveryChain{
ServiceName: "web",
Namespace: "default",
Partition: "default",
Datacenter: "dc1",
Default: true,
Protocol: "tcp",
StartNode: "resolver:web.default.default.dc1",
Nodes: map[string]*structs.DiscoveryGraphNode{
"resolver:web.default.default.dc1": {
Type: structs.DiscoveryGraphNodeTypeResolver,
Name: "web.default.default.dc1",
Resolver: &structs.DiscoveryResolver{
Default: true,
ConnectTimeout: 5 * time.Second,
Target: "web.default.default.dc1",
},
},
},
Targets: map[string]*structs.DiscoveryTarget{
"web.default.default.dc1": newTarget(structs.DiscoveryTargetOpts{Service: "web"}),
},
}
require.Equal(t, expect, value.Chain)
}))
}
{ // Now create one config entry.
out := false
require.NoError(t, a.RPC(context.Background(), "ConfigEntry.Apply", &structs.ConfigEntryRequest{
Datacenter: "dc1",
Entry: &structs.ServiceResolverConfigEntry{
Kind: structs.ServiceResolver,
Name: "web",
ConnectTimeout: 33 * time.Second,
Failover: map[string]structs.ServiceResolverFailover{
"*": {
Datacenters: []string{"dc2"},
},
},
},
}, &out))
require.True(t, out)
}
// Ensure background refresh works
require.True(t, t.Run("GET: read modified chain", func(t *testing.T) {
retry.Run(t, func(r *retry.R) {
req, err := http.NewRequest("GET", "/v1/discovery-chain/web?cached", nil)
r.Check(err)
resp := httptest.NewRecorder()
obj, err := a.srv.DiscoveryChainRead(resp, req)
r.Check(err)
// Should be a cache hit! The data should've updated in the cache
// in the background so this should've been fetched directly from
// the cache.
if resp.Header().Get("X-Cache") != "HIT" {
r.Fatalf("should be a cache hit")
}
value := obj.(discoveryChainReadResponse)
expect := &structs.CompiledDiscoveryChain{
ServiceName: "web",
Namespace: "default",
Partition: "default",
Datacenter: "dc1",
Protocol: "tcp",
StartNode: "resolver:web.default.default.dc1",
Nodes: map[string]*structs.DiscoveryGraphNode{
"resolver:web.default.default.dc1": {
Type: structs.DiscoveryGraphNodeTypeResolver,
Name: "web.default.default.dc1",
Resolver: &structs.DiscoveryResolver{
ConnectTimeout: 33 * time.Second,
Target: "web.default.default.dc1",
Failover: &structs.DiscoveryFailover{
Targets: []string{"web.default.default.dc2"},
},
},
},
},
Targets: map[string]*structs.DiscoveryTarget{
"web.default.default.dc1": targetWithConnectTimeout(
newTarget(structs.DiscoveryTargetOpts{Service: "web"}),
33*time.Second,
),
"web.default.default.dc2": targetWithConnectTimeout(
newTarget(structs.DiscoveryTargetOpts{Service: "web", Datacenter: "dc2"}),
33*time.Second,
),
},
AutoVirtualIPs: []string{"240.0.0.1"},
ManualVirtualIPs: []string{},
}
if !reflect.DeepEqual(expect, value.Chain) {
r.Fatalf("should be equal: expected=%+v, got=%+v", expect, value.Chain)
}
})
}))
expectTarget_DC1 := targetWithConnectTimeout(
newTarget(structs.DiscoveryTargetOpts{Service: "web"}),
22*time.Second,
)
expectTarget_DC1.MeshGateway = structs.MeshGatewayConfig{
Mode: structs.MeshGatewayModeLocal,
}
expectTarget_DC2 := targetWithConnectTimeout(
newTarget(structs.DiscoveryTargetOpts{Service: "web", Datacenter: "dc2"}),
22*time.Second,
)
expectTarget_DC2.MeshGateway = structs.MeshGatewayConfig{
Mode: structs.MeshGatewayModeLocal,
}
expectModifiedWithOverrides := &structs.CompiledDiscoveryChain{
ServiceName: "web",
Namespace: "default",
Partition: "default",
Datacenter: "dc1",
Protocol: "grpc",
CustomizationHash: "98809527",
StartNode: "resolver:web.default.default.dc1",
Nodes: map[string]*structs.DiscoveryGraphNode{
"resolver:web.default.default.dc1": {
Type: structs.DiscoveryGraphNodeTypeResolver,
Name: "web.default.default.dc1",
Resolver: &structs.DiscoveryResolver{
ConnectTimeout: 22 * time.Second,
Target: "web.default.default.dc1",
Failover: &structs.DiscoveryFailover{
Targets: []string{"web.default.default.dc2"},
},
},
},
},
Targets: map[string]*structs.DiscoveryTarget{
expectTarget_DC1.ID: expectTarget_DC1,
expectTarget_DC2.ID: expectTarget_DC2,
},
AutoVirtualIPs: []string{"240.0.0.1"},
ManualVirtualIPs: []string{},
}
require.True(t, t.Run("POST: read modified chain with overrides (camel case)", func(t *testing.T) {
body := ` {
"OverrideMeshGateway": {
"Mode": "local"
},
"OverrideProtocol": "grpc",
"OverrideConnectTimeout": "22s"
} `
req, err := http.NewRequest("POST", "/v1/discovery-chain/web", strings.NewReader(body))
require.NoError(t, err)
resp := httptest.NewRecorder()
obj, err := a.srv.DiscoveryChainRead(resp, req)
require.NoError(t, err)
value := obj.(discoveryChainReadResponse)
require.Equal(t, expectModifiedWithOverrides, value.Chain)
}))
require.True(t, t.Run("POST: read modified chain with overrides (snake case)", func(t *testing.T) {
body := ` {
"override_mesh_gateway": {
"mode": "local"
},
"override_protocol": "grpc",
"override_connect_timeout": "22s"
} `
req, err := http.NewRequest("POST", "/v1/discovery-chain/web", strings.NewReader(body))
require.NoError(t, err)
resp := httptest.NewRecorder()
obj, err := a.srv.DiscoveryChainRead(resp, req)
require.NoError(t, err)
value := obj.(discoveryChainReadResponse)
require.Equal(t, expectModifiedWithOverrides, value.Chain)
}))
}