diff --git a/services/ping-discovery/Dockerfile b/services/ping-discovery/Dockerfile new file mode 100644 index 0000000..4749bed --- /dev/null +++ b/services/ping-discovery/Dockerfile @@ -0,0 +1,34 @@ +# +# Copyright 2023 Google LLC +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +FROM golang:1.19 as build + +WORKDIR /go/src/ping-discovery +COPY . . + +RUN go mod download +RUN go vet -v +RUN go test -v + +RUN CGO_ENABLED=0 go build -o /go/bin/ping-discovery + +FROM gcr.io/distroless/static-debian11:nonroot + +COPY --from=build /go/bin/ping-discovery / + +ENV GIN_MODE=release +USER nonroot:nonroot +CMD ["/ping-discovery"] diff --git a/services/ping-discovery/README.md b/services/ping-discovery/README.md new file mode 100644 index 0000000..aecd760 --- /dev/null +++ b/services/ping-discovery/README.md @@ -0,0 +1,75 @@ +# Ping Discovery Service + +This service will inspect a Google Cloud project for +[Agones Latency Ping endpoints](https://agones.dev/site/docs/guides/ping-service/), and return one for each region +that Agones is installed. + +The Service will choose an endpoint at random on each request for each region, assuming there are more than one. +This is to distribute the load amongst clusters. + +## API + + + + + + + + + + + + + + + + +
EndpointInputReturnDescription
GET /list None + 
+{
+    "asia-east1": {
+        "Name": "agones-ping-udp-service",
+        "Namespace": "agones-system",
+        "Region": "asia-east1",
+        "Address": "104.155.211.151",
+        "Protocol": "UDP"
+    },
+    "europe-west1": {
+        "Name": "agones-ping-udp-service",
+        "Namespace": "agones-system",
+        "Region": "europe-west1",
+        "Address": "34.22.151.131",
+        "Protocol": "UDP"
+    },
+    "us-central1": {
+        "Name": "agones-ping-udp-service",
+        "Namespace": "agones-system",
+        "Region": "us-central1",
+        "Address": "35.227.137.95",
+        "Protocol": "UDP"
+    }
+}
+
+ 		+ Map of region, where the key is the region name, and a singular + endpoint for the UDP ping service for each region as the value. +
+ +## Running locally + +When running locally, make sure you have [gcloud](https://cloud.google.com/sdk/docs/install) installed, +and a default project authenticated and configured, so that the binary can determine the project it should be +scanning for +Ping endpoints. + +```shell +go run main.go +``` + +## Building image + +```shell +docker build . -t ping-discovery +``` + +Note: The docker image will fail locally, since it has no access Google Cloud Application Default Credentials. diff --git a/services/ping-discovery/go.mod b/services/ping-discovery/go.mod new file mode 100644 index 0000000..188e69b --- /dev/null +++ b/services/ping-discovery/go.mod @@ -0,0 +1,47 @@ +module ping-discovery + +go 1.19 + +require ( + cloud.google.com/go/compute v1.18.0 + github.com/gin-gonic/gin v1.9.0 + github.com/jellydator/ttlcache/v3 v3.0.1 + golang.org/x/oauth2 v0.5.0 + google.golang.org/api v0.108.0 +) + +require ( + cloud.google.com/go/compute/metadata v0.2.3 // indirect + github.com/bytedance/sonic v1.8.0 // indirect + github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect + github.com/gin-contrib/sse v0.1.0 // indirect + github.com/go-playground/locales v0.14.1 // indirect + github.com/go-playground/universal-translator v0.18.1 // indirect + github.com/go-playground/validator/v10 v10.11.2 // indirect + github.com/goccy/go-json v0.10.0 // indirect + github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.2.1 // indirect + github.com/googleapis/gax-go/v2 v2.7.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/klauspost/cpuid/v2 v2.0.9 // indirect + github.com/leodido/go-urn v1.2.1 // indirect + github.com/mattn/go-isatty v0.0.17 // indirect + github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/pelletier/go-toml/v2 v2.0.6 // indirect + github.com/twitchyliquid64/golang-asm v0.15.1 // indirect + github.com/ugorji/go/codec v1.2.9 // indirect + go.opencensus.io v0.24.0 // indirect + golang.org/x/arch v0.0.0-20210923205945-b76863e36670 // indirect + golang.org/x/crypto v0.5.0 // indirect + golang.org/x/net v0.7.0 // indirect + golang.org/x/sync v0.1.0 // indirect + golang.org/x/sys v0.5.0 // indirect + golang.org/x/text v0.7.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/genproto v0.0.0-20230124163310-31e0e69b6fc2 // indirect + google.golang.org/grpc v1.51.0 // indirect + google.golang.org/protobuf v1.28.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/services/ping-discovery/go.sum b/services/ping-discovery/go.sum new file mode 100644 index 0000000..96e9ee5 --- /dev/null +++ b/services/ping-discovery/go.sum @@ -0,0 +1,193 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 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+1,246 @@ +/* + * Copyright 2023 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package main + +import ( + "context" + "encoding/json" + "errors" + "fmt" + "log" + "math/rand" + "net/http" + "os/exec" + "strings" + "time" + + compute "cloud.google.com/go/compute/apiv1" + "cloud.google.com/go/compute/apiv1/computepb" + "github.com/gin-gonic/gin" + "github.com/jellydator/ttlcache/v3" + "golang.org/x/oauth2/google" + "google.golang.org/api/iterator" +) + +const ( + cacheKey = "json" + external = "EXTERNAL" + pingServiceName = "agones-ping-udp-service" +) + +func main() { + ctx := context.Background() + + forwardingClient, err := compute.NewForwardingRulesRESTClient(ctx) + if err != nil { + log.Fatalf("could not get forwarding client: %s", err) + } + defer forwardingClient.Close() + cache := newCache(ctx, forwardingClient) + + r := gin.Default() + if err := r.SetTrustedProxies(nil); err != nil { + log.Fatalf("error setting trusted proxy: %s", err) + } + r.GET("/list", func(c *gin.Context) { + services, err := getPingServicePerRegion(cache) + if err != nil { + c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()}) + return + } + + log.Printf("%v", services) + c.JSON(http.StatusOK, services) + }) + + if err = r.Run(); err != nil { + log.Fatal(err) + } +} + +// Service is the details of an individual Ping Service endpoint. +type Service struct { + Name string + Namespace string + Region string + Address string + Protocol string +} + +func newCache(ctx context.Context, forwardingClient *compute.ForwardingRulesClient) *ttlcache.Cache[string, []Service] { + loader := ttlcache.LoaderFunc[string, []Service]( + func(c *ttlcache.Cache[string, []Service], key string) *ttlcache.Item[string, []Service] { + + services, err := listPingServices(ctx, forwardingClient) + if err != nil { + log.Printf("Error getting ping services: %s", err) + return nil + } + + // load from file/make an HTTP request + item := c.Set(cacheKey, services, ttlcache.DefaultTTL) + return item + }, + ) + + // Add some jitter to avoid multiple hits to the API at the same time on expiration. + jitter := time.Duration(rand.Int63n(30)) * time.Second + cache := ttlcache.New[string, []Service]( + ttlcache.WithLoader[string, []Service](loader), + // only retrieve the information around once a minute + ttlcache.WithTTL[string, []Service](time.Minute+jitter), + ) + return cache +} + +// getPingServicePerRegion returns one randomly selected UDP ping service per region for this project. +// The key in the map is the region, and the Service is the details of the Service. +func getPingServicePerRegion(c *ttlcache.Cache[string, []Service]) (map[string]Service, error) { + item := c.Get(cacheKey) + if item == nil { + return nil, errors.New("cached service list not found") + } + + list := item.Value() + result := map[string]Service{} + // randomise it so pings are routed to a variety of clusters. + rand.Shuffle(len(list), func(i, j int) { + list[i], list[j] = list[j], list[i] + }) + + for _, s := range list { + if s.Name == pingServiceName { + result[s.Region] = s + } + } + + return result, nil +} + +func listPingServices(ctx context.Context, c *compute.ForwardingRulesClient) ([]Service, error) { + list, err := listGKEServices(ctx, c) + if err != nil { + return nil, err + } + + if len(list) == 0 { + return nil, errors.New("no external endpoints found") + } + + var result []Service + for _, s := range list { + if s.Name == pingServiceName { + result = append(result, s) + } + } + + return result, nil +} + +// listGKEServices lists all GKE Services that are exposed publicly in the project. +func listGKEServices(ctx context.Context, c *compute.ForwardingRulesClient) ([]Service, error) { + project, err := findProject(ctx) + if err != nil { + return nil, err + } + + req := &computepb.AggregatedListForwardingRulesRequest{ + Project: project, + } + + var result []Service + + it := c.AggregatedList(ctx, req) + for { + resp, err := it.Next() + if err == iterator.Done { + break + } + if err != nil { + return nil, err + } + + for _, rule := range resp.Value.GetForwardingRules() { + if rule.GetLoadBalancingScheme() == external { + jsn := rule.GetDescription() + if len(jsn) == 0 { + continue + } + + var desc map[string]string + err := json.Unmarshal([]byte(jsn), &desc) + if err != nil { + log.Printf("Warning: Not JSON: %s", jsn) + } + + serviceName, ok := desc["kubernetes.io/service-name"] + if !ok { + continue + } + split := strings.Split(serviceName, "/") + if len(split) != 2 { + continue + } + + region := strings.Split(rule.GetRegion(), "/") + + svc := Service{ + Name: split[1], + Namespace: split[0], + Region: region[len(region)-1], + Address: rule.GetIPAddress(), + Protocol: rule.GetIPProtocol(), + } + + log.Printf("Service: %+v", svc) + + result = append(result, svc) + } + } + } + + return result, nil +} + +// findProject uses several mechanisms to attempt to find the current project id. +func findProject(ctx context.Context) (string, error) { + // Attempt to use the service accounts credentials. + creds, err := google.FindDefaultCredentials(ctx) + if err != nil { + return "", fmt.Errorf("could not find default credentials: %w", err) + } + + // Local machine has no service credentials, so will return blank + if len(creds.ProjectID) > 0 { + log.Printf("Found project: [%s]", creds.ProjectID) + return creds.ProjectID, nil + } + + // Assume at this point we are on a local machine, with gcloud installed. + cmd := exec.Command("gcloud", "info", "--format", "value(config.project)") + var out strings.Builder + cmd.Stdout = &out + cmd.Stderr = &out + err = cmd.Run() + if err != nil { + return "", fmt.Errorf("error executing gcloud command (%s) to lookup project: %w. %s", cmd.String(), err, out.String()) + } + + project := strings.TrimSpace(out.String()) + log.Printf("Found project: [%s]", project) + return project, nil +}