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Adding a simple allocator service that acts as a reverse proxy.
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| Original file line number | Diff line number | Diff line change |
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| # Copyright 2019 Google LLC All Rights Reserved. | ||
| # | ||
| # 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. | ||
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| FROM alpine:3.8 | ||
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| RUN apk --update add ca-certificates && \ | ||
| adduser -D agones | ||
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| COPY --chown=agones:root ./bin/allocator /home/agones/allocator | ||
| COPY --chown=agones:root ./bin/LICENSES ./bin/dependencies-src.tgz /home/agones/ | ||
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| USER agones | ||
| ENTRYPOINT ["/home/agones/allocator"] |
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| // Copyright 2019 Google LLC All Rights Reserved. | ||
| // | ||
| // 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 | ||
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| import ( | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "os" | ||
| "strings" | ||
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| allocationv1alpha1 "agones.dev/agones/pkg/apis/allocation/v1alpha1" | ||
| "agones.dev/agones/pkg/client/clientset/versioned" | ||
| "agones.dev/agones/pkg/util/runtime" | ||
| k8serror "k8s.io/apimachinery/pkg/api/errors" | ||
| "k8s.io/client-go/rest" | ||
| ) | ||
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| var ( | ||
| logger = runtime.NewLoggerWithSource("main") | ||
| ) | ||
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| const ( | ||
| certDir = "/home/allocator/client-certs/" | ||
| tlsDir = "/home/allocator/tls/" | ||
| port = "8443" | ||
| ) | ||
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| // A handler for the web server | ||
| type handler func(w http.ResponseWriter, r *http.Request) | ||
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| func main() { | ||
| agonesClient, err := getAgonesClient() | ||
| if err != nil { | ||
| logger.WithError(err).Fatal("could not create agones client") | ||
| } | ||
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| h := httpHandler{ | ||
| agonesClient: agonesClient, | ||
| namespace: os.Getenv("NAMESPACE"), | ||
| } | ||
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| // TODO: add liveness probe | ||
| http.HandleFunc("/v1alpha1/gameserverallocation", h.postOnly(h.allocateHandler)) | ||
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| caCertPool, err := getCaCertPool(certDir) | ||
| if err != nil { | ||
| logger.WithError(err).Fatal("could not get CA certs") | ||
| } | ||
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| cfg := &tls.Config{ | ||
| ClientAuth: tls.RequireAndVerifyClientCert, | ||
| ClientCAs: caCertPool, | ||
| } | ||
| srv := &http.Server{ | ||
| Addr: ":" + port, | ||
| TLSConfig: cfg, | ||
| } | ||
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| err = srv.ListenAndServeTLS(tlsDir+"tls.crt", tlsDir+"tls.key") | ||
| logger.WithError(err).Fatal("allocation service crashed") | ||
| } | ||
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| // Set up our client which we will use to call the API | ||
| func getAgonesClient() (*versioned.Clientset, error) { | ||
| // Create the in-cluster config | ||
| config, err := rest.InClusterConfig() | ||
| if err != nil { | ||
| return nil, errors.New("Could not create in cluster config") | ||
| } | ||
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| // Access to the Agones resources through the Agones Clientset | ||
| agonesClient, err := versioned.NewForConfig(config) | ||
| if err != nil { | ||
| return nil, errors.New("Could not create the agones api clientset") | ||
| } | ||
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| return agonesClient, nil | ||
| } | ||
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| func getCaCertPool(path string) (*x509.CertPool, error) { | ||
| // Add all certificates under client-certs path because there could be multiple clusters | ||
| // and all client certs should be added. | ||
| caCertPool := x509.NewCertPool() | ||
| filesInfo, err := ioutil.ReadDir(path) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error reading certs from dir %s: %s", path, err.Error()) | ||
| } | ||
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| for _, file := range filesInfo { | ||
| if strings.HasSuffix(file.Name(), ".crt") || strings.HasSuffix(file.Name(), ".pem") { | ||
| certFile := path + file.Name() | ||
| caCert, err := ioutil.ReadFile(certFile) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("ca cert is not readable or missing: %s", err.Error()) | ||
| } | ||
| if !caCertPool.AppendCertsFromPEM(caCert) { | ||
| return nil, fmt.Errorf("client cert %s cannot be installed", certFile) | ||
| } | ||
| logger.Infof("client cert %s is installed", certFile) | ||
| } | ||
| } | ||
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| return caCertPool, nil | ||
| } | ||
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| // Limit verbs the web server handles | ||
| func (h *httpHandler) postOnly(in handler) handler { | ||
| return func(w http.ResponseWriter, r *http.Request) { | ||
| if r.Method == "POST" { | ||
| in(w, r) | ||
| return | ||
| } | ||
| http.Error(w, "method not allowed", http.StatusMethodNotAllowed) | ||
| } | ||
| } | ||
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| type httpHandler struct { | ||
| agonesClient versioned.Interface | ||
| namespace string | ||
| } | ||
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| func (h *httpHandler) allocateHandler(w http.ResponseWriter, r *http.Request) { | ||
| gsa := allocationv1alpha1.GameServerAllocation{} | ||
| if err := json.NewDecoder(r.Body).Decode(&gsa); err != nil { | ||
| http.Error(w, err.Error(), http.StatusBadRequest) | ||
| } | ||
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| allocation := h.agonesClient.AllocationV1alpha1().GameServerAllocations(h.namespace) | ||
| allocatedGsa, err := allocation.Create(&gsa) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), httpCode(err)) | ||
| } | ||
| w.Header().Set("Content-Type", "application/json") | ||
| result, _ := json.Marshal(allocatedGsa) | ||
| _, err = io.WriteString(w, string(result)) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| } | ||
| } | ||
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| func httpCode(err error) int { | ||
| code := http.StatusInternalServerError | ||
| switch t := err.(type) { | ||
| case k8serror.APIStatus: | ||
| code = int(t.Status().Code) | ||
| } | ||
| return code | ||
| } |
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