allocator draft

tools/allocator/README.md

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+# Thundernetes allocator tool
+
+Thanks for using the allocator tool for thundernetes. To use it:
+- `kubectl` is required to be in $PATH. for more information, please refer to the following [guide](https://kubernetes.io/docs/tasks/tools/#kubectl)  
+- Compile the main.go file with `go build main.go` (optional to provide a meaningful name like allocator, thunderallocator or something similar).
+- Once you have the executable ready, you can run it to: 
+    - Provide no argument for some help and details.
+    - `list` which will provide the available servers.
+    - `allocate <build-id> <session-id> [tls-public] [tls-private]` where the tls certificates are optional, but build and session ID are mandatory. Please note that providing the certs as env variables is also supported; if so, please name them TLS_PUBLIC for the cert file and TLS_PRIVATE for the key file.

tools/allocator/go.mod

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+module github.com/playfab/thundernetes/tools/allocator
+
+go 1.16

tools/allocator/main.go

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+package main
+
+import (
+	"bytes"
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+);
+
+type AllocationResult struct {
+	IPV4Address string `json:"IPv4Address"`
+	SessionID   string `json:"SessionID"`
+};
+
+var (
+	ip string
+	certFile string
+	keyFile string
+	tlsSet bool
+	ar *AllocationResult
+);
+
+func main () {
+	args := os.Args
+
+	if len(args) == 1 {
+		fmt.Println("Usage of the allocator tool (is required to have"+
+					" kubectl on your $PATH)")
+		fmt.Println("\t- allocate <build-id> <session-id> [tls-public] [tls-private]"+
+					" # Initialize a server with the given paramaters (if tls certs"+
+					" are not on the TLS_PUBLIC / TLS_PRIVATE env variables, please"+
+					" provide them via argument)")
+		fmt.Println("\t- list # Returns the available Game Servers")
+	} else if strings.Compare(args[1], "allocate") == 0 {
+		fmt.Println("Beginning the allocate process")
+
+		cmd := exec.Command("kubectl","get","svc","-n","thundernetes-system","thundernetes-controller-manager",
+			"-o","jsonpath='{.status.loadBalancer.ingress[0].ip}'")
+
+		output, err := cmd.CombinedOutput()
+
+		if err != nil {
+			log.Println("Is required to have kubectl on your $PATH")
+			log.Fatal(string(output))
+
+		}
+
+		if len(args) < 5 { // if no more arguments are provided
+			if certFile == "" || keyFile == "" { // If the env vars are not set
+				tlsSet = false
+			} else { // the env vars are set 
+				tlsSet = true
+			}
+		} else { //  all the arguments are provided
+			tlsSet = true
+		}
+
+		if len(output) < 3 { // basically if we don't have a valid IP
+			if tlsSet == true {
+				ip = "https://127.0.0.1"
+				cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+				ar, err = allocateTls(ip, args[2], args[3], cert)
+
+				if err != nil {
+					log.Panic(err)
+				}		
+			} else {
+				ip = "http://127.0.0.1"
+				ar, err = allocateNoTls(ip, args[2], args[3])
+
+				if err != nil {
+					log.Panic(err)
+				}		
+			}
+		} else { //  if we retrieve the ip correctly
+			ip = string(output)
+
+			if tlsSet == true {
+				cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+				ar, err = allocateTls(ip, args[2], args[3], cert)
+
+				if err != nil {
+					log.Panic(err)
+				}
+			} else {
+				ar, err = allocateNoTls(ip, args[2], args[3])
+
+				if err != nil {
+					log.Panic(err)
+				}
+			}
+		}
+
+		log.Println("IP address: "+ ar.IPV4Address+". Session ID: "+ar.SessionID);
+
+	} else if strings.Compare(args[1], "list") == 0 {
+		fmt.Println("Listing the available game servers")
+		cmd := exec.Command("kubectl", "get", "gs")
+		output, err := cmd.CombinedOutput()
+
+		if err != nil {
+			fmt.Println(string(output))
+			log.Fatal("Error while fetching the servers: ", err)
+			log.Println("It is required to have kubectl on your $PATH")
+			fmt.Println("Please, make sure you have your cluster configured properly")
+		}
+
+		fmt.Println(string(output))
+	} else {
+		fmt.Println("Sorry, but the commad "+args[1]+" is not recognized")
+	}
+
+	fmt.Println("\nThanks for using the thundernetes allocator tool")
+
+}
+
+func allocateTls(ip string, buildID string, sessionID string, cert tls.Certificate) (*AllocationResult, error) {
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: true,
+		Certificates:       []tls.Certificate{cert},
+	}
+
+	transport := &http.Transport{TLSClientConfig: tlsConfig}
+	client := &http.Client{Transport: transport}
+
+	postBody, _ := json.Marshal(map[string]interface{}{
+		"buildID":        buildID,
+		"sessionID":      sessionID,
+		"sessionCookie":  "coolRandomCookie",
+		"initialPlayers": []string{"player1", "player2"},
+	})
+
+	postBodyBytes := bytes.NewBuffer(postBody)
+	resp, err := client.Post(ip+":5000/api/v1/allocate", "application/json", postBodyBytes)
+
+	//Handle Error
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%d", resp.StatusCode)
+	}
+
+	//Read the response body
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	ar := &AllocationResult{}
+	json.Unmarshal(body, ar)
+
+	if ar.IPV4Address == "" {
+		return nil, fmt.Errorf("invalid IPV4Address %s", ar.IPV4Address)
+	}
+
+	if ar.SessionID != sessionID {
+		return nil, fmt.Errorf("invalid SessionID %s", ar.SessionID)
+	}
+
+	return ar, nil
+}
+
+func allocateNoTls(ip string, buildID string, sessionID string) (*AllocationResult, error) {
+
+	transport := &http.Transport{}
+	client := &http.Client{Transport: transport}
+
+	postBody, _ := json.Marshal(map[string]interface{}{
+		"buildID":        buildID,
+		"sessionID":      sessionID,
+		"sessionCookie":  "coolRandomCookie",
+		"initialPlayers": []string{"player1", "player2"},
+	})
+
+	postBodyBytes := bytes.NewBuffer(postBody)
+	resp, err := client.Post(ip+":5000/api/v1/allocate", "application/json", postBodyBytes)
+
+	//Handle Error
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%d", resp.StatusCode)
+	}
+
+	//Read the response body
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	ar := &AllocationResult{}
+	json.Unmarshal(body, ar)
+
+	if ar.IPV4Address == "" {
+		return nil, fmt.Errorf("invalid IPV4Address %s", ar.IPV4Address)
+	}
+
+	if ar.SessionID != sessionID {
+		return nil, fmt.Errorf("invalid SessionID %s", ar.SessionID)
+	}
+
+	return ar, nil
+}