Implement key-generation demo experiment

demo/config.yaml

@@ -1,11 +1,15 @@
-application:
+statestore:
   components:        
     app:
+      cost_formula: "1"
       settings:
-        key_size:
+        mem:          
           type: enum
-          unit: bits
+          unit: mb
           value: 1024
+        key_size:          
+          type: enum
+          unit: bits
           values:
             - 1024
             - 2048

demo/docker-compose.yaml

@@ -33,6 +33,5 @@ services:
     restart: always
     volumes:
       - ./config.yaml:/servo/config.yaml
-      - ./config.yaml:/servo/measure.d/config.yaml
       - ./opsani.token:/run/secrets/opsani.token
     command: --auth-token /run/secrets/opsani.token --account ${OPTUNE_ACCOUNT:?The Opsani Account Name must be configured.} ${OPTUNE_APP_ID:?The Opsani App ID must be configured.}

demo/main.go

@@ -1,6 +1,12 @@
 package main
 
 import (
+	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/asn1"
+	"encoding/pem"
 	"log"
 	"strconv"
 	"time"
@@ -15,6 +21,8 @@ import (
 const metricsPath string = "/metrics"
 const subsystemName string = "demo"
 
+var keySizeInBits int = 1024
+
 // Metrics maintains the values to be emitted to Prometheus
 type Metrics struct {
 	requestCount     *prometheus.CounterVec
@@ -89,10 +97,43 @@ func main() {
 	})
 
 	app.Get("/", func(c *fiber.Ctx) {
+		// Generate RSA keys to make this interesting
+		reader := rand.Reader
+		key, _ := rsa.GenerateKey(reader, keySizeInBits)
+
+		var privateKey = &pem.Block{
+			Type:  "PRIVATE KEY",
+			Bytes: x509.MarshalPKCS1PrivateKey(key),
+		}
+		privateKeyPem := new(bytes.Buffer)
+		_ = pem.Encode(privateKeyPem, privateKey)
+
+		asn1Bytes, _ := asn1.Marshal(key.PublicKey)
+		var pemkey = &pem.Block{
+			Type:  "PUBLIC KEY",
+			Bytes: asn1Bytes,
+		}
+		publicKeyPem := new(bytes.Buffer)
+		_ = pem.Encode(publicKeyPem, pemkey)
+
 		c.JSON(fiber.Map{
-			"hello": "world",
+			"private_key": privateKeyPem.String(),
+			"public_key":  publicKeyPem.String(),
 		})
 	})
 
+	app.Put("/set/:size", func(c *fiber.Ctx) {
+		size := c.Params("size")
+		i, err := strconv.Atoi(size)
+		if err == nil {
+			keySizeInBits = i
+		}
+		c.SendStatus(200)
+		c.JSON(fiber.Map{
+			"size": keySizeInBits,
+		})
+		log.Println(string(c.Path()))
+	})
+
 	app.Listen(8080)
 }