Cpu resources (#642)

* fn: cpu quota implementation

api/models/config_test.go

@@ -0,0 +1,112 @@
+package models
+
+import (
+	"encoding/json"
+	"fmt"
+	"testing"
+)
+
+func checkStr(input string, expected MilliCPUs) error {
+	var res MilliCPUs
+	err := json.Unmarshal([]byte(input), &res)
+	if err != nil {
+		return err
+	}
+	if expected != res {
+		return fmt.Errorf("mismatch %s != %s", res, expected)
+	}
+	return nil
+}
+
+func checkErr(input string) (MilliCPUs, error) {
+	var res MilliCPUs
+	err := json.Unmarshal([]byte(input), &res)
+	if err != nil {
+		return res, err
+	}
+	return res, nil
+}
+
+func TestMilliCPUsUnmarshal(t *testing.T) {
+
+	err := checkStr("\"1.00\"", 1000)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"1\"", 1000)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"0\"", 0)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"00000\"", 0)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"+00000\"", 0)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"-00000\"", 0)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"0.01\"", 10)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	tmp, err := checkErr("\"1000000000000000000000000\"")
+	if err == nil {
+		t.Fatal("failed, should get error, got: ", tmp)
+	}
+
+	// 0.2341 is too high of a precision for CPUs
+	err = checkStr("\"0.2341\"", 234)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"1m\"", 1)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"1000m\"", 1000)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	tmp, err = checkErr("\"-100\"")
+	if err == nil {
+		t.Fatal("failed, should get error, got: ", tmp)
+	}
+
+	tmp, err = checkErr("\"100000000000m\"")
+	if err == nil {
+		t.Fatal("failed, should get error, got: ", tmp)
+	}
+
+	err = checkStr("\".2\"", 200)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	err = checkStr("\"100.2000\"", 100200)
+	if err != nil {
+		t.Fatal("failed: ", err)
+	}
+
+	tmp, err = checkErr("\"-0.20\"")
+	if err == nil {
+		t.Fatal("failed, should get error got: ", tmp)
+	}
+}