Add Dryad configuration package

A non-standard library for configuration serialization is used.
It is licensed under MIT license. Install it with command below:
    go get "github.com/BurntSushi/toml"

Change-Id: I71321d341ac8d64c6a9ed85f2d895524eca01fac
Signed-off-by: Aleksander Mistewicz <a.mistewicz@samsung.com>

3 files changed, 172 insertions, 0 deletions

diff --git a/dryad/conf/conf.go b/dryad/conf/conf.go
new file mode 100644
index 0000000..f2bf265
--- /dev/null
+++ b/dryad/conf/conf.go
@@ -0,0 +1,75 @@
+/*
+ *  Copyright (c) 2017-2018 Samsung Electronics Co., Ltd 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 conf manages Dryad's configuration.
+package conf
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+
+	"github.com/BurntSushi/toml"
+)
+
+// DefaultRPCPort is a port that should be used as default parameter
+// for Dryad's RPC client and server.
+const DefaultRPCPort = 7175
+
+// NewConf returns a new instance of General configuration with default values set.
+func NewConf() *General {
+	return &General{
+		Address: fmt.Sprintf(":%d", DefaultRPCPort),
+		User: &User{
+			Name:   "boruta-user",
+			Groups: []string{},
+		},
+		SDcard: "/dev/sdX",
+	}
+}
+
+// User is a section in a configuration used for user manipulation.
+type User struct {
+	// Name is a username of a local account. It should be used to establish SSH session
+	// to the system Dryad is running on.
+	Name string `toml:"name"`
+	// Groups is a list of local Unix groups the username belongs to.
+	Groups []string `toml:"groups"`
+}
+
+// General is a base struct of configuration.
+type General struct {
+	// Address is used to listen for connection from Boruta.
+	Address string `toml:"listen_address"`
+	// User refers information necessary to create the user.
+	User *User `toml:"user"`
+	// SDcard is a base path to block device of sdcard.
+	SDcard string `toml:"sdcard"`
+}
+
+// Marshal writes TOML representation of g to w.
+func (g *General) Marshal(w io.Writer) error {
+	return toml.NewEncoder(w).Encode(g)
+}
+
+// Unmarshal reads TOML representation from r and parses it into g.
+func (g *General) Unmarshal(r io.Reader) error {
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return err
+	}
+	return toml.Unmarshal(b, g)
+}
diff --git a/dryad/conf/conf_suite_test.go b/dryad/conf/conf_suite_test.go
new file mode 100644
index 0000000..cb1aa15
--- /dev/null
+++ b/dryad/conf/conf_suite_test.go
@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2017-2018 Samsung Electronics Co., Ltd 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 conf_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestConf(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Conf Suite")
+}
diff --git a/dryad/conf/conf_test.go b/dryad/conf/conf_test.go
new file mode 100644
index 0000000..9a2d369
--- /dev/null
+++ b/dryad/conf/conf_test.go
@@ -0,0 +1,68 @@
+/*
+ *  Copyright (c) 2017-2018 Samsung Electronics Co., Ltd 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 conf_test
+
+import (
+	"bytes"
+	"strings"
+
+	. "git.tizen.org/tools/boruta/dryad/conf"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Conf", func() {
+	marshaled := `listen_address = ":7175"
+sdcard = "/dev/sdX"
+
+[user]
+  name = "boruta-user"
+  groups = []
+`
+	unmarshaled := &General{
+		Address: ":7175",
+		User: &User{
+			Name:   "boruta-user",
+			Groups: []string{},
+		},
+		SDcard: "/dev/sdX",
+	}
+	var g *General
+
+	BeforeEach(func() {
+		g = NewConf()
+	})
+
+	It("should initially have default configuration", func() {
+		Expect(g).To(Equal(unmarshaled))
+	})
+
+	It("should encode default configuration", func() {
+		var w bytes.Buffer
+		g.Marshal(&w)
+		result := w.String()
+		Expect(result).ToNot(BeEmpty())
+		Expect(result).To(Equal(marshaled))
+	})
+
+	It("should decode default configuration", func() {
+		g = new(General)
+		g.Unmarshal(strings.NewReader(marshaled))
+		Expect(g).To(Equal(unmarshaled))
+	})
+})