From 03890a8b501475240b343664bdfc3bacebae1cbe Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Wed, 2 Aug 2017 08:04:28 +0200
Subject: Add config

---
 config/config.go          | 84 +++++++++++++++++++++++++++++++++++++++++++++++
 storage/memory_storage.go |  9 +++++
 storage/storage.go        |  9 +++++
 3 files changed, 102 insertions(+)
 create mode 100644 config/config.go

diff --git a/config/config.go b/config/config.go
new file mode 100644
index 0000000..e925be3
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,84 @@
+package config
+
+import (
+	"fmt"
+	"github.com/BurntSushi/toml"
+	"github.com/adrg/xdg"
+	"os"
+	"os/user"
+	"reflect"
+	"strings"
+)
+
+type StorageConfig map[string]interface{}
+
+type Config struct {
+	DefaultStorage string `toml:"default_storage"`
+	Signing        struct {
+		Key string
+	}
+	Storage map[string]StorageConfig
+}
+
+func LoadConfig(path string) (config Config, err error) {
+	if path == "" {
+		path, err = xdg.ConfigFile("petrific/config.toml")
+		if err != nil {
+			return
+		}
+	}
+
+	_, err = toml.DecodeFile(path, &config)
+	return
+}
+
+// Get gets a value from the StorageConfig, taking care about type checking.
+// ptr must be a pointer or this method will panic.
+// ptr will only be changed, if returned error != nil
+func (s StorageConfig) Get(k string, ptr interface{}) error {
+	ptrval := reflect.ValueOf(ptr)
+
+	if ptrval.Kind() != reflect.Ptr {
+		panic("ptr must be a pointer")
+	}
+
+	ptrelem := ptrval.Elem()
+	if !ptrelem.CanSet() {
+		panic("*ptr not settable?!")
+	}
+
+	v, ok := s[k]
+	if !ok {
+		return fmt.Errorf("Key '%s' is missing", k)
+	}
+
+	vval := reflect.ValueOf(v)
+
+	if vval.Type() != ptrelem.Type() {
+		return fmt.Errorf("Expected config '%s' to be of type %s, got %s", k, ptrelem.Type(), vval.Type())
+	}
+
+	ptrelem.Set(vval)
+	return nil
+}
+
+func ExpandTilde(path string) string {
+	home, ok := os.LookupEnv("HOME")
+	if !ok {
+		u, err := user.Current()
+		if err != nil {
+			return path
+		}
+		home = u.HomeDir
+	}
+
+	if home == "" {
+		return path
+	}
+
+	parts := strings.Split(path, string(os.PathSeparator))
+	if len(parts) > 0 && parts[0] == "~" {
+		parts[0] = home
+	}
+	return strings.Join(parts, string(os.PathSeparator))
+}
diff --git a/storage/memory_storage.go b/storage/memory_storage.go
index 0c90981..b9ed54a 100644
--- a/storage/memory_storage.go
+++ b/storage/memory_storage.go
@@ -1,6 +1,7 @@
 package storage
 
 import (
+	"code.laria.me/petrific/config"
 	"code.laria.me/petrific/objects"
 )
 
@@ -16,6 +17,10 @@ func NewMemoryStorage() Storage {
 	}
 }
 
+func MemoryStorageFromConfig(conf config.Config, name string) (Storage, error) {
+	return NewMemoryStorage(), nil
+}
+
 func (ms MemoryStorage) Get(id objects.ObjectId) ([]byte, error) {
 	b, ok := ms.objects[id.String()]
 	if !ok {
@@ -39,3 +44,7 @@ func (ms MemoryStorage) Set(id objects.ObjectId, typ objects.ObjectType, raw []b
 func (ms MemoryStorage) List(typ objects.ObjectType) ([]objects.ObjectId, error) {
 	return ms.bytype[typ], nil
 }
+
+func (MemoryStorage) Close() error {
+	return nil
+}
diff --git a/storage/storage.go b/storage/storage.go
index 45b1973..0729fe1 100644
--- a/storage/storage.go
+++ b/storage/storage.go
@@ -2,6 +2,7 @@ package storage
 
 import (
 	"bytes"
+	"code.laria.me/petrific/config"
 	"code.laria.me/petrific/objects"
 	"errors"
 	"fmt"
@@ -17,6 +18,14 @@ type Storage interface {
 	Has(id objects.ObjectId) (bool, error)
 	Set(id objects.ObjectId, typ objects.ObjectType, raw []byte) error
 	List(typ objects.ObjectType) ([]objects.ObjectId, error)
+
+	Close() error
+}
+
+type CreateStorageFromConfig func(conf config.Config, name string) (Storage, error)
+
+var StorageTypes = map[string]CreateStorageFromConfig{
+	"memory": MemoryStorageFromConfig,
 }
 
 func SetObject(s Storage, o objects.RawObject) (id objects.ObjectId, err error) {
-- 
cgit v1.2.3-54-g00ecf