Continue work on database module

database/interface.go

@@ -1,27 +1,69 @@
 package database
 
+import (
+	"github.com/Safing/portbase/database/record"
+)
+
 // Interface provides a method to access the database with attached options.
-type Interface struct {}
+type Interface struct {
+	options *Options
+}
 
 // Options holds options that may be set for an Interface instance.
 type Options struct {
-  Local bool
-  Internal bool
-  AlwaysMakeSecret bool
-  AlwaysMakeCrownjewel bool
+	Local                bool
+	Internal             bool
+	AlwaysMakeSecret     bool
+	AlwaysMakeCrownjewel bool
 }
 
 // NewInterface returns a new Interface to the database.
 func NewInterface(opts *Options) *Interface {
-  return &Interface{
-    local: local,
-    internal: internal,
-  }
+	if opts == nil {
+		opts = &Options{}
+	}
+
+	return &Interface{
+		options: opts,
+	}
 }
 
+// Exists return whether a record with the given key exists.
+func (i *Interface) Exists(key string) (bool, error) {
+	_, err := i.getRecord(key)
+	if err != nil {
+		if err == ErrNotFound {
+			return false, nil
+		}
+		return false, err
+	}
+	return true, nil
+}
+
+// Get return the record with the given key.
 func (i *Interface) Get(key string) (record.Record, error) {
+	r, err := i.getRecord(key)
+	if err != nil {
+		return nil, err
+	}
 
-  controller
+	if !r.Meta().CheckPermission(i.options.Local, i.options.Internal) {
+		return nil, ErrPermissionDenied
+	}
 
-  return nil, nil
+	return r, nil
+}
+
+func (i *Interface) getRecord(key string) (record.Record, error) {
+	dbKey, db, err := splitKeyAndGetDatabase(key)
+	if err != nil {
+		return nil, err
+	}
+
+	r, err := db.Get(dbKey)
+	if err != nil {
+		return nil, err
+	}
+
+	return r, nil
 }