Start implementing a cas in separate crates.

cas-core/src/cas.rs

@@ -0,0 +1,40 @@
+// This file is part of bsv.
+//
+// bsv is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// cdb is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for
+// more details.
+//
+// You should have received a copy of the Affero GNU General Public License
+// along with cdb.  If not, see <https://www.gnu.org/licenses/>.
+
+
+use super::error::Result;
+use super::object_id::ObjectId;
+use super::object_type::ObjectType;
+use super::object_metadata::ObjectMetadata;
+
+
+// pub struct ObjectIdIterator;
+
+
+pub trait Cas {
+    fn object_id_from_string(&self, hex: &str) -> Result<ObjectId>;
+    fn object_id_from_partial(&self, hex: &str) -> Result<ObjectId>;
+
+    fn has_object_id(&self, oid: &ObjectId) -> Result<bool>;
+    // fn iter_object_id(&self) -> Result<ObjectIdIterator>;
+
+    fn read_object(&self, oid: &ObjectId) -> Result<(ObjectMetadata, &dyn std::io::Read)>;
+    fn write_object(&mut self, otype: ObjectType, data: &mut dyn std::io::Read) -> Result<ObjectId>;
+    fn remove_object(&mut self, oid: &ObjectId) -> Result<()>;
+
+    fn read_ref(&self, key: &str) -> Result<ObjectId>;
+    fn write_ref(&mut self, key: &str, value: &ObjectId) -> Result<()>;
+    fn remove_ref(&mut self, key: &str) -> Result<()>;
+}