chore: add gc config

crates/loro-core/src/change.rs

@@ -52,8 +52,17 @@ impl HasLength for Change {
 }
 
 pub struct ChangeMergeCfg {
-    max_change_length: usize,
-    max_change_interval: usize,
+    pub max_change_length: usize,
+    pub max_change_interval: usize,
+}
+
+impl Default for ChangeMergeCfg {
+    fn default() -> Self {
+        ChangeMergeCfg {
+            max_change_length: 1024,
+            max_change_interval: 60,
+        }
+    }
 }
 
 impl Mergable<ChangeMergeCfg> for Change {

crates/loro-core/src/log_store.rs

@@ -3,17 +3,42 @@ use std::collections::HashMap;
 use string_cache::{Atom, DefaultAtom, EmptyStaticAtomSet};
 
 use crate::{change::Change, id::ClientID, ChangeMergeCfg, Lamport, ID};
+const YEAR: u64 = 365 * 24 * 60 * 60;
+const MONTH: u64 = 30 * 24 * 60 * 60;
+
+pub struct GcConfig {
+    pub gc: bool,
+    pub interval: u64,
+}
+
+impl Default for GcConfig {
+    fn default() -> Self {
+        GcConfig {
+            gc: false,
+            interval: 6 * MONTH,
+        }
+    }
+}
+
+pub struct Configure {
+    pub change: ChangeMergeCfg,
+    pub gc: GcConfig,
+}
 
 pub struct LogStore {
     ops: HashMap<ClientID, RleVec<Change, ChangeMergeCfg>>,
-    lamport: Lamport,
+    cfg: Configure,
+    latest_lamport: Lamport,
+    latest_timestamp: Lamport,
 }
 
 impl LogStore {
-    pub fn new() -> Self {
+    pub fn new(cfg: Configure) -> Self {
         Self {
+            cfg,
             ops: HashMap::new(),
-            lamport: 0,
+            latest_lamport: 0,
+            latest_timestamp: 0,
         }
     }
 
@@ -26,6 +51,9 @@ impl LogStore {
 
 impl Default for LogStore {
     fn default() -> Self {
-        Self::new()
+        Self::new(Configure {
+            change: Default::default(),
+            gc: Default::default(),
+        })
     }
 }

crates/loro-framework/src/raw_store.rs

@@ -81,6 +81,10 @@ impl RawStore {
 
         version_vector
     }
+
+    pub fn sign(&self, pub_key: ()) {
+        unimplemented!()
+    }
 }
 
 impl Default for RawStore {