From e5edfe5ae1c947c9ffb01f980d8114b2f6136c3c Mon Sep 17 00:00:00 2001
From: yanghanbing <yanghanbing@lattebank.com>
Date: Sat, 23 Jun 2018 17:35:02 +0800
Subject: [PATCH 1/2] snapshot lotate

---
 plasma/child_chain/snapshot.py | 8 ++++++--
 plasma/config.py               | 4 +++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/plasma/child_chain/snapshot.py b/plasma/child_chain/snapshot.py
index 876c4f95..545426b1 100644
--- a/plasma/child_chain/snapshot.py
+++ b/plasma/child_chain/snapshot.py
@@ -11,7 +11,7 @@ def list_snapshots():
         dir_path = os.path.join(plasma_config["PICKLE_DIR"], dir_name)
         if os.path.isdir(dir_path):
             res.append(dir_name)
-    return res
+    return sorted(res)
 
 
 def get_max_snapshot():
@@ -39,4 +39,8 @@ def make_snapshot():
         file_path = os.path.join(plasma_config["PICKLE_DIR"], file_name)
         if os.path.isfile(file_path) and file_name.endswith(".pickle"):
             shutil.copy(file_path, os.path.join(snapshot_dir, file_name))
-    print("snapshot created")
\ No newline at end of file
+    print("snapshot created")
+    snapshots = list_snapshots()
+    if len(snapshots) > plasma_config["MAX_SNAPSHOTS"]:
+        for snapshot in snapshots[:len(snapshots) - plasma_config["MAX_SNAPSHOTS"]]:
+            shutil.rmtree(os.path.join(plasma_config["PICKLE_DIR"], snapshot), ignore_errors=True)
\ No newline at end of file
diff --git a/plasma/config.py b/plasma/config.py
index d3c2191d..1c30f463 100644
--- a/plasma/config.py
+++ b/plasma/config.py
@@ -13,6 +13,7 @@
         ROOT_CHAIN_CONTRACT_ADDRESS="0xa3b2a1804203b75b494028966c0f62e677447a39",
         NETWORK="http://localhost:8545",
         BLOCK_AUTO_SUMBITTER_INTERVAL=1,
+        MAX_SNAPSHOTS=100,
         MIN_SNAPSHOT_SECONDS=10, # set 0 will not make snapshot
     )
 else:
@@ -20,7 +21,8 @@
         ROOT_CHAIN_CONTRACT_ADDRESS="0xC47e711ac6A3D16Db0826c404d8C5d8bDC01d7b1",
         NETWORK="http://localhost:8545",
         BLOCK_AUTO_SUMBITTER_INTERVAL=30,
-        MIN_SNAPSHOT_SECONDS=0, # set 0 will not make snapshot
+        MAX_SNAPSHOTS=50,
+        MIN_SNAPSHOT_SECONDS=3600, # set 0 will not make snapshot
     )
 
 plasma_config["PICKLE_DIR"] = "child_chain_pickle"

From 66e4cb0c2bb7f7e387840a0d3db7d8096a93156d Mon Sep 17 00:00:00 2001
From: yanghanbing <yanghanbing@lattebank.com>
Date: Sat, 23 Jun 2018 17:39:38 +0800
Subject: [PATCH 2/2] remove unused code

---
 plasma_tools/chain_inspect.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plasma_tools/chain_inspect.py b/plasma_tools/chain_inspect.py
index 4d0e7a51..68494be3 100644
--- a/plasma_tools/chain_inspect.py
+++ b/plasma_tools/chain_inspect.py
@@ -19,7 +19,7 @@
 from plasma.child_chain.snapshot import list_snapshots
 
 
-list_timestamp = lambda: sorted(list_snapshots())
+list_timestamp = list_snapshots
 
 
 class ChildChainSnapshot(object):