wallet2: call is_key_image_spent in blocks in rescan_spent

This is a potentially long lasting daemon RPC call

1 files changed, 24 insertions, 21 deletions

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 379159709..dff848a92 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -2639,28 +2639,31 @@ void wallet2::get_unconfirmed_payments(std::list<std::pair<crypto::hash,wallet2:
 //----------------------------------------------------------------------------------------------------
 void wallet2::rescan_spent()
 {
-  std::vector<std::string> key_images;
-
-  // make a list of key images for all our outputs
-  for (size_t i = 0; i < m_transfers.size(); ++i)
-  {
-    const transfer_details& td = m_transfers[i];
-    key_images.push_back(string_tools::pod_to_hex(td.m_key_image));
+  // This is RPC call that can take a long time if there are many outputs,
+  // so we call it several times, in stripes, so we don't time out spuriously
+  std::vector<int> spent_status;
+  spent_status.reserve(m_transfers.size());
+  const size_t chunk_size = 1000;
+  for (size_t start_offset = 0; start_offset < m_transfers.size(); start_offset += chunk_size)
+  {
+    const size_t n_outputs = std::min<size_t>(chunk_size, m_transfers.size() - start_offset);
+    MDEBUG("Calling is_key_image_spent on " << start_offset << " - " << (start_offset + n_outputs - 1) << ", out of " << m_transfers.size());
+    COMMAND_RPC_IS_KEY_IMAGE_SPENT::request req = AUTO_VAL_INIT(req);
+    COMMAND_RPC_IS_KEY_IMAGE_SPENT::response daemon_resp = AUTO_VAL_INIT(daemon_resp);
+    for (size_t n = start_offset; n < start_offset + n_outputs; ++n)
+      req.key_images.push_back(string_tools::pod_to_hex(m_transfers[n].m_key_image));
+    m_daemon_rpc_mutex.lock();
+    bool r = epee::net_utils::invoke_http_json("/is_key_image_spent", req, daemon_resp, m_http_client, rpc_timeout);
+    m_daemon_rpc_mutex.unlock();
+    THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "is_key_image_spent");
+    THROW_WALLET_EXCEPTION_IF(daemon_resp.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "is_key_image_spent");
+    THROW_WALLET_EXCEPTION_IF(daemon_resp.status != CORE_RPC_STATUS_OK, error::is_key_image_spent_error, daemon_resp.status);
+    THROW_WALLET_EXCEPTION_IF(daemon_resp.spent_status.size() != n_outputs, error::wallet_internal_error,
+      "daemon returned wrong response for is_key_image_spent, wrong amounts count = " +
+      std::to_string(daemon_resp.spent_status.size()) + ", expected " +  std::to_string(n_outputs));
+    std::copy(daemon_resp.spent_status.begin(), daemon_resp.spent_status.end(), std::back_inserter(spent_status));
   }
 
-  COMMAND_RPC_IS_KEY_IMAGE_SPENT::request req = AUTO_VAL_INIT(req);
-  COMMAND_RPC_IS_KEY_IMAGE_SPENT::response daemon_resp = AUTO_VAL_INIT(daemon_resp);
-  req.key_images = key_images;
-  m_daemon_rpc_mutex.lock();
-  bool r = epee::net_utils::invoke_http_json("/is_key_image_spent", req, daemon_resp, m_http_client, rpc_timeout);
-  m_daemon_rpc_mutex.unlock();
-  THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "is_key_image_spent");
-  THROW_WALLET_EXCEPTION_IF(daemon_resp.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "is_key_image_spent");
-  THROW_WALLET_EXCEPTION_IF(daemon_resp.status != CORE_RPC_STATUS_OK, error::is_key_image_spent_error, daemon_resp.status);
-  THROW_WALLET_EXCEPTION_IF(daemon_resp.spent_status.size() != key_images.size(), error::wallet_internal_error,
-    "daemon returned wrong response for is_key_image_spent, wrong amounts count = " +
-    std::to_string(daemon_resp.spent_status.size()) + ", expected " +  std::to_string(key_images.size()));
-
   // update spent status
   for (size_t i = 0; i < m_transfers.size(); ++i)
   {
@@ -2668,7 +2671,7 @@ void wallet2::rescan_spent()
     // a view wallet may not know about key images
     if (!td.m_key_image_known)
       continue;
-    if (td.m_spent != (daemon_resp.spent_status[i] != COMMAND_RPC_IS_KEY_IMAGE_SPENT::UNSPENT))
+    if (td.m_spent != (spent_status[i] != COMMAND_RPC_IS_KEY_IMAGE_SPENT::UNSPENT))
     {
       if (td.m_spent)
       {