From f66b89b493fd282d4170617f85c29c47fca75cf4 Mon Sep 17 00:00:00 2001
From: Szczepan Zalega <szczepan.zalega@gmail.com>
Date: Sun, 6 Mar 2016 19:51:16 +0100
Subject: Checking device status after completion of get_feature report and
 retrying receiving if device status!=0, added FIXME notes of further work

---
 device.cc              | 32 +++++++++++++++++++++++++-------
 include/device.h       |  5 +++++
 include/device_proto.h | 14 +++++++++++++-
 3 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/device.cc b/device.cc
index f957223..fc8f6b8 100644
--- a/device.cc
+++ b/device.cc
@@ -44,24 +44,42 @@ CommError Device::send(const void *packet) {
 }
 
 CommError Device::recv(void *packet) {
-  CommError status;
+  // FIXME change CommError return value to int (return value of
+  // hid_get_feature_report)
+  int status;
   int retry_count = 0;
 
   Log::instance()(__PRETTY_FUNCTION__, Loglevel::DEBUG_L2);
-  std::this_thread::sleep_for(std::chrono::milliseconds(
-      5000));  // FIXME remove timeout in favor of sync communication
 
   if (mp_devhandle == NULL)
     throw std::runtime_error("Attempted HID receive on an invalid descriptor.");
 
+  // FIXME extract error handling and repeating to parent function in
+  // device_proto:192
   for (;;) {
-    status = (CommError)(hid_get_feature_report(
-        mp_devhandle, (unsigned char *)(packet), HID_REPORT_SIZE));
-    if ((int)status > 0 || retry_count++ >= m_retry_count) break;
+    status = (hid_get_feature_report(mp_devhandle, (unsigned char *)(packet),
+                                     HID_REPORT_SIZE));
+
+    // FIXME handle getting libhid error message somewhere else
+    auto pwherr = hid_error(mp_devhandle);
+    std::wstring wherr = (pwherr != NULL) ? pwherr : L"No error message";
+    std::string herr(wherr.begin(), wherr.end());
+    Log::instance()(std::string("libhid error message: ") + herr,
+                    Loglevel::DEBUG_L2);
+
+    if (status > 0) break;  // success
+    if (retry_count++ >= m_retry_count) {
+      Log::instance()(
+          "Maximum retry count reached" + std::to_string(retry_count),
+          Loglevel::WARNING);
+      break;
+    }
+    Log::instance()("Retrying... " + std::to_string(retry_count),
+                    Loglevel::DEBUG);
     std::this_thread::sleep_for(m_retry_timeout);
   }
 
-  return status;
+  return (CommError)status;
 }
 
 Stick10::Stick10() {
diff --git a/include/device.h b/include/device.h
index 768ac32..dc7832d 100644
--- a/include/device.h
+++ b/include/device.h
@@ -39,6 +39,11 @@ class Device {
    */
   virtual CommError recv(void *packet);
 
+  int get_retry_count() { return m_retry_count; }
+  const;
+  std::chrono::milliseconds get_retry_timeout() { return m_retry_timeout; }
+  const;
+
  protected:
   uint16_t m_vid;
   uint16_t m_pid;
diff --git a/include/device_proto.h b/include/device_proto.h
index 142b45b..f2ed84d 100644
--- a/include/device_proto.h
+++ b/include/device_proto.h
@@ -1,6 +1,7 @@
 #ifndef DEVICE_PROTO_H
 #define DEVICE_PROTO_H
 #include <utility>
+#include <thread>
 #include <type_traits>
 #include <stdexcept>
 #include <string>
@@ -179,7 +180,18 @@ class Transaction : semantics::non_constructible {
           std::string("Device error while sending command ") +
           std::to_string((int)(status)));
 
-    status = dev.recv(&resp);
+    // FIXME make checks done in device:recv here
+    int retry = dev.get_retry_count();
+    while (retry-- > 0) {
+      status = dev.recv(&resp);
+      if (resp.device_status == 0) break;
+      Log::instance()("Device status is not ready (CRC error?) retrying..",
+                      Loglevel::DEBUG);  // FIXME translate device_status to log
+      Log::instance()("Invalid incoming HID packet:", Loglevel::DEBUG_L2);
+      Log::instance()((std::string)(resp), Loglevel::DEBUG_L2);
+      std::this_thread::sleep_for(dev.get_retry_timeout());
+      continue;
+    }
     if ((int)(status) < 0 && status != CommError::ERR_NO_ERROR)
       throw std::runtime_error(
           std::string("Device error while executing command ") +
-- 
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