In a coroutine, re-throw everything ex. std::exception (and inheritors)

not just boost::coroutines::detail::forced_unwind.

This is needed because as of Boost 1.87, boost::asio::spawn() uses Fiber, not Coroutine v1.
https://github.com/boostorg/asio/commit/df973a85ed69f021

This is safe because every actual exception shall inherit from std::exception. Except forced_unwind and its Fiber equivalent, so that `catch(const std::exception&)` doesn't catch them and only them.

lib/base/io-engine.hpp

@@ -106,14 +106,17 @@ public:
 
 				try {
 					f(yc);
-				} catch (const boost::coroutines::detail::forced_unwind &) {
-					// Required for proper stack unwinding when coroutines are destroyed.
-					// https://github.com/boostorg/coroutine/issues/39
-					throw;
 				} catch (const std::exception& ex) {
 					Log(LogCritical, "IoEngine") << "Exception in coroutine: " << DiagnosticInformation(ex);
 				} catch (...) {
+					try {
 						Log(LogCritical, "IoEngine", "Exception in coroutine!");
+					} catch (...) {
+					}
+
+					// Required for proper stack unwinding when coroutines are destroyed.
+					// https://github.com/boostorg/coroutine/issues/39
+					throw;
 				}
 			},
 			boost::coroutines::attributes(GetCoroutineStackSize()) // Set a pre-defined stack size.

lib/icingadb/redisconnection.cpp

@@ -377,8 +377,6 @@ void RedisConnection::Connect(asio::yield_context& yc)
 			}
 
 			break;
-		} catch (const boost::coroutines::detail::forced_unwind&) {
-			throw;
 		} catch (const std::exception& ex) {
 			Log(LogCritical, "IcingaDB")
 				<< "Cannot connect to " << m_Host << ":" << m_Port << ": " << ex.what();
@@ -408,17 +406,10 @@ void RedisConnection::ReadLoop(asio::yield_context& yc)
 						for (auto i (item.Amount); i; --i) {
 							ReadOne(yc);
 						}
-					} catch (const boost::coroutines::detail::forced_unwind&) {
-						throw;
 					} catch (const std::exception& ex) {
 						Log(LogCritical, "IcingaDB")
 							<< "Error during receiving the response to a query which has been fired and forgotten: " << ex.what();
 
-						continue;
-					} catch (...) {
-						Log(LogCritical, "IcingaDB")
-							<< "Error during receiving the response to a query which has been fired and forgotten";
-
 						continue;
 					}
 
@@ -432,9 +423,7 @@ void RedisConnection::ReadLoop(asio::yield_context& yc)
 
 						try {
 							reply = ReadOne(yc);
-						} catch (const boost::coroutines::detail::forced_unwind&) {
+						} catch (const std::exception&) {
-							throw;
-						} catch (...) {
 							promise.set_exception(std::current_exception());
 
 							continue;
@@ -455,9 +444,7 @@ void RedisConnection::ReadLoop(asio::yield_context& yc)
 						for (auto i (item.Amount); i; --i) {
 							try {
 								replies.emplace_back(ReadOne(yc));
-							} catch (const boost::coroutines::detail::forced_unwind&) {
+							} catch (const std::exception&) {
-								throw;
-							} catch (...) {
 								promise.set_exception(std::current_exception());
 								break;
 							}
@@ -551,19 +538,11 @@ void RedisConnection::WriteItem(boost::asio::yield_context& yc, RedisConnection:
 
 		try {
 			WriteOne(item, yc);
-		} catch (const boost::coroutines::detail::forced_unwind&) {
-			throw;
 		} catch (const std::exception& ex) {
 			Log msg (LogCritical, "IcingaDB", "Error during sending query");
 			LogQuery(item, msg);
 			msg << " which has been fired and forgotten: " << ex.what();
 
-			return;
-		} catch (...) {
-			Log msg (LogCritical, "IcingaDB", "Error during sending query");
-			LogQuery(item, msg);
-			msg << " which has been fired and forgotten";
-
 			return;
 		}
 
@@ -587,19 +566,11 @@ void RedisConnection::WriteItem(boost::asio::yield_context& yc, RedisConnection:
 				WriteOne(query, yc);
 				++i;
 			}
-		} catch (const boost::coroutines::detail::forced_unwind&) {
-			throw;
 		} catch (const std::exception& ex) {
 			Log msg (LogCritical, "IcingaDB", "Error during sending query");
 			LogQuery(item[i], msg);
 			msg << " which has been fired and forgotten: " << ex.what();
 
-			return;
-		} catch (...) {
-			Log msg (LogCritical, "IcingaDB", "Error during sending query");
-			LogQuery(item[i], msg);
-			msg << " which has been fired and forgotten";
-
 			return;
 		}
 
@@ -618,9 +589,7 @@ void RedisConnection::WriteItem(boost::asio::yield_context& yc, RedisConnection:
 
 		try {
 			WriteOne(item.first, yc);
-		} catch (const boost::coroutines::detail::forced_unwind&) {
+		} catch (const std::exception&) {
-			throw;
-		} catch (...) {
 			item.second.set_exception(std::current_exception());
 
 			return;
@@ -645,9 +614,7 @@ void RedisConnection::WriteItem(boost::asio::yield_context& yc, RedisConnection:
 			for (auto& query : item.first) {
 				WriteOne(query, yc);
 			}
-		} catch (const boost::coroutines::detail::forced_unwind&) {
+		} catch (const std::exception&) {
-			throw;
-		} catch (...) {
 			item.second.set_exception(std::current_exception());
 
 			return;

lib/icingadb/redisconnection.hpp

@@ -389,9 +389,7 @@ RedisConnection::Reply RedisConnection::ReadOne(StreamPtr& stream, boost::asio::
 
 	try {
 		return ReadRESP(*strm, yc);
-	} catch (const boost::coroutines::detail::forced_unwind&) {
+	} catch (const std::exception&) {
-		throw;
-	} catch (...) {
 		if (m_Connecting.exchange(false)) {
 			m_Connected.store(false);
 			stream = nullptr;
@@ -427,9 +425,7 @@ void RedisConnection::WriteOne(StreamPtr& stream, RedisConnection::Query& query,
 	try {
 		WriteRESP(*strm, query, yc);
 		strm->async_flush(yc);
-	} catch (const boost::coroutines::detail::forced_unwind&) {
+	} catch (const std::exception&) {
-		throw;
-	} catch (...) {
 		if (m_Connecting.exchange(false)) {
 			m_Connected.store(false);
 			stream = nullptr;