PutLogEvents not showing in console

[jimmyt857]

I am calling PutLogEvents, and the log shows a successful request with status 200. However, the log events are not showing up in my aws console. I am making the call as follows:

Aws::Vector<Aws::CloudWatchLogs::Model::InputLogEvent> logEvents;
std::string message = "something";
auto logEvent = Aws::CloudWatchLogs::Model::InputLogEvent()
.WithMessage(message.c_str())
.WithTimestamp(time(nullptr));
logEvents.push_back(logEvent);

Aws::CloudWatchLogs::CloudWatchLogsClient cwlClient(localCredentials, clientConfig);
auto request = Aws::CloudWatchLogs::Model::PutLogEventsRequest()
.WithLogGroupName(logGroupName.c_str())
.WithLogStreamName(logStreamName.c_str())
.WithLogEvents(logEvents);
if (sequenceToken != "")
      request.SetSequenceToken(sequenceToken);

auto outcome = cwlClient.PutLogEvents(request);
logEvents.clear();

[JonathanHenson]

.WithTimestamp(time(nullptr));

you could just use DateTime::Now()

Could you show me your log output?

[jimmyt857]

If I use DateTime::Now(), I get no known conversion for argument 1 from ‘Aws::Utils::DateTime’ to ‘long long int’, so I'm using DateTime::CurrentTimeMillis() instead.

Turns out the problem was me, the CloudWatchLogs console filter was set after the logs and I wasn't seeing them because of that. I switched to the async version of PutLogEvents and now I am getting a segfault with the following stack trace:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffee7bd700 (LWP 18853)]
0x00007ffff5b6f4a3 in std::basic_string<char, std::char_traits, std::allocator >::basic_string(std::string const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) bt
#0 0x00007ffff5b6f4a3 in std::basic_string<char, std::char_traits, std::allocator >::basic_string(std::string const&) ()
from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#1 0x0000000001b23787 in Aws::Http::Standard::StandardHttpRequest::StandardHttpRequest(Aws::Http::URI const&, Aws::Http::HttpMethod) ()
#2 0x0000000001b22949 in Aws::Http::DefaultHttpClientFactory::CreateHttpRequest(Aws::Http::URI const&, Aws::Http::HttpMethod, std::function<std::iostream* ()> const&) const ()
#3 0x00000000019b77fa in Aws::CloudWatchLogs::CloudWatchLogsClient::PutLogEventsAsyncHelper(Aws::CloudWatchLogs::Model::PutLogEventsRequest const&, std::function<void (Aws::CloudWatchLogs::CloudWatchLogsClient const*, Aws::CloudWatchLogs::Model::PutLogEventsRequest const&, Aws::Utils::Outcome<Aws::CloudWatchLogs::Model::PutLogEventsResult, Aws::Client::AWSErrorAws::CloudWatchLogs::CloudWatchLogsErrors > const&, std::shared_ptr<Aws::Client::AsyncCallerContext const> const&)> const&, std::shared_ptr<Aws::Client::AsyncCallerContext const> const&) const ()
#4 0x00007ffff5b65a60 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5 0x00007ffff724f182 in start_thread (arg=0x7fffee7bd700) at pthread_create.c:312
#6 0x00007ffff52cd47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

[JonathanHenson]

It looks like segfaults are a common theme for you. Any chance you could send me your code so I can have a look at how everything is configured?

[jimmyt857]

I decided to write a minimal example, and it actually works. Running that same minimal example from my project fails, however, so it is certainly a problem with my setup. My minimal example is passing only constant values to the PutLogEvents request, so this feels like some sort of memory issue to me. However, valgrind reports tons of errors (such as the one below) even in my working example so it is hard to separate what is different. Is there a way to run this library in a valgrind-clean way?

==30342== Conditional jump or move depends on uninitialised value(s)
==30342== at 0x4CD46E: Aws::External::Json::Reader::getNextChar() (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4CD54F: Aws::External::Json::Reader::readString() (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4CFEAE: Aws::External::Json::Reader::readToken(Aws::External::Json::Reader::Token&) (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4D8C62: Aws::External::Json::Reader::readObject(Aws::External::Json::Reader::Token&) (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4D91FA: Aws::External::Json::Reader::readValue() (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4D992C: Aws::External::Json::Reader::parse(char const_, char const_, Aws::External::Json::Value&, bool) (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4D9C29: Aws::External::Json::Reader::parse(std::istream&, Aws::External::Json::Value&, bool) (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4B2E20: Aws::Utils::Json::JsonValue::JsonValue(std::istream&) (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x4A34FF: Aws::Client::AWSJsonClient::MakeRequest(std::string const&, Aws::AmazonWebServiceRequest const&, Aws::Http::HttpMethod) const (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x46AF10: Aws::CloudWatchLogs::CloudWatchLogsClient::PutLogEvents(Aws::CloudWatchLogs::Model::PutLogEventsRequest const&) const (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x467C5E: Aws::CloudWatchLogs::CloudWatchLogsClient::PutLogEventsAsyncHelper(Aws::CloudWatchLogs::Model::PutLogEventsRequest const&, std::function<void (Aws::CloudWatchLogs::CloudWatchLogsClient const*, Aws::CloudWatchLogs::Model::PutLogEventsRequest const&, Aws::Utils::Outcome<Aws::CloudWatchLogs::Model::PutLogEventsResult, Aws::Client::AWSErrorAws::CloudWatchLogs::CloudWatchLogsErrors > const&, std::shared_ptr<Aws::Client::AsyncCallerContext const> const&)> const&, std::shared_ptr<Aws::Client::AsyncCallerContext const> const&) const (in /home/ubuntu/colossi-servers/cpp/test/Test.exe)
==30342== by 0x572834F: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22)
==30342== Uninitialised value was created by a stack allocation
==30342== at 0x4EBAE77: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)

[jimmyt857]

I finally figured it out. There is no bug, I was just writing my async functions incorrectly.

In my code I have helper functions for all of my aws calls, The helper function creates its own client object and then uses that to perform the request. For the async calls, the client object goes out of scope because it is a local variable, so bad things happen when the callback is invoked.

Before I close this issue, I have a quick question: what is the recommended way of managing clients? I.e. should I use a separate client for each request or have a global client object for each service?

[jimmyt857]

To clarify, I often call the same request multiple times simultaneously, so my real question is whether a single client can handle this or must I instead create separate clients for each request.

[JonathanHenson]

One client per service and configuration.

The client is passed to your callbacks.

Sent from my iPhone

On Oct 14, 2016, at 9:44 PM, jimmyt857 [email protected] wrote:

I finally figured it out. There is no bug, I was just writing my async functions incorrectly.

In my code I have helper functions for all of my aws calls, The helper function creates its own client object and then uses that to perform the request. For the async calls, the client object goes out of scope because it is a local variable, so bad things happen when the callback is invoked.

Before I close this issue, I have a quick question: what is the recommended way of managing clients? I.e. should I use a separate client for each request or have a global client object for each service?

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[JonathanHenson]

Always only one client.

Sent from my iPhone

On Oct 14, 2016, at 10:04 PM, jimmyt857 [email protected] wrote:

To clarify, I often call the same request multiple times simultaneously, so my real question is whether a single client can handle this or must I instead create separate clients for each request.

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[jimmyt857]

Awesome, thanks!