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ircd::client: Add comments; move around error handlers; related.

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This commit is contained in:
Jason Volk 2017-12-21 16:12:36 -07:00
parent 40d6b6055b
commit f8d3fee8b6
1 changed files with 47 additions and 24 deletions
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71
ircd/client.cc
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@ -243,6 +243,24 @@ namespace ircd
bool handle_request(client &client, parse::capstan &pc);
}
/// Main client loop.
///
/// This function parses requests off the socket in a loop until there are no
/// more requests or there is a fatal error. The ctx will "block" to wait for
/// more data off the socket during the middle of a request until the request
/// timeout is reached. main() will not "block" to wait for more data after a
/// request; it will simply `return true` which puts this client back into
/// async mode and relinquishes this stack. returning false will disconnect
/// the client rather than putting it back into async mode. Exceptions do not
/// pass below main() therefor anything unhandled is an internal server error
/// and the client is disconnected as well.
///
/// Before main(), the client had been sitting in async mode waiting for
/// socket activity. Once activity with data was detected indicating a request,
/// the client was dispatched to the request pool where it is paired to an
/// ircd::ctx with a stack. main() is then invoked on that ircd::ctx stack.
/// Nothing from the socket has been read into userspace before main().
///
bool
ircd::client::main()
noexcept try
@ -267,25 +285,6 @@ noexcept try
return true;
}
catch(const http::error &e)
{
log::debug("client[%s] HTTP %s in %ld$us %s",
string(remote(*this)),
e.what(),
request_timer.at<microseconds>().count(),
e.content);
switch(e.code)
{
case http::BAD_REQUEST:
case http::REQUEST_TIMEOUT:
case http::INTERNAL_SERVER_ERROR:
return false;
default:
return true;
}
}
catch(const boost::system::system_error &e)
{
using namespace boost::system::errc;
@ -295,7 +294,6 @@ catch(const boost::system::system_error &e)
const error_code &ec{e.code()};
const int &value{ec.value()};
if(ec.category() == get_system_category()) switch(value)
{
case success:
@ -360,6 +358,17 @@ catch(const std::exception &e)
#endif
}
/// Handle a single request within the client main() loop.
///
/// This function returns false if the main() loop should exit
/// and thus disconnect the client. It should return true in most
/// cases even for lightly erroneous requests that won't affect
/// the next requests on the tape.
///
/// This function is timed. The timeout will prevent a client from
/// sending a partial request and leave us waiting for the rest.
/// As of right now this timeout extends to our handling of the
/// request too.
bool
ircd::handle_request(client &client,
parse::capstan &pc)
@ -391,21 +400,35 @@ try
}
catch(const http::error &e)
{
log::error("client[%s]: %s",
log::debug("client[%s] HTTP %s in %ld$us %s",
string(remote(client)),
e.what());
e.what(),
client.request_timer.at<microseconds>().count(),
e.content);
http::response
{
e.code, e.content, write_closure(client)
};
throw;
switch(e.code)
{
case http::BAD_REQUEST:
case http::REQUEST_TIMEOUT:
return false;
case http::INTERNAL_SERVER_ERROR:
throw;
default:
return true;
}
}
catch(const std::exception &e)
{
log::error("client[%s]: %s",
log::error("client[%s]: in %ld$us: %s",
string(remote(client)),
client.request_timer.at<microseconds>().count(),
e.what());
http::response