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mixer/MixerInternal: remember error details 

If a mixer is not open, rethrow the original exception each time
setting the volume is requested.  This further improves error messages
sent to MPD clients.
This commit is contained in:
Max Kellermann 2022-07-08 11:10:14 +02:00
parent 47680f936b
commit ecee6f415b
2 changed files with 17 additions and 25 deletions
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28
src/mixer/MixerControl.cxx
View File

@ -60,9 +60,9 @@ mixer_open(Mixer *mixer)
try {
mixer->Open();
mixer->open = true;
mixer->failed = false;
mixer->failure = {};
} catch (...) {
mixer->failed = true;
mixer->failure = std::current_exception();
throw;
}
}
@ -75,6 +75,7 @@ mixer_close_internal(Mixer *mixer)
mixer->Close();
mixer->open = false;
mixer->failure = {};
}
void
@ -95,20 +96,6 @@ mixer_auto_close(Mixer *mixer)
mixer_close(mixer);
}
/*
* Close the mixer due to failure. The mutex must be locked before
* calling this function.
*/
static void
mixer_failed(Mixer *mixer)
{
assert(mixer->open);
mixer_close_internal(mixer);
mixer->failed = true;
}
int
mixer_get_volume(Mixer *mixer)
{
@ -116,7 +103,7 @@ mixer_get_volume(Mixer *mixer)
assert(mixer != nullptr);
if (mixer->plugin.global && !mixer->failed)
if (mixer->plugin.global && !mixer->failure)
mixer_open(mixer);
const std::scoped_lock<Mutex> protect(mixer->mutex);
@ -125,7 +112,8 @@ mixer_get_volume(Mixer *mixer)
try {
volume = mixer->GetVolume();
} catch (...) {
mixer_failed(mixer);
mixer_close_internal(mixer);
mixer->failure = std::current_exception();
throw;
}
} else
@ -140,11 +128,13 @@ mixer_set_volume(Mixer *mixer, unsigned volume)
assert(mixer != nullptr);
assert(volume <= 100);
if (mixer->plugin.global && !mixer->failed)
if (mixer->plugin.global && !mixer->failure)
mixer_open(mixer);
const std::scoped_lock<Mutex> protect(mixer->mutex);
if (mixer->open)
mixer->SetVolume(volume);
else if (mixer->failure)
std::rethrow_exception(mixer->failure);
}

14
src/mixer/MixerInternal.hxx
View File

@ -25,6 +25,8 @@
#include "thread/Mutex.hxx"
#include "util/Compiler.h"
#include <exception>
class MixerListener;
class Mixer {
@ -39,17 +41,17 @@ public:
*/
Mutex mutex;
/**
* Contains error details if this mixer has failed. If set,
* it should not be reopened automatically.
*/
std::exception_ptr failure;
/**
* Is the mixer device currently open?
*/
bool open = false;
/**
* Has this mixer failed, and should not be reopened
* automatically?
*/
bool failed = false;
public:
explicit Mixer(const MixerPlugin &_plugin,
MixerListener &_listener) noexcept