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python.c
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788 lines (666 loc) · 21.3 KB
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#define BACKEND_NAME "python"
#define PY_SSIZE_T_CLEAN
#include <string.h>
#include <Python.h>
#include "python.h"
#define MMPY_INSTANCE_KEY "midimonster_instance"
static PyThreadState* python_main = NULL;
static wchar_t* program_name = NULL;
static uint64_t last_timestamp = 0;
static uint32_t timer_interval = 0;
static size_t intervals = 0;
static mmpy_timer* interval = NULL;
MM_PLUGIN_API int init(){
backend python = {
.name = BACKEND_NAME,
.conf = python_configure,
.create = python_instance,
.conf_instance = python_configure_instance,
.channel = python_channel,
.handle = python_set,
.process = python_handle,
.start = python_start,
.interval = python_interval,
.shutdown = python_shutdown
};
//register backend
if(mm_backend_register(python)){
LOG("Failed to register backend");
return 1;
}
return 0;
}
static uint32_t python_interval(){
size_t u = 0;
uint32_t next_timer = 1000;
if(timer_interval){
for(u = 0; u < intervals; u++){
if(interval[u].interval &&
interval[u].interval - interval[u].delta < next_timer){
next_timer = interval[u].interval - interval[u].delta;
}
}
DBGPF("Next timer fires in %" PRIu32, next_timer);
return next_timer;
}
return 1000;
}
static void python_timer_recalculate(){
uint64_t next_interval = 0, gcd, residual;
size_t u;
//find lower interval bounds
for(u = 0; u < intervals; u++){
if(interval[u].interval && (!next_interval || interval[u].interval < next_interval)){
next_interval = interval[u].interval;
}
}
if(next_interval){
for(u = 0; u < intervals; u++){
if(interval[u].interval){
//calculate gcd of current interval and this timers interval
gcd = interval[u].interval;
while(gcd){
residual = next_interval % gcd;
next_interval = gcd;
gcd = residual;
}
//10msec is absolute lower limit and minimum gcd due to rounding
if(next_interval <= 10){
next_interval = 10;
break;
}
}
}
}
timer_interval = next_interval;
}
static int python_configure(char* option, char* value){
LOG("No backend configuration possible");
return 1;
}
static int python_prepend_str(PyObject* list, char* str){
if(!list || !str){
return 1;
}
PyObject* item = PyUnicode_FromString(str);
if(!item){
return 1;
}
if(PyList_Insert(list, 0, item) < 0){
Py_DECREF(item);
return 1;
}
Py_DECREF(item);
return 0;
}
static PyObject* mmpy_channels(PyObject* self, PyObject* args){
size_t u = 0;
PyObject* list = NULL;
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
if(!last_timestamp){
LOG("The channels() API will not return usable results before the configuration has been read completely");
}
list = PyList_New(data->channels);
for(u = 0; u < data->channels; u++){
PyList_SET_ITEM(list, u, PyUnicode_FromString(data->channel[u].name));
}
return list;
}
static PyObject* mmpy_output(PyObject* self, PyObject* args){
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
const char* channel_name = NULL;
channel_value val = {
{0}
};
size_t u;
if(!PyArg_ParseTuple(args, "sd", &channel_name, &val.normalised)){
return NULL;
}
val.normalised = clamp(val.normalised, 1.0, 0.0);
//if not started yet, create any requested channels so we can set them at load time
if(!last_timestamp){
python_channel(inst, (char*) channel_name, mmchannel_output);
}
for(u = 0; u < data->channels; u++){
if(!strcmp(data->channel[u].name, channel_name)){
DBGPF("Setting channel %s.%s to %f", inst->name, channel_name, val.normalised);
data->channel[u].out = val.normalised;
if(!last_timestamp){
data->channel[u].mark = 1;
}
else{
mm_channel_event(mm_channel(inst, u, 0), val);
}
return 0;
}
}
if(u == data->channels){
DBGPF("Output on unknown channel %s.%s, no event pushed", inst->name, channel_name);
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject* mmpy_channel_value(PyObject* self, PyObject* args, uint8_t in){
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
const char* channel_name = NULL;
size_t u;
if(!PyArg_ParseTuple(args, "s", &channel_name)){
return NULL;
}
for(u = 0; u < data->channels; u++){
if(!strcmp(data->channel[u].name, channel_name)){
return PyFloat_FromDouble(in ? data->channel[u].in : data->channel[u].out);
}
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject* mmpy_current_handler(PyObject* self, PyObject* args){
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
if(data->current_channel){
return PyUnicode_FromString(data->current_channel->name);
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject* mmpy_output_value(PyObject* self, PyObject* args){
return mmpy_channel_value(self, args, 0);
}
static PyObject* mmpy_input_value(PyObject* self, PyObject* args){
return mmpy_channel_value(self, args, 1);
}
static PyObject* mmpy_timestamp(PyObject* self, PyObject* args){
return PyLong_FromUnsignedLong(mm_timestamp());
}
static PyObject* mmpy_interval(PyObject* self, PyObject* args){
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
unsigned long updated_interval = 0;
PyObject* reference = NULL;
size_t u;
if(!PyArg_ParseTuple(args, "Ok", &reference, &updated_interval)){
return NULL;
}
if(!PyCallable_Check(reference)){
PyErr_SetString(PyExc_TypeError, "interval() requires a callable");
return NULL;
}
//round interval
if(updated_interval % 10 < 5){
updated_interval -= updated_interval % 10;
}
else{
updated_interval += (10 - (updated_interval % 10));
}
//find reference
for(u = 0; u < intervals; u++){
if(interval[u].interpreter == data->interpreter
&& PyObject_RichCompareBool(reference, interval[u].reference, Py_EQ) == 1){
DBGPF("Updating interval to %" PRIu64 " msec", updated_interval);
break;
}
}
//register new interval
if(u == intervals && updated_interval){
//create new interval slot
DBGPF("Registering interval with %" PRIu64 " msec", updated_interval);
interval = realloc(interval, (intervals + 1) * sizeof(mmpy_timer));
if(!interval){
intervals = 0;
LOG("Failed to allocate memory");
return NULL;
}
Py_INCREF(reference);
interval[intervals].delta = 0;
interval[intervals].reference = reference;
interval[intervals].interpreter = data->interpreter;
intervals++;
}
//update if existing or created
if(u < intervals){
interval[u].interval = updated_interval;
python_timer_recalculate();
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject* mmpy_cleanup_handler(PyObject* self, PyObject* args){
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
PyObject* current_handler = data->cleanup_handler;
if(!PyArg_ParseTuple(args, "O", &(data->cleanup_handler))
|| (data->cleanup_handler != Py_None && !PyCallable_Check(data->cleanup_handler))){
data->cleanup_handler = current_handler;
return NULL;
}
if(data->cleanup_handler == Py_None){
DBGPF("Cleanup handler removed on %s (previously %s)", inst->name, current_handler ? "active" : "inactive");
data->cleanup_handler = NULL;
}
else{
DBGPF("Cleanup handler installed on %s (previously %s)", inst->name, current_handler ? "active" : "inactive");
Py_INCREF(data->cleanup_handler);
}
if(!current_handler){
Py_INCREF(Py_None);
return Py_None;
}
//do not decrease refcount on current_handler here as the reference may be used by python code again
return current_handler;
}
static PyObject* mmpy_manage_fd(PyObject* self, PyObject* args){
instance* inst = *((instance**) PyModule_GetState(self));
python_instance_data* data = (python_instance_data*) inst->impl;
PyObject* handler = NULL, *sock = NULL, *fileno = NULL;
size_t u = 0, last_free = 0;
int fd = -1;
if(!PyArg_ParseTuple(args, "OO", &handler, &sock)
|| sock == Py_None
|| (handler != Py_None && !PyCallable_Check(handler))){
PyErr_SetString(PyExc_TypeError, "manage() requires either None or a callable and a socket-like object");
return NULL;
}
fileno = PyObject_CallMethod(sock, "fileno", NULL);
if(!fileno || fileno == Py_None || !PyLong_Check(fileno)){
PyErr_SetString(PyExc_TypeError, "manage() requires a socket-like object");
return NULL;
}
fd = PyLong_AsLong(fileno);
if(fd < 0){
PyErr_SetString(PyExc_TypeError, "manage() requires a (connected) socket-like object");
return NULL;
}
//check if this socket instance was already registered
last_free = data->sockets;
for(u = 0; u < data->sockets; u++){
if(!data->socket[u].socket){
last_free = u;
}
else if(PyObject_RichCompareBool(sock, data->socket[u].socket, Py_EQ) == 1){
break;
}
}
if(u < data->sockets){
//modify existing socket
Py_XDECREF(data->socket[u].handler);
if(handler != Py_None){
DBGPF("Updating handler for fd %d on %s", fd, inst->name);
data->socket[u].handler = handler;
Py_INCREF(handler);
}
else{
DBGPF("Unregistering fd %d on %s", fd, inst->name);
mm_manage_fd(data->socket[u].fd, BACKEND_NAME, 0, NULL);
Py_XDECREF(data->socket[u].socket);
data->socket[u].handler = NULL;
data->socket[u].socket = NULL;
data->socket[u].fd = -1;
}
}
else if(handler != Py_None){
//check that the fd is not already registered with another socket instance
for(u = 0; u < data->sockets; u++){
if(data->socket[u].fd == fd){
//FIXME this might also raise an exception
LOGPF("Descriptor already registered with another socket on instance %s", inst->name);
Py_INCREF(Py_None);
return Py_None;
}
}
DBGPF("Registering new fd %d on %s", fd, inst->name);
if(last_free == data->sockets){
//allocate a new socket instance
data->socket = realloc(data->socket, (data->sockets + 1) * sizeof(mmpy_socket));
if(!data->socket){
data->sockets = 0;
LOG("Failed to allocate memory");
return NULL;
}
data->sockets++;
}
//store new reference
//FIXME check this for errors
mm_manage_fd(fd, BACKEND_NAME, 1, inst);
data->socket[last_free].fd = fd;
Py_INCREF(handler);
data->socket[last_free].handler = handler;
Py_INCREF(sock);
data->socket[last_free].socket = sock;
}
Py_INCREF(Py_None);
return Py_None;
}
static int mmpy_exec(PyObject* module) {
instance** inst = (instance**) PyModule_GetState(module);
//FIXME actually use interpreter dict (from python 3.8) here at some point
PyObject* capsule = PyDict_GetItemString(PyThreadState_GetDict(), MMPY_INSTANCE_KEY);
if(capsule && inst){
*inst = PyCapsule_GetPointer(capsule, NULL);
return 0;
}
PyErr_SetString(PyExc_AssertionError, "Failed to pass instance pointer for initialization");
return -1;
}
static int python_configure_instance(instance* inst, char* option, char* value){
python_instance_data* data = (python_instance_data*) inst->impl;
PyObject* module = NULL;
//load python script
if(!strcmp(option, "module")){
//swap to interpreter
PyEval_RestoreThread(data->interpreter);
//import the module
module = PyImport_ImportModule(value);
if(!module){
LOGPF("Failed to import module %s to instance %s", value, inst->name);
PyErr_Print();
}
Py_XDECREF(module);
PyEval_ReleaseThread(data->interpreter);
return 0;
}
else if(!strcmp(option, "default-handler")){
free(data->default_handler);
data->default_handler = strdup(value);
return 0;
}
LOGPF("Unknown instance parameter %s for instance %s", option, inst->name);
return 1;
}
static PyObject* mmpy_init(){
static PyModuleDef_Slot mmpy_slots[] = {
{Py_mod_exec, (void*) mmpy_exec},
{0}
};
static PyMethodDef mmpy_methods[] = {
{"output", mmpy_output, METH_VARARGS, "Output a channel event on the instance"},
{"inputvalue", mmpy_input_value, METH_VARARGS, "Get last input value for a channel on the instance"},
{"outputvalue", mmpy_output_value, METH_VARARGS, "Get the last output value for a channel on the instance"},
{"current", mmpy_current_handler, METH_VARARGS, "Get the name of the currently executing channel handler"},
{"timestamp", mmpy_timestamp, METH_VARARGS, "Get the core timestamp (in milliseconds)"},
{"manage", mmpy_manage_fd, METH_VARARGS, "(Un-)register a socket or file descriptor for notifications"},
{"interval", mmpy_interval, METH_VARARGS, "Register or update an interval handler"},
{"channels", mmpy_channels, METH_VARARGS, "List currently registered instance channels"},
{"cleanup_handler", mmpy_cleanup_handler, METH_VARARGS, "Register or update the instances cleanup handler"},
{0}
};
static struct PyModuleDef mmpy = {
PyModuleDef_HEAD_INIT,
"midimonster",
NULL, /*doc size*/
sizeof(instance*),
mmpy_methods,
mmpy_slots
};
//single-phase init
//return PyModule_Create(&mmpy);
//multi-phase init
return PyModuleDef_Init(&mmpy);
}
static int python_instance(instance* inst){
python_instance_data* data = calloc(1, sizeof(python_instance_data));
PyObject* interpreter_dict = NULL;
char current_directory[8192];
if(!data){
LOG("Failed to allocate memory");
return 1;
}
//lazy-init because we need the interpreter running before _start,
//but don't want it running if no instances are defined
if(!python_main){
LOG("Initializing main python interpreter");
if(PyImport_AppendInittab("midimonster", &mmpy_init)){
LOG("Failed to extend python inittab for main interpreter");
}
program_name = Py_DecodeLocale("midimonster", NULL);
Py_SetProgramName(program_name);
//initialize python
Py_InitializeEx(0);
//create, acquire and release the GIL
PyEval_InitThreads();
python_main = PyEval_SaveThread();
}
//acquire the GIL before creating a new interpreter
PyEval_RestoreThread(python_main);
//create subinterpreter for new instance
data->interpreter = Py_NewInterpreter();
//push cwd as import path
if(getcwd(current_directory, sizeof(current_directory))){
if(python_prepend_str(PySys_GetObject("path"), current_directory)){
LOG("Failed to push current working directory to python");
goto bail;
}
}
//push the instance pointer for later module initialization
//FIXME python 3.8 introduces interpreter_dict = PyInterpreterState_GetDict(data->interpreter->interp);
//for now use thread state...
interpreter_dict = PyThreadState_GetDict();
if(!interpreter_dict){
LOG("Failed to access per-interpreter data storage");
goto bail;
}
//FIXME this might leak a reference to the capsule
if(PyDict_SetItemString(interpreter_dict, MMPY_INSTANCE_KEY, PyCapsule_New(inst, NULL, NULL))){
LOG("Failed to set per-interpreter instance pointer");
goto bail;
}
//NewInterpreter leaves us with the GIL, drop it
PyEval_ReleaseThread(data->interpreter);
inst->impl = data;
return 0;
bail:
if(data->interpreter){
PyEval_ReleaseThread(data->interpreter);
}
free(data);
return 1;
}
static channel* python_channel(instance* inst, char* spec, uint8_t flags){
python_instance_data* data = (python_instance_data*) inst->impl;
size_t u;
for(u = 0; u < data->channels; u++){
if(!strcmp(data->channel[u].name, spec)){
break;
}
}
if(u == data->channels){
data->channel = realloc(data->channel, (data->channels + 1) * sizeof(mmpython_channel));
if(!data->channel){
data->channels = 0;
LOG("Failed to allocate memory");
return NULL;
}
memset(data->channel + u, 0, sizeof(mmpython_channel));
data->channel[u].name = strdup(spec);
if(!data->channel[u].name){
LOG("Failed to allocate memory");
return NULL;
}
data->channels++;
}
return mm_channel(inst, u, 1);
}
static int python_set(instance* inst, size_t num, channel** c, channel_value* v){
python_instance_data* data = (python_instance_data*) inst->impl;
mmpython_channel* chan = NULL;
PyObject* result = NULL;
size_t u;
//swap to interpreter
PyEval_RestoreThread(data->interpreter);
for(u = 0; u < num; u++){
chan = data->channel + c[u]->ident;
//call handler if present
if(chan->handler){
DBGPF("Calling handler for %s.%s", inst->name, chan->name);
data->current_channel = chan;
result = PyObject_CallFunction(chan->handler, "d", v[u].normalised);
Py_XDECREF(result);
data->current_channel = NULL;
DBGPF("Done with handler for %s.%s", inst->name, chan->name);
}
//update input value buffer after finishing the handler
chan->in = v[u].normalised;
}
//release interpreter
PyEval_ReleaseThread(data->interpreter);
return 0;
}
static int python_handle(size_t num, managed_fd* fds){
instance* inst = NULL;
python_instance_data* data = NULL;
PyObject* result = NULL;
size_t u, p;
//handle intervals
if(timer_interval){
uint64_t delta = mm_timestamp() - last_timestamp;
last_timestamp = mm_timestamp();
//add delta to all active timers
for(u = 0; u < intervals; u++){
if(interval[u].interval){
interval[u].delta += delta;
//if timer expired, call handler
if(interval[u].delta >= interval[u].interval){
interval[u].delta %= interval[u].interval;
DBGPF("Calling interval handler %" PRIsize_t ", last delta %" PRIu64, u, delta);
//swap to interpreter
PyEval_RestoreThread(interval[u].interpreter);
//call handler
result = PyObject_CallFunction(interval[u].reference, NULL);
Py_XDECREF(result);
//release interpreter
PyEval_ReleaseThread(interval[u].interpreter);
}
}
}
}
for(u = 0; u < num; u++){
inst = (instance*) fds[u].impl;
data = (python_instance_data*) inst->impl;
//swap to interpreter
PyEval_RestoreThread(data->interpreter);
//handle callbacks
for(p = 0; p < data->sockets; p++){
if(data->socket[p].socket
&& data->socket[p].fd == fds[u].fd){
//FIXME maybe close/unregister the socket on handling errors
DBGPF("Calling descriptor handler on %s for fd %d", inst->name, data->socket[p].fd);
result = PyObject_CallFunction(data->socket[p].handler, "O", data->socket[p].socket);
Py_XDECREF(result);
}
}
//release interpreter
PyEval_ReleaseThread(data->interpreter);
}
return 0;
}
static PyObject* python_resolve_symbol(char* spec_raw){
char* module_name = NULL, *object_name = NULL, *spec = strdup(spec_raw);
PyObject* module = NULL, *result = NULL;
module = PyImport_AddModule("__main__");
object_name = spec;
module_name = strchr(object_name, '.');
if(module_name){
*module_name = 0;
//returns borrowed reference
module = PyImport_AddModule(object_name);
if(!module){
LOGPF("Module %s for symbol %s.%s is not loaded", object_name, object_name, module_name + 1);
return NULL;
}
object_name = module_name + 1;
//returns new reference
result = PyObject_GetAttrString(module, object_name);
}
free(spec);
return result;
}
static int python_start(size_t n, instance** inst){
python_instance_data* data = NULL;
size_t u, p;
channel_value v;
//resolve channel references to handler functions
for(u = 0; u < n; u++){
data = (python_instance_data*) inst[u]->impl;
DBGPF("Starting up instance %s", inst[u]->name);
//switch to interpreter
PyEval_RestoreThread(data->interpreter);
if(data->default_handler){
data->handler = python_resolve_symbol(data->default_handler);
}
for(p = 0; p < data->channels; p++){
if(!strchr(data->channel[p].name, '.') && data->handler){
data->channel[p].handler = data->handler;
}
else{
data->channel[p].handler = python_resolve_symbol(data->channel[p].name);
}
//push initial values
if(data->channel[p].mark){
v.normalised = data->channel[p].out;
mm_channel_event(mm_channel(inst[u], p, 0), v);
}
}
//release interpreter
PyEval_ReleaseThread(data->interpreter);
}
return 0;
}
static int python_shutdown(size_t n, instance** inst){
size_t u, p;
PyObject* result = NULL;
python_instance_data* data = NULL;
//if there are no instances, the python interpreter is not started, so cleanup can be skipped
if(python_main){
//release interval references
for(p = 0; p < intervals; p++){
//swap to interpreter
PyEval_RestoreThread(interval[p].interpreter);
Py_XDECREF(interval[p].reference);
PyEval_ReleaseThread(interval[p].interpreter);
}
//lock the GIL for later interpreter release
PyEval_RestoreThread(python_main);
for(u = 0; u < n; u++){
data = (python_instance_data*) inst[u]->impl;
//swap to interpreter to be safe for releasing the references
PyThreadState_Swap(data->interpreter);
//run cleanup handler before cleaning up channel data to allow reading channel data
if(data->cleanup_handler){
result = PyObject_CallFunction(data->cleanup_handler, NULL);
Py_XDECREF(result);
Py_XDECREF(data->cleanup_handler);
}
//clean up channels
for(p = 0; p < data->channels; p++){
free(data->channel[p].name);
Py_XDECREF(data->channel[p].handler);
}
free(data->channel);
free(data->default_handler);
Py_XDECREF(data->handler);
//close sockets
for(p = 0; p < data->sockets; p++){
close(data->socket[p].fd); //FIXME does python do this on its own?
Py_XDECREF(data->socket[p].socket);
Py_XDECREF(data->socket[p].handler);
}
//shut down interpreter, GIL is held after this but state is NULL
DBGPF("Shutting down interpreter for instance %s", inst[u]->name);
PyErr_Clear();
//PyThreadState_Clear(data->interpreter);
Py_EndInterpreter(data->interpreter);
free(data);
}
//shut down main interpreter
PyThreadState_Swap(python_main);
if(Py_FinalizeEx()){
LOG("Failed to shut down python library");
}
PyMem_RawFree(program_name);
}
LOG("Backend shut down");
return 0;
}
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