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404 lines (336 loc) · 11.5 KB
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/* Python-binding.
*
* Author: Kevin Vu te Laar <vu.te@rwth-aachen.de>
* SPDX-FileCopyrightText: 2014-2025 Institute for Automation of Complex Power
* Systems, RWTH Aachen University SPDX-License-Identifier: Apache-2.0
*/
#include <cstdint>
#include <optional>
#include <stdexcept>
#include <jansson.h>
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <sys/types.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include <villas/node.hpp>
#include <villas/sample.hpp>
#include <villas/timing.hpp>
extern "C" {
#include <villas/node.h>
}
namespace py = pybind11;
class SamplesArray {
public:
SamplesArray(unsigned int len = 0) {
smps = (len > 0) ? new vsample *[len]() : nullptr;
this->len = len;
}
SamplesArray(const SamplesArray &) = delete;
SamplesArray &operator=(const SamplesArray &) = delete;
~SamplesArray() {
if (!smps)
return;
for (unsigned int i = 0; i < len; ++i) {
if (smps[i]) {
sample_decref(smps[i]);
smps[i] = nullptr;
}
}
delete[] smps;
}
void *get_block(unsigned int start) {
return reinterpret_cast<void *>(&smps[start]);
}
void bulk_alloc(unsigned int start_idx, unsigned int stop_idx,
unsigned int smpl_len) {
for (unsigned int i = start_idx; i < stop_idx; ++i) {
if (smps[i]) {
sample_decref(smps[i]);
}
smps[i] = sample_alloc(smpl_len);
}
}
/*
* Performs a resize of the underlying SamplesArray copying each Sample.
* Shrinking has asymmetric behavior which may be undesired.
* Therefore use clear().
*/
int grow(unsigned int add) {
unsigned int new_len = this->len + add;
vsample **smps_new = new vsample *[new_len]();
for (unsigned int i = 0; i < this->len; ++i) {
smps_new[i] = smps[i];
}
delete[] smps;
this->smps = smps_new;
this->len = new_len;
return new_len;
}
int clear() {
if (this->smps) {
unsigned int i = 0;
for (; i < len; ++i) {
sample_decref(smps[i]);
smps[i] = nullptr;
}
delete[] smps;
smps = nullptr;
this->len = 0;
return i;
}
return -1;
}
vsample *&operator[](unsigned int idx) {
vsample *&ref = smps[idx];
return ref;
}
vsample *operator[](unsigned int idx) const { return smps[idx]; }
vsample **get_smps() { return smps; }
unsigned int size() const { return len; }
private:
vsample **smps;
unsigned int len;
};
struct timespec ns_to_timespec(int64_t time_ns) {
struct timespec ts;
ts.tv_nsec = time_ns / 1'000'000'000LL;
ts.tv_sec = time_ns % 1'000'000'000LL;
return ts;
}
/* pybind11 can not deal with (void **) as function input parameters,
* therefore cast a simple (void *) pointer to the corresponding type
*
* wrapper bindings, sorted alphabetically
* @param villas_node Name of the module to be bound
* @param m Access variable for modifying the module code
*/
PYBIND11_MODULE(python_binding, m) {
m.def("memory_init", &memory_init);
m.def("node_check", [](void *n) -> int {
return node_check(reinterpret_cast<vnode *>(n));
});
m.def("node_destroy", [](void *n) -> int {
return node_destroy(reinterpret_cast<vnode *>(n));
});
m.def(
"node_details",
[](void *n) -> const char * {
return node_details(reinterpret_cast<vnode *>(n));
},
py::return_value_policy::copy);
m.def("node_input_signals_max_cnt", [](void *n) -> unsigned {
return node_input_signals_max_cnt(reinterpret_cast<vnode *>(n));
});
m.def("node_is_enabled", [](void *n) -> bool {
return node_is_enabled(reinterpret_cast<const vnode *>(n));
});
m.def("node_is_valid_name",
[](const char *name) -> bool { return node_is_valid_name(name); });
m.def(
"node_name",
[](void *n) -> const char * {
return node_name(reinterpret_cast<vnode *>(n));
},
py::return_value_policy::copy);
m.def(
"node_name_full",
[](void *n) -> const char * {
return node_name_full(reinterpret_cast<vnode *>(n));
},
py::return_value_policy::copy);
m.def(
"node_name_short",
[](void *n) -> const char * {
return node_name_short(reinterpret_cast<vnode *>(n));
},
py::return_value_policy::copy);
m.def(
"node_new",
[](const char *json_str, const char *id_str) -> vnode * {
json_error_t err;
uuid_t id;
uuid_parse(id_str, id);
auto *json = json_loads(json_str, 0, &err);
void *it = json_object_iter(json);
json_t *inner = json_object_iter_value(it);
if (json_is_object(inner)) { // create node with name
return reinterpret_cast<vnode *>(villas::node::NodeFactory::make(
json_object_iter_value(it), id, json_object_iter_key(it)));
} else { // create node without name
char *capi_str = json_dumps(json, 0);
auto ret = node_new(id_str, capi_str);
free(capi_str);
return ret;
}
},
py::return_value_policy::take_ownership);
m.def("node_output_signals_max_cnt", [](void *n) -> unsigned {
return node_output_signals_max_cnt(reinterpret_cast<vnode *>(n));
});
m.def("node_pause", [](void *n) -> int {
return node_pause(reinterpret_cast<vnode *>(n));
});
m.def("node_prepare", [](void *n) -> int {
return node_prepare(reinterpret_cast<vnode *>(n));
});
m.def("node_read", [](void *n, SamplesArray &a, unsigned cnt) -> int {
return node_read(reinterpret_cast<vnode *>(n), a.get_smps(), cnt);
});
m.def("node_read", [](void *n, void *smpls, unsigned cnt) -> int {
return node_read(reinterpret_cast<vnode *>(n),
reinterpret_cast<vsample **>(smpls), cnt);
});
m.def("node_restart", [](void *n) -> int {
return node_restart(reinterpret_cast<vnode *>(n));
});
m.def("node_resume", [](void *n) -> int {
return node_resume(reinterpret_cast<vnode *>(n));
});
m.def("node_reverse", [](void *n) -> int {
return node_reverse(reinterpret_cast<vnode *>(n));
});
m.def("node_start", [](void *n) -> int {
return node_start(reinterpret_cast<vnode *>(n));
});
m.def("node_stop",
[](void *n) -> int { return node_stop(reinterpret_cast<vnode *>(n)); });
m.def("node_to_json_str", [](void *n) -> py::str {
auto json = reinterpret_cast<villas::node::Node *>(n)->toJson();
char *json_str = json_dumps(json, 0);
auto py_str = py::str(json_str);
json_decref(json);
free(json_str);
return py_str;
});
m.def("node_write", [](void *n, SamplesArray &a, unsigned cnt) -> int {
return node_write(reinterpret_cast<vnode *>(n), a.get_smps(), cnt);
});
m.def("node_write", [](void *n, void *smpls, unsigned cnt) -> int {
return node_write(reinterpret_cast<vnode *>(n),
reinterpret_cast<vsample **>(smpls), cnt);
});
m.def(
"smps_array",
[](unsigned int len) -> SamplesArray * { return new SamplesArray(len); },
py::return_value_policy::take_ownership);
m.def("sample_alloc",
[](unsigned int len) -> vsample * { return sample_alloc(len); });
// Decrease reference count and release memory if last reference was held.
m.def("sample_decref", [](void *smps) -> void {
auto smp = reinterpret_cast<vsample **>(smps);
sample_decref(*smp);
});
m.def("sample_length", [](void *smp) -> unsigned {
if (smp) {
return sample_length(reinterpret_cast<vsample *>(smp));
} else {
return -1;
}
});
m.def(
"sample_pack",
[](void *s, std::optional<int64_t> ts_origin_ns,
std::optional<int64_t> ts_received_ns) -> vsample * {
auto smp = reinterpret_cast<villas::node::Sample *>(s);
uint64_t *seq = &smp->sequence;
unsigned len = smp->length;
double *values = reinterpret_cast<double *>(smp->data);
struct timespec ts_origin =
ts_origin_ns ? ns_to_timespec(*ts_origin_ns) : smp->ts.origin;
struct timespec ts_received =
ts_received_ns ? ns_to_timespec(*ts_received_ns) : smp->ts.received;
return sample_pack(seq, &ts_origin, &ts_received, len, values);
},
py::return_value_policy::reference);
m.def(
"sample_pack",
[](const py::list values, std::optional<int64_t> ts_origin_ns,
std::optional<int64_t> ts_received_ns, unsigned seq = 0) -> void * {
struct timespec ts_origin =
ts_origin_ns ? ns_to_timespec(*ts_origin_ns) : time_now();
struct timespec ts_received =
ts_received_ns ? ns_to_timespec(*ts_received_ns) : time_now();
unsigned values_len = values.size();
double cvalues[values_len];
for (unsigned int i = 0; i < values_len; ++i) {
cvalues[i] = values[i].cast<double>();
}
uint64_t sequence = seq;
return reinterpret_cast<void *>(sample_pack(
&sequence, &ts_origin, &ts_received, values_len, cvalues));
},
py::return_value_policy::reference);
m.def(
"sample_unpack",
[](void *ss, void *ds) -> void {
auto dSmp = reinterpret_cast<villas::node::Sample **>(ds);
auto srcSmp = reinterpret_cast<villas::node::Sample *>(ss);
auto &destSmp = *dSmp;
if (!srcSmp) {
throw std::runtime_error("Tried to unpack empty sample!");
}
if (!destSmp) {
goto alloc;
}
if (destSmp->capacity < srcSmp->length) {
sample_decref(reinterpret_cast<vsample *>(destSmp));
goto alloc;
}
if (0) {
alloc:
*dSmp = reinterpret_cast<villas::node::Sample *>(
sample_alloc(srcSmp->length));
destSmp = *dSmp;
}
uint64_t *seq = &destSmp->sequence;
struct timespec *ts_origin = &destSmp->ts.origin;
struct timespec *ts_received = &destSmp->ts.received;
int *flags = &destSmp->flags;
unsigned *len = &destSmp->length;
double *values = reinterpret_cast<double *>(destSmp->data);
sample_unpack(reinterpret_cast<vsample *>(srcSmp), seq, ts_origin,
ts_received, flags, len, values);
},
py::return_value_policy::reference);
m.def("sample_details", [](void *s) {
auto smp = reinterpret_cast<villas::node::Sample *>(s);
if (!smp) {
return py::dict();
}
py::dict d;
d["sequence"] = smp->sequence;
d["length"] = smp->length;
d["capacity"] = smp->capacity;
d["flags"] = smp->flags;
d["refcnt"] = smp->refcnt.load();
d["ts_origin"] = time_to_double(&smp->ts.origin);
d["ts_received"] = time_to_double(&smp->ts.received);
py::list data;
for (unsigned int i = 0; i < smp->length; ++i) {
data.append(static_cast<double>(smp->data[i]));
}
d["data"] = data;
return d;
});
py::class_<SamplesArray>(m, "SamplesArray")
.def(py::init<unsigned int>(), py::arg("len"))
.def("__getitem__",
[](SamplesArray &a, unsigned int idx) {
assert(idx < a.size() && "Index out of bounds");
return a[idx];
})
.def("__setitem__",
[](SamplesArray &a, unsigned int idx, void *smp) {
assert(idx < a.size() && "Index out of bounds");
if (a[idx]) {
sample_decref(a[idx]);
}
a[idx] = reinterpret_cast<vsample *>(smp);
})
.def("__len__", &SamplesArray::size)
.def("bulk_alloc", &SamplesArray::bulk_alloc)
.def("grow", &SamplesArray::grow)
.def("get_block", &SamplesArray::get_block)
.def("clear", &SamplesArray::clear);
}
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