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/* Hook-releated functions.

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

#include <villas/hook.hpp>

#include <villas/hook_list.hpp>

#include <villas/list.hpp>

#include <villas/plugin.hpp>

#include <villas/sample.hpp>

#include <villas/utils.hpp>

using namespace villas;

using namespace villas::node;

void HookList::parse(json_t *json, int mask, Path *o, Node *n) {

if (!json_is_array(json))

throw ConfigError(json, "node-config-hook",

"Hooks must be configured as a list of hook objects");

size_t i;

json_t *json_hook;

json_array_foreach(json, i, json_hook) {

int ret;

const char *type;

Hook::Ptr h;

json_error_t err;

json_t *json_config;

switch (json_typeof(json_hook)) {

case JSON_STRING:

type = json_string_value(json_hook);

json_config = json_object();

break;

case JSON_OBJECT:

ret = json_unpack_ex(json_hook, &err, 0, "{ s: s }", "type", &type);

if (ret)

throw ConfigError(json_hook, err, "node-config-hook",

"Failed to parse hook");

json_config = json_hook;

break;

default:

throw ConfigError(json_hook, "node-config-hook",

"Hook must be configured by simple string or object");

}

auto hf = plugin::registry->lookup<HookFactory>(type);

if (!hf)

throw ConfigError(json_hook, "node-config-hook", "Unknown hook type '{}'",

type);

if (!(hf->getFlags() & mask))

throw ConfigError(json_hook, "node-config-hook",

"Hook '{}' not allowed here", type);

h = hf->make(o, n);

h->parse(json_config);

push_back(h);

}

void HookList::check() {

for (auto h : *this)

h->check();

}

void HookList::prepare(SignalList::Ptr signals, int m, Path *p, Node *n) {

if (!m)

goto skip_add;

// Add internal hooks if they are not already in the list

for (auto f : plugin::registry->lookup<HookFactory>()) {

if ((f->getFlags() & m) == m) {

auto h = f->make(p, n);

push_back(h);

}

skip_add:

// Remove filters which are not enabled

remove_if([](Hook::Ptr h) { return !h->isEnabled(); });

// We sort the hooks according to their priority

sort([](const value_type &a, const value_type b) {

return a->getPriority() < b->getPriority();

});

unsigned i = 0;

auto sigs = signals;

for (auto h : *this) {

h->prepare(sigs);

sigs = h->getSignals();

auto logger = h->getLogger();

logger->debug("Signal list after hook #{}:", i++);

if (logger->level() <= spdlog::level::debug)

sigs->dump(logger);

}

int HookList::process(struct Sample *smps[], unsigned cnt) {

unsigned current, processed = 0;

if (size() == 0)

return cnt;

for (current = 0; current < cnt; current++) {

struct Sample *smp = smps[current];

for (auto h : *this) {

auto ret = h->process(smp);

smp->signals = h->getSignals();

switch (ret) {

case Hook::Reason::ERROR:

return -1;

case Hook::Reason::OK:

continue;

case Hook::Reason::SKIP_SAMPLE:

goto skip;

case Hook::Reason::STOP_PROCESSING:

goto stop;

}

stop:

SWAP(smps[processed], smps[current]);

processed++;

skip: {}

}

return processed;

}

void HookList::periodic() {

for (auto h : *this)

h->periodic();

}

void HookList::start() {

for (auto h : *this)

h->start();

}

void HookList::stop() {

for (auto h : *this)

h->stop();

}

SignalList::Ptr HookList::getSignals() const {

auto h = back();

if (!h)

return nullptr;

return h->getSignals();

}

unsigned HookList::getSignalsMaxCount() const {

unsigned max_cnt = 0;

for (auto h : *this) {

unsigned sigs_cnt = h->getSignals()->size();

if (sigs_cnt > max_cnt)

max_cnt = sigs_cnt;

}

return max_cnt;

}

json_t *HookList::toJson() const {

json_t *json_hooks = json_array();

for (auto h : *this)

json_array_append(json_hooks, h->getConfig());

return json_hooks;

}

void HookList::dump(Logger logger, std::string subject) const {

logger->debug("Hooks of {}:", subject);

unsigned i = 0;

for (auto h : *this)

logger->debug(" {}: {}", i++, h->getFactory()->getName());

}

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