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526 lines (408 loc) · 11.8 KB
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/* The super node object holding the state of the application.
*
* 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 <cstdlib>
#include <cstring>
#include <map>
#include <villas/config_helper.hpp>
#include <villas/hook_list.hpp>
#include <villas/kernel/if.hpp>
#include <villas/kernel/rt.hpp>
#include <villas/log.hpp>
#include <villas/node.hpp>
#include <villas/node/exceptions.hpp>
#include <villas/node/memory.hpp>
#include <villas/path.hpp>
#include <villas/super_node.hpp>
#include <villas/timing.hpp>
#include <villas/uuid.hpp>
#ifdef WITH_NETEM
#include <villas/kernel/nl.hpp>
#endif
using namespace villas;
using namespace villas::node;
SuperNode::SuperNode()
: state(State::INITIALIZED), idleStop(false),
#ifdef WITH_API
api(this),
#endif
#ifdef WITH_WEB
#ifdef WITH_API
web(&api),
#else
web(),
#endif
#endif
seed(0), priority(0), affinity(0), hugepages(DEFAULT_NR_HUGEPAGES),
statsRate(1.0), task(), started(time_now()) {
int ret;
char hname[128];
ret = gethostname(hname, sizeof(hname));
if (ret)
throw SystemError("Failed to determine hostname");
// Default UUID is derived from hostname
uuid::generateFromString(uuid, hname);
#ifdef WITH_NETEM
kernel::nl::init(); // Fill link cache
#endif // WITH_NETEM
logger = Log::get("super_node");
}
void SuperNode::parse(const std::string &u) {
config.root = config.load(u);
parse(config.root);
}
void SuperNode::parse(json_t *root) {
int ret;
assert(state == State::PARSED || state == State::INITIALIZED ||
state == State::CHECKED);
const char *uuid_str = nullptr;
json_t *json_nodes = nullptr;
json_t *json_paths = nullptr;
json_t *json_logging = nullptr;
json_t *json_http = nullptr;
json_error_t err;
int stop = -1;
ret = json_unpack_ex(root, &err, 0,
"{ s?: F, s?: o, s?: o, s?: o, s?: o, s?: i, s?: i, s?: "
"i, s?: b, s?: s, s?: i }",
"stats", &statsRate, "http", &json_http, "logging",
&json_logging, "nodes", &json_nodes, "paths",
&json_paths, "hugepages", &hugepages, "affinity",
&affinity, "priority", &priority, "idle_stop", &stop,
"uuid", &uuid_str, "seed", &seed);
if (ret)
throw ConfigError(root, err, "node-config",
"Unpacking top-level config failed");
if (stop >= 0) {
idleStop = stop > 0;
}
if (uuid_str) {
ret = uuid_parse(uuid_str, uuid);
if (ret)
throw ConfigError(root, "node-config-uuid", "Failed to parse UUID: {}",
uuid_str);
}
#ifdef WITH_WEB
if (json_http)
web.parse(json_http);
#endif // WITH_WEB
if (json_logging)
Log::getInstance().parse(json_logging);
// Parse nodes
if (json_nodes) {
if (!json_is_object(json_nodes))
throw ConfigError(
json_nodes, "node-config-nodes",
"Setting 'nodes' must be a group with node name => group mappings.");
const char *node_name;
json_t *json_node;
json_object_foreach(json_nodes, node_name, json_node) {
uuid_t node_uuid;
const char *node_type;
const char *node_uuid_str = nullptr;
ret = Node::isValidName(node_name);
if (!ret)
throw RuntimeError("Invalid name for node: {}", node_name);
ret = json_unpack_ex(json_node, &err, 0, "{ s: s, s?: s }", "type",
&node_type, "uuid", &node_uuid_str);
if (ret)
throw ConfigError(root, err, "node-config-node-type",
"Failed to parse type of node '{}'", node_name);
if (node_uuid_str) {
ret = uuid_parse(uuid_str, uuid);
if (ret)
throw ConfigError(json_node, "node-config-node-uuid",
"Failed to parse UUID: {}", uuid_str);
} else
// Generate UUID from node name and super-node UUID
uuid::generateFromString(node_uuid, node_name, uuid::toString(uuid));
auto *n = NodeFactory::make(node_type, node_uuid, node_name);
if (!n)
throw MemoryAllocationError();
n->configPath = getConfigPath();
ret = n->parse(json_node);
if (ret) {
auto config_id = fmt::format("node-config-node-{}", node_type);
throw ConfigError(json_node, config_id,
"Failed to parse configuration of node '{}'",
node_name);
}
nodes.push_back(n);
}
}
// Parse paths
if (json_paths) {
if (!json_is_array(json_paths))
logger->warn("Setting 'paths' must be a list of objects");
size_t i;
json_t *json_path;
json_array_foreach(json_paths, i, json_path) {
parse:
auto *p = new Path();
if (!p)
throw MemoryAllocationError();
p->parse(json_path, nodes, uuid);
paths.push_back(p);
if (p->isReversed()) {
// Only simple paths can be reversed
ret = p->isSimple();
if (!ret)
throw RuntimeError("Complex paths can not be reversed!");
// Parse a second time with in/out reversed
json_path = json_copy(json_path);
json_t *json_in = json_object_get(json_path, "in");
json_t *json_out = json_object_get(json_path, "out");
if (json_equal(json_in, json_out))
throw RuntimeError(
"Can not reverse path with identical in/out nodes!");
json_object_set(json_path, "reverse", json_false());
json_object_set(json_path, "in", json_out);
json_object_set(json_path, "out", json_in);
goto parse;
}
}
}
state = State::PARSED;
}
void SuperNode::check() {
int ret;
assert(state == State::INITIALIZED || state == State::PARSED ||
state == State::CHECKED);
for (auto *n : nodes) {
ret = n->check();
if (ret)
throw RuntimeError("Invalid configuration for node {}", n->getName());
}
for (auto *p : paths)
p->check();
state = State::CHECKED;
}
void SuperNode::prepareNodeTypes() {
int ret;
for (auto *n : nodes) {
auto *nf = n->getFactory();
if (nf->getState() == State::STARTED)
continue;
ret = nf->start(this);
if (ret)
throw RuntimeError("Failed to start node-type: {}",
n->getFactory()->getName());
}
}
void SuperNode::startInterfaces() {
#ifdef WITH_NETEM
int ret;
for (auto *i : interfaces) {
ret = i->start();
if (ret)
throw RuntimeError("Failed to start network interface: {}", i->getName());
}
#endif // WITH_NETEM
}
void SuperNode::startNodes() {
int ret;
for (auto *n : nodes) {
if (!n->isEnabled())
continue;
ret = n->start();
if (ret)
throw RuntimeError("Failed to start node: {}", n->getName());
}
}
void SuperNode::startPaths() {
for (auto *p : paths) {
if (!p->isEnabled())
continue;
p->start();
}
}
void SuperNode::prepareNodes() {
int ret;
for (auto *n : nodes) {
if (!n->isEnabled())
continue;
ret = n->prepare();
if (ret)
throw RuntimeError("Failed to prepare node: {}", n->getName());
}
}
void SuperNode::preparePaths() {
for (auto *p : paths) {
if (!p->isEnabled())
continue;
p->prepare(nodes);
}
}
void SuperNode::prepare() {
int ret;
assert(state == State::CHECKED);
ret = memory::init(hugepages);
if (ret)
throw RuntimeError("Failed to initialize memory system");
kernel::rt::init(priority, affinity);
prepareNodeTypes();
prepareNodes();
preparePaths();
for (auto *n : nodes) {
if (n->sources.size() == 0 && n->destinations.size() == 0) {
logger->info("Node {} is not used by any path. Disabling...",
n->getName());
n->setEnabled(false);
}
}
state = State::PREPARED;
}
void SuperNode::start() {
assert(state == State::PREPARED);
srand(seed);
#ifdef WITH_API
api.start();
#endif
#ifdef WITH_WEB
web.start();
#endif
startInterfaces();
startNodes();
startPaths();
if (statsRate > 0) // A rate <0 will disable the periodic stats
task.setRate(statsRate);
Stats::printHeader(Stats::Format::HUMAN);
state = State::STARTED;
}
void SuperNode::stopPaths() {
for (auto *p : paths) {
if (p->getState() == State::STARTED || p->getState() == State::PAUSED)
p->stop();
}
}
void SuperNode::stopNodes() {
int ret;
for (auto *n : nodes) {
if (n->getState() == State::STARTED || n->getState() == State::PAUSED ||
n->getState() == State::STOPPING) {
ret = n->stop();
if (ret)
throw RuntimeError("Failed to stop node: {}", n->getName());
}
}
}
void SuperNode::stopNodeTypes() {
int ret;
for (auto *n : nodes) {
auto *nf = n->getFactory();
if (nf->getState() != State::STARTED)
continue;
ret = nf->stop();
if (ret)
throw RuntimeError("Failed to stop node-type: {}",
n->getFactory()->getName());
}
}
void SuperNode::stopInterfaces() {
#ifdef WITH_NETEM
int ret;
for (auto *i : interfaces) {
ret = i->stop();
if (ret)
throw RuntimeError("Failed to stop interface: {}", i->getName());
}
#endif // WITH_NETEM
}
void SuperNode::stop() {
stopNodes();
stopPaths();
stopNodeTypes();
stopInterfaces();
#ifdef WITH_API
api.stop();
#endif
#ifdef WITH_WEB
web.stop();
#endif
state = State::STOPPED;
}
void SuperNode::run() {
int ret;
while (state == State::STARTED) {
task.wait();
ret = periodic();
if (ret)
state = State::STOPPING;
}
}
SuperNode::~SuperNode() {
assert(state == State::INITIALIZED || state == State::PARSED ||
state == State::CHECKED || state == State::STOPPED ||
state == State::PREPARED);
for (auto *p : paths)
delete p;
for (auto *n : nodes)
delete n;
}
int SuperNode::periodic() {
int started = 0;
for (auto *p : paths) {
if (p->getState() == State::STARTED) {
started++;
#ifdef WITH_HOOKS
p->hooks.periodic();
#endif // WITH_HOOKS
}
}
for (auto *n : nodes) {
if (n->getState() == State::STARTED) {
#ifdef WITH_HOOKS
n->in.hooks.periodic();
n->out.hooks.periodic();
#endif // WITH_HOOKS
}
}
if (idleStop && state == State::STARTED && started == 0) {
logger->info("No more active paths. Stopping super-node");
return -1;
}
return 0;
}
#ifdef WITH_GRAPHVIZ
static void set_attr(void *ptr, const std::string &key,
const std::string &value, bool html = false) {
Agraph_t *g = agraphof(ptr);
char *d = (char *)"";
char *k = (char *)key.c_str();
char *v = (char *)value.c_str();
char *vd = html ? agstrdup_html(g, v) : agstrdup(g, v);
agsafeset(ptr, k, vd, d);
}
graph_t *SuperNode::getGraph() {
Agraph_t *g;
Agnode_t *m;
g = agopen((char *)"g", Agdirected, 0);
std::unordered_map<Node *, Agnode_t *> nodeMap;
for (auto *n : nodes) {
nodeMap[n] = agnode(g, (char *)n->getNameShort().c_str(), 1);
set_attr(nodeMap[n], "shape", "ellipse");
set_attr(nodeMap[n], "tooltip",
fmt::format("type={}, uuid={}", n->getFactory()->getName(),
uuid::toString(n->getUuid()).c_str()));
// set_attr(nodeMap[n], "fixedsize", "true");
// set_attr(nodeMap[n], "width", "0.15");
// set_attr(nodeMap[n], "height", "0.15");
}
unsigned i = 0;
for (auto *p : paths) {
auto name = fmt::format("path_{}", i++);
m = agnode(g, (char *)name.c_str(), 1);
set_attr(m, "shape", "box");
set_attr(m, "tooltip",
fmt::format("uuid={}", uuid::toString(p->getUuid()).c_str()));
for (auto ps : p->sources)
agedge(g, nodeMap[ps->getNode()], m, nullptr, 1);
for (auto pd : p->destinations)
agedge(g, m, nodeMap[pd->getNode()], nullptr, 1);
}
return g;
}
#endif // WITH_GRAPHVIZ
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