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/* Nodes.
*
* 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 <regex>
#include <openssl/md5.h>
#ifdef __linux__
extern "C" {
#include <sys/socket.h>
#include <sys/types.h>
}
#endif
#include <villas/colors.hpp>
#include <villas/hook.hpp>
#include <villas/hook_list.hpp>
#include <villas/mapping.hpp>
#include <villas/node.hpp>
#include <villas/node/config.hpp>
#include <villas/node/memory.hpp>
#include <villas/node_list.hpp>
#include <villas/path.hpp>
#include <villas/sample.hpp>
#include <villas/signal.hpp>
#include <villas/timing.hpp>
#include <villas/utils.hpp>
#include <villas/uuid.hpp>
#ifdef WITH_NETEM
#include <villas/kernel/if.hpp>
#include <villas/kernel/nl.hpp>
#include <villas/kernel/tc.hpp>
#include <villas/kernel/tc_netem.hpp>
#endif // WITH_NETEM
using namespace villas;
using namespace villas::node;
using namespace villas::utils;
Node::Node(const uuid_t &id, const std::string &name)
: logger(Log::get("node")), sequence_init(0), sequence(0),
in(NodeDirection::Direction::IN, this),
out(NodeDirection::Direction::OUT, this), configPath(),
#ifdef __linux__
fwmark(-1),
#endif // __linux__
#ifdef WITH_NETEM
tc_qdisc(nullptr), tc_classifier(nullptr),
#endif // WITH_NETEM
state(State::INITIALIZED), enabled(true), config(nullptr),
name_short(name), affinity(-1), // all cores
factory(nullptr) {
if (uuid_is_null(id)) {
uuid_generate_random(uuid);
} else {
uuid_copy(uuid, id);
}
if (!name_short.empty()) {
name_long = fmt::format(CLR_RED("{}"), name_short);
} else if (name_short.empty()) {
name_short = "<none>";
name_long = CLR_RED("<none>");
}
}
Node::~Node() {
#ifdef WITH_NETEM
rtnl_qdisc_put(tc_qdisc);
rtnl_cls_put(tc_classifier);
#endif // WITH_NETEM
// Internal loopback nodes have no factory
// Only attempt removal for factories of other node-types.
if (factory != nullptr)
factory->instances.remove(this);
}
int Node::prepare() {
int ret;
ret = in.prepare();
if (ret)
return ret;
ret = out.prepare();
if (ret)
return ret;
state = State::PREPARED;
return 0;
}
int Node::parse(json_t *json) {
assert(state == State::INITIALIZED || state == State::PARSED ||
state == State::CHECKED);
int ret, en = enabled, init_seq = -1;
json_error_t err;
json_t *json_netem = nullptr;
ret = json_unpack_ex(json, &err, 0, "{ s?: b, s?: i }", "enabled", &en,
"initial_sequenceno", &init_seq);
if (ret)
return ret;
if (init_seq >= 0)
sequence_init = init_seq;
#ifdef __linux__
ret = json_unpack_ex(json, &err, 0, "{ s?: { s?: o, s?: i } }", "out",
"netem", &json_netem, "fwmark", &fwmark);
if (ret)
return ret;
#endif // __linux__
enabled = en;
if (json_netem) {
#ifdef WITH_NETEM
int enabled = 1;
ret = json_unpack_ex(json_netem, &err, 0, "{ s?: b }", "enabled", &enabled);
if (ret)
return ret;
if (enabled)
kernel::tc::netem_parse(&tc_qdisc, json_netem);
else
tc_qdisc = nullptr;
#endif // WITH_NETEM
}
struct {
const char *str;
struct NodeDirection *dir;
} dirs[] = {{"in", &in}, {"out", &out}};
const char *fields[] = {"signals", "builtin", "vectorize", "hooks"};
for (unsigned j = 0; j < ARRAY_LEN(dirs); j++) {
json_t *json_dir = json_object_get(json, dirs[j].str);
// Skip if direction is unused
if (!json_dir) {
json_dir = json_pack("{ s: b }", "enabled", 0);
}
// Copy missing fields from main node config to direction config
for (unsigned i = 0; i < ARRAY_LEN(fields); i++) {
json_t *json_field_dir = json_object_get(json_dir, fields[i]);
json_t *json_field_node = json_object_get(json, fields[i]);
if (json_field_node && !json_field_dir)
json_object_set(json_dir, fields[i], json_field_node);
}
ret = dirs[j].dir->parse(json_dir);
if (ret)
return ret;
}
config = json;
return 0;
}
int Node::check() {
assert(state == State::CHECKED || state == State::PARSED ||
state == State::INITIALIZED);
in.check();
out.check();
state = State::CHECKED;
return 0;
}
int Node::start() {
int ret;
assert(state == State::PREPARED);
logger->info("Starting node {}", getNameFull());
ret = in.start();
if (ret)
return ret;
ret = out.start();
if (ret)
return ret;
#ifdef __linux__
// Set fwmark for outgoing packets if netem is enabled for this node
if (fwmark >= 0) {
for (int fd : getNetemFDs()) {
ret = setsockopt(fd, SOL_SOCKET, SO_MARK, &fwmark, sizeof(fwmark));
if (ret)
throw RuntimeError("Failed to set FW mark for outgoing packets");
else
logger->debug("Set FW mark for socket (sd={}) to {}", fd, fwmark);
}
}
#endif // __linux__
state = State::STARTED;
sequence = sequence_init;
return 0;
}
int Node::stop() {
int ret;
if (state != State::STOPPING && state != State::STARTED &&
state != State::CONNECTED && state != State::PENDING_CONNECT)
return 0;
logger->info("Stopping node");
setState(State::STOPPING);
ret = in.stop();
if (ret)
return ret;
ret = out.stop();
if (ret)
return ret;
return 0;
}
int Node::restart() {
int ret;
assert(state == State::STARTED);
logger->info("Restarting node");
ret = stop();
if (ret)
return ret;
ret = start();
if (ret)
return ret;
return 0;
}
int Node::read(struct Sample *smps[], unsigned cnt) {
int toread, readd, nread = 0;
unsigned vect;
if (state == State::PAUSED || state == State::PENDING_CONNECT)
return 0;
else if (state != State::STARTED && state != State::CONNECTED)
return -1;
vect = factory->getVectorize();
if (!vect)
vect = cnt;
while (cnt - nread > 0) {
toread = MIN(cnt - nread, vect);
readd = _read(&smps[nread], toread);
if (readd < 0)
return readd;
nread += readd;
}
#ifdef WITH_HOOKS
// Run read hooks
int rread = in.hooks.process(smps, nread);
if (rread < 0)
return rread;
int skipped = nread - rread;
if (skipped > 0) {
if (stats != nullptr)
stats->update(Stats::Metric::SMPS_SKIPPED, skipped);
logger->trace("Received {} samples of which {} have been skipped", nread,
skipped);
} else
logger->trace("Received {} samples", nread);
return rread;
#else
logger->trace("Received {} samples", nread);
return nread;
#endif // WITH_HOOKS
}
int Node::write(struct Sample *smps[], unsigned cnt) {
int tosend, sent, nsent = 0;
unsigned vect;
if (state == State::PAUSED || state == State::PENDING_CONNECT)
return 0;
else if (state != State::STARTED && state != State::CONNECTED)
return -1;
#ifdef WITH_HOOKS
// Run write hooks
int hook_cnt = out.hooks.process(smps, cnt);
if (hook_cnt <= 0)
return hook_cnt;
cnt = hook_cnt;
#endif // WITH_HOOKS
vect = getFactory()->getVectorize();
if (!vect)
vect = cnt;
while (cnt > static_cast<unsigned>(nsent)) {
tosend = MIN(cnt - nsent, vect);
sent = _write(&smps[nsent], tosend);
if (sent < 0)
return sent;
nsent += sent;
logger->trace("Sent {} samples", sent);
}
return nsent;
}
const std::string &Node::getNameFull() {
if (name_full.empty()) {
auto is1 = getInputSignals(false) ? getInputSignals(false)->size() : 0;
auto is2 = getInputSignals(true) ? getInputSignals(true)->size() : 0;
name_full = fmt::format("{}: uuid={}, #in.signals={}/{}, #in.hooks={}, "
"#out.hooks={}, in.vectorize={}, out.vectorize={}",
getName(), uuid::toString(uuid).c_str(), is1, is2,
in.hooks.size(), out.hooks.size(), in.vectorize,
out.vectorize);
#ifdef WITH_NETEM
name_full += fmt::format(", out.netem={}", tc_qdisc ? "yes" : "no");
if (tc_qdisc)
name_full += fmt::format(", fwmark={}", fwmark);
#endif // WITH_NETEM
if (out.path) {
name_full += fmt::format(
", #out.signals={}/{}",
getOutputSignals(false) ? getOutputSignals(false)->size() : 0,
getOutputSignals() ? getOutputSignals()->size() : 0);
name_full += fmt::format(", out.path={}", out.path->toString());
}
// Append node-type specific details
auto details = getDetails();
if (!details.empty())
name_full += fmt::format(", {}", details);
}
return name_full;
}
SignalList::Ptr Node::getInputSignals(bool after_hooks) const {
return in.getSignals(after_hooks);
}
SignalList::Ptr Node::getOutputSignals(bool after_hooks) const {
if (out.path)
return out.path->getOutputSignals();
return nullptr;
}
unsigned Node::getInputSignalsMaxCount() const {
return in.getSignalsMaxCount();
}
unsigned Node::getOutputSignalsMaxCount() const {
if (out.path)
return out.path->getOutputSignalsMaxCount();
return 0;
}
bool Node::isValidName(const std::string &name) {
std::regex re(RE_NODE_NAME);
return std::regex_match(name, re);
}
json_t *Node::toJson() const {
json_t *json_node;
json_t *json_signals_in = nullptr;
json_t *json_signals_out = nullptr;
json_signals_in = getInputSignals()->toJson();
auto output_signals = getOutputSignals();
if (output_signals)
json_signals_out = output_signals->toJson();
json_node = json_pack(
"{ s: s, s: s, s: s, s: i, s: { s: i, s: o? }, s: { s: i, s: o? } }",
"name", getNameShort().c_str(), "uuid", uuid::toString(uuid).c_str(),
"state", stateToString(state).c_str(), "affinity", affinity, "in",
"vectorize", in.vectorize, "signals", json_signals_in, "out", "vectorize",
out.vectorize, "signals", json_signals_out);
if (stats)
json_object_set_new(json_node, "stats", stats->toJson());
auto *status = _readStatus();
if (status)
json_object_set_new(json_node, "status", status);
/* Add all additional fields of node here.
* This can be used for metadata */
json_object_update(json_node, config);
return json_node;
}
void Node::swapSignals() { SWAP(in.signals, out.signals); }
Node *NodeFactory::make(json_t *json, const uuid_t &id,
const std::string &name) {
int ret;
std::string type;
Node *n;
if (!json_is_object(json))
throw ConfigError(json, "node-config-node",
"Node configuration must be an object");
json_t *json_type = json_object_get(json, "type");
type = json_string_value(json_type);
n = NodeFactory::make(type, id, name);
if (!n)
return nullptr;
ret = n->parse(json);
if (ret) {
delete n;
return nullptr;
}
return n;
}
Node *NodeFactory::make(const std::string &type, const uuid_t &id,
const std::string &name) {
NodeFactory *nf = plugin::registry->lookup<NodeFactory>(type);
if (!nf)
throw RuntimeError("Unknown node-type: {}", type);
return nf->make(id, name);
}
int NodeFactory::start(SuperNode *sn) {
getLogger()->info("Initialized node type which is used by {} nodes",
instances.size());
state = State::STARTED;
return 0;
}
int NodeFactory::stop() {
getLogger()->info("De-initialized node type");
state = State::STOPPED;
return 0;
}
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