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// Copyright © 2015, 2016 Richard Kettlewell.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <config.h>
#include "Utils.h"
#include "EventLoop.h"
#include "Action.h"
#include <algorithm>
#include <stdexcept>
#include <cassert>
#include <cstdio>
#include <fnmatch.h>
void Action::done(EventLoop *, ActionList *) {
}
void ActionList::add(Action *a) {
if(actions.find(a->name) != actions.end())
throw std::logic_error("duplicate action " + a->name);
actions[a->name] = a;
}
void ActionList::go(bool wait_for_timeouts) {
D("go");
while(actions.size() > 0) {
trigger();
eventloop->wait(wait_for_timeouts);
}
}
void ActionList::trigger() {
D("trigger");
Action *chosen = nullptr;
for(auto it: actions) {
Action *a = it.second;
if(a->running
|| blocked_by_resource(a)
|| blocked_by_dependency(a))
continue;
if(failed_by_dependency(a)) {
cleanup(a, false, false);
return trigger();
}
if(chosen == nullptr
|| chosen->priority < a->priority)
chosen = a;
}
if(chosen) {
chosen->running = true;
for(std::string &r: chosen->resources)
resources.insert(r);
D("action %s starting", chosen->name.c_str());
chosen->go(eventloop, this);
// Repeat in case there are more
return trigger();
}
}
void ActionList::completed(Action *a, bool succeeded) {
cleanup(a, succeeded, true);
}
void ActionList::cleanup(Action *a, bool succeeded, bool ran) {
D("action %s %s", a->name.c_str(), succeeded ? "succeeded" : "failed");
auto it = actions.find(a->name);
if(it != actions.end()) {
assert(a == it->second);
if(ran) {
assert(a->running);
for(std::string &r: a->resources)
resources.erase(r);
a->running = false;
}
actions.erase(it);
status[a->name] = succeeded;
if(ran) {
a->done(eventloop, this);
trigger();
}
return;
}
throw std::logic_error("ActionList::cleanup");
}
bool ActionList::blocked_by_resource(const Action *a) {
for(auto &r: a->resources)
if(contains(resources, r)) {
D("action %s blocked by resource %s",
a->name.c_str(), r.c_str());
return true;
}
return false;
}
bool ActionList::failed_by_dependency(const Action *a) {
for(auto &p: a->predecessors) {
if(p.flags & ACTION_GLOB) {
for(auto it: status) {
if(fnmatch(p.name.c_str(),
it.first.c_str(),
FNM_PATHNAME) != FNM_NOMATCH
&& it.second == false) {
D("action %s depends on success of failed action %s as %s",
a->name.c_str(), it.first.c_str(), p.name.c_str());
return true;
}
}
} else {
auto d = status.find(p.name);
if(d != status.end() // P completed or failed
&& (p.flags & ACTION_SUCCEEDED) // A needs P to have succeeded
&& !d->second) { // P failed
D("action %s depends on success of failed action %s",
a->name.c_str(), p.name.c_str());
return true;
}
}
}
return false;
}
bool ActionList::blocked_by_dependency(const Action *a) {
for(auto &p: a->predecessors) {
if(find(p) != actions.end()) {
D("action %s blocked by dependency %s",
a->name.c_str(), p.name.c_str());
return true;
} else { // Sanity check
if(!(p.flags & ACTION_GLOB)) {
auto d = status.find(p.name);
if(d == status.end())
throw std::logic_error(a->name + " follows unknown action " + p.name);
}
}
}
return false;
}
std::map<std::string, Action *>::iterator ActionList::find(const ActionStatus &as) {
if(as.flags & ACTION_GLOB) {
auto it = actions.begin();
while(it != actions.end()
&& fnmatch(as.name.c_str(),
it->first.c_str(),
FNM_PATHNAME) == FNM_NOMATCH)
++it;
return it;
} else
return actions.find(as.name);
}
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