mirror of
https://github.com/NixOS/nix.git
synced 2024-11-25 16:23:02 +00:00
Merge pull request #4834 from NixOS/generic-closure-function
Extract a generic `computeClosure` function
This commit is contained in:
Eelco Dolstra
GitHub
commit
af4ff644d5
@ -6,98 +6,73 @@
|
||||
#include "thread-pool.hh"
|
||||
#include "topo-sort.hh"
|
||||
#include "callback.hh"
|
||||
#include "closure.hh"
|
||||
|
||||
namespace nix {
|
||||
|
||||
|
||||
void Store::computeFSClosure(const StorePathSet & startPaths,
|
||||
StorePathSet & paths_, bool flipDirection, bool includeOutputs, bool includeDerivers)
|
||||
{
|
||||
struct State
|
||||
{
|
||||
size_t pending;
|
||||
StorePathSet & paths;
|
||||
std::exception_ptr exc;
|
||||
};
|
||||
std::function<std::set<StorePath>(const StorePath & path, std::future<ref<const ValidPathInfo>> &)> queryDeps;
|
||||
if (flipDirection)
|
||||
queryDeps = [&](const StorePath& path,
|
||||
std::future<ref<const ValidPathInfo>> & fut) {
|
||||
StorePathSet res;
|
||||
StorePathSet referrers;
|
||||
queryReferrers(path, referrers);
|
||||
for (auto& ref : referrers)
|
||||
if (ref != path)
|
||||
res.insert(ref);
|
||||
|
||||
Sync<State> state_(State{0, paths_, 0});
|
||||
if (includeOutputs)
|
||||
for (auto& i : queryValidDerivers(path))
|
||||
res.insert(i);
|
||||
|
||||
std::function<void(const StorePath &)> enqueue;
|
||||
if (includeDerivers && path.isDerivation())
|
||||
for (auto& i : queryDerivationOutputs(path))
|
||||
if (isValidPath(i) && queryPathInfo(i)->deriver == path)
|
||||
res.insert(i);
|
||||
return res;
|
||||
};
|
||||
else
|
||||
queryDeps = [&](const StorePath& path,
|
||||
std::future<ref<const ValidPathInfo>> & fut) {
|
||||
StorePathSet res;
|
||||
auto info = fut.get();
|
||||
for (auto& ref : info->references)
|
||||
if (ref != path)
|
||||
res.insert(ref);
|
||||
|
||||
std::condition_variable done;
|
||||
if (includeOutputs && path.isDerivation())
|
||||
for (auto& i : queryDerivationOutputs(path))
|
||||
if (isValidPath(i))
|
||||
res.insert(i);
|
||||
|
||||
enqueue = [&](const StorePath & path) -> void {
|
||||
{
|
||||
auto state(state_.lock());
|
||||
if (state->exc) return;
|
||||
if (!state->paths.insert(path).second) return;
|
||||
state->pending++;
|
||||
}
|
||||
if (includeDerivers && info->deriver && isValidPath(*info->deriver))
|
||||
res.insert(*info->deriver);
|
||||
return res;
|
||||
};
|
||||
|
||||
queryPathInfo(path, {[&](std::future<ref<const ValidPathInfo>> fut) {
|
||||
// FIXME: calls to isValidPath() should be async
|
||||
|
||||
try {
|
||||
auto info = fut.get();
|
||||
|
||||
if (flipDirection) {
|
||||
|
||||
StorePathSet referrers;
|
||||
queryReferrers(path, referrers);
|
||||
for (auto & ref : referrers)
|
||||
if (ref != path)
|
||||
enqueue(ref);
|
||||
|
||||
if (includeOutputs)
|
||||
for (auto & i : queryValidDerivers(path))
|
||||
enqueue(i);
|
||||
|
||||
if (includeDerivers && path.isDerivation())
|
||||
for (auto & i : queryDerivationOutputs(path))
|
||||
if (isValidPath(i) && queryPathInfo(i)->deriver == path)
|
||||
enqueue(i);
|
||||
|
||||
} else {
|
||||
|
||||
for (auto & ref : info->references)
|
||||
if (ref != path)
|
||||
enqueue(ref);
|
||||
|
||||
if (includeOutputs && path.isDerivation())
|
||||
for (auto & i : queryDerivationOutputs(path))
|
||||
if (isValidPath(i)) enqueue(i);
|
||||
|
||||
if (includeDerivers && info->deriver && isValidPath(*info->deriver))
|
||||
enqueue(*info->deriver);
|
||||
|
||||
}
|
||||
|
||||
{
|
||||
auto state(state_.lock());
|
||||
assert(state->pending);
|
||||
if (!--state->pending) done.notify_one();
|
||||
}
|
||||
|
||||
} catch (...) {
|
||||
auto state(state_.lock());
|
||||
if (!state->exc) state->exc = std::current_exception();
|
||||
assert(state->pending);
|
||||
if (!--state->pending) done.notify_one();
|
||||
};
|
||||
}});
|
||||
};
|
||||
|
||||
for (auto & startPath : startPaths)
|
||||
enqueue(startPath);
|
||||
|
||||
{
|
||||
auto state(state_.lock());
|
||||
while (state->pending) state.wait(done);
|
||||
if (state->exc) std::rethrow_exception(state->exc);
|
||||
}
|
||||
computeClosure<StorePath>(
|
||||
startPaths, paths_,
|
||||
[&](const StorePath& path,
|
||||
std::function<void(std::promise<std::set<StorePath>>&)>
|
||||
processEdges) {
|
||||
std::promise<std::set<StorePath>> promise;
|
||||
std::function<void(std::future<ref<const ValidPathInfo>>)>
|
||||
getDependencies =
|
||||
[&](std::future<ref<const ValidPathInfo>> fut) {
|
||||
try {
|
||||
promise.set_value(queryDeps(path, fut));
|
||||
} catch (...) {
|
||||
promise.set_exception(std::current_exception());
|
||||
}
|
||||
};
|
||||
queryPathInfo(path, getDependencies);
|
||||
processEdges(promise);
|
||||
});
|
||||
}
|
||||
|
||||
|
||||
void Store::computeFSClosure(const StorePath & startPath,
|
||||
StorePathSet & paths_, bool flipDirection, bool includeOutputs, bool includeDerivers)
|
||||
{
|
||||
|
||||
69
src/libutil/closure.hh
Normal file
69
src/libutil/closure.hh
Normal file
@ -0,0 +1,69 @@
|
||||
#include <set>
|
||||
#include <future>
|
||||
#include "sync.hh"
|
||||
|
||||
using std::set;
|
||||
|
||||
namespace nix {
|
||||
|
||||
template<typename T>
|
||||
using GetEdgesAsync = std::function<void(const T &, std::function<void(std::promise<set<T>> &)>)>;
|
||||
|
||||
template<typename T>
|
||||
void computeClosure(
|
||||
const set<T> startElts,
|
||||
set<T> & res,
|
||||
GetEdgesAsync<T> getEdgesAsync
|
||||
)
|
||||
{
|
||||
struct State
|
||||
{
|
||||
size_t pending;
|
||||
set<T> & res;
|
||||
std::exception_ptr exc;
|
||||
};
|
||||
|
||||
Sync<State> state_(State{0, res, 0});
|
||||
|
||||
std::function<void(const T &)> enqueue;
|
||||
|
||||
std::condition_variable done;
|
||||
|
||||
enqueue = [&](const T & current) -> void {
|
||||
{
|
||||
auto state(state_.lock());
|
||||
if (state->exc) return;
|
||||
if (!state->res.insert(current).second) return;
|
||||
state->pending++;
|
||||
}
|
||||
|
||||
getEdgesAsync(current, [&](std::promise<set<T>> & prom) {
|
||||
try {
|
||||
auto children = prom.get_future().get();
|
||||
for (auto & child : children)
|
||||
enqueue(child);
|
||||
{
|
||||
auto state(state_.lock());
|
||||
assert(state->pending);
|
||||
if (!--state->pending) done.notify_one();
|
||||
}
|
||||
} catch (...) {
|
||||
auto state(state_.lock());
|
||||
if (!state->exc) state->exc = std::current_exception();
|
||||
assert(state->pending);
|
||||
if (!--state->pending) done.notify_one();
|
||||
};
|
||||
});
|
||||
};
|
||||
|
||||
for (auto & startElt : startElts)
|
||||
enqueue(startElt);
|
||||
|
||||
{
|
||||
auto state(state_.lock());
|
||||
while (state->pending) state.wait(done);
|
||||
if (state->exc) std::rethrow_exception(state->exc);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
70
src/libutil/tests/closure.cc
Normal file
70
src/libutil/tests/closure.cc
Normal file
@ -0,0 +1,70 @@
|
||||
#include "closure.hh"
|
||||
#include <gtest/gtest.h>
|
||||
|
||||
namespace nix {
|
||||
|
||||
using namespace std;
|
||||
|
||||
map<string, set<string>> testGraph = {
|
||||
{ "A", { "B", "C", "G" } },
|
||||
{ "B", { "A" } }, // Loops back to A
|
||||
{ "C", { "F" } }, // Indirect reference
|
||||
{ "D", { "A" } }, // Not reachable, but has backreferences
|
||||
{ "E", {} }, // Just not reachable
|
||||
{ "F", {} },
|
||||
{ "G", { "G" } }, // Self reference
|
||||
};
|
||||
|
||||
TEST(closure, correctClosure) {
|
||||
set<string> aClosure;
|
||||
set<string> expectedClosure = {"A", "B", "C", "F", "G"};
|
||||
computeClosure<string>(
|
||||
{"A"},
|
||||
aClosure,
|
||||
[&](const string currentNode, function<void(promise<set<string>> &)> processEdges) {
|
||||
promise<set<string>> promisedNodes;
|
||||
promisedNodes.set_value(testGraph[currentNode]);
|
||||
processEdges(promisedNodes);
|
||||
}
|
||||
);
|
||||
|
||||
ASSERT_EQ(aClosure, expectedClosure);
|
||||
}
|
||||
|
||||
TEST(closure, properlyHandlesDirectExceptions) {
|
||||
struct TestExn {};
|
||||
set<string> aClosure;
|
||||
EXPECT_THROW(
|
||||
computeClosure<string>(
|
||||
{"A"},
|
||||
aClosure,
|
||||
[&](const string currentNode, function<void(promise<set<string>> &)> processEdges) {
|
||||
throw TestExn();
|
||||
}
|
||||
),
|
||||
TestExn
|
||||
);
|
||||
}
|
||||
|
||||
TEST(closure, properlyHandlesExceptionsInPromise) {
|
||||
struct TestExn {};
|
||||
set<string> aClosure;
|
||||
EXPECT_THROW(
|
||||
computeClosure<string>(
|
||||
{"A"},
|
||||
aClosure,
|
||||
[&](const string currentNode, function<void(promise<set<string>> &)> processEdges) {
|
||||
promise<set<string>> promise;
|
||||
try {
|
||||
throw TestExn();
|
||||
} catch (...) {
|
||||
promise.set_exception(std::current_exception());
|
||||
}
|
||||
processEdges(promise);
|
||||
}
|
||||
),
|
||||
TestExn
|
||||
);
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user