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// file : mod/mod-build-task.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <mod/mod-build-task.hxx>
#include <map>
#include <chrono>
#include <libbutl/utility.hxx> // compare_c_string
#include <libbutl/filesystem.hxx> // path_match()
#include <libbutl/manifest-parser.hxx>
#include <libbutl/manifest-serializer.hxx>
#include <libbbot/manifest.hxx>
#include <libbbot/build-config.hxx>
#include <odb/database.hxx>
#include <odb/transaction.hxx>
#include <web/module.hxx>
#include <libbrep/build.hxx>
#include <libbrep/build-odb.hxx>
#include <libbrep/package.hxx>
#include <libbrep/package-odb.hxx>
#include <mod/options.hxx>
using namespace std;
using namespace butl;
using namespace bbot;
using namespace brep::cli;
using namespace odb::core;
// While currently the user-defined copy constructor is not required (we don't
// need to deep copy nullptr's), it is a good idea to keep the placeholder
// ready for less trivial cases.
//
brep::build_task::
build_task (const build_task& r)
: database_module (r),
options_ (r.initialized_ ? r.options_ : nullptr)
{
}
void brep::build_task::
init (scanner& s)
{
MODULE_DIAG;
options_ = make_shared<options::build_task> (
s, unknown_mode::fail, unknown_mode::fail);
database_module::init (static_cast<options::package_db> (*options_),
options_->package_db_retry ());
if (options_->build_config_specified ())
database_module::init (static_cast<options::build> (*options_),
static_cast<options::build_db> (*options_),
options_->build_db_retry ());
if (options_->root ().empty ())
options_->root (dir_path ("/"));
}
bool brep::build_task::
handle (request& rq, response& rs)
{
MODULE_DIAG;
if (build_db_ == nullptr)
throw invalid_request (501, "not implemented");
params::build_task params;
try
{
name_value_scanner s (rq.parameters ());
params = params::build_task (s, unknown_mode::fail, unknown_mode::fail);
}
catch (const cli::exception& e)
{
throw invalid_request (400, e.what ());
}
task_request_manifest tqm;
try
{
size_t limit (options_->build_task_request_max_size ());
manifest_parser p (rq.content (limit, limit), "task_request_manifest");
tqm = task_request_manifest (p);
}
catch (const manifest_parsing& e)
{
throw invalid_request (400, e.what ());
}
task_response_manifest tsm;
// Map build configurations to machines that are capable of building them.
// The first matching machine is selected for each configuration. Also
// create the configuration name list for use in database queries.
//
struct config_machine
{
const build_config* config;
machine_header_manifest* machine;
};
using config_machines = map<const char*, config_machine, compare_c_string>;
cstrings cfg_names;
config_machines cfg_machines;
for (const auto& c: *build_conf_)
{
for (auto& m: tqm.machines)
{
if (path_match (c.machine_pattern, m.name) &&
cfg_machines.insert (
make_pair (c.name.c_str (), config_machine ({&c, &m}))).second)
cfg_names.push_back (c.name.c_str ());
}
}
// Go through packages until we find one that has no build configuration
// present in the database, or has the untested one, or in the testing state
// but expired (collectively called unbuilt). If such a package
// configuration is found then put it into the testing state, set the
// current timestamp and respond with the task for building this package
// configuration.
//
// While trying to find a non-built package configuration we will also
// collect the list of the tested package configurations which it's time to
// rebuilt. So if no unbuilt package is found, we will pickup one to
// rebuild. The rebuild preference is given in the following order: the
// greater force flag, the greater overall status, the lower timestamp.
//
if (!cfg_machines.empty ())
{
vector<shared_ptr<build>> rebuilds;
// Create the task response manifest. The package must have the internal
// repository loaded.
//
auto task = [this] (shared_ptr<build>&& b,
shared_ptr<package>&& p,
const config_machine& cm) -> task_response_manifest
{
uint64_t ts (
chrono::duration_cast<std::chrono::nanoseconds> (
b->timestamp.time_since_epoch ()).count ());
string session (b->package_name + '/' + b->package_version.string () +
'/' + b->configuration + '/' + to_string (ts));
string result_url (options_->host () + options_->root ().string () +
"?build-result");
lazy_shared_ptr<repository> r (p->internal_repository);
strings fp;
if (r->certificate)
fp.emplace_back (move (r->certificate->fingerprint));
task_manifest task (move (b->package_name),
move (b->package_version),
move (r->location),
move (fp),
cm.machine->name,
cm.config->target,
cm.config->vars);
// @@ We don't support challenge at the moment.
//
return task_response_manifest (move (session),
nullopt,
move (result_url),
move (task));
};
// Calculate the expiration time for package configurations being in the
// testing (build expiration) or the tested (rebuild expiration) state.
//
timestamp now (timestamp::clock::now ());
auto expiration = [&now] (size_t timeout) -> timestamp
{
return now - chrono::seconds (timeout);
};
auto expiration_ns = [&expiration] (size_t timeout) -> uint64_t
{
return chrono::duration_cast<chrono::nanoseconds> (
expiration (timeout).time_since_epoch ()).count ();
};
uint64_t build_expiration_ns (
expiration_ns (options_->build_result_timeout ()));
timestamp forced_rebuild_expiration (
expiration (options_->build_forced_rebuild_timeout ()));
timestamp normal_rebuild_expiration (
expiration (options_->build_normal_rebuild_timeout ()));
// Prepare the package version prepared query.
//
// Note that the number of packages can be large and so, in order not to
// hold locks for too long, we will restrict the number of packages being
// queried in a single transaction. To achieve this we will iterate through
// packages using the OFFSET/LIMIT pair and sort the query result.
//
// Note that this approach can result in missing some packages or
// iterating multiple times over some of them. However there is nothing
// harmful in that: updates are infrequent and missed packages will be
// picked up on the next request.
//
using pkg_query = query<package_version>;
using prep_pkg_query = prepared_query<package_version>;
size_t offset (0); // See the package version query.
// Skip external and stub packages.
//
pkg_query pq (pkg_query::package::internal_repository.is_not_null () &&
compare_version_ne (pkg_query::package::id.version,
wildcard_version,
false));
// Filter by repositories display names (if requested).
//
const vector<string>& rp (params.repository ());
if (!rp.empty ())
pq = pq &&
pkg_query::repository::display_name.in_range (rp.begin (), rp.end ());
// Specify the portion.
//
pq += "ORDER BY" +
pkg_query::package::id.name + "," +
pkg_query::package::id.version.epoch + "," +
pkg_query::package::id.version.canonical_upstream + "," +
pkg_query::package::id.version.canonical_release + "," +
pkg_query::package::id.version.revision +
"OFFSET" + pkg_query::_ref (offset) + "LIMIT 50";
connection_ptr pkg_conn (package_db_->connection ());
prep_pkg_query pkg_prep_query (
pkg_conn->prepare_query<package_version> (
"mod-build-task-package-version-query", pq));
// Prepare the build prepared query.
//
// Note that we can not query the database for configurations that a
// package was not built with, as the database contains only those package
// configurations that have already been acted upon (initially empty).
//
// This is why we query the database for package configurations that
// should not be built (in the tested state, or in the testing state and
// not expired). Having such a list we will select the first build
// configuration that is not in the list (if available) for the response.
//
using bld_query = query<build>;
using prep_bld_query = prepared_query<build>;
package_id id; // See the build query.
const auto& qv (bld_query::id.package.version);
bld_query bq (
bld_query::id.package.name == bld_query::_ref (id.name) &&
qv.epoch == bld_query::_ref (id.version.epoch) &&
qv.canonical_upstream ==
bld_query::_ref (id.version.canonical_upstream) &&
qv.canonical_release == bld_query::_ref (id.version.canonical_release) &&
qv.revision == bld_query::_ref (id.version.revision) &&
bld_query::id.configuration.in_range (cfg_names.begin (),
cfg_names.end ()) &&
(bld_query::state == "tested" ||
(bld_query::state == "testing" &&
bld_query::timestamp > build_expiration_ns)));
connection_ptr bld_conn (build_db_->connection ());
prep_bld_query bld_prep_query (
bld_conn->prepare_query<build> (
"mod-build-task-package-build-query", bq));
while (tsm.session.empty ())
{
// Start the package database transaction.
//
transaction pt (pkg_conn->begin ());
// Query package versions.
//
auto package_versions (pkg_prep_query.execute ());
// Bail out if there is nothing left.
//
if (package_versions.empty ())
{
pt.commit ();
break;
}
offset += package_versions.size ();
// Start the build database transaction.
//
{
transaction bt (bld_conn->begin (), false);
transaction::current (bt);
// Iterate over packages until we find one that needs building.
//
for (auto& pv: package_versions)
{
id = move (pv.id);
// Iterate through the package configurations and erase those that
// don't need building from the build configuration map. All those
// configurations that remained can be built. We will take the first
// one, if present.
//
// Also save the tested package configurations for which it's time
// to be rebuilt.
//
config_machines configs (cfg_machines); // Make a copy for this pkg.
auto pkg_builds (bld_prep_query.execute ());
for (auto i (pkg_builds.begin ()); i != pkg_builds.end (); ++i)
{
auto j (configs.find (i->id.configuration.c_str ()));
// Outdated configurations are already excluded with the database
// query.
//
assert (j != configs.end ());
configs.erase (j);
if (i->state == build_state::tested &&
i->timestamp <= (i->forced
? forced_rebuild_expiration
: normal_rebuild_expiration))
rebuilds.emplace_back (i.load ());
}
if (!configs.empty ())
{
config_machine& cm (configs.begin ()->second);
machine_header_manifest& mh (*cm.machine);
build_id bid (move (id), cm.config->name);
shared_ptr<build> b (build_db_->find<build> (bid));
// If build configuration doesn't exist then create the new one
// and persist. Otherwise put it into the testing state, refresh
// the timestamp and update.
//
if (b == nullptr)
{
b = make_shared<build> (move (bid.package.name),
move (pv.version),
move (bid.configuration),
mh.name,
move (mh.summary));
build_db_->persist (b);
}
else
{
// The package configuration can be in the testing or untested
// state, so the forced flag is false and the status is absent,
// unless in the testing state (in which case they may or may not
// be set/exist), and there are no results.
//
// Note that in the testing state the status can be present if
// the rebuild task have been issued. In both cases we keep the
// status intact to be able to compare it with the final one in
// the result request handling in order to decide if to send the
// notification email. The same is true for the forced flag. We
// just assert that if the force flag is set, then the status
// exists.
//
// Load the section to assert the above statement.
//
build_db_->load (*b, b->results_section);
assert (b->state != build_state::tested &&
((!b->forced && !b->status) ||
(b->state == build_state::testing &&
(!b->forced || b->status))) &&
b->results.empty ());
b->state = build_state::testing;
b->machine = mh.name;
b->machine_summary = move (mh.summary);
b->timestamp = timestamp::clock::now ();
build_db_->update (b);
}
// Finally, prepare the task response manifest.
//
// Switch to the package database transaction to load the package.
//
transaction::current (pt);
shared_ptr<package> p (package_db_->load<package> (b->id.package));
p->internal_repository.load ();
// Switch back to the build database transaction.
//
transaction::current (bt);
tsm = task (move (b), move (p), cm);
}
// If the task response manifest is prepared, then bail out from the
// package loop, commit transactions and respond.
//
if (!tsm.session.empty ())
break;
}
bt.commit (); // Commit the build database transaction.
}
transaction::current (pt); // Switch to the package database transaction.
pt.commit ();
}
// If we don't have an unbuilt package, then let's see if we have a
// package to rebuild.
//
if (tsm.session.empty () && !rebuilds.empty ())
{
// Sort the package configuration rebuild list with the following sort
// priority:
//
// 1: forced flag
// 2: overall status
// 3: timestamp (less is preferred)
//
auto cmp = [] (const shared_ptr<build>& x,
const shared_ptr<build>& y) -> bool
{
if (x->forced != y->forced)
return x->forced > y->forced; // Forced goes first.
assert (x->status && y->status); // Both tested.
if (x->status != y->status)
return x->status > y->status; // Larger status goes first.
return x->timestamp < y->timestamp; // Older goes first.
};
sort (rebuilds.begin (), rebuilds.end (), cmp);
// Pick the first package configuration from the ordered list.
//
// Note that the configurations may not match the required criteria
// anymore (as we have committed the database transactions that were
// used to collect this data) so we recheck. If we find one that matches
// then put it into the testing state, refresh the timestamp and
// update. Note that we don't amend the status and the force flag to
// have them available in the result request handling (see above).
//
for (auto& b: rebuilds)
{
try
{
transaction bt (build_db_->begin ());
b = build_db_->find<build> (b->id);
if (b != nullptr && b->state == build_state::tested &&
b->timestamp <= (b->forced
? forced_rebuild_expiration
: normal_rebuild_expiration))
{
auto i (cfg_machines.find (b->id.configuration.c_str ()));
// Only actual package configurations are loaded (see above).
//
assert (i != cfg_machines.end ());
const config_machine& cm (i->second);
const machine_header_manifest& mh (*cm.machine);
// Load the package (if still present).
//
transaction pt (package_db_->begin (), false);
transaction::current (pt);
shared_ptr<package> p (package_db_->find<package> (b->id.package));
if (p != nullptr)
p->internal_repository.load ();
// Commit the package database transaction and switch back to the
// build database transaction.
//
pt.commit ();
transaction::current (bt);
if (p != nullptr)
{
assert (b->status);
b->state = build_state::testing;
b->machine = mh.name;
// Can't move from, as may need it on the next iteration.
//
b->machine_summary = mh.summary;
// Mark the section as loaded, so results are updated.
//
b->results_section.load ();
b->results.clear ();
b->timestamp = timestamp::clock::now ();
build_db_->update (b);
tsm = task (move (b), move (p), cm);
}
}
bt.commit ();
}
catch (const odb::deadlock&) {} // Just try with the next rebuild.
// If the task response manifest is prepared, then bail out from the
// package configuration rebuilds loop and respond.
//
if (!tsm.session.empty ())
break;
}
}
}
// @@ Probably it would be a good idea to also send some cache control
// headers to avoid caching by HTTP proxies. That would require extension
// of the web::response interface.
//
manifest_serializer s (rs.content (200, "text/manifest;charset=utf-8"),
"task_response_manifest");
tsm.serialize (s);
return true;
}
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