// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "runtime/thread_context.h"

#include <mutex>

#include "common/signal_handler.h"

#include "runtime/query_context.h"

#include "runtime/runtime_state.h"

namespace doris {

class MemTracker;

bthread_key_t btls_key;

namespace {

void thread_context_deleter(void* data) {

    delete static_cast<ThreadContext*>(data);

}

} // namespace

void init_thread_context_btls_key() {

    static std::once_flag btls_key_once;

    std::call_once(btls_key_once,

                   []() { CHECK_EQ(0, bthread_key_create(&btls_key, thread_context_deleter)); });

}

void AttachTask::init(const std::shared_ptr<ResourceContext>& rc) {

    // Validate the ResourceContext chain before mutating any thread-local

    // or signal state. If any link is null we throw immediately, so the

    // caller's stack-unwind sees a clean state (no thread-local handle is

    // acquired and no signal task id is set). Without these the previous

    // code would silently propagate a null mem_tracker into

    // ThreadMemTrackerMgr and crash much later inside the allocator.

    if (UNLIKELY(rc == nullptr)) {

        throw Exception(

                Status::FatalError("AttachTask::init: rc is null. signal_query_id={:x}-{:x}",

                                   signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(rc->memory_context() == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask::init: rc->memory_context() is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(rc->memory_context()->mem_tracker() == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask::init: rc->memory_context()->mem_tracker() is null. "

                "ResourceContext was created but set_mem_tracker has not been called yet "

                "(likely a half-initialized QueryContext used before _init_query_mem_tracker). "

                "signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(rc->task_controller() == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask::init: rc->task_controller() is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    ThreadLocalHandle::create_thread_local_if_not_exits();

    signal::set_signal_task_id(rc->task_controller()->task_id());

    thread_context()->attach_task(rc);

}

AttachTask::AttachTask(const std::shared_ptr<ResourceContext>& rc) {

    init(rc);

}

AttachTask::AttachTask(const std::shared_ptr<MemTrackerLimiter>& mem_tracker) {

    // if parameter is `orphan_mem_tracker`, if you do not switch thraed mem tracker afterwards,

    // alloc or free memory from Allocator will fail DCHECK. unless you know for sure that

    // the thread will not alloc or free memory from Allocator later.

    //

    // Validate before constructing the ResourceContext: MemoryContext::set_mem_tracker()

    // immediately dereferences mem_tracker->limit(), so a null shared_ptr would

    // crash there before reaching init()'s diagnostics.

    if (UNLIKELY(mem_tracker == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask(MemTrackerLimiter): mem_tracker is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    std::shared_ptr<ResourceContext> rc = ResourceContext::create_shared();

    rc->memory_context()->set_mem_tracker(mem_tracker);

    init(rc);

}

AttachTask::AttachTask(RuntimeState* runtime_state) {

    // Walk the chain `runtime_state -> get_query_ctx() -> resource_ctx()`

    // step by step so that an unexpected null pinpoints exactly which link

    // failed instead of crashing with a generic NPE inside attach_task() or

    // even later inside the allocator.

    if (UNLIKELY(runtime_state == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask(RuntimeState*): runtime_state is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(runtime_state->get_query_ctx() == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask(RuntimeState*): runtime_state->get_query_ctx() is null. "

                "signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(runtime_state->get_query_ctx()->resource_ctx() == nullptr)) {

        throw Exception(

                Status::FatalError("AttachTask(RuntimeState*): query_ctx->resource_ctx() is null. "

                                   "signal_query_id={:x}-{:x}",

                                   signal::query_id_hi, signal::query_id_lo));

    }

    signal::set_signal_is_nereids(runtime_state->is_nereids());

    init(runtime_state->get_query_ctx()->resource_ctx());

}

AttachTask::AttachTask(QueryContext* query_ctx) {

    if (UNLIKELY(query_ctx == nullptr)) {

        throw Exception(Status::FatalError(

                "AttachTask(QueryContext*): query_ctx is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    init(query_ctx->resource_ctx());

}

AttachTask::~AttachTask() {

    signal::set_signal_task_id(TUniqueId());

    thread_context()->detach_task();

    ThreadLocalHandle::del_thread_local_if_count_is_zero();

}

SwitchResourceContext::SwitchResourceContext(const std::shared_ptr<ResourceContext>& rc) {

    DCHECK(rc != nullptr);

    // Validate the chain before mutating any thread-local or signal state,

    // symmetric to AttachTask::init(). Throwing after the thread-local

    // handle was acquired or the signal task id was set would skip this

    // object's destructor (because construction failed) and leak the

    // handle / leave a stale signal task id behind.

    if (UNLIKELY(rc == nullptr)) {

        throw Exception(

                Status::FatalError("SwitchResourceContext: rc is null. signal_query_id={:x}-{:x}",

                                   signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(rc->memory_context() == nullptr)) {

        throw Exception(Status::FatalError(

                "SwitchResourceContext: rc->memory_context() is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(rc->memory_context()->mem_tracker() == nullptr)) {

        throw Exception(Status::FatalError(

                "SwitchResourceContext: rc->memory_context()->mem_tracker() is null. "

                "ResourceContext was switched in before _init_query_mem_tracker ran. "

                "signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    if (UNLIKELY(rc->task_controller() == nullptr)) {

        throw Exception(Status::FatalError(

                "SwitchResourceContext: rc->task_controller() is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    doris::ThreadLocalHandle::create_thread_local_if_not_exits();

    DCHECK(thread_context()->is_attach_task());

    old_resource_ctx_ = thread_context()->resource_ctx();

    if (rc != old_resource_ctx_) {

        signal::set_signal_task_id(rc->task_controller()->task_id());

        thread_context()->resource_ctx_ = rc;

        thread_context()->thread_mem_tracker_mgr->attach_limiter_tracker(

                rc->memory_context()->mem_tracker(), rc->workload_group());

    }

}

SwitchResourceContext::~SwitchResourceContext() {

    if (old_resource_ctx_ != thread_context()->resource_ctx()) {

        DCHECK(old_resource_ctx_ != nullptr);

        signal::set_signal_task_id(old_resource_ctx_->task_controller()->task_id());

        thread_context()->resource_ctx_ = old_resource_ctx_;

        thread_context()->thread_mem_tracker_mgr->detach_limiter_tracker();

    }

    doris::ThreadLocalHandle::del_thread_local_if_count_is_zero();

}

SwitchThreadMemTrackerLimiter::SwitchThreadMemTrackerLimiter(

        const std::shared_ptr<doris::MemTrackerLimiter>& mem_tracker) {

    DCHECK(mem_tracker);

    // Third entry point that calls attach_limiter_tracker(). Without this

    // null guard a null mem_tracker silently propagates and the next

    // allocation on this thread would NPE deep inside the allocator. Throw

    // before acquiring the thread-local handle / doing any side effect so

    // the destructor (which is noexcept) never runs in a dirty state.

    if (UNLIKELY(mem_tracker == nullptr)) {

        throw Exception(Status::FatalError(

                "SwitchThreadMemTrackerLimiter: mem_tracker is null. signal_query_id={:x}-{:x}",

                signal::query_id_hi, signal::query_id_lo));

    }

    doris::ThreadLocalHandle::create_thread_local_if_not_exits();

    if (mem_tracker != thread_context()->thread_mem_tracker_mgr->limiter_mem_tracker_sptr()) {

        thread_context()->thread_mem_tracker_mgr->attach_limiter_tracker(mem_tracker);

        is_switched_ = true;

    }

}

SwitchThreadMemTrackerLimiter::~SwitchThreadMemTrackerLimiter() {

    if (is_switched_) {

        thread_context()->thread_mem_tracker_mgr->detach_limiter_tracker();

    }

    doris::ThreadLocalHandle::del_thread_local_if_count_is_zero();

}

AddThreadMemTrackerConsumer::AddThreadMemTrackerConsumer(MemTracker* mem_tracker) {

    ThreadLocalHandle::create_thread_local_if_not_exits();

    if (mem_tracker) {

        _need_pop = thread_context()->thread_mem_tracker_mgr->push_consumer_tracker(mem_tracker);

    }

}

AddThreadMemTrackerConsumer::AddThreadMemTrackerConsumer(

        const std::shared_ptr<MemTracker>& mem_tracker)

        : _mem_tracker(mem_tracker) {

    ThreadLocalHandle::create_thread_local_if_not_exits();

    if (_mem_tracker) {

        _need_pop =

                thread_context()->thread_mem_tracker_mgr->push_consumer_tracker(_mem_tracker.get());

    }

}

AddThreadMemTrackerConsumer::~AddThreadMemTrackerConsumer() {

    if (_need_pop) {

        thread_context()->thread_mem_tracker_mgr->pop_consumer_tracker();

    }

    ThreadLocalHandle::del_thread_local_if_count_is_zero();

}

} // namespace doris