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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FOGIPC.h"
#include "mozilla/glean/fog_ffi_generated.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/MozPromise.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
using mozilla::dom::ContentParent;
using mozilla::ipc::ByteBuf;
using FlushFOGDataPromise = mozilla::dom::ContentParent::FlushFOGDataPromise;
namespace mozilla {
namespace glean {
/**
* The parent process is asking you to flush your data ASAP.
*
* @param aResolver - The function you need to call with the bincoded,
* serialized payload that the Rust impl hands you.
*/
void FlushFOGData(std::function<void(ipc::ByteBuf&&)>&& aResolver) {
ByteBuf buf;
uint32_t ipcBufferSize = impl::fog_serialize_ipc_buf();
bool ok = buf.Allocate(ipcBufferSize);
if (!ok) {
return;
}
uint32_t writtenLen = impl::fog_give_ipc_buf(buf.mData, buf.mLen);
if (writtenLen != ipcBufferSize) {
return;
}
aResolver(std::move(buf));
}
/**
* Called by FOG on the parent process when it wants to flush all its
* children's data.
* @param aResolver - The function that'll be called with the results.
*/
void FlushAllChildData(
std::function<void(const nsTArray<ipc::ByteBuf>&&)>&& aResolver) {
nsTArray<ContentParent*> parents;
ContentParent::GetAll(parents);
if (parents.Length() == 0) {
nsTArray<ipc::ByteBuf> results;
aResolver(std::move(results));
return;
}
nsTArray<RefPtr<FlushFOGDataPromise>> promises;
for (auto parent : parents) {
promises.EmplaceBack(parent->SendFlushFOGData());
}
// TODO: Don't throw away resolved data if some of the promises reject.
// (not sure how, but it'll mean not using ::All... maybe a custom copy of
// AllPromiseHolder? Might be impossible outside MozPromise.h)
FlushFOGDataPromise::All(GetCurrentSerialEventTarget(), promises)
->Then(GetCurrentSerialEventTarget(), __func__,
[&aResolver](
FlushFOGDataPromise::AllPromiseType::ResolveOrRejectValue&&
aValue) {
if (aValue.IsResolve()) {
aResolver(std::move(aValue.ResolveValue()));
} else {
nsTArray<ipc::ByteBuf> results;
aResolver(std::move(results));
}
});
}
/**
* A child process has sent you this buf as a treat.
* @param buf - a bincoded serialized payload that the Rust impl understands.
*/
void FOGData(ipc::ByteBuf&& buf) { impl::fog_use_ipc_buf(buf.mData, buf.mLen); }
/**
* Called by FOG on a child process when it wants to send a buf to the parent.
* @param buf - a bincoded serialized payload that the Rust impl understands.
*/
void SendFOGData(ipc::ByteBuf&& buf) {
switch (XRE_GetProcessType()) {
case GeckoProcessType_Content:
mozilla::dom::ContentChild::GetSingleton()->SendFOGData(std::move(buf));
break;
default:
MOZ_ASSERT_UNREACHABLE("Unsuppored process type");
}
}
} // namespace glean
} // namespace mozilla
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