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/*
* Copyright 2018 Google
*
* Licensed 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 "Firestore/core/src/firebase/firestore/local/local_serializer.h"
#include <cstdlib>
#include <string>
#include <utility>
#include "Firestore/Protos/nanopb/firestore/local/maybe_document.nanopb.h"
#include "Firestore/Protos/nanopb/google/firestore/v1beta1/document.nanopb.h"
#include "Firestore/core/src/firebase/firestore/model/field_value.h"
#include "Firestore/core/src/firebase/firestore/model/no_document.h"
#include "Firestore/core/src/firebase/firestore/model/snapshot_version.h"
#include "Firestore/core/src/firebase/firestore/nanopb/tag.h"
#include "Firestore/core/src/firebase/firestore/util/hard_assert.h"
namespace firebase {
namespace firestore {
namespace local {
using firebase::firestore::model::ObjectValue;
using firebase::firestore::model::SnapshotVersion;
using firebase::firestore::nanopb::Reader;
using firebase::firestore::nanopb::Tag;
using firebase::firestore::nanopb::Writer;
using firebase::firestore::util::Status;
Status LocalSerializer::EncodeMaybeDocument(
const model::MaybeDocument& document,
std::vector<uint8_t>* out_bytes) const {
Writer writer = Writer::Wrap(out_bytes);
EncodeMaybeDocument(&writer, document);
return writer.status();
}
void LocalSerializer::EncodeMaybeDocument(
Writer* writer, const model::MaybeDocument& maybe_doc) const {
switch (maybe_doc.type()) {
case model::MaybeDocument::Type::Document:
writer->WriteTag(
{PB_WT_STRING, firestore_client_MaybeDocument_document_tag});
writer->WriteNestedMessage([&](Writer* writer) {
EncodeDocument(writer, static_cast<const model::Document&>(maybe_doc));
});
return;
case model::MaybeDocument::Type::NoDocument:
writer->WriteTag(
{PB_WT_STRING, firestore_client_MaybeDocument_no_document_tag});
writer->WriteNestedMessage([&](Writer* writer) {
EncodeNoDocument(writer,
static_cast<const model::NoDocument&>(maybe_doc));
});
return;
case model::MaybeDocument::Type::Unknown:
// TODO(rsgowman)
abort();
}
UNREACHABLE();
}
std::unique_ptr<model::MaybeDocument> LocalSerializer::DecodeMaybeDocument(
Reader* reader) const {
if (!reader->status().ok()) return nullptr;
std::unique_ptr<model::MaybeDocument> result;
while (reader->bytes_left()) {
Tag tag = reader->ReadTag();
if (!reader->status().ok()) return nullptr;
// Ensure the tag matches the wire type
switch (tag.field_number) {
case firestore_client_MaybeDocument_document_tag:
if (!reader->RequireWireType(PB_WT_STRING, tag)) return nullptr;
// TODO(rsgowman): If multiple 'document' values are found, we should
// merge them (rather than using the last one.)
result = reader->ReadNestedMessage<std::unique_ptr<model::Document>>(
[&](Reader* reader) -> std::unique_ptr<model::Document> {
return rpc_serializer_.DecodeDocument(reader);
});
break;
case firestore_client_MaybeDocument_no_document_tag:
if (!reader->RequireWireType(PB_WT_STRING, tag)) return nullptr;
// TODO(rsgowman): If multiple 'no_document' values are found, we should
// merge them (rather than using the last one.)
result = reader->ReadNestedMessage<std::unique_ptr<model::NoDocument>>(
[&](Reader* reader) { return DecodeNoDocument(reader); });
break;
default:
// Unknown tag. According to the proto spec, we need to ignore these.
reader->SkipField(tag);
}
}
if (!result) {
reader->set_status(Status(FirestoreErrorCode::DataLoss,
"Invalid MaybeDocument message: Neither "
"'no_document' nor 'document' fields set."));
}
return result;
}
void LocalSerializer::EncodeDocument(Writer* writer,
const model::Document& doc) const {
// Encode Document.name
writer->WriteTag({PB_WT_STRING, google_firestore_v1beta1_Document_name_tag});
writer->WriteString(rpc_serializer_.EncodeKey(doc.key()));
// Encode Document.fields (unless it's empty)
const ObjectValue& object_value = doc.data().object_value();
if (!object_value.internal_value.empty()) {
rpc_serializer_.EncodeObjectMap(
writer, object_value.internal_value,
google_firestore_v1beta1_Document_fields_tag,
google_firestore_v1beta1_Document_FieldsEntry_key_tag,
google_firestore_v1beta1_Document_FieldsEntry_value_tag);
}
// Encode Document.update_time
writer->WriteTag(
{PB_WT_STRING, google_firestore_v1beta1_Document_update_time_tag});
writer->WriteNestedMessage([&](Writer* writer) {
rpc_serializer_.EncodeVersion(writer, doc.version());
});
// Ignore Document.create_time. (We don't use this in our on-disk protos.)
}
void LocalSerializer::EncodeNoDocument(Writer* writer,
const model::NoDocument& no_doc) const {
// Encode NoDocument.name
writer->WriteTag({PB_WT_STRING, firestore_client_NoDocument_name_tag});
writer->WriteString(rpc_serializer_.EncodeKey(no_doc.key()));
// Encode NoDocument.read_time
writer->WriteTag({PB_WT_STRING, firestore_client_NoDocument_read_time_tag});
writer->WriteNestedMessage([&](Writer* writer) {
rpc_serializer_.EncodeVersion(writer, no_doc.version());
});
}
util::StatusOr<std::unique_ptr<model::MaybeDocument>>
LocalSerializer::DecodeMaybeDocument(const uint8_t* bytes,
size_t length) const {
Reader reader = Reader::Wrap(bytes, length);
std::unique_ptr<model::MaybeDocument> maybe_doc =
DecodeMaybeDocument(&reader);
if (reader.status().ok()) {
return std::move(maybe_doc);
} else {
return reader.status();
}
}
std::unique_ptr<model::NoDocument> LocalSerializer::DecodeNoDocument(
Reader* reader) const {
if (!reader->status().ok()) return nullptr;
std::string name;
SnapshotVersion version = SnapshotVersion::None();
while (reader->bytes_left()) {
Tag tag = reader->ReadTag();
if (!reader->status().ok()) return nullptr;
// Ensure the tag matches the wire type
switch (tag.field_number) {
case firestore_client_NoDocument_name_tag:
if (!reader->RequireWireType(PB_WT_STRING, tag)) return nullptr;
name = reader->ReadString();
break;
case firestore_client_NoDocument_read_time_tag:
if (!reader->RequireWireType(PB_WT_STRING, tag)) return nullptr;
version = SnapshotVersion{reader->ReadNestedMessage<Timestamp>(
rpc_serializer_.DecodeTimestamp)};
break;
default:
// Unknown tag. According to the proto spec, we need to ignore these.
reader->SkipField(tag);
break;
}
}
return absl::make_unique<model::NoDocument>(rpc_serializer_.DecodeKey(name),
version);
}
} // namespace local
} // namespace firestore
} // namespace firebase
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