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// Copyright 2021 The Pigweed Authors
//
// 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
//
// https://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.
#define PW_LOG_MODULE_NAME "FS"
#include "pw_file/flat_file_system.h"
#include <cstddef>
#include <cstdint>
#include <string_view>
#include "pw_assert/check.h"
#include "pw_bytes/span.h"
#include "pw_file/file.pwpb.h"
#include "pw_log/log.h"
#include "pw_protobuf/decoder.h"
#include "pw_protobuf/encoder.h"
#include "pw_protobuf/serialized_size.h"
#include "pw_rpc/raw/server_reader_writer.h"
#include "pw_span/span.h"
#include "pw_status/status.h"
#include "pw_status/status_with_size.h"
namespace pw::file {
using Entry = FlatFileSystemService::Entry;
Status FlatFileSystemService::EnumerateFile(
Entry& entry, pwpb::ListResponse::StreamEncoder& output_encoder) {
StatusWithSize sws = entry.Name(file_name_buffer_);
if (!sws.ok()) {
return sws.status();
}
{
pwpb::Path::StreamEncoder encoder = output_encoder.GetPathsEncoder();
encoder
.WritePath(reinterpret_cast<const char*>(file_name_buffer_.data()),
sws.size())
.IgnoreError();
encoder.WriteSizeBytes(entry.SizeBytes()).IgnoreError();
encoder.WritePermissions(entry.Permissions()).IgnoreError();
encoder.WriteFileId(entry.FileId()).IgnoreError();
}
return output_encoder.status();
}
void FlatFileSystemService::EnumerateAllFiles(RawServerWriter& writer) {
for (Entry* entry : entries_) {
PW_DCHECK_NOTNULL(entry);
// For now, don't try to pack entries.
pwpb::ListResponse::MemoryEncoder encoder(encoding_buffer_);
if (Status status = EnumerateFile(*entry, encoder); !status.ok()) {
if (status != Status::NotFound()) {
PW_LOG_ERROR("Failed to enumerate file (id: %u) with status %d",
static_cast<unsigned>(entry->FileId()),
static_cast<int>(status.code()));
}
continue;
}
Status write_status = writer.Write(encoder);
if (!write_status.ok()) {
writer.Finish(write_status)
.IgnoreError(); // TODO: b/242598609 - Handle Status properly
return;
}
}
writer.Finish(OkStatus())
.IgnoreError(); // TODO: b/242598609 - Handle Status properly
}
void FlatFileSystemService::List(ConstByteSpan request,
RawServerWriter& writer) {
protobuf::Decoder decoder(request);
// If a file name was provided, try and find and enumerate the file.
while (decoder.Next().ok()) {
if (decoder.FieldNumber() !=
static_cast<uint32_t>(pwpb::ListRequest::Fields::kPath)) {
continue;
}
std::string_view file_name_view;
if (!decoder.ReadString(&file_name_view).ok() || file_name_view.empty()) {
writer.Finish(Status::DataLoss())
.IgnoreError(); // TODO: b/242598609 - Handle Status properly
return;
}
// Find and enumerate the file requested.
Result<Entry*> result = FindFile(file_name_view);
if (!result.ok()) {
writer.Finish(result.status())
.IgnoreError(); // TODO: b/242598609 - Handle Status properly
return;
}
pwpb::ListResponse::MemoryEncoder encoder(encoding_buffer_);
Status proto_encode_status = EnumerateFile(*result.value(), encoder);
if (!proto_encode_status.ok()) {
writer.Finish(proto_encode_status)
.IgnoreError(); // TODO: b/242598609 - Handle Status properly
return;
}
writer.Finish(writer.Write(encoder))
.IgnoreError(); // TODO: b/242598609 - Handle Status properly
return;
}
// If no path was provided in the ListRequest, just enumerate everything.
EnumerateAllFiles(writer);
}
void FlatFileSystemService::Delete(ConstByteSpan request,
rpc::RawUnaryResponder& responder) {
protobuf::Decoder decoder(request);
while (decoder.Next().ok()) {
if (decoder.FieldNumber() !=
static_cast<uint32_t>(pwpb::DeleteRequest::Fields::kPath)) {
continue;
}
std::string_view file_name_view;
if (!decoder.ReadString(&file_name_view).ok()) {
responder.Finish({}, Status::DataLoss()).IgnoreError();
return;
}
responder.Finish({}, FindAndDeleteFile(file_name_view)).IgnoreError();
return;
}
responder.Finish({}, Status::InvalidArgument()).IgnoreError();
}
Result<Entry*> FlatFileSystemService::FindFile(std::string_view file_name) {
Status search_status;
for (Entry* entry : entries_) {
PW_DCHECK_NOTNULL(entry);
StatusWithSize sws = entry->Name(file_name_buffer_);
// If there not an exact file name length match, don't try and check against
// a prefix.
if (!sws.ok() || file_name.length() != sws.size()) {
if (sws.status() != Status::NotFound()) {
PW_LOG_ERROR("Failed to read file name (id: %u) with status %d",
static_cast<unsigned>(entry->FileId()),
static_cast<int>(sws.status().code()));
}
continue;
}
if (memcmp(file_name.data(), file_name_buffer_.data(), file_name.size()) ==
0) {
return entry;
}
}
search_status.Update(Status::NotFound());
return search_status;
}
Status FlatFileSystemService::FindAndDeleteFile(std::string_view file_name) {
Result<Entry*> result = FindFile(file_name);
if (!result.ok()) {
return result.status();
}
return result.value()->Delete();
}
} // namespace pw::file
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