| // 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 <span> |
| #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_status/status.h" |
| #include "pw_status/status_with_size.h" |
| |
| namespace pw::file { |
| |
| using Entry = FlatFileSystemService::Entry; |
| |
| Status FlatFileSystemService::EnumerateFile( |
| Entry& entry, pw::file::ListResponse::StreamEncoder& output_encoder) { |
| StatusWithSize sws = entry.Name(file_name_buffer_); |
| if (!sws.ok()) { |
| return sws.status(); |
| } |
| { |
| pw::file::Path::StreamEncoder encoder = output_encoder.GetPathsEncoder(); |
| |
| encoder.WritePath(reinterpret_cast<const char*>(file_name_buffer_.data()), |
| sws.size()); |
| encoder.WriteSizeBytes(entry.SizeBytes()); |
| encoder.WritePermissions(entry.Permissions()); |
| encoder.WriteFileId(entry.FileId()); |
| } |
| 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. |
| pw::file::ListResponse::MemoryEncoder encoder(writer.PayloadBuffer()); |
| 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); |
| return; |
| } |
| } |
| writer.Finish(OkStatus()); |
| } |
| |
| 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>(pw::file::ListRequest::Fields::PATH)) { |
| continue; |
| } |
| |
| std::string_view file_name_view; |
| if (!decoder.ReadString(&file_name_view).ok() || |
| file_name_view.length() == 0) { |
| writer.Finish(Status::DataLoss()); |
| return; |
| } |
| |
| // Find and enumerate the file requested. |
| Result<Entry*> result = FindFile(file_name_view); |
| if (!result.ok()) { |
| writer.Finish(result.status()); |
| return; |
| } |
| |
| pw::file::ListResponse::MemoryEncoder encoder(writer.PayloadBuffer()); |
| Status proto_encode_status = EnumerateFile(*result.value(), encoder); |
| if (!proto_encode_status.ok()) { |
| writer.Finish(proto_encode_status); |
| return; |
| } |
| |
| writer.Finish(writer.Write(encoder)); |
| return; |
| } |
| |
| // If no path was provided in the ListRequest, just enumerate everything. |
| EnumerateAllFiles(writer); |
| } |
| |
| StatusWithSize FlatFileSystemService::Delete(ConstByteSpan request, ByteSpan) { |
| protobuf::Decoder decoder(request); |
| while (decoder.Next().ok()) { |
| if (decoder.FieldNumber() != |
| static_cast<uint32_t>(pw::file::DeleteRequest::Fields::PATH)) { |
| continue; |
| } |
| |
| std::string_view file_name_view; |
| if (!decoder.ReadString(&file_name_view).ok()) { |
| return StatusWithSize(Status::DataLoss(), 0); |
| } |
| return StatusWithSize(FindAndDeleteFile(file_name_view), 0); |
| } |
| return StatusWithSize(Status::InvalidArgument(), 0); |
| } |
| |
| 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 |