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Merge "init: remove non-protobuf single persistent property file" am: 61578ab50b

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am: aceda86059

Change-Id: Ie413aa25233db86ad236ece01f961103d133cb60
This commit is contained in:
Tom Cherry 2017-09-27 20:41:13 +00:00 committed by android-build-merger
commit 27c56990ce
1 changed files with 9 additions and 101 deletions
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110
init/persistent_properties.cpp
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@ -43,7 +43,6 @@ std::string persistent_property_filename = "/data/property/persistent_properties
namespace {
constexpr const uint32_t kMagic = 0x8495E0B4;
constexpr const char kLegacyPersistentPropertyDir[] = "/data/property";
void AddPersistentProperty(const std::string& name, const std::string& value,
@ -140,85 +139,6 @@ PersistentProperties LoadPersistentPropertiesFromMemory() {
return persistent_properties;
}
class PersistentPropertyFileParser {
public:
PersistentPropertyFileParser(const std::string& contents) : contents_(contents), position_(0) {}
Result<PersistentProperties> Parse();
private:
Result<std::string> ReadString();
Result<uint32_t> ReadUint32();
const std::string& contents_;
size_t position_;
};
Result<PersistentProperties> PersistentPropertyFileParser::Parse() {
if (auto magic = ReadUint32(); magic) {
if (*magic != kMagic) {
return Error() << "Magic value '0x" << std::hex << *magic
<< "' does not match expected value '0x" << kMagic << "'";
}
} else {
return Error() << "Could not read magic value: " << magic.error();
}
if (auto version = ReadUint32(); version) {
if (*version != 1) {
return Error() << "Version '" << *version
<< "' does not match any compatible version: (1)";
}
} else {
return Error() << "Could not read version: " << version.error();
}
auto num_properties = ReadUint32();
if (!num_properties) {
return Error() << "Could not read num_properties: " << num_properties.error();
}
PersistentProperties result;
while (position_ < contents_.size()) {
auto name = ReadString();
if (!name) {
return Error() << "Could not read name: " << name.error();
}
if (!StartsWith(*name, "persist.")) {
return Error() << "Property '" << *name << "' does not starts with 'persist.'";
}
auto value = ReadString();
if (!value) {
return Error() << "Could not read value: " << value.error();
}
AddPersistentProperty(*name, *value, &result);
}
return result;
}
Result<std::string> PersistentPropertyFileParser::ReadString() {
auto string_length = ReadUint32();
if (!string_length) {
return Error() << "Could not read size for string";
}
if (position_ + *string_length > contents_.size()) {
return Error() << "String size would cause it to overflow the input buffer";
}
auto result = std::string(contents_, position_, *string_length);
position_ += *string_length;
return result;
}
Result<uint32_t> PersistentPropertyFileParser::ReadUint32() {
if (position_ + 3 > contents_.size()) {
return Error() << "Input buffer not large enough to read uint32_t";
}
uint32_t result = *reinterpret_cast<const uint32_t*>(&contents_[position_]);
position_ += sizeof(uint32_t);
return result;
}
Result<std::string> ReadPersistentPropertyFile() {
const std::string temp_filename = persistent_property_filename + ".tmp";
if (access(temp_filename.c_str(), F_OK) == 0) {
@ -240,24 +160,13 @@ Result<PersistentProperties> LoadPersistentPropertyFile() {
auto file_contents = ReadPersistentPropertyFile();
if (!file_contents) return file_contents.error();
// Check the intermediate "I should have used protobufs from the start" format.
// TODO: Remove this.
auto parsed_contents = PersistentPropertyFileParser(*file_contents).Parse();
if (parsed_contents) {
LOG(INFO) << "Intermediate format persistent property file found, converting to protobuf";
// Update to the protobuf format
WritePersistentPropertyFile(*parsed_contents);
return parsed_contents;
}
PersistentProperties persistent_properties;
if (persistent_properties.ParseFromString(*file_contents)) return persistent_properties;
// If the file cannot be parsed in either format, then we don't have any recovery
// mechanisms, so we delete it to allow for future writes to take place successfully.
unlink(persistent_property_filename.c_str());
return Error() << "Unable to parse persistent property file: " << parsed_contents.error();
return Error() << "Unable to parse persistent property file: Could not parse protobuf";
}
Result<Success> WritePersistentPropertyFile(const PersistentProperties& persistent_properties) {
@ -288,25 +197,24 @@ Result<Success> WritePersistentPropertyFile(const PersistentProperties& persiste
// Persistent properties are not written often, so we rather not keep any data in memory and read
// then rewrite the persistent property file for each update.
void WritePersistentProperty(const std::string& name, const std::string& value) {
auto file_contents = ReadPersistentPropertyFile();
PersistentProperties persistent_properties;
auto persistent_properties = LoadPersistentPropertyFile();
if (!file_contents || !persistent_properties.ParseFromString(*file_contents)) {
if (!persistent_properties) {
LOG(ERROR) << "Recovering persistent properties from memory: "
<< (!file_contents ? file_contents.error_string() : "Could not parse protobuf");
<< persistent_properties.error();
persistent_properties = LoadPersistentPropertiesFromMemory();
}
auto it = std::find_if(persistent_properties.mutable_properties()->begin(),
persistent_properties.mutable_properties()->end(),
auto it = std::find_if(persistent_properties->mutable_properties()->begin(),
persistent_properties->mutable_properties()->end(),
[&name](const auto& record) { return record.name() == name; });
if (it != persistent_properties.mutable_properties()->end()) {
if (it != persistent_properties->mutable_properties()->end()) {
it->set_name(name);
it->set_value(value);
} else {
AddPersistentProperty(name, value, &persistent_properties);
AddPersistentProperty(name, value, &persistent_properties.value());
}
if (auto result = WritePersistentPropertyFile(persistent_properties); !result) {
if (auto result = WritePersistentPropertyFile(*persistent_properties); !result) {
LOG(ERROR) << "Could not store persistent property: " << result.error();
}
}