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util: Add ReadSettings and WriteSettings functions

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Currently unused, but includes tests.
This commit is contained in:
Russell Yanofsky
2019-04-28 19:08:26 -04:00
parent a42631775a
commit eb682c5700
3 changed files with 149 additions and 0 deletions
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57
src/util/settings.cpp
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@@ -4,6 +4,7 @@
#include <util/settings.h>
#include <tinyformat.h>
#include <univalue.h>
namespace util {
@@ -49,6 +50,62 @@ static void MergeSettings(const Settings& settings, const std::string& section,
}
} // namespace
bool ReadSettings(const fs::path& path, std::map<std::string, SettingsValue>& values, std::vector<std::string>& errors)
{
values.clear();
errors.clear();
fsbridge::ifstream file;
file.open(path);
if (!file.is_open()) return true; // Ok for file not to exist.
SettingsValue in;
if (!in.read(std::string{std::istreambuf_iterator<char>(file), std::istreambuf_iterator<char>()})) {
errors.emplace_back(strprintf("Unable to parse settings file %s", path.string()));
return false;
}
if (file.fail()) {
errors.emplace_back(strprintf("Failed reading settings file %s", path.string()));
return false;
}
file.close(); // Done with file descriptor. Release while copying data.
if (!in.isObject()) {
errors.emplace_back(strprintf("Found non-object value %s in settings file %s", in.write(), path.string()));
return false;
}
const std::vector<std::string>& in_keys = in.getKeys();
const std::vector<SettingsValue>& in_values = in.getValues();
for (size_t i = 0; i < in_keys.size(); ++i) {
auto inserted = values.emplace(in_keys[i], in_values[i]);
if (!inserted.second) {
errors.emplace_back(strprintf("Found duplicate key %s in settings file %s", in_keys[i], path.string()));
}
}
return errors.empty();
}
bool WriteSettings(const fs::path& path,
const std::map<std::string, SettingsValue>& values,
std::vector<std::string>& errors)
{
SettingsValue out(SettingsValue::VOBJ);
for (const auto& value : values) {
out.__pushKV(value.first, value.second);
}
fsbridge::ofstream file;
file.open(path);
if (file.fail()) {
errors.emplace_back(strprintf("Error: Unable to open settings file %s for writing", path.string()));
return false;
}
file << out.write(/* prettyIndent= */ 1, /* indentLevel= */ 4) << std::endl;
file.close();
return true;
}
SettingsValue GetSetting(const Settings& settings,
const std::string& section,
const std::string& name,