diff options
Diffstat (limited to 'third_party/nix/src/libutil/logging.cc')
| -rw-r--r-- | third_party/nix/src/libutil/logging.cc | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/third_party/nix/src/libutil/logging.cc b/third_party/nix/src/libutil/logging.cc new file mode 100644 index 0000000000..b379306f6e --- /dev/null +++ b/third_party/nix/src/libutil/logging.cc @@ -0,0 +1,242 @@ +#include "logging.hh" +#include "util.hh" + +#include <atomic> +#include <nlohmann/json.hpp> + +namespace nix { + +static thread_local ActivityId curActivity = 0; + +ActivityId getCurActivity() +{ + return curActivity; +} +void setCurActivity(const ActivityId activityId) +{ + curActivity = activityId; +} + +Logger * logger = makeDefaultLogger(); + +void Logger::warn(const std::string & msg) +{ + log(lvlWarn, ANSI_RED "warning:" ANSI_NORMAL " " + msg); +} + +class SimpleLogger : public Logger +{ +public: + + bool systemd, tty; + + SimpleLogger() + { + systemd = getEnv("IN_SYSTEMD") == "1"; + tty = isatty(STDERR_FILENO); + } + + void log(Verbosity lvl, const FormatOrString & fs) override + { + if (lvl > verbosity) return; + + std::string prefix; + + if (systemd) { + char c; + switch (lvl) { + case lvlError: c = '3'; break; + case lvlWarn: c = '4'; break; + case lvlInfo: c = '5'; break; + case lvlTalkative: case lvlChatty: c = '6'; break; + default: c = '7'; + } + prefix = std::string("<") + c + ">"; + } + + writeToStderr(prefix + filterANSIEscapes(fs.s, !tty) + "\n"); + } + + void startActivity(ActivityId act, Verbosity lvl, ActivityType type, + const std::string & s, const Fields & fields, ActivityId parent) + override + { + if (lvl <= verbosity && !s.empty()) + log(lvl, s + "..."); + } +}; + +Verbosity verbosity = lvlInfo; + +void warnOnce(bool & haveWarned, const FormatOrString & fs) +{ + if (!haveWarned) { + warn(fs.s); + haveWarned = true; + } +} + +void writeToStderr(const string & s) +{ + try { + writeFull(STDERR_FILENO, s, false); + } catch (SysError & e) { + /* Ignore failing writes to stderr. We need to ignore write + errors to ensure that cleanup code that logs to stderr runs + to completion if the other side of stderr has been closed + unexpectedly. */ + } +} + +Logger * makeDefaultLogger() +{ + return new SimpleLogger(); +} + +std::atomic<uint64_t> nextId{(uint64_t) getpid() << 32}; + +Activity::Activity(Logger & logger, Verbosity lvl, ActivityType type, + const std::string & s, const Logger::Fields & fields, ActivityId parent) + : logger(logger), id(nextId++) +{ + logger.startActivity(id, lvl, type, s, fields, parent); +} + +struct JSONLogger : Logger +{ + Logger & prevLogger; + + JSONLogger(Logger & prevLogger) : prevLogger(prevLogger) { } + + void addFields(nlohmann::json & json, const Fields & fields) + { + if (fields.empty()) return; + auto & arr = json["fields"] = nlohmann::json::array(); + for (auto & f : fields) + if (f.type == Logger::Field::tInt) + arr.push_back(f.i); + else if (f.type == Logger::Field::tString) + arr.push_back(f.s); + else + abort(); + } + + void write(const nlohmann::json & json) + { + prevLogger.log(lvlError, "@nix " + json.dump()); + } + + void log(Verbosity lvl, const FormatOrString & fs) override + { + nlohmann::json json; + json["action"] = "msg"; + json["level"] = lvl; + json["msg"] = fs.s; + write(json); + } + + void startActivity(ActivityId act, Verbosity lvl, ActivityType type, + const std::string & s, const Fields & fields, ActivityId parent) override + { + nlohmann::json json; + json["action"] = "start"; + json["id"] = act; + json["level"] = lvl; + json["type"] = type; + json["text"] = s; + addFields(json, fields); + // FIXME: handle parent + write(json); + } + + void stopActivity(ActivityId act) override + { + nlohmann::json json; + json["action"] = "stop"; + json["id"] = act; + write(json); + } + + void result(ActivityId act, ResultType type, const Fields & fields) override + { + nlohmann::json json; + json["action"] = "result"; + json["id"] = act; + json["type"] = type; + addFields(json, fields); + write(json); + } +}; + +Logger * makeJSONLogger(Logger & prevLogger) +{ + return new JSONLogger(prevLogger); +} + +static Logger::Fields getFields(nlohmann::json & json) +{ + Logger::Fields fields; + for (auto & f : json) { + if (f.type() == nlohmann::json::value_t::number_unsigned) + fields.emplace_back(Logger::Field(f.get<uint64_t>())); + else if (f.type() == nlohmann::json::value_t::string) + fields.emplace_back(Logger::Field(f.get<std::string>())); + else throw Error("unsupported JSON type %d", (int) f.type()); + } + return fields; +} + +bool handleJSONLogMessage(const std::string & msg, + const Activity & act, std::map<ActivityId, Activity> & activities, bool trusted) +{ + if (!hasPrefix(msg, "@nix ")) return false; + + try { + auto json = nlohmann::json::parse(std::string(msg, 5)); + + std::string action = json["action"]; + + if (action == "start") { + auto type = (ActivityType) json["type"]; + if (trusted || type == actDownload) + activities.emplace(std::piecewise_construct, + std::forward_as_tuple(json["id"]), + std::forward_as_tuple(*logger, (Verbosity) json["level"], type, + json["text"], getFields(json["fields"]), act.id)); + } + + else if (action == "stop") + activities.erase((ActivityId) json["id"]); + + else if (action == "result") { + auto i = activities.find((ActivityId) json["id"]); + if (i != activities.end()) + i->second.result((ResultType) json["type"], getFields(json["fields"])); + } + + else if (action == "setPhase") { + std::string phase = json["phase"]; + act.result(resSetPhase, phase); + } + + else if (action == "msg") { + std::string msg = json["msg"]; + logger->log((Verbosity) json["level"], msg); + } + + } catch (std::exception & e) { + printError("bad log message from builder: %s", e.what()); + } + + return true; +} + +Activity::~Activity() { + try { + logger.stopActivity(id); + } catch (...) { + ignoreException(); + } +} + +} |