fgerlits commented on a change in pull request #791: URL: https://github.com/apache/nifi-minifi-cpp/pull/791#discussion_r439391205
########## File path: extensions/standard-processors/processors/TailFile.cpp ########## @@ -40,60 +35,283 @@ #include <utility> #include <vector> +#include "io/CRCStream.h" #include "utils/file/FileUtils.h" #include "utils/file/PathUtils.h" #include "utils/TimeUtil.h" #include "utils/StringUtils.h" #include "utils/RegexUtils.h" -#ifdef HAVE_REGEX_CPP -#include <regex> -#else -#include <regex.h> -#endif #include "TailFile.h" #include "core/ProcessContext.h" #include "core/ProcessSession.h" -#ifndef S_ISDIR -#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) -#endif - -#if defined(__clang__) -#pragma clang diagnostic push -#pragma clang diagnostic ignored "-Wsign-compare" -#elif defined(__GNUC__) || defined(__GNUG__) -#pragma GCC diagnostic push -#pragma GCC diagnostic ignored "-Wsign-compare" -#endif - namespace org { namespace apache { namespace nifi { namespace minifi { namespace processors { -core::Property TailFile::FileName("File to Tail", "Fully-qualified filename of the file that should be tailed when using single file mode, or a file regex when using multifile mode", ""); -core::Property TailFile::StateFile("State File", "DEPRECATED. Only use it for state migration from the legacy state file.", - "TailFileState"); -core::Property TailFile::Delimiter("Input Delimiter", "Specifies the character that should be used for delimiting the data being tailed" - "from the incoming file." - "If none is specified, data will be ingested as it becomes available.", - ""); +core::Property TailFile::FileName( + core::PropertyBuilder::createProperty("File to Tail") + ->withDescription("Fully-qualified filename of the file that should be tailed when using single file mode, or a file regex when using multifile mode") + ->isRequired(true) + ->build()); + +core::Property TailFile::StateFile( + core::PropertyBuilder::createProperty("State File") + ->withDescription("DEPRECATED. Only use it for state migration from the legacy state file.") + ->isRequired(false) + ->withDefaultValue<std::string>("TailFileState") + ->build()); + +core::Property TailFile::Delimiter( + core::PropertyBuilder::createProperty("Input Delimiter") + ->withDescription("Specifies the character that should be used for delimiting the data being tailed" + "from the incoming file. If none is specified, data will be ingested as it becomes available.") + ->isRequired(false) + ->withDefaultValue<std::string>("\\n") + ->build()); core::Property TailFile::TailMode( - core::PropertyBuilder::createProperty("tail-mode", "Tailing Mode")->withDescription( - "Specifies the tail file mode. In 'Single file' mode only a single file will be watched. " + core::PropertyBuilder::createProperty("tail-mode", "Tailing Mode") + ->withDescription("Specifies the tail file mode. In 'Single file' mode only a single file will be watched. " "In 'Multiple file' mode a regex may be used. Note that in multiple file mode we will still continue to watch for rollover on the initial set of watched files. " "The Regex used to locate multiple files will be run during the schedule phrase. Note that if rotated files are matched by the regex, those files will be tailed.")->isRequired(true) - ->withAllowableValue<std::string>("Single file")->withAllowableValue("Multiple file")->withDefaultValue("Single file")->build()); - -core::Property TailFile::BaseDirectory(core::PropertyBuilder::createProperty("tail-base-directory", "Base Directory")->isRequired(false)->build()); + ->withAllowableValue<std::string>("Single file")->withAllowableValue("Multiple file")->withDefaultValue("Single file") + ->build()); + +core::Property TailFile::BaseDirectory( + core::PropertyBuilder::createProperty("tail-base-directory", "Base Directory") + ->withDescription("Base directory used to look for files to tail. This property is required when using Multiple file mode.") + ->isRequired(false) + ->build()); + +core::Property TailFile::RecursiveLookup( + core::PropertyBuilder::createProperty("Recursive lookup") + ->withDescription("When using Multiple file mode, this property determines whether files are tailed in " + "child directories of the Base Directory or not.") + ->isRequired(false) + ->withDefaultValue<bool>(false) + ->build()); + +core::Property TailFile::LookupFrequency( + core::PropertyBuilder::createProperty("Lookup frequency") + ->withDescription("When using Multiple file mode, this property specifies the minimum duration " + "the processor will wait between looking for new files to tail in the Base Directory.") + ->isRequired(false) + ->withDefaultValue<core::TimePeriodValue>("10 min") + ->build()); + +core::Property TailFile::RollingFilenamePattern( + core::PropertyBuilder::createProperty("Rolling Filename Pattern") + ->withDescription("If the file to tail \"rolls over\" as would be the case with log files, this filename pattern will be used to " + "identify files that have rolled over so MiNiFi can read the remaining of the rolled-over file and then continue with the new log file. " + "This pattern supports the wildcard characters * and ?, it also supports the notation ${filename} to specify a pattern based on the name of the file " + "(without extension), and will assume that the files that have rolled over live in the same directory as the file being tailed.") + ->isRequired(false) + ->withDefaultValue<std::string>("${filename}.*") + ->build()); core::Relationship TailFile::Success("success", "All files are routed to success"); const char *TailFile::CURRENT_STR = "CURRENT."; const char *TailFile::POSITION_STR = "POSITION."; +namespace { +template<typename Container, typename Key> +bool containsKey(const Container &container, const Key &key) { + return container.find(key) != container.end(); +} + +template <typename Container, typename Key> +uint64_t readOptionalUint64(const Container &container, const Key &key) { + const auto it = container.find(key); + if (it != container.end()) { + return std::stoull(it->second); + } else { + return 0; + } +} + +// the delimiter is the first character of the input, allowing some escape sequences +std::string parseDelimiter(const std::string &input) { + if (input.empty()) return ""; + if (input[0] != '\\') return std::string{ input[0] }; + if (input.size() == std::size_t{1}) return "\\"; + switch (input[1]) { + case 'r': return "\r"; + case 't': return "\t"; + case 'n': return "\n"; + default: return std::string{ input[1] }; + } +} + +std::map<std::string, TailState> update_keys_in_legacy_states(const std::map<std::string, TailState> &legacy_tail_states) { + std::map<std::string, TailState> new_tail_states; + for (const auto &key_value_pair : legacy_tail_states) { + const TailState &state = key_value_pair.second; + std::string full_file_name = utils::file::FileUtils::concat_path(state.path_, state.file_name_); + new_tail_states.emplace(full_file_name, state); + } + return new_tail_states; +} + +struct TailStateWithMtime { + using TimePoint = std::chrono::time_point<std::chrono::system_clock, std::chrono::seconds>; + + TailStateWithMtime(TailState tail_state, TimePoint mtime) + : tail_state_(std::move(tail_state)), mtime_(mtime) {} + + TailState tail_state_; + TimePoint mtime_; +}; + +void openFile(const std::string &file_name, uint64_t offset, std::ifstream &input_stream, const std::shared_ptr<logging::Logger> &logger) { + logger->log_debug("Opening %s", file_name); + input_stream.open(file_name.c_str(), std::fstream::in | std::fstream::binary); + if (!input_stream.is_open() || !input_stream.good()) { + input_stream.close(); + throw Exception(FILE_OPERATION_EXCEPTION, "Could not open file: " + file_name); + } + if (offset != 0U) { + input_stream.seekg(offset, std::ifstream::beg); + if (!input_stream.good()) { + logger->log_error("Seeking to %lu failed for file %s (does file/filesystem support seeking?)", offset, file_name); Review comment: done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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