示例#1
0
文件: read.go 项目: DaveDaCoda/docker
func (s *journald) drainJournal(logWatcher *logger.LogWatcher, config logger.ReadConfig, j *C.sd_journal, oldCursor string) string {
	var msg, cursor *C.char
	var length C.size_t
	var stamp C.uint64_t
	var priority C.int

	// Walk the journal from here forward until we run out of new entries.
drain:
	for {
		// Try not to send a given entry twice.
		if oldCursor != "" {
			ccursor := C.CString(oldCursor)
			defer C.free(unsafe.Pointer(ccursor))
			for C.sd_journal_test_cursor(j, ccursor) > 0 {
				if C.sd_journal_next(j) <= 0 {
					break drain
				}
			}
		}
		// Read and send the logged message, if there is one to read.
		i := C.get_message(j, &msg, &length)
		if i != -C.ENOENT && i != -C.EADDRNOTAVAIL {
			// Read the entry's timestamp.
			if C.sd_journal_get_realtime_usec(j, &stamp) != 0 {
				break
			}
			// Set up the time and text of the entry.
			timestamp := time.Unix(int64(stamp)/1000000, (int64(stamp)%1000000)*1000)
			line := append(C.GoBytes(unsafe.Pointer(msg), C.int(length)), "\n"...)
			// Recover the stream name by mapping
			// from the journal priority back to
			// the stream that we would have
			// assigned that value.
			source := ""
			if C.get_priority(j, &priority) != 0 {
				source = ""
			} else if priority == C.int(journal.PriErr) {
				source = "stderr"
			} else if priority == C.int(journal.PriInfo) {
				source = "stdout"
			}
			// Send the log message.
			cid := s.vars["CONTAINER_ID_FULL"]
			logWatcher.Msg <- &logger.Message{ContainerID: cid, Line: line, Source: source, Timestamp: timestamp}
		}
		// If we're at the end of the journal, we're done (for now).
		if C.sd_journal_next(j) <= 0 {
			break
		}
	}
	retCursor := ""
	if C.sd_journal_get_cursor(j, &cursor) == 0 {
		retCursor = C.GoString(cursor)
		C.free(unsafe.Pointer(cursor))
	}
	return retCursor
}
示例#2
0
func (s *journald) drainJournal(logWatcher *logger.LogWatcher, config logger.ReadConfig, j *C.sd_journal, oldCursor string) string {
	var msg, data, cursor *C.char
	var length C.size_t
	var stamp C.uint64_t
	var priority C.int

	// Walk the journal from here forward until we run out of new entries.
drain:
	for {
		// Try not to send a given entry twice.
		if oldCursor != "" {
			ccursor := C.CString(oldCursor)
			defer C.free(unsafe.Pointer(ccursor))
			for C.sd_journal_test_cursor(j, ccursor) > 0 {
				if C.sd_journal_next(j) <= 0 {
					break drain
				}
			}
		}
		// Read and send the logged message, if there is one to read.
		i := C.get_message(j, &msg, &length)
		if i != -C.ENOENT && i != -C.EADDRNOTAVAIL {
			// Read the entry's timestamp.
			if C.sd_journal_get_realtime_usec(j, &stamp) != 0 {
				break
			}
			// Set up the time and text of the entry.
			timestamp := time.Unix(int64(stamp)/1000000, (int64(stamp)%1000000)*1000)
			line := append(C.GoBytes(unsafe.Pointer(msg), C.int(length)), "\n"...)
			// Recover the stream name by mapping
			// from the journal priority back to
			// the stream that we would have
			// assigned that value.
			source := ""
			if C.get_priority(j, &priority) != 0 {
				source = ""
			} else if priority == C.int(journal.PriErr) {
				source = "stderr"
			} else if priority == C.int(journal.PriInfo) {
				source = "stdout"
			}
			// Retrieve the values of any variables we're adding to the journal.
			attrs := make(map[string]string)
			C.sd_journal_restart_data(j)
			for C.get_attribute_field(j, &data, &length) > C.int(0) {
				kv := strings.SplitN(C.GoStringN(data, C.int(length)), "=", 2)
				attrs[kv[0]] = kv[1]
			}
			if len(attrs) == 0 {
				attrs = nil
			}
			// Send the log message.
			logWatcher.Msg <- &logger.Message{
				Line:      line,
				Source:    source,
				Timestamp: timestamp.In(time.UTC),
				Attrs:     attrs,
			}
		}
		// If we're at the end of the journal, we're done (for now).
		if C.sd_journal_next(j) <= 0 {
			break
		}
	}
	retCursor := ""
	if C.sd_journal_get_cursor(j, &cursor) == 0 {
		retCursor = C.GoString(cursor)
		C.free(unsafe.Pointer(cursor))
	}
	return retCursor
}