mirror of
https://github.com/kubernetes/node-problem-detector.git
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105 lines
3.5 KiB
Go
105 lines
3.5 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package filelog
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import (
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"fmt"
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"regexp"
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"time"
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logtypes "k8s.io/node-problem-detector/pkg/systemlogmonitor/types"
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"github.com/golang/glog"
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)
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// translator translates log line into internal log type based on user defined
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// regular expression.
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type translator struct {
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timestampRegexp *regexp.Regexp
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messageRegexp *regexp.Regexp
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timestampFormat string
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}
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const (
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// NOTE that we support submatch for both timestamp and message regular expressions. When
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// there are multiple matches returned by submatch, only **the last** is used.
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// timestampKey is the key of timestamp regular expression in the plugin configuration.
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timestampKey = "timestamp"
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// messageKey is the key of message regular expression in the plugin configuration.
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messageKey = "message"
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// timestampFormatKey is the key of timestamp format string in the plugin configuration.
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timestampFormatKey = "timestampFormat"
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)
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func newTranslatorOrDie(pluginConfig map[string]string) *translator {
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if err := validatePluginConfig(pluginConfig); err != nil {
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glog.Errorf("Failed to validate plugin configuration %+v: %v", pluginConfig, err)
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}
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return &translator{
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timestampRegexp: regexp.MustCompile(pluginConfig[timestampKey]),
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messageRegexp: regexp.MustCompile(pluginConfig[messageKey]),
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timestampFormat: pluginConfig[timestampFormatKey],
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}
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}
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// translate translates the log line into internal type.
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func (t *translator) translate(line string) (*logtypes.Log, error) {
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// Parse timestamp.
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matches := t.timestampRegexp.FindStringSubmatch(line)
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if len(matches) == 0 {
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return nil, fmt.Errorf("no timestamp found in line %q with regular expression %v", line, t.timestampRegexp)
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}
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timestamp, err := time.ParseInLocation(t.timestampFormat, matches[len(matches)-1], time.Local)
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if err != nil {
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return nil, fmt.Errorf("failed to parse timestamp %q: %v", matches[len(matches)-1], err)
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}
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// Formalize the timestamp.
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timestamp = formalizeTimestamp(timestamp)
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// Parse message.
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matches = t.messageRegexp.FindStringSubmatch(line)
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if len(matches) == 0 {
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return nil, fmt.Errorf("no message found in line %q with regular expression %v", line, t.messageRegexp)
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}
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message := matches[len(matches)-1]
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return &logtypes.Log{
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Timestamp: timestamp,
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Message: message,
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}, nil
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}
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// validatePluginConfig validates whether the plugin configuration.
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func validatePluginConfig(cfg map[string]string) error {
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if cfg[timestampKey] == "" {
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return fmt.Errorf("unexpected empty timestamp regular expression")
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}
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if cfg[messageKey] == "" {
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return fmt.Errorf("unexpected empty message regular expression")
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}
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if cfg[timestampFormatKey] == "" {
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return fmt.Errorf("unexpected empty timestamp format string")
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}
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return nil
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}
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// formalizeTimestamp formalizes the timestamp. We need this because some log doesn't contain full
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// timestamp, e.g. filelog.
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func formalizeTimestamp(t time.Time) time.Time {
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if t.Year() == 0 {
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t = t.AddDate(time.Now().Year(), 0, 0)
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}
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return t
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}
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