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config_ini.go
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/
config_ini.go
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/*
* Copyright (c) 2016 Yanko Bolanos
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
package main
import (
"fmt"
"gopkg.in/ini.v1"
"io"
"io/ioutil"
"regexp"
"strconv"
"strings"
log "github.com/Sirupsen/logrus"
)
var typeLengthRegex = regexp.MustCompile(`^([^,]*),?(.*)?`)
var skipSections = regexp.MustCompile(`(record_format|DEFAULT|\w+\.\w)`) // only for parsing loglifes
var streamRecordFormatSection = regexp.MustCompile(`^stream\.(?P<stream>.*)\.record_format$`) // only streams record format
func parseConfigINI(src io.Reader) ConfigFile {
data, err := ioutil.ReadAll(src)
if err != nil {
log.Fatalf(err.Error())
}
cfg, err := ini.Load(data)
if err != nil {
log.Fatal(err.Error())
}
var config ConfigFile
err = cfg.Section("DEFAULT").MapTo(&config)
if err != nil {
log.Fatal(err.Error())
}
sections := cfg.SectionStrings()
for _, section := range sections {
matches := streamRecordFormatSection.FindStringSubmatch(section)
if len(matches) > 1 {
log.Printf("Parsing streamSection: %s", section)
var stream StreamConfig
stream.StreamName = matches[1]
err := cfg.Section(section).MapTo(&stream)
if err != nil {
log.Fatal(err.Error())
}
config.Streams = append(config.Streams, stream)
}
}
for _, section := range sections {
matches := streamRecordFormatSection.FindStringSubmatch(section)
if len(matches) > 1 {
streamName := matches[1]
if stream, ok := config.GetStream(streamName); ok {
stream.RecordFormat = parseRecordFormat(cfg, section)
log.Infof("Parsing streamRecordFormatSection: %s", section)
for i := 0; i < len(stream.RecordFormat); i++ {
log.Infof("%v -> %+v", stream.Name, stream.RecordFormat[i])
}
} else {
log.Fatalf("stream not found. %s", streamName)
}
}
}
for _, section := range sections {
if !skipSections.MatchString(section) {
logfile := parseLogfileSection(cfg, section)
config.Logfiles = append(config.Logfiles, logfile)
}
}
return config
}
func parseLogfileSection(cfg *ini.File, sectionName string) Logfile {
var n Logfile
err := cfg.Section(sectionName).MapTo(&n)
if err != nil {
log.Fatal(err.Error())
}
if n.FrontSplitRegexStr != "" {
n.FrontSplitRegex = regexp.MustCompile(n.FrontSplitRegexStr)
}
if n.ParseMode == "regex" {
n.Regex = regexp.MustCompile(n.LineRegex)
} else if n.ParseMode == "json" || n.ParseMode == "date_keyvalue" {
subsectionName := fmt.Sprintf("%s.field_mappings", sectionName)
subsection, err := cfg.GetSection(subsectionName)
if err != nil {
log.Fatalf("json needs subsection with field_mappings")
}
keyNames := subsection.KeyStrings()
keyValues := subsection.Keys()
n.FieldMappings = make(map[string]string, len(keyNames))
for i := 0; i < len(keyNames); i++ {
n.FieldMappings[keyNames[i]] = keyValues[i].String()
}
} else if n.ParseMode == "csv" {
n.FieldsOrder = parseFieldOrder(n.FieldsOrderStr)
if len(n.FieldsOrder) == 0 {
log.Fatalf("csv needs subsection with field_mappings")
}
}
return n
}
func parseFieldOrder(fieldOrder string) []string {
return strings.Split(fieldOrder, ",")
}
func parseRecordFormat(cfg *ini.File, section string) []Attribute {
recordFormat := []Attribute{}
record, err := cfg.GetSection(section)
if err != nil {
return defaultAttributes
}
keyNames := record.KeyStrings()
keyValues := record.Keys()
for i := 0; i < len(keyNames); i++ {
typeLength := typeLengthRegex.FindStringSubmatch(keyValues[i].String())
val := Attribute{Key: keyNames[i]}
if len(typeLength) > 0 {
val.Type = typeLength[1]
val.Length, _ = strconv.Atoi(typeLength[2])
}
recordFormat = append(recordFormat, val)
}
return recordFormat
}