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reader.go
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reader.go
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package sapcontrol
import (
"bufio"
"fmt"
"io"
"regexp"
"strconv"
"strings"
"time"
)
// systems timezone
var tz string
func init() {
// get systems timezone
tz, _ = time.Now().In(time.Local).Zone()
}
// Read reads in output of sapcontrol and stores in SapcontrolOutput struct.
func Read(r io.Reader) (SapcontrolOutput, error) {
// compile regexs
// do it inside of function body because Read() will be called normally once per execution
reWord := regexp.MustCompile(`^\s*(\w+)\s*$`)
reTime := regexp.MustCompile(`^\s*([0-9.]+\s[0-9:]+)\s*$`)
var output SapcontrolOutput
// create new scanner from io.Reader
scanner := bufio.NewScanner(r)
for scanner.Scan() {
line := scanner.Text()
switch {
case line == "":
// skip empty lines
continue
case strings.HasPrefix(line, "Unknown webmethod:"):
// unknown function call
return SapcontrolOutput{}, fmt.Errorf(scanner.Text())
case reTime.MatchString(line):
// append local timezone
t := reTime.FindString(line) + tz
output.ExecTimePoint, _ = time.Parse(SAPControlTimeLayout, t)
case reWord.MatchString(line):
word := reWord.FindString(line)
if stringInSlice(word, SupportedSapControlFunctions) {
output.Function = word
} else if word == "OK" {
output.Status = "OK"
} else {
// not sure what to do...
continue
}
default:
output.Content = append(output.Content, line)
}
}
// check for errors during scan
err := scanner.Err()
return output, err
}
// GetProcssList extracts ProcessList from sapcontrol output.
func (s SapcontrolOutput) GetProcssList() (ProcessList, ProcessingErrors) {
var pErr ProcessingErrors
// check if function call was "GetProcessList"
if s.Function != "GetProcessList" {
pErr = append(pErr, ProcessingError{
Action: "skip",
LineNumber: -1,
Message: fmt.Sprintf("all records were skipped due to wrong function: got %s want %s", s.Function, "GetProcessList"),
})
return nil, pErr
}
var list ProcessList
// start at 1 because of header
for i := 1; i < len(s.Content); i++ {
// get fields of record
subs := strings.Split(s.Content[i], ",")
// each record needs to have at least 11 fields
if len(subs) < ProcessListRecordSize {
pErr = append(pErr, ProcessingError{
Action: "skip",
LineNumber: i,
Message: fmt.Sprintf("record in line %d was skipped due to too less fields: got %d want %d", i, len(subs), ProcessListRecordSize),
})
continue
}
// prepare fields
name := strings.TrimSpace(subs[0])
description := strings.TrimSpace(subs[1])
dispStatus := strings.TrimSpace(subs[2])
textStatus := strings.TrimSpace(subs[3])
startTime, err := time.Parse(TimeLayout, strings.TrimSpace(subs[4])+tz)
if err != nil {
pErr = append(pErr, ProcessingError{
Action: "ignore",
LineNumber: i,
Message: fmt.Sprintf("starttime field of record in line %d was ignored due to parsing error: %v", i, err),
})
}
// elapsedtime is a duration
duration := strings.TrimSpace(subs[5])
d := strings.Split(duration, ":")
if len(d) == 3 {
// insert h, m and s characters to get it parsed
duration = fmt.Sprintf("%sh%sm%ss", d[0], d[1], d[2])
}
elapsedTime, err := time.ParseDuration(duration)
if err != nil {
pErr = append(pErr, ProcessingError{
Action: "ignore",
LineNumber: i,
Message: fmt.Sprintf("elapsedtime field of record in line %d was ignored due to parsing error: %v", i, err),
})
}
pid, err := strconv.Atoi(strings.TrimSpace(subs[6]))
if err != nil {
pErr = append(pErr, ProcessingError{
Action: "ignore",
LineNumber: i,
Message: fmt.Sprintf("pid field of record in line %d was ignored due to parsing error: %v", i, err),
})
}
// build up Process from prepared fields
process := Process{
Name: name,
Description: description,
DispStatus: dispStatus,
TextStatus: textStatus,
StartTime: startTime,
ElapsedTime: elapsedTime,
Pid: pid,
}
// add Process to slice
list = append(list, process)
}
return list, pErr
}
// GetAlertNodes extracts AlertNodes from sapcontrol output.
func (s SapcontrolOutput) GetAlertNodes() (AlertNodes, ProcessingErrors) {
var pErr ProcessingErrors
// check if function call was "GetAlertTree"
if s.Function != "GetAlertTree" {
pErr = append(pErr, ProcessingError{
Action: "skip",
LineNumber: -1,
Message: fmt.Sprintf("all records were skipped due to wrong function: got %s want %s", s.Function, "GetAlertTree"),
})
return nil, pErr
}
var nodes AlertNodes
// lineNumber is not same as i because of random line breaks!
lineNumber := -1
// start at 1 because of header
for i := 1; i < len(s.Content); i++ {
// initially start at -1 and increment at beginning because of some continue calls, defer is slow
lineNumber++
// check if line ends with ; else read next line and join them
// some csv fields contain new lines, this is bad
// check only up to 10 times to prevent endless loops
var line string
for j := 0; j < 10; j++ {
line += s.Content[i]
if strings.HasSuffix(line, ";") {
break
}
i++
}
// we can not use encoding/csv reader because the provided records are often invalid
// there are often field separators inside fields
// so do it manually
subs := strings.Split(line, ",")
// each record needs to have at least 11 fields
if len(subs) < AlertNodeRecordSize {
pErr = append(pErr, ProcessingError{
Action: "skip",
LineNumber: i,
Message: fmt.Sprintf("record in line %d was skipped due to too less fields: got %d want %d", i, len(subs), AlertNodeRecordSize),
})
continue
}
// check if FixLandmarkField is AlertColor because it is our fixed landmark
if !stringInSlice(strings.TrimSpace(subs[AlertNodeFixLandmarkField-1]), AlertColors) {
pErr = append(pErr, ProcessingError{
Action: "skip",
LineNumber: lineNumber,
Message: fmt.Sprintf("record in line %d was skipped due to not finding fixed landmark at expected offset %d", lineNumber, AlertNodeFixLandmarkField),
})
continue
}
// search second COLOR because it is our dynamic landmark
landmark := 0
for i := 3; i < len(subs); i++ {
if stringInSlice(strings.TrimSpace(subs[i]), AlertColors) {
landmark = i
break
}
}
if landmark == 0 {
pErr = append(pErr, ProcessingError{
Action: "skip",
LineNumber: lineNumber,
Message: fmt.Sprintf("record in line %d was skipped due to not finding dynamic landmark", lineNumber),
})
continue
}
// prepare fields
name := strings.TrimSpace(subs[0])
parent, err := strconv.Atoi(strings.TrimSpace(subs[1]))
if err != nil {
pErr = append(pErr, ProcessingError{
Action: "ignore",
LineNumber: lineNumber,
Message: fmt.Sprintf("parent field of record in line %d was ignored due to parsing error: %v", lineNumber, err),
})
}
actualValue := strings.TrimSpace(subs[2])
description := strings.TrimSpace(strings.Join(subs[3:landmark-3], ","))
timeParsed, err := time.Parse(TimeLayout, strings.TrimSpace(subs[landmark-3])+tz)
// only check if not empty string was parsed
if err != nil && len(strings.TrimSpace(subs[landmark-3])) > 0 {
pErr = append(pErr, ProcessingError{
Action: "ignore",
LineNumber: lineNumber,
Message: fmt.Sprintf("Time field of record in line %d was ignored due to parsing error: %v", lineNumber, err),
})
}
analyseTool := strings.TrimSpace(subs[landmark-2])
visibleLevel := strings.TrimSpace(subs[landmark-1])
highAlertValue := strings.TrimSpace(subs[landmark])
alDescription := strings.TrimSpace(strings.Join(subs[landmark+1:len(subs)-2], ","))
alTimeParsed, err := time.Parse(TimeLayout, strings.TrimSpace(subs[len(subs)-2])+tz)
if err != nil && len(strings.TrimSpace(subs[len(subs)-2])) > 0 {
pErr = append(pErr, ProcessingError{
Action: "ignore",
LineNumber: lineNumber,
Message: fmt.Sprintf("AlTime field of record in line %d was ignored due to parsing error: %v", lineNumber, err),
})
}
tid := strings.TrimSpace(subs[len(subs)-1])
// build up AlertNode from prepared fields
node := AlertNode{
ID: lineNumber,
Name: name,
Parent: parent,
ActualValue: actualValue,
Description: description,
Time: timeParsed,
AnalyseTool: analyseTool,
VisibleLevel: visibleLevel,
HighAlertValue: highAlertValue,
AlDescription: alDescription,
AlTime: alTimeParsed,
Tid: tid,
}
// add AlertNode to slice
nodes = append(nodes, node)
}
return nodes, pErr
}