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inserter.go
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/
inserter.go
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package main
import (
"bufio"
"flag"
"fmt"
"os"
"regexp"
"strings"
)
func main() {
fileName := flag.String("f", "", "path to the file")
replayOverheadString := flag.String("r", "false", "replay overhead")
replayNum := flag.String("n", "1", "replay number")
flag.Parse()
replayOverhead := false
if *replayOverheadString == "true" {
replayOverhead = true
}
if *fileName == "" {
fmt.Fprintln(os.Stderr, "Please provide a file name")
fmt.Fprintln(os.Stderr, "Usage: preambleInserter -f <file>")
os.Exit(1)
}
if _, err := os.Stat(*fileName); os.IsNotExist(err) {
fmt.Fprintf(os.Stderr, "File %s does not exist\n", *fileName)
os.Exit(1)
}
exists, err := mainMethodExists(*fileName)
if err != nil {
fmt.Fprintln(os.Stderr, "Error:", err)
os.Exit(1)
}
if !exists {
fmt.Fprintln(os.Stderr, "Main Method not found in file")
os.Exit(1)
}
addOverhead(*fileName, replayOverhead, *replayNum)
}
func mainMethodExists(fileName string) (bool, error) {
file, err := os.Open(fileName)
if err != nil {
return false, err
}
defer file.Close()
regexStr := "func main\\(\\) {"
regex, err := regexp.Compile(regexStr)
if err != nil {
return false, err
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
if regex.MatchString(line) {
return true, nil
}
}
if err := scanner.Err(); err != nil {
return false, err
}
return false, nil
}
func addOverhead(fileName string, replayOverhead bool, replayNumber string) {
file, err := os.OpenFile(fileName, os.O_RDWR, 0644)
if err != nil {
fmt.Fprintln(os.Stderr, "Error:", err)
os.Exit(1)
}
defer file.Close()
var lines []string
scanner := bufio.NewScanner(file)
importAdded := false
for scanner.Scan() {
line := scanner.Text()
lines = append(lines, line)
if strings.Contains(line, "package main") {
lines = append(lines, "import \"advocate\"")
importAdded = true
} else if strings.Contains(line, "import \"") && !importAdded {
lines = append(lines, "import \"advocate\"")
importAdded = true
} else if strings.Contains(line, "import (") && !importAdded {
lines = append(lines, "\t\"advocate\"")
importAdded = true
}
if strings.Contains(line, "func main() {") {
if replayOverhead {
lines = append(lines, fmt.Sprintf(` // ======= Preamble Start =======
advocate.EnableReplay(%s, true)
defer advocate.WaitForReplayFinish()
// ======= Preamble End =======`, replayNumber))
} else {
lines = append(lines, ` // ======= Preamble Start =======
advocate.InitTracing(0)
defer advocate.Finish()
// ======= Preamble End =======`)
}
}
}
file.Truncate(0)
file.Seek(0, 0)
writer := bufio.NewWriter(file)
for _, line := range lines {
fmt.Fprintln(writer, line)
}
writer.Flush()
}