Cscli Explain Stdin
Allow `cscli explain` to rely on stdin
package main
import (
+ "bufio"
"fmt"
+ "io"
"os"
"os/exec"
"path/filepath"
@@ -19,6 +21,7 @@ func NewExplainCmd() *cobra.Command {
var logLine string
var logType string
var opts cstest.DumpOpts
+ var err error
var cmdExplain = &cobra.Command{
Use: "explain",
@@ -30,10 +33,12 @@ Explain log pipeline
cscli explain --file ./myfile.log --type nginx
cscli explain --log "Sep 19 18:33:22 scw-d95986 sshd[24347]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=1.2.3.4" --type syslog
cscli explain --dsn "file://myfile.log" --type nginx
+tail -n 5 myfile.log | cscli explain --type nginx -f -
`,
Args: cobra.ExactArgs(0),
DisableAutoGenTag: true,
Run: func(cmd *cobra.Command, args []string) {
+ fileInfo, _ := os.Stdin.Stat()
if logType == "" || (logLine == "" && logFile == "" && dsn == "") {
printHelp(cmd)
@@ -42,22 +47,47 @@ cscli explain --dsn "file://myfile.log" --type nginx
os.Exit(1)
}
+ if logFile == "-" && ((fileInfo.Mode() & os.ModeCharDevice) == os.ModeCharDevice) {
+ log.Fatal("-f - is intended to work with pipes.")
+ }
+
var f *os.File
dir := os.TempDir()
- // we create a temporary log file if a log line has been provided
- if logLine != "" {
- logFile = filepath.Join(dir, "cscli_test_tmp.log")
- f, err := os.Create(logFile) // nolint: govet
+ tmpFile := ""
+ // we create a temporary log file if a log line/stdin has been provided
+ if logLine != "" || logFile == "-" {
+ tmpFile = filepath.Join(dir, "cscli_test_tmp.log")
+ f, err = os.Create(tmpFile)
if err != nil {
log.Fatal(err)
}
- defer f.Close()
+ if logLine != "" {
_, err = f.WriteString(logLine)
if err != nil {
log.Fatal(err)
}
+ } else if logFile == "-" {
+ reader := bufio.NewReader(os.Stdin)
+ errCount := 0
+ for {
+ input, err := reader.ReadBytes('\n')
+ if err != nil && err == io.EOF {
+ break
+ }
+ _, err = f.Write(input)
+ if err != nil {
+ errCount++
+ }
+ }
+ if errCount > 0 {
+ log.Warnf("Failed to write %d lines to tmp file", errCount)
+ }
+ }
+ f.Close()
+ //this is the file that was going to be read by crowdsec anyway
+ logFile = tmpFile
}
if logFile != "" {
@@ -85,11 +115,10 @@ cscli explain --dsn "file://myfile.log" --type nginx
log.Fatalf("fail to run crowdsec for test: %v", err)
}
- // rm the temporary log file if only a log line was provided
- if logLine != "" {
- f.Close()
- if err := os.Remove(logFile); err != nil {
- log.Fatalf("unable to remove tmp log file '%s': %+v", logFile, err)
+ // rm the temporary log file if only a log line/stdin was provided
+ if tmpFile != "" {
+ if err := os.Remove(tmpFile); err != nil {
+ log.Fatalf("unable to remove tmp log file '%s': %+v", tmpFile, err)
}
}
parserDumpFile := filepath.Join(dir, cstest.ParserResultFileName)
