backend: store lastLines for run

Author: Yevgeny Pats

client/agent.go

@@ -27,6 +27,8 @@ const (
 	AgentNoPermissionError = 22
 )
 
+var lastLines []string
+
 func appendPrefixToCmd(cmd *exec.Cmd) error {
 	stderr, err := cmd.StderrPipe()
 	if err != nil {
@@ -42,6 +44,10 @@ func appendPrefixToCmd(cmd *exec.Cmd) error {
 		for scanner.Scan() {
 			msg := scanner.Text()
 			fmt.Printf("FUZZER: %s\n", msg)
+			lastLines = append(lastLines, msg)
+			if len(lastLines) > 1000 {
+				lastLines = lastLines[500:]
+			}
 		}
 	}()
 

client/client.go

@@ -46,6 +46,7 @@ type crash struct {
 	Type       string    `firestore:"type"`
 	Time       time.Time `firestore:"time,serverTimestamp"`
 	V2         bool      `firestore:"v2"`
+	LastLines  string    `firestore:"last_lines"`
 }
 
 type FuzzitClient struct {

client/libfuzzer.go

@@ -122,6 +122,7 @@ func (c *FuzzitClient) uploadCrash(exitCode int) error {
 			OrgId:      c.Org,
 			ExitCode:   uint32(exitCode),
 			Type:       "crash",
+			LastLines:  strings.Join(lastLines, "\n"),
 			V2:         true,
 		})
 		if err != nil {

client/utils.go

@@ -202,3 +202,12 @@ func createDirIfNotExist(path string) error {
 	}
 	return nil
 }
+
+func Contains(arr []string, str string) bool {
+	for _, a := range arr {
+		if a == str {
+			return true
+		}
+	}
+	return false
+}