From bcfaffac240d74cd79bec3c2a9d3c144d215b495 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Sat, 22 Feb 2020 11:57:50 +0100
Subject: Added tests to the state package, and reworked the code around that

---
 state/header.go | 50 +++++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

(limited to 'state/header.go')

diff --git a/state/header.go b/state/header.go
index 3e55899..3becd5d 100644
--- a/state/header.go
+++ b/state/header.go
@@ -1,57 +1,57 @@
 package state
 
 import (
+	"bareos-zabbix-check/utils"
 	"bytes"
 	"encoding/binary"
 	"fmt"
-	"log"
-	"os"
+	"io"
+
+	"github.com/pkg/errors"
 )
 
 // c.StateFile()HeaderLength : the length of the state file header struct
-const headerLength = 14 + 2 + 4 + 4 + 8 + 8 + 19*8
+const headerLength = 14 + 2 + 4 + 4 + 8 + 8 // + 19*8
 
-// header : A structure to hold the header of the state file. It is statically aligned for amd64 architecture
+// Header is a structure to hold the header of the state file. It is statically aligned for amd64 architecture
 // This comes from bareos repository file core/src/lib/bsys.cc:525 and core/src/lib/bsys.cc:652
-type header struct {
+type Header struct {
 	ID                        [14]byte
 	_                         int16
 	Version                   int32
 	_                         int32
 	LastJobsAddr              uint64
 	EndOfRecentJobResultsList uint64
-	Reserved                  [19]uint64
+	//Reserved                  [19]uint64
 }
 
-func (sfh header) String() string {
-	return fmt.Sprintf("ID: \"%s\", Version: %d, LastJobsAddr: %d, EndOfRecentJobResultsList: %d", sfh.ID[:len(sfh.ID)-2], sfh.Version, sfh.EndOfRecentJobResultsList, sfh.Reserved)
+func (sfh *Header) String() string {
+	return fmt.Sprintf("ID: \"%s\", Version: %d, LastJobsAddr: %d, EndOfRecentJobResultsList: %d",
+		string(sfh.ID[:utils.Clen(sfh.ID[:])]), sfh.Version, sfh.LastJobsAddr, sfh.EndOfRecentJobResultsList)
 }
 
-func (s *State) parseHeader(file *os.File) (err error) {
+// ParseHeader parses a Header struct
+func ParseHeader(handle io.Reader) (h *Header, err error) {
 	// Parsing the state file header
-	n, data, err := s.readNextBytes(file, headerLength)
+	data := make([]byte, headerLength)
+	n, err := handle.Read(data)
 	if err != nil {
-		return fmt.Errorf("INFO Corrupted state file : %s", err)
+		return nil, errors.Wrap(err, "Corrupted state file")
 	}
 	if n != headerLength {
-		return fmt.Errorf("INFO Corrupted state file : invalid header length in %s", s.config.StateFile())
+		return nil, fmt.Errorf("Corrupted state file : invalid header length")
 	}
 	buffer := bytes.NewBuffer(data)
-	err = binary.Read(buffer, binary.LittleEndian, &s.header)
-	if err != nil {
-		return fmt.Errorf("INFO Corrupted state file : binary.Read failed on header in %s : %s", s.config.StateFile(), err)
-	}
-	if s.config.Verbose() {
-		log.Printf("Parsed header: %+s\n", s.header)
-	}
-	if id := string(s.header.ID[:len(s.header.ID)-1]); id != "Bareos State\n" && id != "Bacula State\n" {
-		return fmt.Errorf("INFO Corrupted state file : Not a bareos or bacula state file %s", s.config.StateFile())
+	h = &Header{}
+	_ = binary.Read(buffer, binary.LittleEndian, h) // this call cannot fail since we checked the header length
+	if id := string(h.ID[:utils.Clen(h.ID[:])]); id != "Bareos State\n" && id != "Bacula State\n" {
+		return nil, fmt.Errorf("Corrupted state file : Not a bareos or bacula state file : %s", id)
 	}
-	if s.header.Version != 4 {
-		return fmt.Errorf("INFO Invalid state file : This script only supports bareos state file version 4, got %d", s.header.Version)
+	if h.Version != 4 {
+		return nil, fmt.Errorf("Invalid state file : This script only supports bareos state file version 4, got %d", h.Version)
 	}
-	if s.header.LastJobsAddr == 0 {
-		return fmt.Errorf("INFO No jobs exist in the state file")
+	if h.LastJobsAddr == 0 {
+		return nil, fmt.Errorf("No jobs exist in the state file")
 	}
 	return
 }
-- 
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