Updated for go 1.16 modules

pkg/state/job.go

@@ -0,0 +1,96 @@
+package state
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"regexp"
+	"time"
+
+	"git.adyxax.org/adyxax/bareos-zabbix-check/pkg/job"
+	"git.adyxax.org/adyxax/bareos-zabbix-check/pkg/utils"
+	"github.com/pkg/errors"
+)
+
+// maxnameLength : the maximum length of a job name, hardcoded in bareos
+const maxNameLength = 128
+
+// jobLength : the length of the job result struct
+const jobLength = 16 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 8 + 8 + 8 + maxNameLength
+
+var jobNameRegex = regexp.MustCompilePOSIX(`^([-A-Za-z0-9_]+)\.[0-9]{4}-[0-9]{2}-[0-9]{2}.*`)
+
+// jobEntry : A structure to hold a job result from the state file
+// This comes from bareos repository file core/src/lib/recent_job_results_list.h:29 and file core/src/lib/recent_job_results_list.cc:44
+type jobEntry struct {
+	_              [16]byte
+	Errors         int32
+	JobType        int32
+	JobStatus      int32
+	JobLevel       int32
+	JobID          uint32
+	VolSessionID   uint32
+	VolSessionTime uint32
+	JobFiles       uint32
+	JobBytes       uint64
+	StartTime      uint64
+	EndTime        uint64
+	Job            [maxNameLength]byte
+}
+
+func (je jobEntry) String() string {
+	var matches = jobNameRegex.FindSubmatchIndex(je.Job[:])
+	jobNameLen := utils.Clen(je.Job[:])
+	if len(matches) >= 4 {
+		jobNameLen = matches[3]
+	}
+	return fmt.Sprintf("Errors: %d, JobType: %c, JobStatus: %c, JobLevel: %c, JobID: %d, VolSessionID: %d, VolSessionTime: %d, JobFiles: %d, JobBytes: %d, StartTime: %s, EndTime: %s, Job: %s",
+		je.Errors, je.JobType, je.JobStatus, je.JobLevel, je.JobID, je.VolSessionID, je.VolSessionTime, je.JobFiles, je.JobBytes, time.Unix(int64(je.StartTime), 0), time.Unix(int64(je.EndTime), 0), je.Job[:jobNameLen])
+}
+
+// ParseJobs parses the jobs in a state file
+func ParseJobs(handle io.Reader) (jobs []job.Job, err error) {
+	// We read how many jobs there are in the state file
+	data := make([]byte, 4)
+	n, err := handle.Read(data)
+	if err != nil {
+		return nil, errors.Wrap(err, "Corrupted state file")
+	}
+	if n != 4 {
+		return nil, fmt.Errorf("Corrupted state file : invalid numberOfJobs read length")
+	}
+	buffer := bytes.NewBuffer(data)
+	var numberOfJobs uint32
+	_ = binary.Read(buffer, binary.LittleEndian, &numberOfJobs) // this call cannot fail since we checked the header length
+
+	// We parse the job entries
+	for ; numberOfJobs > 0; numberOfJobs-- {
+		var (
+			jobResult jobEntry
+			jobName   string
+		)
+		data := make([]byte, jobLength)
+		n, err = handle.Read(data)
+		if err != nil {
+			return nil, errors.Wrap(err, "Corrupted state file")
+		}
+		if n != jobLength {
+			return nil, fmt.Errorf("Corrupted state file : invalid job entry")
+		}
+		buffer = bytes.NewBuffer(data)
+		_ = binary.Read(buffer, binary.LittleEndian, &jobResult) // this call cannot fail since we checked the header length
+		matches := jobNameRegex.FindSubmatchIndex(jobResult.Job[:])
+		if len(matches) >= 4 {
+			jobName = string(jobResult.Job[:matches[3]])
+		} else {
+			return nil, fmt.Errorf("Couldn't parse job name, this shouldn't happen : %s", jobResult.Job[:])
+		}
+		// If the job is of type backup (B == ascii 66)
+		if jobResult.JobType == 66 {
+			// If the job is of status success JobStatus is equals to 84 (T == ascii 84)
+			jobs = append(jobs, job.Job{Name: jobName, Timestamp: jobResult.StartTime, Success: jobResult.JobStatus == 84})
+		}
+	}
+	return
+}