// Verify that all messages are read from the event log.
func TestRead(t *testing.T) {
configureLogp()
log, err := initLog(providerName, sourceName, eventCreateMsgFile)
if err != nil {
t.Fatal(err)
}
defer func() {
err := uninstallLog(providerName, sourceName, log)
if err != nil {
t.Fatal(err)
}
}()
// Publish test messages:
for k, m := range messages {
err = log.Report(m.eventType, k, []string{m.message})
if err != nil {
t.Fatal(err)
}
}
// Read messages:
eventlog, err := newEventLogging(map[string]interface{}{"name": providerName})
if err != nil {
t.Fatal(err)
}
err = eventlog.Open(0)
if err != nil {
t.Fatal(err)
}
defer func() {
err := eventlog.Close()
if err != nil {
t.Fatal(err)
}
}()
records, err := eventlog.Read()
if err != nil {
t.Fatal(err)
}
// Validate messages:
assert.Len(t, records, len(messages))
for _, record := range records {
t.Log(record)
m, exists := messages[record.EventIdentifier.ID]
if !exists {
t.Errorf("Unknown EventId %d Read() from event log. %v", record.EventIdentifier.ID, record)
continue
}
assert.Equal(t, eventlogging.EventType(m.eventType).String(), record.Level)
assert.Equal(t, m.message, strings.TrimRight(record.Message, "\r\n"))
}
// Validate getNumberOfEventLogRecords returns the correct number of messages.
numMessages, err := eventlogging.GetNumberOfEventLogRecords(eventlogging.Handle(log.Handle))
assert.NoError(t, err)
assert.Equal(t, len(messages), int(numMessages))
}
func (l *eventLogging) Open(recordNumber uint64) error {
detailf("%s Open(recordNumber=%d) calling OpenEventLog(uncServerPath=%s, "+
"providerName=%s)", l.logPrefix, recordNumber, l.uncServerPath, l.name)
handle, err := sys.OpenEventLog(l.uncServerPath, l.name)
if err != nil {
return err
}
numRecords, err := sys.GetNumberOfEventLogRecords(handle)
if err != nil {
return err
}
var oldestRecord, newestRecord uint32
if numRecords > 0 {
l.recordNumber = uint32(recordNumber)
l.seek = true
l.ignoreFirst = true
oldestRecord, err = sys.GetOldestEventLogRecord(handle)
if err != nil {
return err
}
newestRecord = oldestRecord + numRecords - 1
if l.recordNumber < oldestRecord || l.recordNumber > newestRecord {
l.recordNumber = oldestRecord
l.ignoreFirst = false
}
} else {
l.recordNumber = 0
l.seek = false
l.ignoreFirst = false
}
logp.Info("%s contains %d records. Record number range [%d, %d]. Starting "+
"at %d (ignoringFirst=%t)", l.logPrefix, numRecords, oldestRecord,
newestRecord, l.recordNumber, l.ignoreFirst)
l.handle = handle
return nil
}