Fix sparse index handling, add index params.

logdog/common/archive/index.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package archive
 
 import (
         "io"
 
         "github.com/golang/protobuf/proto"
@@ skipping 11 matching lines @@
 
         sizeFunc func(proto.Message) int
 }
 
 func (i *indexBuilder) addLogEntry(le *logpb.LogEntry, offset int64) {
         // Only calculate the size if we actually use it.
         if i.ByteRange > 0 {
                 i.lastBytes += uint64(i.size(le))
         }
 
+        // Update our stream properties.

[dnj, 2016/10/17 22:12:12]

(Generate the new protobuf parameters)

+        i.index.LastPrefixIndex = le.PrefixIndex
+        i.index.LastStreamIndex = le.StreamIndex
+        i.index.LogEntryCount++
+
         // Do we index this LogEntry?
         if len(i.index.Entries) > 0 {
                 if !((i.StreamIndexRange > 0 && (le.StreamIndex-i.lastStreamIndex) >= uint64(i.StreamIndexRange)) ||
                         (i.PrefixIndexRange > 0 && (le.PrefixIndex-i.lastPrefixIndex) >= uint64(i.PrefixIndexRange)) ||
                         (i.ByteRange > 0 && i.lastBytes >= uint64(i.ByteRange))) {
                         // Not going to index this entry.
                         return
                 }
 
                 i.lastBytes = 0
@@ skipping 23 matching lines @@
         }
         return nil
 }
 
 func (i *indexBuilder) size(pb proto.Message) int {
         if f := i.sizeFunc; f != nil {
                 return f(pb)
         }
         return proto.Size(pb)
 }