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Allow exporting subset of chain

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This commit is contained in:
Taylor Gerring 2015-06-05 23:01:54 -04:00
parent 43ceb0f5c7
commit 89c9320d80
1 changed files with 14 additions and 2 deletions
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16
core/chain_manager.go
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@ -341,13 +341,25 @@ func (bc *ChainManager) ResetWithGenesisBlock(gb *types.Block) {
// Export writes the active chain to the given writer.
func (self *ChainManager) Export(w io.Writer) error {
if err := self.ExportN(w, uint64(1), self.currentBlock.NumberU64()); err != nil {
return err
}
return nil
}
// ExportN writes a subset of the active chain to the given writer.
func (self *ChainManager) ExportN(w io.Writer, first uint64, last uint64) error {
self.mu.RLock()
defer self.mu.RUnlock()
glog.V(logger.Info).Infof("exporting %v blocks...\n", self.currentBlock.Header().Number)
last := self.currentBlock.NumberU64()
if first > last {
return fmt.Errorf("export failed: first (%d) is greater than last (%d)", first, last)
}
for nr := uint64(1); nr <= last; nr++ {
glog.V(logger.Info).Infof("exporting %d blocks...\n", last-first)
for nr := first; nr <= last; nr++ {
block := self.GetBlockByNumber(nr)
if block == nil {
return fmt.Errorf("export failed on #%d: not found", nr)