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handlers.go
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handlers.go
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package main
import (
"encoding/hex"
"errors"
"fmt"
"io"
"strings"
"./binaries"
"./graph"
"./index"
"./segment"
)
var errInvalidFormat = errors.New("Invalid format")
func invalidFormat() handler {
return func(_ string, _ io.Reader) error {
return errInvalidFormat
}
}
func doPrintTo(w io.Writer) func(n string) {
return func(n string) {
fmt.Fprintln(w, n)
}
}
func doPrintBinaries(f format, w io.Writer) handler {
switch f {
case formatHex:
return doPrintHexTo(w)
case formatText:
return doPrintBinariesTo(w)
default:
return invalidFormat()
}
}
func doPrintBinariesTo(w io.Writer) handler {
return func(_ string, r io.Reader) error {
var bns binaries.Binaries
if _, err := bns.ReadFrom(r); err != nil {
return err
}
for _, g := range bns.Generations {
for _, s := range g.Segments {
for _, r := range s.References {
fmt.Fprintf(w, "%d %d %v %s %s\n", g.Generation, g.FullGeneration, g.Compacted, segmentID(s.Msb, s.Lsb), r)
}
}
}
return nil
}
}
func doPrintGraph(f format, w io.Writer) handler {
switch f {
case formatHex:
return doPrintHexTo(w)
case formatText:
return doPrintGraphTo(w)
default:
return invalidFormat()
}
}
func doPrintGraphTo(w io.Writer) handler {
return func(_ string, r io.Reader) error {
var gph graph.Graph
if _, err := gph.ReadFrom(r); err != nil {
return err
}
for _, e := range gph.Entries {
for _, r := range e.References {
fmt.Fprintf(w, "%s %s\n", segmentID(e.Msb, e.Lsb), segmentID(r.Msb, r.Lsb))
}
}
return nil
}
}
func doPrintIndex(f format, w io.Writer) handler {
switch f {
case formatHex:
return doPrintHexTo(w)
case formatText:
return doPrintIndexTo(w)
default:
return invalidFormat()
}
}
func doPrintIndexTo(w io.Writer) handler {
return func(_ string, r io.Reader) error {
var idx index.Index
if _, err := idx.ReadFrom(r); err != nil {
return err
}
for _, e := range idx.Entries {
id := segmentID(e.Msb, e.Lsb)
fmt.Fprintf(w, "%s %s %x %d %d %d %v\n", segmentType(id), id, e.Position, e.Size, e.Generation, e.FullGeneration, e.Compacted)
}
return nil
}
}
func doPrintSegmentNameTo(w io.Writer) handler {
return func(n string, _ io.Reader) error {
id := normalizeSegmentID(entryNameToSegmentID(n))
fmt.Fprintf(w, "%s %s\n", segmentType(id), id)
return nil
}
}
func doPrintSegment(f format, w io.Writer) handler {
switch f {
case formatHex:
return doPrintHexTo(w)
case formatText:
return doPrintSegmentTo(w)
default:
return invalidFormat()
}
}
func doPrintSegmentTo(w io.Writer) handler {
return func(_ string, r io.Reader) error {
var s segment.Segment
if _, err := s.ReadFrom(r); err != nil {
return err
}
fmt.Fprintf(w, "version %d\n", s.Version)
fmt.Fprintf(w, "generation %d\n", s.Generation)
fmt.Fprintf(w, "fullGeneration %d\n", s.FullGeneration)
fmt.Fprintf(w, "compacted %v\n", s.Compacted)
for i, r := range s.References {
fmt.Fprintf(w, "reference %d %s\n", i+1, segmentID(r.Msb, r.Lsb))
}
for _, r := range s.Records {
fmt.Fprintf(w, "record %x %s %x\n", r.Number, recordType(r.Type), r.Offset)
}
return nil
}
}
func doPrintNameTo(w io.Writer) handler {
return func(n string, _ io.Reader) error {
fmt.Fprintln(w, n)
return nil
}
}
func doPrintHexTo(w io.Writer) handler {
return func(_ string, r io.Reader) (err error) {
d := hex.Dumper(w)
defer d.Close()
_, err = io.Copy(d, r)
return
}
}
func isBulkSegmentID(id string) bool {
return id[16] == 'b'
}
func normalizeSegmentID(id string) string {
return strings.ToLower(strings.TrimSpace(strings.Replace(id, "-", "", -1)))
}
func recordType(t segment.RecordType) string {
switch t {
case segment.RecordTypeBlock:
return "block"
case segment.RecordTypeList:
return "list"
case segment.RecordTypeListBucket:
return "bucket"
case segment.RecordTypeMapBranch:
return "branch"
case segment.RecordTypeMapLeaf:
return "leaf"
case segment.RecordTypeNode:
return "node"
case segment.RecordTypeTemplate:
return "template"
case segment.RecordTypeValue:
return "value"
case segment.RecordTypeBlobID:
return "binary"
default:
return "unknown"
}
}
func segmentType(id string) string {
if isBulkSegmentID(id) {
return "bulk"
}
return "data"
}
func segmentID(msb, lsb uint64) string {
return fmt.Sprintf("%016x%016x", msb, lsb)
}