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index.go
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index.go
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package crdt
import (
"fmt"
"io"
"io/ioutil"
"github.com/johnny-morrice/godless/crypto"
"github.com/johnny-morrice/godless/log"
"github.com/johnny-morrice/godless/proto"
"github.com/pkg/errors"
pb "github.com/gogo/protobuf/proto"
)
type Index struct {
Index map[TableName][]Link
}
func EmptyIndex() Index {
return MakeIndex(map[TableName]Link{})
}
func MakeIndex(indices map[TableName]Link) Index {
out := Index{
Index: map[TableName][]Link{},
}
for table, addr := range indices {
out.Index[table] = []Link{addr}
}
return out
}
func EncodeIndex(index Index, w io.Writer) ([]InvalidIndexEntry, error) {
const failMsg = "EncodeIndex failed"
message, invalid := MakeIndexMessage(index)
invalidCount := len(invalid)
if invalidCount > 0 {
log.Error("EncodeIndex: %d invalid entries", invalidCount)
}
bs, err := pb.Marshal(message)
if err != nil {
return invalid, errors.Wrap(err, failMsg)
}
var written int
written, err = w.Write(bs)
if err != nil {
return invalid, errors.Wrap(err, fmt.Sprintf("%s after %d bytes", failMsg, written))
}
return invalid, nil
}
func DecodeIndex(r io.Reader) (Index, []InvalidIndexEntry, error) {
const failMsg = "DecodeIndex failed"
message := &proto.IndexMessage{}
bs, err := ioutil.ReadAll(r)
if err != nil {
return __EMPTY_INDEX, nil, errors.Wrap(err, failMsg)
}
err = pb.Unmarshal(bs, message)
if err != nil {
return __EMPTY_INDEX, nil, errors.Wrap(err, failMsg)
}
index, invalid := ReadIndexMessage(message)
return index, invalid, nil
}
func ReadIndexMessage(message *proto.IndexMessage) (Index, []InvalidIndexEntry) {
stream := ReadIndexStreamMessage(message)
return ReadIndexStream(stream)
}
func MakeIndexMessage(index Index) (*proto.IndexMessage, []InvalidIndexEntry) {
stream, invalid := MakeIndexStream(index)
return MakeIndexStreamMessage(stream), invalid
}
func (index Index) IsEmpty() bool {
return len(index.Index) == 0
}
func (index Index) ForTable(tableName TableName, f func(link Link)) error {
const failMsg = "index.ForTable failed"
links, err := index.GetTableAddrs(tableName)
if err != nil {
return errors.Wrap(err, failMsg)
}
for _, l := range links {
f(l)
}
return nil
}
func (index Index) JoinIndex(other Index) Index {
cpy := index.Copy()
for table, addrs := range other.Index {
cpy.addTable(table, addrs...)
}
return cpy
}
func (index Index) addStreamEntry(entry IndexStreamEntry) error {
const failMsg = "joinStreamEntry failed"
if crypto.IsNilSignature(entry.Signature) {
index.addTable(entry.TableName, UnsignedLink(entry.Link))
return nil
}
sig, err := crypto.ParseSignature(entry.Signature)
if err != nil {
return errors.Wrap(err, failMsg)
}
link := PresignedLink(entry.Link, []crypto.Signature{sig})
index.addTable(entry.TableName, link)
return nil
}
// Equals does not take into account any invalid signatures.
func (index Index) Equals(other Index) bool {
if len(index.Index) != len(other.Index) {
return false
}
indexTables := index.AllTables()
for _, tableName := range indexTables {
myLinks := index.Index[tableName]
theirLinks, present := other.Index[tableName]
if !present {
return false
}
if len(myLinks) != len(theirLinks) {
return false
}
for i, mine := range myLinks {
theirs := theirLinks[i]
if !mine.Equals(theirs) {
return false
}
}
}
return true
}
func (index Index) AllTables() []TableName {
tables := make([]TableName, 0, len(index.Index))
for name := range index.Index {
tables = append(tables, name)
}
return tables
}
func (index Index) GetTableAddrs(tableName TableName) ([]Link, error) {
indices, ok := index.Index[tableName]
if !ok {
return nil, fmt.Errorf("No table in index: '%s'", tableName)
}
return indices, nil
}
func (index Index) JoinNamespace(addr Link, namespace Namespace) Index {
tables := namespace.GetTableNames()
joined := index.Copy()
for _, t := range tables {
joined.addTable(t, addr)
}
return joined
}
func (index Index) JoinTable(table TableName, addr ...Link) Index {
cpy := index.Copy()
cpy.addTable(table, addr...)
return cpy
}
func (index Index) addTable(table TableName, addr ...Link) {
if addrs, ok := index.Index[table]; ok {
normal := MergeLinks(append(addrs, addr...))
index.Index[table] = normal
} else {
index.Index[table] = MergeLinks(addr)
}
}
func (index Index) Copy() Index {
cpy := EmptyIndex()
for table, addrs := range index.Index {
addrCopy := make([]Link, len(addrs))
for i, a := range addrs {
addrCopy[i] = a
}
cpy.Index[table] = addrCopy
}
return cpy
}
var __EMPTY_INDEX Index