func (self *channelAPI) Blob_Mutation(perma grapher.PermaNode, mutation grapher.MutationNode) {
mutJson := map[string]interface{}{"perma": perma.BlobRef(), "seq": mutation.SequenceNumber(), "type": "mutation", "signer": mutation.Signer(), "entity": mutation.EntityBlobRef(), "field": mutation.Field(), "time": mutation.Time()}
switch mutation.Operation().(type) {
case []ot.StringOperation:
op := mutation.Operation().([]ot.StringOperation) // The following two lines work around a problem in GO/JSON
mutJson["op"] = &op
case []byte:
msg := json.RawMessage(mutation.Operation().([]byte))
mutJson["op"] = &msg
default:
panic("Unsupported operation kind")
}
schema, err := json.Marshal(mutJson)
if err != nil {
panic(err.String())
}
if self.bufferOnly {
self.messageBuffer = append(self.messageBuffer, string(schema))
} else {
err = self.forwardToFollowers(perma.BlobRef(), string(schema))
}
if err != nil {
log.Printf("Err Forward: %v", err)
}
}
func (self *Grapher) CreateEntityBlob(perma_blobref string, mimeType string, content []byte) (node AbstractNode, err os.Error) {
perma, e := self.permaNode(perma_blobref)
if e != nil {
err = e
return
}
c := json.RawMessage(content)
deps := perma.frontier.IDs()
entityJson := map[string]interface{}{"signer": self.userID, "perma": perma_blobref, "content": &c, "dep": deps, "mimetype": mimeType}
entityBlob, err := json.Marshal(entityJson)
if err != nil {
panic(err.String())
}
entityBlob = append([]byte(`{"type":"entity",`), entityBlob[1:]...)
log.Printf("Storing entity %v\n", string(entityBlob))
entityBlobRef := newBlobRef(entityBlob)
// Process it
var schema superSchema
schema.Type = "entity"
schema.Signer = self.userID
schema.PermaNode = perma_blobref
schema.Content = &c
schema.MimeType = mimeType
schema.Dependencies = deps
_, node, err = self.handleSchemaBlob(&schema, entityBlobRef)
return
}
func (self *Replication) getnHandlerIntern(prefix string, conn *Connection) {
channel, err := self.store.GetBlobs(prefix)
if err != nil {
log.Printf("Error while talking to store: %v\n", err)
return
}
for blob := range channel {
log.Printf("sendblob %v\n", blob.BlobRef)
conn.Send("BLOB", json.RawMessage(blob.Data))
}
}
// Called from the store when a new blob has been stored
func (self *Replication) HandleBlob(blob []byte, blobref string) os.Error {
for connection, flags := range self.connections {
if flags&connStreaming == connStreaming {
// Do not send the blob on the same connection on which it has been received
if !connection.hasReceivedBlob(blobref) {
connection.Send("BLOB", json.RawMessage(blob))
}
}
}
return nil
}
func (self *Replication) getnxHandlerIntern(prefix string, except map[string]bool, conn *Connection) {
channel, err := self.store.GetBlobs(prefix)
if err != nil {
log.Printf("Error while talking to store: %v\n", err)
return
}
for blob := range channel {
if _, ok := except[blob.BlobRef]; ok {
continue
}
conn.Send("BLOB", json.RawMessage(blob.Data))
}
}
func (self *channelAPI) Blob_Entity(perma grapher.PermaNode, entity grapher.EntityNode) {
entityJson := map[string]interface{}{"perma": perma.BlobRef(), "seq": entity.SequenceNumber(), "type": "entity", "signer": entity.Signer(), "mimetype": entity.MimeType(), "blobref": entity.BlobRef()}
msg := json.RawMessage(entity.Content())
entityJson["content"] = &msg
schema, err := json.Marshal(entityJson)
if err != nil {
panic(err.String())
}
if self.bufferOnly {
self.messageBuffer = append(self.messageBuffer, string(schema))
} else {
err = self.forwardToFollowers(perma.BlobRef(), string(schema))
}
if err != nil {
log.Printf("Err Forward: %v", err)
}
}
func (self *Message) EncodePayload(data interface{}) os.Error {
if data == nil {
self.Payload = nil
return nil
}
if raw, ok := data.(json.RawMessage); ok {
self.Payload = &raw
return nil
}
bytes, err := json.Marshal(data)
if err != nil {
return err
}
p := json.RawMessage(bytes)
self.Payload = &p
return nil
}
// Handles the 'GET' command
func (self *Replication) getHandler(msg Message) {
var blobref string
if msg.DecodePayload(&blobref) != nil {
log.Printf("Error in GET request")
return
}
blob, err := self.store.GetBlob(blobref)
if err != nil {
log.Printf("Error while talking to store: %v\n", err)
return
}
// TODO: If this is not a JSON blob ...
err = msg.connection.Send("BLOB", json.RawMessage(blob))
if err != nil {
log.Printf("Error while sending %v\n", err)
}
}
}
// PkgPath will be non-empty even for an exported type,
// so we need to check the type name as well.
return isExported(t.Name()) || t.PkgPath() == ""
}
// ----------------------------------------------------------------------------
// Server
// ----------------------------------------------------------------------------
// A value sent as a placeholder for the response when the server receives
// an invalid request.
type InvalidRequest struct{}
var invalidRequest = InvalidRequest{}
var null = json.RawMessage([]byte("null"))
type JsonRequest struct {
// A String containing the name of the method to be invoked.
Method string `json:"method"`
// An Array of objects to pass as arguments to the method.
Params *json.RawMessage `json:"params"`
// The request id. This can be of any type. It is used to match the
// response with the request that it is replying to.
Id *json.RawMessage `json:"id"`
}
type JsonResponse struct {
// The Object that was returned by the invoked method. This must be null
// in case there was an error invoking the method.
Result interface{} `json:"result"`
func (self *Grapher) CreateMutationBlob(perma_blobref string, entity_blobref string, field string, operation []byte, applyAtSeqNumber int64) (node AbstractNode, err os.Error) {
perma, e := self.permaNode(perma_blobref)
if e != nil {
err = e
return
}
entity, e := self.entity(perma.BlobRef(), entity_blobref)
if e != nil {
err = e
return
}
transformer, e := self.transformer(perma, entity, field)
if e != nil {
err = e
return
}
// Update the operation such that it can be applied after all currently applied operations
m := &mutationNode{}
m.permaBlobRef = perma_blobref
m.mutationBlobRef = "Z" // This ensures that the client mutation looses against all server mutations. The client-side must handle it the same.
m.mutationSigner = self.userID
m.entityBlobRef = entity_blobref
m.field = field
m.operation = operation
m.time = time.Seconds()
if transformer != nil {
ch, e := self.getMutationsAscending(perma.BlobRef(), entity_blobref, field, applyAtSeqNumber, perma.SequenceNumber())
if e != nil {
err = e
return
}
e = transformer.TransformClientMutation(m, ch)
if e != nil {
err = e
return
}
}
deps := perma.frontier.IDs()
mutJson := map[string]interface{}{"signer": self.userID, "perma": perma_blobref, "dep": deps, "entity": entity_blobref, "field": field}
var msg json.RawMessage
switch m.operation.(type) {
case ot.StringOperation:
op := m.operation.(ot.StringOperation) // The following two lines work around a problem in GO/JSON
op_bytes, err := op.MarshalJSON()
if err != nil {
return nil, err
}
msg = json.RawMessage(op_bytes)
case []byte:
msg = json.RawMessage(m.operation.([]byte))
default:
panic("Unsupported operation kind")
}
mutJson["op"] = &msg
schema, err := json.Marshal(mutJson)
if err != nil {
panic(err.String())
}
mutBlob := []byte(`{"type":"mutation",`)
mutBlob = append(mutBlob, schema[1:]...)
log.Printf("Storing mut %v\n", string(mutBlob))
mutBlobRef := newBlobRef(mutBlob)
// Process it
var schema2 superSchema
schema2.Type = "mutation"
schema2.Signer = self.userID
schema2.PermaNode = perma_blobref
schema2.Dependencies = deps
schema2.Entity = entity_blobref
schema2.Field = field
schema2.Operation = &msg
_, node, err = self.handleSchemaBlob(&schema2, mutBlobRef)
return
}
// Handles the 'TCHLD' command
func (self *Replication) treeHashChildrenHandler(msg Message) {
req := struct {
Prefix string "prefix"
Kind int "kind"
Children []string "chld"
}{}
var prefix string
// This is a request?
if msg.DecodePayload(&prefix) == nil {
req.Kind, req.Children, _ = self.store.HashTree().Children(prefix)
req.Prefix = prefix
msg.connection.Send("TCHLD", &req)
return
}
if msg.DecodePayload(&req) != nil {
log.Printf("Error in TCHL message")
return
}
kind1, children1, prefix := req.Kind, req.Children, req.Prefix
kind2, children2, err := self.store.HashTree().Children(prefix)
if kind1 == HashTree_NIL || kind2 == HashTree_NIL || err != nil {
log.Printf("Comparison of hash trees failed: prefix=%v, kind1=%v, kind2=%v, err=%v\n", prefix, kind1, kind2, err)
return
}
// Turn a list of strings into a map of strings for further efficient processing
map1 := map[string]bool{}
for _, ch := range children1 {
map1[ch] = true
}
map2 := map[string]bool{}
for _, ch := range children2 {
map2[ch] = true
}
if kind1 == HashTree_IDs && kind2 == HashTree_IDs {
// Both returned hashes. Compare the two sets of hashes
for key, _ := range map1 {
if _, ok := map2[key]; !ok {
msg.connection.Send("GET", key)
}
}
for key, _ := range map2 {
if _, ok := map1[key]; !ok {
blob, err := self.store.GetBlob(key)
if err != nil {
log.Printf("Retrieving block %v failed\n", key)
} else {
msg.connection.Send("BLOB", json.RawMessage(blob))
}
}
}
} else if kind1 == HashTree_InnerNodes && kind2 == HashTree_InnerNodes {
// Both returned subtree nodes? Recursion into the sub tree nodes
for i := 0; i < HashTree_NodeDegree; i++ {
if children1[i] == children2[i] {
continue
}
p := prefix + string(hextable[i])
if children1[i] == "" {
self.getnHandlerIntern(p, msg.connection)
} else if children2[i] == "" {
// Get all blobs with this prefix
msg.connection.Send("GETN", p)
} else {
// Recursion
msg.connection.Send("TCHLD", p)
}
}
} else if kind1 == HashTree_InnerNodes && kind2 == HashTree_IDs {
for i := 0; i < HashTree_NodeDegree; i++ {
// Get all blox with this prefix (except those in map1) from the other side
p := prefix + string(hextable[i])
lst := []string{}
for key, _ := range map1 {
lst = append(lst, key)
}
r := struct {
Prefix string "prefix"
Except []string "except"
}{p, lst}
msg.connection.Send("GETNX", &r)
}
} else {
for i := 0; i < HashTree_NodeDegree; i++ {
// Send all blobs with this prefix (except those in map2) to the other side
p := prefix + string(hextable[i])
self.getnxHandlerIntern(p, map2, msg.connection)
}
}
}
