func (c *conn) readResponses() {
defer c.close()
for {
r, err := c.readR()
if err != nil {
c.clk.Lock()
if c.err == nil {
c.err = err
}
c.clk.Unlock()
return
}
if r.ErrCode != nil && *r.ErrCode == proto.Response_REDIRECT {
c.redirectAddr = pb.GetString(r.ErrDetail)
c.redirected = true
}
tag := pb.GetInt32(r.Tag)
flags := pb.GetInt32(r.Flags)
c.cblk.Lock()
ch, ok := c.cb[tag]
if ok && ch == nil {
c.cblk.Unlock()
continue
}
if flags&Done != 0 {
c.cb[tag] = nil, false
}
c.cblk.Unlock()
if !ok {
log.Printf(
"%v unexpected: tag=%d flags=%d rev=%d path=%q value=%v len=%d err_code=%v err_detail=%q",
ch,
tag,
flags,
pb.GetInt64(r.Rev),
pb.GetString(r.Path),
r.Value,
pb.GetInt32(r.Len),
pb.GetInt32((*int32)(r.ErrCode)),
pb.GetString(r.ErrDetail),
)
continue
}
if flags&Valid != 0 {
ch <- r
}
if flags&Done != 0 {
close(ch)
}
}
}
func (c *conn) getdir(t *T, tx txn) {
path := pb.GetString(t.Path)
if g := c.getterFor(t); g != nil {
ents, rev := g.Get(path)
if rev == store.Missing {
c.respond(t, Valid|Done, nil, noEnt)
return
}
if rev != store.Dir {
c.respond(t, Valid|Done, nil, notDir)
return
}
sort.SortStrings(ents)
offset := int(pb.GetInt32(t.Offset))
if offset < 0 || offset >= len(ents) {
c.respond(t, Valid|Done, nil, erange)
return
}
e := ents[offset]
c.respond(t, Valid|Done, tx.cancel, &R{Path: &e})
}
}
func (c *conn) walk(t *T, tx txn) {
pat := pb.GetString(t.Path)
glob, err := store.CompileGlob(pat)
if err != nil {
c.respond(t, Valid|Done, nil, errResponse(err))
return
}
offset := pb.GetInt32(t.Offset)
if offset < 0 {
c.respond(t, Valid|Done, nil, erange)
return
}
if g := c.getterFor(t); g != nil {
var r R
f := func(path, body string, rev int64) (stop bool) {
if offset == 0 {
r.Path = &path
r.Value = []byte(body)
r.Rev = &rev
return true
}
offset--
return false
}
if store.Walk(g, glob, f) {
c.respond(t, Set|Valid|Done, nil, &r)
} else {
c.respond(t, Valid|Done, nil, erange)
}
}
}
func (c *conn) events(t *T) (*Watch, os.Error) {
cb, err := c.send(t)
if err != nil {
return nil, err
}
evs := make(chan *Event)
w := &Watch{evs, c, cb, *t.Tag}
go func() {
for r := range cb {
var ev Event
if err := r.err(); err != nil {
ev.Err = err
} else {
ev.Rev = pb.GetInt64(r.Rev)
ev.Path = pb.GetString(r.Path)
ev.Body = r.Value
ev.Flag = pb.GetInt32(r.Flags)
}
evs <- &ev
}
close(evs)
}()
return w, nil
}
// referenceValueToKey is the same as protoToKey except the input is a
// PropertyValue_ReferenceValue instead of a Reference.
func referenceValueToKey(r *pb.PropertyValue_ReferenceValue) (k *Key, err error) {
appID := proto.GetString(r.App)
for _, e := range r.Pathelement {
k = &Key{
kind: proto.GetString(e.Type),
stringID: proto.GetString(e.Name),
intID: proto.GetInt64(e.Id),
parent: k,
appID: appID,
}
if !k.valid() {
return nil, ErrInvalidKey
}
}
return
}
func (c *conn) watch(t *T, tx txn) {
pat := pb.GetString(t.Path)
glob, err := store.CompileGlob(pat)
if err != nil {
c.respond(t, Valid|Done, nil, errResponse(err))
return
}
var w *store.Watch
rev := pb.GetInt64(t.Rev)
if rev == 0 {
w, err = store.NewWatch(c.s.St, glob), nil
} else {
w, err = store.NewWatchFrom(c.s.St, glob, rev)
}
switch err {
case nil:
// nothing
case store.ErrTooLate:
c.respond(t, Valid|Done, nil, tooLate)
default:
c.respond(t, Valid|Done, nil, errResponse(err))
}
go func() {
defer w.Stop()
// TODO buffer (and possibly discard) events
for {
select {
case ev := <-w.C:
if closed(w.C) {
return
}
r := R{
Path: &ev.Path,
Value: []byte(ev.Body),
Rev: &ev.Seqn,
}
var flag int32
switch {
case ev.IsSet():
flag = Set
case ev.IsDel():
flag = Del
}
c.respond(t, Valid|flag, tx.cancel, &r)
case <-tx.cancel:
c.closeTxn(*t.Tag)
return
}
}
}()
}
// Create creates a channel and returns a token for use by the client.
// The clientID is an appication-provided string used to identify the client.
func Create(c appengine.Context, clientID string) (token string, err error) {
req := &channel_proto.CreateChannelRequest{
ApplicationKey: &clientID,
}
resp := &channel_proto.CreateChannelResponse{}
err = c.Call(service, "CreateChannel", req, resp, nil)
token = proto.GetString(resp.ClientId)
return
}
// loadMapEntry converts a Property into an entry of an existing Map,
// or into an element of a slice-valued Map entry.
func loadMapEntry(m Map, k *Key, p *pb.Property) os.Error {
var (
result interface{}
sliceType reflect.Type
)
switch {
case p.Value.Int64Value != nil:
if p.Meaning != nil && *p.Meaning == pb.Property_GD_WHEN {
result = Time(*p.Value.Int64Value)
sliceType = reflect.TypeOf([]Time(nil))
} else {
result = *p.Value.Int64Value
sliceType = reflect.TypeOf([]int64(nil))
}
case p.Value.BooleanValue != nil:
result = *p.Value.BooleanValue
sliceType = reflect.TypeOf([]bool(nil))
case p.Value.StringValue != nil:
if p.Meaning != nil && *p.Meaning == pb.Property_BLOB {
result = []byte(*p.Value.StringValue)
sliceType = reflect.TypeOf([][]byte(nil))
} else if p.Meaning != nil && *p.Meaning == pb.Property_BLOBKEY {
result = appengine.BlobKey(*p.Value.StringValue)
sliceType = reflect.TypeOf([]appengine.BlobKey(nil))
} else {
result = *p.Value.StringValue
sliceType = reflect.TypeOf([]string(nil))
}
case p.Value.DoubleValue != nil:
result = *p.Value.DoubleValue
sliceType = reflect.TypeOf([]float64(nil))
case p.Value.Referencevalue != nil:
key, err := referenceValueToKey(p.Value.Referencevalue)
if err != nil {
return err
}
result = key
sliceType = reflect.TypeOf([]*Key(nil))
default:
return nil
}
name := proto.GetString(p.Name)
if proto.GetBool(p.Multiple) {
var s reflect.Value
if x := m[name]; x != nil {
s = reflect.ValueOf(x)
} else {
s = reflect.MakeSlice(sliceType, 0, 0)
}
s = reflect.Append(s, reflect.ValueOf(result))
m[name] = s.Interface()
} else {
m[name] = result
}
return nil
}
func (c *CheckResult) stringMap() (smap map[string]string) {
smap = map[string]string{
"Hostname": fmt.Sprintf("%s", proto.GetString(c.Hostname)),
"ServiceName": fmt.Sprintf("%s", proto.GetString(c.ServiceName)),
"Status": fmt.Sprintf("%d", int32((*c.Status))),
"CheckPassive": fmt.Sprintf("%d", func() (i int32) {
if proto.GetBool(c.CheckPassive) {
i = 1
} else {
i = 0
}
return i
}()),
"CheckOutput": fmt.Sprintf("%s", strings.Trim(strconv.Quote(proto.GetString(c.CheckOutput)), "\"")),
"StartTimestamp": fmt.Sprintf("%f", float64(proto.GetInt64(c.StartTimestamp))/1000000000),
"EndTimestamp": fmt.Sprintf("%f", float64(proto.GetInt64(c.EndTimestamp))/1000000000),
"TimeNow": fmt.Sprintf("%d", time.Seconds()),
}
return smap
}
// protoToRecord converts a RequestLog, the internal Protocol Buffer
// representation of a single request-level log, to a Record, its
// corresponding external representation.
func protoToRecord(rl *log_proto.RequestLog) *Record {
return &Record{
AppID: *rl.AppId,
VersionID: *rl.VersionId,
RequestID: *rl.RequestId,
IP: *rl.Ip,
Nickname: proto.GetString(rl.Nickname),
StartTime: *rl.StartTime,
EndTime: *rl.EndTime,
Latency: *rl.Latency,
MCycles: *rl.Mcycles,
Method: *rl.Method,
Resource: *rl.Resource,
HTTPVersion: *rl.HttpVersion,
Status: *rl.Status,
ResponseSize: *rl.ResponseSize,
Referrer: proto.GetString(rl.Referrer),
UserAgent: proto.GetString(rl.UserAgent),
URLMapEntry: *rl.UrlMapEntry,
Combined: *rl.Combined,
APIMCycles: proto.GetInt64(rl.ApiMcycles),
Host: proto.GetString(rl.Host),
Cost: proto.GetFloat64(rl.Cost),
TaskQueueName: proto.GetString(rl.TaskQueueName),
TaskName: proto.GetString(rl.TaskName),
WasLoadingRequest: proto.GetBool(rl.WasLoadingRequest),
PendingTime: proto.GetInt64(rl.PendingTime),
Finished: proto.GetBool(rl.Finished),
AppLogs: protoToAppLogs(rl.Line),
}
}
// loadStruct converts an EntityProto into an existing struct.
// It returns an error if the destination struct is unable to hold the entity.
func loadStruct(sv reflect.Value, k *Key, e *pb.EntityProto) os.Error {
var fieldName, reason string
for _, p := range e.Property {
if errStr := loadStructField(sv, p); errStr != "" {
fieldName, reason = proto.GetString(p.Name), errStr
}
}
for _, p := range e.RawProperty {
if errStr := loadStructField(sv, p); errStr != "" {
fieldName, reason = proto.GetString(p.Name), errStr
}
}
if reason != "" {
return &ErrFieldMismatch{
Key: k,
StructType: sv.Type(),
FieldName: fieldName,
Reason: reason,
}
}
return nil
}
func (c *conn) getdir(t *T, tx txn) {
path := pb.GetString(t.Path)
if g := c.getterFor(t); g != nil {
go func() {
ents, rev := g.Get(path)
if rev == store.Missing {
c.respond(t, Valid|Done, nil, noEnt)
return
}
if rev != store.Dir {
c.respond(t, Valid|Done, nil, notDir)
return
}
offset := int(pb.GetInt32(t.Offset))
limit := int(pb.GetInt32(t.Limit))
if limit <= 0 {
limit = len(ents)
}
if offset < 0 {
offset = 0
}
end := offset + limit
if end > len(ents) {
end = len(ents)
}
for _, e := range ents[offset:end] {
select {
case <-tx.cancel:
c.closeTxn(*t.Tag)
return
default:
}
c.respond(t, Valid, tx.cancel, &R{Path: &e})
}
c.respond(t, Done, nil, &R{})
}()
}
}
func (c *conn) get(t *T, tx txn) {
if g := c.getterFor(t); g != nil {
v, rev := g.Get(pb.GetString(t.Path))
if rev == store.Dir {
c.respond(t, Valid|Done, nil, isDir)
return
}
var r R
r.Rev = &rev
if len(v) == 1 { // not missing
r.Value = []byte(v[0])
}
c.respond(t, Valid|Done, nil, &r)
}
}
func (c *conn) walk(t *T, tx txn) {
pat := pb.GetString(t.Path)
glob, err := store.CompileGlob(pat)
if err != nil {
c.respond(t, Valid|Done, nil, errResponse(err))
return
}
offset := pb.GetInt32(t.Offset)
var limit int32 = math.MaxInt32
if t.Limit != nil {
limit = pb.GetInt32(t.Limit)
}
if g := c.getterFor(t); g != nil {
go func() {
f := func(path, body string, rev int64) (stop bool) {
select {
case <-tx.cancel:
c.closeTxn(*t.Tag)
return true
default:
}
if offset <= 0 && limit > 0 {
var r R
r.Path = &path
r.Value = []byte(body)
r.Rev = &rev
c.respond(t, Valid|Set, tx.cancel, &r)
limit--
}
offset--
return false
}
stopped := store.Walk(g, glob, f)
if !stopped {
c.respond(t, Done, nil, &R{})
}
}()
}
}
func (c *conn) wait(t *T, tx txn) {
pat := pb.GetString(t.Path)
glob, err := store.CompileGlob(pat)
if err != nil {
c.respond(t, Valid|Done, nil, errResponse(err))
return
}
var w *store.Watch
rev := pb.GetInt64(t.Rev)
if rev == 0 {
w, err = store.NewWatch(c.s.St, glob), nil
} else {
w, err = store.NewWatchFrom(c.s.St, glob, rev)
}
switch err {
case nil:
// nothing
case store.ErrTooLate:
c.respond(t, Valid|Done, nil, tooLate)
default:
c.respond(t, Valid|Done, nil, errResponse(err))
}
go func() {
defer w.Stop()
ev := <-w.C
r := R{
Path: &ev.Path,
Value: []byte(ev.Body),
Rev: &ev.Seqn,
}
var flag int32
switch {
case ev.IsSet():
flag = Set
case ev.IsDel():
flag = Del
}
c.respond(t, Valid|flag, nil, &r)
}()
}
func (t *txn) stat() {
if t.c.access == false {
t.respondOsError(os.EACCES)
return
}
go func() {
g, err := t.getter()
if err != nil {
t.respondOsError(err)
return
}
len, rev := g.Stat(proto.GetString(t.req.Path))
t.resp.Len = &len
t.resp.Rev = &rev
t.respond()
}()
}
// Receives messages from remote client and acts upon them if appropriate.
func (cl *client) RecvLoop(cs chan<- Msg) {
defer logAndClose(cl.conn)
for {
msg, err := readMessage(cl.conn)
if err != nil {
// Remove client if something went wrong
cs <- removeClientMsg{cl, "Reading message from client failed: " + err.String()}
return
}
switch *msg.Type {
case protocol.Message_Type(protocol.Message_DISCONNECT):
cs <- removeClientMsg{cl, proto.GetString(msg.Disconnect.ReasonStr)}
return
default:
// TODO: If no proper avatar has been started, this will block, fix?
// We could check cl.avatar for nil
cl.RecvQueue <- msg // Forward to avatar
}
}
}
func main() {
flag.Usage = usage
flag.Parse()
if *helpShort || *helpLong || flag.NArg() == 0 {
flag.Usage()
os.Exit(1)
}
fds, err := parser.ParseFiles(flag.Args(), strings.Split(*importPath, ",", -1))
if err != nil {
log.Exitf("Failed parsing: %v", err)
}
resolver.ResolveSymbols(fds)
fmt.Println("-----")
proto.MarshalText(os.Stdout, fds)
fmt.Println("-----")
// Find plugin.
pluginPath := fullPath(*pluginBinary, strings.Split(os.Getenv("PATH"), ":", -1))
if pluginPath == "" {
log.Exitf("Failed finding plugin binary %q", *pluginBinary)
}
// Start plugin subprocess.
pluginIn, meOut, err := os.Pipe()
if err != nil {
log.Exitf("Failed creating pipe: %v", err)
}
meIn, pluginOut, err := os.Pipe()
if err != nil {
log.Exitf("Failed creating pipe: %v", err)
}
pid, err := os.ForkExec(pluginPath, nil, nil, "/", []*os.File{pluginIn, pluginOut, os.Stderr})
if err != nil {
log.Exitf("Failed forking plugin: %v", err)
}
pluginIn.Close()
pluginOut.Close()
// Send request.
cgRequest := &plugin.CodeGeneratorRequest{
FileToGenerate: flag.Args(),
// TODO: proto_file should be topologically sorted (bottom-up)
ProtoFile: fds.File,
}
buf, err := proto.Marshal(cgRequest)
if err != nil {
log.Exitf("Failed marshaling CG request: %v", err)
}
_, err = meOut.Write(buf)
if err != nil {
log.Exitf("Failed writing CG request: %v", err)
}
meOut.Close()
w, err := os.Wait(pid, 0)
if err != nil {
log.Exitf("Failed waiting for plugin: %v", err)
}
if w.ExitStatus() != 0 {
log.Exitf("Plugin exited with status %d", w.ExitStatus())
}
// Read response.
cgResponse := new(plugin.CodeGeneratorResponse)
if buf, err = ioutil.ReadAll(meIn); err != nil {
log.Exitf("Failed reading CG response: %v", err)
}
if err = proto.Unmarshal(buf, cgResponse); err != nil {
log.Exitf("Failed unmarshaling CG response: %v", err)
}
// TODO: check cgResponse.Error
// TODO: write files
for _, f := range cgResponse.File {
fmt.Printf("--[ %v ]--\n", proto.GetString(f.Name))
fmt.Println(proto.GetString(f.Content))
}
fmt.Println("-----")
}
func newError(t *txn) *Error {
return &Error{
Err: *t.resp.ErrCode,
Detail: proto.GetString(t.resp.ErrDetail),
}
}
// loadStructField converts a Property into a field of an existing struct,
// or into an element of a slice-typed struct field.
// It returns an error message, or "" for success.
func loadStructField(sv reflect.Value, p *pb.Property) string {
fieldName := proto.GetString(p.Name)
v := sv.FieldByName(fieldName)
if !v.IsValid() {
return "no such struct field"
}
if unexported(fieldName) {
return "unexported struct field"
}
var slice reflect.Value
if proto.GetBool(p.Multiple) {
if v.Kind() != reflect.Slice {
return "multiple-valued property requires a slice field type"
}
if v.Len() > maxSliceFieldLen-1 {
return "slice is too long"
}
slice = v
v = reflect.New(v.Type().Elem()).Elem()
}
switch v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if p.Value.Int64Value == nil {
return typeMismatchReason(p, v)
}
x := *p.Value.Int64Value
if v.OverflowInt(x) {
return fmt.Sprintf("value %v overflows struct field of type %v", x, v.Type())
}
v.SetInt(x)
case reflect.Bool:
if p.Value.BooleanValue == nil {
return typeMismatchReason(p, v)
}
v.SetBool(*p.Value.BooleanValue)
case reflect.String:
if p.Value.StringValue == nil {
return typeMismatchReason(p, v)
}
v.SetString(*p.Value.StringValue)
case reflect.Float32, reflect.Float64:
if p.Value.DoubleValue == nil {
return typeMismatchReason(p, v)
}
x := *p.Value.DoubleValue
if v.OverflowFloat(x) {
return fmt.Sprintf("value %v overflows struct field of type %v", x, v.Type())
}
v.SetFloat(x)
case reflect.Ptr:
if _, ok := v.Interface().(*Key); !ok {
return typeMismatchReason(p, v)
}
if p.Value.Referencevalue == nil {
return typeMismatchReason(p, v)
}
k, err := referenceValueToKey(p.Value.Referencevalue)
if err != nil {
return "stored key was invalid"
}
v.Set(reflect.ValueOf(k))
case reflect.Slice:
if _, ok := v.Interface().([]byte); !ok {
return typeMismatchReason(p, v)
}
if p.Value.StringValue == nil {
return typeMismatchReason(p, v)
}
b := []byte(*p.Value.StringValue)
v.Set(reflect.ValueOf(b))
default:
return typeMismatchReason(p, v)
}
if slice.IsValid() {
slice.Set(reflect.Append(slice, v))
}
return ""
}
func (c *conn) stat(t *T, tx txn) {
if g := c.getterFor(t); g != nil {
ln, rev := g.Stat(pb.GetString(t.Path))
c.respond(t, Valid|Done, nil, &R{Len: &ln, Rev: &rev})
}
}
