// GenerateCommonStubs is the core of the plugin package.
// It generates an interface based on the ServiceDescriptorProto that is used
// by the other two halves of the plugin.
func (p *Plugin) GenerateCommonStubs(svc *descriptor.ServiceDescriptorProto) {
name := generator.CamelCase(*svc.Name)
p.P("// ", name, " is an interface satisfied by the generated client and")
p.P("// which must be implemented by the object wrapped by the server.")
p.P("type ", name, " interface {")
p.In()
for _, m := range svc.Method {
method := generator.CamelCase(*m.Name)
iType := p.ObjectNamed(*m.InputType)
oType := p.ObjectNamed(*m.OutputType)
p.P(method, "(in *", p.TypeName(iType), ", out *", p.TypeName(oType), ") error")
}
p.Out()
p.P("}")
}
func generateService(g *generator.Generator, s *descriptor.ServiceDescriptorProto) {
// interface
g.P()
g.P("type ", s.Name, " interface {")
g.In()
for _, m := range s.Method {
g.P(generator.CamelCase(*m.Name),
"(req *", typeName(g, *m.InputType),
", resp *", typeName(g, *m.OutputType), ") error")
}
g.Out()
g.P("}")
// register
g.P()
g.P("func Register", s.Name, "(service ", s.Name, ") {")
g.In()
g.P("rpc.RegisterName(", strconv.Quote(*s.Name), ", service)")
g.Out()
g.P("}")
client_name := *s.Name + "Client"
// new client
g.P()
g.P("func New", client_name, "(conn io.ReadWriteCloser) *", client_name, " {")
g.In()
g.P("codec := muduorpc.NewClientCodec(conn)")
g.P("client := rpc.NewClientWithCodec(codec)")
g.P("return &", client_name, "{client}")
g.Out()
g.P("}")
// client
g.P()
g.P("type ", client_name, " struct {")
g.In()
g.P("client *rpc.Client")
g.Out()
g.P("}")
// client methods
g.P()
g.P("func (c *", client_name, ") Close () error {")
g.In()
g.P("return c.client.Close()")
g.Out()
g.P("}")
for _, m := range s.Method {
g.P()
g.P("func (c *", client_name, ") ", generator.CamelCase(*m.Name),
"(req *", typeName(g, *m.InputType),
", resp *", typeName(g, *m.OutputType), ") error {")
g.In()
name := *s.Name + "." + *m.Name
g.P("return c.client.Call(", strconv.Quote(name), ", req, resp)")
g.Out()
g.P("}")
}
}
func inspect_root_file(filename, treename string) []pb_field {
f := croot.OpenFile(filename, "read", "ROOT file", 1, 0)
if f == nil {
fmt.Printf("**error** could not open ROOT file [%s]\n", filename)
os.Exit(1)
}
defer f.Close("")
tree := f.GetTree(treename)
if tree == nil {
fmt.Printf("**error** could not retrieve Tree [%s] from file [%s]\n",
treename, filename)
}
//tree.Print("*")
branches := tree.GetListOfBranches()
fmt.Printf(" #-branches: %v\n", branches.GetSize())
imax := branches.GetSize()
type stringset map[string]struct{}
pb_fields := []pb_field{}
for i := int64(0); i < imax; i++ {
obj := branches.At(i)
br := obj.(croot.Branch)
typename := br.GetClassName()
if typename == "" {
leaf := tree.GetLeaf(br.GetName())
typename = leaf.GetTypeName()
}
if *verbose {
fmt.Printf(" [%d] -> [%v] (%v) (type:%v)\n", i, obj.GetName(), br.ClassName(), typename)
}
name := br.GetName()
pb_type, isrepeated := get_pb_type(typename)
accept := true
if *brsel != "" {
accept = false
for _, pattern := range strings.Split(*brsel, ",") {
switch pattern[0] {
case '-':
matched, err := filepath.Match(pattern[1:], name)
if err == nil && matched {
accept = false
break
}
case '+':
matched, err := filepath.Match(pattern[1:], name)
if err == nil && matched {
accept = true
break
}
default:
matched, err := filepath.Match(pattern, name)
if err == nil && matched {
accept = true
break
}
}
}
}
if accept {
pb_fields = append(pb_fields,
pb_field{
Name: pb_gen.CamelCase(name),
Type: pb_type,
Id: <-gen_id,
Branch: name,
repeated: isrepeated,
})
}
}
return pb_fields
}
// GenerateRPCStubs generates the net/rpc-based stubs.
// It generates an RPC client implementation of the interface as well as three
// helper functions to create the Client and Server necessary to utilize the
// service over RPC.
func (p *Plugin) GenerateRPCStubs(svc *descriptor.ServiceDescriptorProto) {
p.rpcImports = true
name := generator.CamelCase(*svc.Name)
p.P("// internal wrapper for type-safe RPC calling")
p.P("type rpc", name, "Client struct {")
p.In()
p.P("*rpc.Client")
p.Out()
p.P("}")
for _, m := range svc.Method {
method := generator.CamelCase(*m.Name)
iType := p.ObjectNamed(*m.InputType)
oType := p.ObjectNamed(*m.OutputType)
p.P("func (this rpc", name, "Client) ", method, "(in *", p.TypeName(iType), ", out *", p.TypeName(oType), ") error {")
p.In()
p.P(`return this.Call("`, name, ".", method, `", in, out)`)
p.Out()
p.P("}")
}
p.P()
p.P("// New", name, "Client returns an *rpc.Client wrapper for calling the methods of")
p.P("// ", name, " remotely.")
p.P("func New", name, "Client(conn net.Conn) ", name, " {")
p.In()
p.P("return rpc", name, "Client{rpc.NewClientWithCodec(codec.NewClientCodec(conn))}")
p.Out()
p.P("}")
p.P()
p.P("// Serve", name, " serves the given ", name, " backend implementation on conn.")
p.P("func Serve", name, "(conn net.Conn, backend ", name, ") error {")
p.In()
p.P("srv := rpc.NewServer()")
p.P(`if err := srv.RegisterName("`, name, `", backend); err != nil {`)
p.In()
p.P("return err")
p.Out()
p.P("}")
p.P("srv.ServeCodec(codec.NewServerCodec(conn))")
p.P("return nil")
p.Out()
p.P("}")
p.P()
p.P("// Dial", name, " returns a ", name, " for calling the ", name, " servince at addr (TCP).")
p.P("func Dial", name, "(addr string) (", name, ", error) {")
p.In()
p.P(`conn, err := net.Dial("tcp", addr)`)
p.P("if err != nil {")
p.In()
p.P("return nil, err")
p.Out()
p.P("}")
p.P("return New", name, "Client(conn), nil")
p.Out()
p.P("}")
p.P()
p.P("// ListenAndServe", name, " serves the given ", name, " backend implementation")
p.P("// on all connections accepted as a result of listening on addr (TCP).")
p.P("func ListenAndServe", name, "(addr string, backend ", name, ") error {")
p.In()
p.P(`clients, err := net.Listen("tcp", addr)`)
p.P("if err != nil {")
p.In()
p.P("return err")
p.Out()
p.P("}")
p.P("srv := rpc.NewServer()")
p.P(`if err := srv.RegisterName("`, name, `", backend); err != nil {`)
p.In()
p.P("return err")
p.Out()
p.P("}")
p.P("for {")
p.In()
p.P("conn, err := clients.Accept()")
p.P("if err != nil {")
p.In()
p.P("return err")
p.Out()
p.P("}")
p.P("go srv.ServeCodec(codec.NewServerCodec(conn))")
p.Out()
p.P("}")
p.P(`panic("unreachable")`)
p.Out()
p.P("}")
}
// GenerateWebStubs generates the webrpc stubs.
// It generates a webrpc client implementation of the interface as well as
// webrpc handlers and a helper function.
func (p *Plugin) GenerateWebStubs(svc *descriptor.ServiceDescriptorProto) {
p.webImports = true
name := generator.CamelCase(*svc.Name)
p.P(`// `, name, `Web is the web-based RPC version of the interface which`)
p.P(`// must be implemented by the object wrapped by the webrpc server.`)
p.P(`type `, name, `Web interface {`)
p.In()
for _, m := range svc.Method {
method := generator.CamelCase(*m.Name)
iType := p.ObjectNamed(*m.InputType)
oType := p.ObjectNamed(*m.OutputType)
p.P(method, "(r *http.Request, in *", p.TypeName(iType), ", out *", p.TypeName(oType), ") error")
}
p.Out()
p.P(`}`)
p.P()
p.P("// internal wrapper for type-safe webrpc calling")
p.P("type rpc", name, "WebClient struct {")
p.In()
p.P("remote *url.URL")
p.P("protocol webrpc.Protocol")
p.Out()
p.P("}")
p.P()
for _, m := range svc.Method {
method := generator.CamelCase(*m.Name)
iType := p.ObjectNamed(*m.InputType)
oType := p.ObjectNamed(*m.OutputType)
p.P("func (this rpc", name, "WebClient) ", method, "(in *", p.TypeName(iType), ", out *", p.TypeName(oType), ") error {")
p.In()
p.P(`return webrpc.Post(this.protocol, this.remote, "/`, name, "/", method, `", in, out)`)
p.Out()
p.P("}")
p.P()
}
p.P(`// Register a `, name, `Web implementation with the given webrpc ServeMux.`)
p.P(`// If mux is nil, the default webrpc.ServeMux is used.`)
p.P(`func Register`, name, `Web(this `, name, `Web, mux webrpc.ServeMux) error {`)
p.In()
p.P(`if mux == nil {`)
p.In()
p.P(`mux = webrpc.DefaultServeMux`)
p.Out()
p.P(`}`)
for _, m := range svc.Method {
method := generator.CamelCase(*m.Name)
iType := p.ObjectNamed(*m.InputType)
oType := p.ObjectNamed(*m.OutputType)
p.P(`if err := mux.Handle("/`, name, "/", method, `", func(c *webrpc.Call) error {`)
p.In()
p.P(`in, out := new(`, p.TypeName(iType), `), new(`, p.TypeName(oType), `)`)
p.P(`if err := c.ReadRequest(in); err != nil {`)
p.In()
p.P(`return err`)
p.Out()
p.P(`}`)
p.P(`if err := this.`, method, `(c.Request, in, out); err != nil {`)
p.In()
p.P(`return err`)
p.Out()
p.P(`}`)
p.P(`return c.WriteResponse(out)`)
p.Out()
p.P("}); err != nil {")
p.In()
p.P("return err")
p.Out()
p.P("}")
}
p.P("return nil")
p.Out()
p.P("}")
p.P()
p.P("// New", name, "WebClient returns a webrpc wrapper for calling the methods of ", name)
p.P("// remotely via the web. The remote URL is the base URL of the webrpc server.")
p.P("func New", name, "WebClient(pro webrpc.Protocol, remote *url.URL) ", name, " {")
p.In()
p.P("return rpc", name, "WebClient{remote, pro}")
p.Out()
p.P("}")
}
