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package plugin
import (
"strings"
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"github.com/gogo/protobuf/protoc-gen-gogo/generator"
)
type ttrpcGenerator struct {
*generator.Generator
generator.PluginImports
typeurlPkg generator.Single
ttrpcPkg generator.Single
contextPkg generator.Single
}
func init() {
generator.RegisterPlugin(new(ttrpcGenerator))
}
func (p *ttrpcGenerator) Name() string {
return "ttrpc"
}
func (p *ttrpcGenerator) Init(g *generator.Generator) {
p.Generator = g
}
func (p *ttrpcGenerator) Generate(file *generator.FileDescriptor) {
p.PluginImports = generator.NewPluginImports(p.Generator)
p.contextPkg = p.NewImport("context")
p.typeurlPkg = p.NewImport("github.com/containerd/typeurl")
p.ttrpcPkg = p.NewImport("github.com/stevvooe/ttrpc")
for _, service := range file.GetService() {
serviceName := service.GetName()
if pkg := file.GetPackage(); pkg != "" {
serviceName = pkg + "." + serviceName
}
p.genService(serviceName, service)
}
}
func (p *ttrpcGenerator) genService(fullName string, service *descriptor.ServiceDescriptorProto) {
serviceName := service.GetName() + "Service"
p.P()
p.P("type ", serviceName, " interface{")
p.In()
for _, method := range service.Method {
p.P(method.GetName(),
"(ctx ", p.contextPkg.Use(), ".Context, ",
"req *", p.typeName(method.GetInputType()), ") ",
"(*", p.typeName(method.GetOutputType()), ", error)")
}
p.Out()
p.P("}")
p.P()
// registration method
p.P("func Register", serviceName, "(srv *", p.ttrpcPkg.Use(), ".Server, svc ", serviceName, ") {")
p.In()
p.P(`srv.Register("`, fullName, `", map[string]`, p.ttrpcPkg.Use(), ".Method{")
p.In()
for _, method := range service.Method {
p.P(`"`, method.GetName(), `": `, `func(ctx context.Context, unmarshal func(interface{}) error) (interface{}, error) {`)
p.In()
p.P("var req ", p.typeName(method.GetInputType()))
p.P(`if err := unmarshal(&req); err != nil {`)
p.In()
p.P(`return nil, err`)
p.Out()
p.P(`}`)
p.P("return svc.", method.GetName(), "(ctx, &req)")
p.Out()
p.P("},")
}
p.Out()
p.P("})")
p.Out()
p.P("}")
clientType := service.GetName() + "Client"
clientStructType := strings.ToLower(clientType[:1]) + clientType[1:]
p.P()
p.P("type ", clientStructType, " struct{")
p.In()
p.P("client *", p.ttrpcPkg.Use(), ".Client")
p.Out()
p.P("}")
p.P()
p.P("func New", clientType, "(client *", p.ttrpcPkg.Use(), ".Client)", serviceName, "{")
p.In()
p.P("return &", clientStructType, "{")
p.In()
p.P("client: client,")
p.Out()
p.P("}")
p.Out()
p.P("}")
p.P()
for _, method := range service.Method {
p.P()
p.P("func (c *", clientStructType, ") ", method.GetName(),
"(ctx ", p.contextPkg.Use(), ".Context, ",
"req *", p.typeName(method.GetInputType()), ") ",
"(*", p.typeName(method.GetOutputType()), ", error) {")
p.In()
p.P("var resp ", p.typeName(method.GetOutputType()))
p.P("if err := c.client.Call(ctx, ", `"`+fullName+`", `, `"`+method.GetName()+`"`, ", req, &resp); err != nil {")
p.In()
p.P("return nil, err")
p.Out()
p.P("}")
p.P("return &resp, nil")
p.Out()
p.P("}")
}
}
func (p *ttrpcGenerator) objectNamed(name string) generator.Object {
p.Generator.RecordTypeUse(name)
return p.Generator.ObjectNamed(name)
}
func (p *ttrpcGenerator) typeName(str string) string {
return p.Generator.TypeName(p.objectNamed(str))
}
|
