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godin.go
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godin.go
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package genki
import (
"fmt"
"strings"
"github.com/lukasjarosch/protoc-gen-genki/generator"
)
func init() {
generator.RegisterPlugin(new(genki))
}
type genki struct {
gen *generator.Generator
}
func (g *genki) Name() string {
return "genki"
}
// P forwards to g.gen.P.
func (g *genki) P(args ...interface{}) { g.gen.P(args...) }
// Init will initalize the genki plugin
func (g *genki) Init(gen *generator.Generator) {
g.gen = gen
}
func (g *genki) Generate(file *generator.FileDescriptor) {
for _, service := range file.Service {
clientInterfaceName := fmt.Sprintf("%sClient", service.GetName()) // this name is generated by the grpc plugin (e.g.: "ExampleServiceClient")
clientTypeName := fmt.Sprintf("%sGenkiClient", service.GetName())
cleanServiceName := strings.ToLower(service.GetName())
cleanServiceName = strings.Replace(cleanServiceName, "service", "", 1)
g.P("type ", clientTypeName, " struct {")
g.P("cc *genkiGrpcClient.Client")
g.P("service ", clientInterfaceName)
g.P("}")
// Factory function with address
g.P("func New", clientTypeName, "WithAddr(address string) (*", clientTypeName, ", error) {")
g.P("c := genkiGrpcClient.NewClientWithAddress(\"", cleanServiceName, "\", address)")
g.P("err := c.Connect()")
g.P("if err != nil {")
g.P("return nil, err")
g.P("}")
g.P("return &", clientTypeName, "{")
g.P(" cc: c,")
g.P(" service: New", clientInterfaceName, "(c.Connection()),")
g.P("}, nil")
g.P("}")
g.P()
// Factory function with address from flags
g.P("func New", clientTypeName, "() (*", clientTypeName, ", error) {")
g.P("c := genkiGrpcClient.NewClient(\"", cleanServiceName, "\")")
g.P("err := c.Connect()")
g.P("if err != nil {")
g.P("return nil, err")
g.P("}")
g.P("return &", clientTypeName, "{")
g.P(" cc: c,")
g.P(" service: New", clientInterfaceName, "(c.Connection()),")
g.P("}, nil")
g.P("}")
g.P()
for _, meth := range service.Method {
requestTypeName := g.typeName(meth.GetInputType())
responseTypeName := g.typeName(meth.GetOutputType())
methodName := meth.GetName()
g.P("// ", methodName, " will call ", file.GetPackage(), ".", service.GetName(), ".", methodName, "()")
g.P("func (client *", clientTypeName, ") ", methodName, "(ctx context.Context, request *", requestTypeName, ") (response *", responseTypeName, ", err error) {")
g.P("ctx = genkiMeta.NewOutgoingContext(ctx)")
g.P("req, err := client.service.", methodName, "(ctx, request)")
g.P("if err != nil {")
g.P("return nil, err")
g.P("}")
g.P("return req, nil")
g.P("}")
g.P()
}
// func Connect() (err error)
g.P("// Connect is a wrapper to the underlying genki client Connect() call")
g.P("func (client *", clientTypeName, ") Connect() (err error) {")
g.P("return client.cc.Connect()")
g.P("}")
g.P()
// func Connection() *grpc.ClientConn
g.P("// Connection is a wrapper to the underlying genki client Connection() call")
g.P("func (client *", clientTypeName, ") Connection() *grpc.ClientConn {")
g.P("return client.cc.Connection()")
g.P("}")
g.P()
// func Disconnect()
g.P("// Disconnect is a wrapper to the underlying genki client Disconnect() call")
g.P("func (client *", clientTypeName, ") Disconnect() {")
g.P("client.cc.Disconnect()")
g.P("}")
g.P()
// func Flags *pflag.Flagset()
g.P("// Flags is a wrapper to the underlying genki client Flags() call")
g.P("func GenkiClientFlags() *pflag.FlagSet {")
g.P("c := genkiGrpcClient.NewClient(\"", cleanServiceName, "\")")
g.P("return c.Flags()")
g.P("}")
g.P()
}
}
func (g *genki) GenerateImports(file *generator.FileDescriptor) {
if len(file.FileDescriptorProto.Service) == 0 {
return
}
g.P("import (")
g.P("genkiMeta \"github.com/lukasjarosch/genki/metadata\"")
g.P("genkiGrpcClient \"github.com/lukasjarosch/genki/client/grpc\"")
g.P("\"github.com/spf13/pflag\"")
g.P("\"context\"")
g.P("\"google.golang.org/grpc\"")
g.P(")")
g.P()
}
// Given a type name defined in a .proto, return its object.
// Also record that we're using it, to guarantee the associated import.
func (g *genki) objectNamed(name string) generator.Object {
g.gen.RecordTypeUse(name)
return g.gen.ObjectNamed(name)
}
// Return the printable name of a type (e.g. InputType)
func (g *genki) typeName(str string) string {
return g.gen.TypeName(g.objectNamed(str))
}