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grpc.go
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grpc.go
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package server
import (
"context"
"encoding/json"
"time"
"github.com/bblfsh/sdk/v3/driver"
"github.com/bblfsh/sdk/v3/driver/manifest"
protocol2 "github.com/bblfsh/sdk/v3/protocol"
uast1 "github.com/bblfsh/sdk/v3/protocol/v1"
"github.com/bblfsh/sdk/v3/uast/nodes"
"google.golang.org/grpc"
protocol1 "gopkg.in/bblfsh/sdk.v1/protocol"
)
// NewGRPCServer creates a gRPC server instance that dispatches requests to a provided driver.
//
// It will automatically include default server options for bblfsh protocol.
func NewGRPCServer(drv driver.DriverModule, opts ...grpc.ServerOption) *grpc.Server {
opts = append(opts, protocol2.ServerOptions()...)
return NewGRPCServerCustom(drv, opts...)
}
// NewGRPCServerCustom is the same as NewGRPCServer, but it won't include any options except the ones that were passed.
func NewGRPCServerCustom(drv driver.DriverModule, opts ...grpc.ServerOption) *grpc.Server {
srv := grpc.NewServer(opts...)
protocol1.DefaultService = service{drv}
protocol1.RegisterProtocolServiceServer(
srv,
protocol1.NewProtocolServiceServer(),
)
protocol2.RegisterDriver(srv, drv)
return srv
}
type service struct {
d driver.DriverModule
}
func errResp(err error) protocol1.Response {
return protocol1.Response{Status: protocol1.Fatal, Errors: []string{err.Error()}}
}
func newDriverManifest(manifest *manifest.Manifest) protocol1.DriverManifest {
features := make([]string, len(manifest.Features))
for i, feature := range manifest.Features {
features[i] = string(feature)
}
return protocol1.DriverManifest{
Name: manifest.Name,
Language: manifest.Language,
Version: manifest.Version,
Status: string(manifest.Status),
Features: features,
}
}
func containsLang(lang string, list []manifest.Manifest) bool {
for _, m := range list {
if m.Language == lang {
return true
}
for _, l := range m.Aliases {
if l == lang {
return true
}
}
}
return false
}
// SupportedLanguages implements protocol1.Service.
func (s service) SupportedLanguages(_ *protocol1.SupportedLanguagesRequest) *protocol1.SupportedLanguagesResponse {
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
list, err := s.d.Languages(ctx)
if err != nil {
return &protocol1.SupportedLanguagesResponse{Response: errResp(err)}
}
resp := &protocol1.SupportedLanguagesResponse{
Response: protocol1.Response{Status: protocol1.Ok},
}
for _, m := range list {
resp.Languages = append(resp.Languages, newDriverManifest(&m))
}
return resp
}
func (s service) parse(mode driver.Mode, req *protocol1.ParseRequest) (nodes.Node, protocol1.Response) {
start := time.Now()
ctx := context.Background()
if req.Timeout > 0 {
var cancel func()
ctx, cancel = context.WithTimeout(ctx, req.Timeout)
defer cancel()
}
list, err := s.d.Languages(ctx)
if err != nil {
r := errResp(err)
r.Elapsed = time.Since(start)
return nil, r
}
if !containsLang(req.Language, list) {
r := errResp(ErrUnsupportedLanguage.New(req.Language))
r.Elapsed = time.Since(start)
return nil, r
}
ast, err := s.d.Parse(ctx, req.Content, &driver.ParseOptions{
Mode: mode,
Language: req.Language,
Filename: req.Filename,
})
dt := time.Since(start)
var r protocol1.Response
if err != nil {
r = errResp(err)
} else {
r = protocol1.Response{Status: protocol1.Ok}
}
r.Elapsed = dt
return ast, r
}
// Parse implements protocol1.Service.
func (s service) Parse(req *protocol1.ParseRequest) *protocol1.ParseResponse {
ast, resp := s.parse(driver.ModeAnnotated, req)
if resp.Status != protocol1.Ok {
return &protocol1.ParseResponse{Response: resp}
}
nd, err := uast1.ToNode(ast)
if err != nil {
r := errResp(err)
r.Elapsed = resp.Elapsed
return &protocol1.ParseResponse{Response: r}
}
return &protocol1.ParseResponse{
Response: resp,
Language: req.Language,
Filename: req.Filename,
UAST: nd,
}
}
// NativeParse implements protocol1.Service.
func (s service) NativeParse(req *protocol1.NativeParseRequest) *protocol1.NativeParseResponse {
ast, resp := s.parse(driver.ModeNative, (*protocol1.ParseRequest)(req))
if resp.Status != protocol1.Ok {
return &protocol1.NativeParseResponse{Response: resp}
}
data, err := json.Marshal(ast)
if err != nil {
r := errResp(err)
r.Elapsed = resp.Elapsed
return &protocol1.NativeParseResponse{Response: r}
}
return &protocol1.NativeParseResponse{
Response: resp,
Language: req.Language,
AST: string(data),
}
}
// Version implements protocol1.Service.
func (s service) Version(req *protocol1.VersionRequest) *protocol1.VersionResponse {
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
m, err := s.d.Version(ctx)
if err != nil {
return &protocol1.VersionResponse{Response: errResp(err)}
}
return &protocol1.VersionResponse{
Version: m.Version,
Build: m.Build,
}
}