1.1.0

cmd/playground/main.go

@@ -62,13 +62,13 @@ func start(packagesFile, addr, goRoot string, debug bool) error {
 
 	r := mux.NewRouter()
 	langserver.New(packages).Mount(r.PathPrefix("/api").Subrouter())
-	r.PathPrefix("/").Handler(http.FileServer(http.Dir("./public")))
+	r.PathPrefix("/").Handler(langserver.SpaFileServer("./public"))
 
 	zap.S().Infof("Listening on %q", addr)
 
 	var handler http.Handler
 	if debug {
-		zap.S().Warn("Debug mode enabled, CORS disabled")
+		zap.S().Info("Debug mode enabled, CORS disabled")
 		handler = langserver.NewCORSDisablerWrapper(r)
 	} else {
 		handler = r

docker.mk

@@ -1,6 +1,5 @@
 DOCKERFILE ?= ./build/Dockerfile
 IMG_NAME ?= x1unix/go-playground
-TAG ?= 1.0.0
 
 .PHONY: docker
 docker: docker-login docker-make-image
@@ -20,5 +19,8 @@ docker-login:
 
 .PHONY: docker-make-image
 docker-make-image:
+	@if [ -z "$(TAG)" ]; then\
+		echo "required parameter TAG is undefined" && exit 1; \
+	fi;
 	@echo "- Building '$(IMG_NAME):latest' $(TAG)..."
 	docker image build -t $(IMG_NAME):latest -t $(IMG_NAME):$(TAG) -f $(DOCKERFILE) .

pkg/analyzer/decl.go

@@ -10,7 +10,7 @@ func formatFieldAndType(t ast.Expr, id *ast.Ident) string {
 	return id.String() + " " + typeStr
 }
 
-func formatFuncParams(params *ast.FieldList) (string, int) {
+func formatFieldsList(params *ast.FieldList, joinChar string) (string, int) {
 	if params == nil {
 		return "", 0
 	}
@@ -30,7 +30,7 @@ func formatFuncParams(params *ast.FieldList) (string, int) {
 		}
 	}
 
-	return strings.Join(fieldTypePair, ", "), paramsLen
+	return strings.Join(fieldTypePair, joinChar), paramsLen
 }
 
 func valSpecToItem(isConst bool, v *ast.ValueSpec, withPrivate bool) []*CompletionItem {
@@ -61,26 +61,30 @@ func valSpecToItem(isConst bool, v *ast.ValueSpec, withPrivate bool) []*Completi
 	return items
 }
 
-func funcToItem(fn *ast.FuncDecl) *CompletionItem {
-	ci := &CompletionItem{
-		Label:         fn.Name.String(),
-		Kind:          Function,
-		Documentation: fn.Doc.Text(),
-	}
-
-	params, _ := formatFuncParams(fn.Type.Params)
-	ci.Detail = "func(" + params + ")"
-	ci.InsertText = ci.Label + "(" + params + ")"
-
-	returns, retCount := formatFuncParams(fn.Type.Results)
+func funcToString(fn *ast.FuncType) string {
+	params, _ := formatFieldsList(fn.Params, ", ")
+	str := "func(" + params + ")"
+	returns, retCount := formatFieldsList(fn.Results, ", ")
 	switch retCount {
 	case 0:
 		break
 	case 1:
-		ci.Detail += " " + returns
+		str += " " + returns
 	default:
-		ci.Detail += " (" + returns + ")"
+		str += " (" + returns + ")"
+	}
+
+	return str
+}
+
+func funcToItem(fn *ast.FuncDecl) *CompletionItem {
+	ci := &CompletionItem{
+		Label:         fn.Name.String(),
+		Kind:          Function,
+		Documentation: fn.Doc.Text(),
 	}
 
+	ci.Detail = funcToString(fn.Type)
+	ci.InsertText = ci.Label + "()"
 	return ci
 }

pkg/analyzer/expr.go

@@ -23,6 +23,24 @@ func expToString(exp ast.Expr) string {
 		return v.Sel.String()
 	case *ast.StarExpr:
 		return "*" + expToString(v.X)
+	case *ast.Ellipsis:
+		return "..." + expToString(v.Elt)
+	case *ast.MapType:
+		keyT := expToString(v.Key)
+		valT := expToString(v.Value)
+		return "map[" + keyT + "]" + valT
+	case *ast.ChanType:
+		chanT := expToString(v.Value)
+		return "chan " + chanT
+	case *ast.InterfaceType:
+		typ := "interface{"
+		fields, fieldCount := formatFieldsList(v.Methods, "\n")
+		if fieldCount > 0 {
+			typ += "\n" + fields + "\n"
+		}
+		return typ + "}"
+	case *ast.FuncType:
+		return funcToString(v)
 	default:
 		log.Warnf("expToString: unknown expression - [%[1]T %[1]v]", exp)
 		return "interface{}"

pkg/goplay/client.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"go.uber.org/zap"
 	"io"
 	"net/http"
 	"net/url"
@@ -22,29 +21,47 @@ const (
 
 var ErrSnippetTooLarge = fmt.Errorf("code snippet too large (max %d bytes)", maxSnippetSize)
 
+func newRequest(ctx context.Context, method, queryPath string, body io.Reader) (*http.Request, error) {
+	uri := goPlayURL + "/" + queryPath
+	req, err := http.NewRequestWithContext(ctx, method, uri, body)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Add("User-Agent", userAgent)
+	return req, nil
+}
+
+func getRequest(ctx context.Context, queryPath string) (*http.Response, error) {
+	req, err := newRequest(ctx, http.MethodGet, queryPath, nil)
+	if err != nil {
+		return nil, nil
+	}
+
+	return http.DefaultClient.Do(req)
+}
+
 func doRequest(ctx context.Context, method, url, contentType string, body io.Reader) ([]byte, error) {
-	url = goPlayURL + "/" + url
-	zap.S().Debug("doRequest ", url)
-	req, err := http.NewRequestWithContext(ctx, method, url, body)
+	req, err := newRequest(ctx, method, url, body)
 	if err != nil {
 		return nil, err
 	}
 	req.Header.Add("Content-Type", contentType)
-	req.Header.Add("User-Agent", userAgent)
 	response, err := http.DefaultClient.Do(req)
 	if err != nil {
 		return nil, err
 	}
 
-	var bodyBytes bytes.Buffer
-	_, err = io.Copy(&bodyBytes, io.LimitReader(response.Body, maxSnippetSize+1))
+	bodyBytes := &bytes.Buffer{}
+	_, err = io.Copy(bodyBytes, io.LimitReader(response.Body, maxSnippetSize+1))
 	defer response.Body.Close()
 	if err != nil {
 		return nil, err
 	}
-	if bodyBytes.Len() > maxSnippetSize {
-		return nil, ErrSnippetTooLarge
+	if err = ValidateContentLength(bodyBytes); err != nil {
+		return nil, err
 	}
+
 	return bodyBytes.Bytes(), nil
 }
 

pkg/goplay/errors.go

@@ -0,0 +1,18 @@
+package goplay
+
+import "errors"
+
+var ErrSnippetNotFound = errors.New("snippet not found")
+
+type CompileFailedError struct {
+	msg string
+}
+
+func (c CompileFailedError) Error() string {
+	return c.msg
+}
+
+func IsCompileError(err error) bool {
+	_, ok := err.(CompileFailedError)
+	return ok
+}

pkg/goplay/methods.go

@@ -5,9 +5,60 @@ import (
 	"encoding/json"
 	"fmt"
 	"go.uber.org/zap"
+	"io"
+	"io/ioutil"
+	"net/http"
 	"net/url"
 )
 
+type lener interface {
+	Len() int
+}
+
+func ValidateContentLength(r lener) error {
+	if r.Len() > maxSnippetSize {
+		return ErrSnippetTooLarge
+	}
+
+	return nil
+}
+
+func GetSnippet(ctx context.Context, snippetID string) (*Snippet, error) {
+	fileName := snippetID + ".go"
+	resp, err := getRequest(ctx, "p/"+fileName)
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+	switch resp.StatusCode {
+	case http.StatusOK:
+		snippet, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return nil, err
+		}
+
+		return &Snippet{
+			FileName: fileName,
+			Contents: string(snippet),
+		}, nil
+	case http.StatusNotFound:
+		return nil, ErrSnippetNotFound
+	default:
+		return nil, fmt.Errorf("error from Go Playground server - %d %s", resp.StatusCode, resp.Status)
+	}
+}
+
+func Share(ctx context.Context, src io.Reader) (string, error) {
+	resp, err := doRequest(ctx, http.MethodPost, "share", "text/plain", src)
+	if err != nil {
+		return "", err
+	}
+
+	shareID := string(resp)
+	return shareID, nil
+}
+
 func GoImports(ctx context.Context, src []byte) (*FmtResponse, error) {
 	form := url.Values{}
 	form.Add("imports", "true")

pkg/goplay/types.go

@@ -5,6 +5,12 @@ import (
 	"time"
 )
 
+// Snippet represents shared snippet
+type Snippet struct {
+	FileName string
+	Contents string
+}
+
 // FmtResponse is the response returned from
 // upstream play.golang.org/fmt request
 type FmtResponse struct {
@@ -17,7 +23,7 @@ func (r *FmtResponse) HasError() error {
 		return nil
 	}
 
-	return errors.New(r.Error)
+	return CompileFailedError{msg: r.Error}
 }
 
 // CompileEvent represents individual

pkg/langserver/request.go

@@ -13,6 +13,15 @@ import (
 	"github.com/x1unix/go-playground/pkg/analyzer"
 )
 
+type SnippetResponse struct {
+	FileName string `json:"fileName"`
+	Code     string `json:"code"`
+}
+
+type ShareResponse struct {
+	SnippetID string `json:"snippetID"`
+}
+
 type SuggestionRequest struct {
 	PackageName string `json:"packageName"`
 	Value       string `json:"value"`

pkg/langserver/server.go

@@ -27,6 +27,8 @@ func (s *Service) Mount(r *mux.Router) {
 	r.Path("/suggest").HandlerFunc(s.GetSuggestion)
 	r.Path("/compile").Methods(http.MethodPost).HandlerFunc(s.Compile)
 	r.Path("/format").Methods(http.MethodPost).HandlerFunc(s.FormatCode)
+	r.Path("/share").Methods(http.MethodPost).HandlerFunc(s.Share)
+	r.Path("/snippet/{id}").Methods(http.MethodGet).HandlerFunc(s.GetSnippet)
 }
 
 func (s *Service) lookupBuiltin(val string) (*SuggestionsResponse, error) {
@@ -107,7 +109,7 @@ func (s *Service) goImportsCode(w http.ResponseWriter, r *http.Request) ([]byte,
 	}
 
 	if err = resp.HasError(); err != nil {
-		Errorf(http.StatusBadRequest, err.Error())
+		Errorf(http.StatusBadRequest, err.Error()).Write(w)
 		return nil, err, false
 	}
 
@@ -118,16 +120,64 @@ func (s *Service) goImportsCode(w http.ResponseWriter, r *http.Request) ([]byte,
 func (s *Service) FormatCode(w http.ResponseWriter, r *http.Request) {
 	code, err, _ := s.goImportsCode(w, r)
 	if err != nil {
+		if goplay.IsCompileError(err) {
+			return
+		}
+
 		s.log.Error(err)
 		return
 	}
 
 	WriteJSON(w, CompilerResponse{Formatted: string(code)})
 }
 
+func (s *Service) Share(w http.ResponseWriter, r *http.Request) {
+	shareID, err := goplay.Share(r.Context(), r.Body)
+	defer r.Body.Close()
+	if err != nil {
+		if err == goplay.ErrSnippetTooLarge {
+			Errorf(http.StatusRequestEntityTooLarge, err.Error()).Write(w)
+			return
+		}
+
+		s.log.Error("failed to share code: ", err)
+		NewErrorResponse(err).Write(w)
+	}
+
+	WriteJSON(w, ShareResponse{SnippetID: shareID})
+}
+
+func (s *Service) GetSnippet(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	snippetID := vars["id"]
+	snippet, err := goplay.GetSnippet(r.Context(), snippetID)
+	if err != nil {
+		if err == goplay.ErrSnippetNotFound {
+			Errorf(http.StatusNotFound, "snippet %q not found", snippetID).Write(w)
+			return
+		}
+
+		s.log.Errorw("failed to get snippet",
+			"snippetID", snippetID,
+			"err", err,
+		)
+		NewErrorResponse(err).Write(w)
+		return
+	}
+
+	WriteJSON(w, SnippetResponse{
+		FileName: snippet.FileName,
+		Code:     snippet.Contents,
+	})
+}
+
 func (s *Service) Compile(w http.ResponseWriter, r *http.Request) {
 	src, err, changed := s.goImportsCode(w, r)
 	if err != nil {
+		if goplay.IsCompileError(err) {
+			return
+		}
+
 		s.log.Error(err)
 		return
 	}
@@ -149,6 +199,6 @@ func (s *Service) Compile(w http.ResponseWriter, r *http.Request) {
 		result.Formatted = string(src)
 	}
 
-	s.log.Debugw("resp from compiler", "res", res)
+	s.log.Debugw("response from compiler", "res", res)
 	WriteJSON(w, result)
 }