diff options
Diffstat (limited to 'vendor/github.com/vektah/gqlgen/handler/graphql.go')
-rw-r--r-- | vendor/github.com/vektah/gqlgen/handler/graphql.go | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/vendor/github.com/vektah/gqlgen/handler/graphql.go b/vendor/github.com/vektah/gqlgen/handler/graphql.go deleted file mode 100644 index 4a5c61f5..00000000 --- a/vendor/github.com/vektah/gqlgen/handler/graphql.go +++ /dev/null @@ -1,235 +0,0 @@ -package handler - -import ( - "context" - "encoding/json" - "fmt" - "net/http" - "strings" - - "github.com/gorilla/websocket" - "github.com/vektah/gqlgen/graphql" - "github.com/vektah/gqlgen/neelance/errors" - "github.com/vektah/gqlgen/neelance/query" - "github.com/vektah/gqlgen/neelance/validation" -) - -type params struct { - Query string `json:"query"` - OperationName string `json:"operationName"` - Variables map[string]interface{} `json:"variables"` -} - -type Config struct { - upgrader websocket.Upgrader - recover graphql.RecoverFunc - errorPresenter graphql.ErrorPresenterFunc - resolverHook graphql.ResolverMiddleware - requestHook graphql.RequestMiddleware -} - -func (c *Config) newRequestContext(doc *query.Document, query string, variables map[string]interface{}) *graphql.RequestContext { - reqCtx := graphql.NewRequestContext(doc, query, variables) - if hook := c.recover; hook != nil { - reqCtx.Recover = hook - } - - if hook := c.errorPresenter; hook != nil { - reqCtx.ErrorPresenter = hook - } - - if hook := c.resolverHook; hook != nil { - reqCtx.ResolverMiddleware = hook - } - - if hook := c.requestHook; hook != nil { - reqCtx.RequestMiddleware = hook - } - - return reqCtx -} - -type Option func(cfg *Config) - -func WebsocketUpgrader(upgrader websocket.Upgrader) Option { - return func(cfg *Config) { - cfg.upgrader = upgrader - } -} - -func RecoverFunc(recover graphql.RecoverFunc) Option { - return func(cfg *Config) { - cfg.recover = recover - } -} - -// ErrorPresenter transforms errors found while resolving into errors that will be returned to the user. It provides -// a good place to add any extra fields, like error.type, that might be desired by your frontend. Check the default -// implementation in graphql.DefaultErrorPresenter for an example. -func ErrorPresenter(f graphql.ErrorPresenterFunc) Option { - return func(cfg *Config) { - cfg.errorPresenter = f - } -} - -// ResolverMiddleware allows you to define a function that will be called around every resolver, -// useful for tracing and logging. -// It will only be called for user defined resolvers, any direct binding to models is assumed -// to cost nothing. -func ResolverMiddleware(middleware graphql.ResolverMiddleware) Option { - return func(cfg *Config) { - if cfg.resolverHook == nil { - cfg.resolverHook = middleware - return - } - - lastResolve := cfg.resolverHook - cfg.resolverHook = func(ctx context.Context, next graphql.Resolver) (res interface{}, err error) { - return lastResolve(ctx, func(ctx context.Context) (res interface{}, err error) { - return middleware(ctx, next) - }) - } - } -} - -// RequestMiddleware allows you to define a function that will be called around the root request, -// after the query has been parsed. This is useful for logging and tracing -func RequestMiddleware(middleware graphql.RequestMiddleware) Option { - return func(cfg *Config) { - if cfg.requestHook == nil { - cfg.requestHook = middleware - return - } - - lastResolve := cfg.requestHook - cfg.requestHook = func(ctx context.Context, next func(ctx context.Context) []byte) []byte { - return lastResolve(ctx, func(ctx context.Context) []byte { - return middleware(ctx, next) - }) - } - } -} - -func GraphQL(exec graphql.ExecutableSchema, options ...Option) http.HandlerFunc { - cfg := Config{ - upgrader: websocket.Upgrader{ - ReadBufferSize: 1024, - WriteBufferSize: 1024, - }, - } - - for _, option := range options { - option(&cfg) - } - - return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { - if r.Method == http.MethodOptions { - w.Header().Set("Allow", "OPTIONS, GET, POST") - w.WriteHeader(http.StatusOK) - return - } - - if strings.Contains(r.Header.Get("Upgrade"), "websocket") { - connectWs(exec, w, r, &cfg) - return - } - - var reqParams params - switch r.Method { - case http.MethodGet: - reqParams.Query = r.URL.Query().Get("query") - reqParams.OperationName = r.URL.Query().Get("operationName") - - if variables := r.URL.Query().Get("variables"); variables != "" { - if err := json.Unmarshal([]byte(variables), &reqParams.Variables); err != nil { - sendErrorf(w, http.StatusBadRequest, "variables could not be decoded") - return - } - } - case http.MethodPost: - if err := json.NewDecoder(r.Body).Decode(&reqParams); err != nil { - sendErrorf(w, http.StatusBadRequest, "json body could not be decoded: "+err.Error()) - return - } - default: - w.WriteHeader(http.StatusMethodNotAllowed) - return - } - w.Header().Set("Content-Type", "application/json") - - doc, qErr := query.Parse(reqParams.Query) - if qErr != nil { - sendError(w, http.StatusUnprocessableEntity, qErr) - return - } - - errs := validation.Validate(exec.Schema(), doc) - if len(errs) != 0 { - sendError(w, http.StatusUnprocessableEntity, errs...) - return - } - - op, err := doc.GetOperation(reqParams.OperationName) - if err != nil { - sendErrorf(w, http.StatusUnprocessableEntity, err.Error()) - return - } - - reqCtx := cfg.newRequestContext(doc, reqParams.Query, reqParams.Variables) - ctx := graphql.WithRequestContext(r.Context(), reqCtx) - - defer func() { - if err := recover(); err != nil { - userErr := reqCtx.Recover(ctx, err) - sendErrorf(w, http.StatusUnprocessableEntity, userErr.Error()) - } - }() - - switch op.Type { - case query.Query: - b, err := json.Marshal(exec.Query(ctx, op)) - if err != nil { - panic(err) - } - w.Write(b) - case query.Mutation: - b, err := json.Marshal(exec.Mutation(ctx, op)) - if err != nil { - panic(err) - } - w.Write(b) - default: - sendErrorf(w, http.StatusBadRequest, "unsupported operation type") - } - }) -} - -func sendError(w http.ResponseWriter, code int, errors ...*errors.QueryError) { - w.WriteHeader(code) - var errs []*graphql.Error - for _, err := range errors { - var locations []graphql.ErrorLocation - for _, l := range err.Locations { - fmt.Println(graphql.ErrorLocation(l)) - locations = append(locations, graphql.ErrorLocation{ - Line: l.Line, - Column: l.Column, - }) - } - - errs = append(errs, &graphql.Error{ - Message: err.Message, - Path: err.Path, - Locations: locations, - }) - } - b, err := json.Marshal(&graphql.Response{Errors: errs}) - if err != nil { - panic(err) - } - w.Write(b) -} - -func sendErrorf(w http.ResponseWriter, code int, format string, args ...interface{}) { - sendError(w, code, &errors.QueryError{Message: fmt.Sprintf(format, args...)}) -} |