Mercurial > gemma
view pkg/controllers/json.go @ 486:b2dc9c2f69e0 metamorph-for-all
First stab to use the metamorphic db to do all database stuff.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 24 Aug 2018 13:56:06 +0200 |
parents | c1047fd04a3a |
children | 8a0737aa6ab6 |
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package controllers import ( "database/sql" "encoding/json" "fmt" "log" "net/http" "github.com/jackc/pgx" "gemma.intevation.de/gemma/pkg/auth" ) type JSONResult struct { Code int Result interface{} } type JSONHandler struct { Input func() interface{} Handle func(interface{}, *http.Request, *sql.Conn) (JSONResult, error) NoConn bool } type JSONError struct { Code int Message string } func (je JSONError) Error() string { return fmt.Sprintf("%d: %s", je.Code, je.Message) } func (j *JSONHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) { var input interface{} if j.Input != nil { input = j.Input() defer req.Body.Close() if err := json.NewDecoder(req.Body).Decode(input); err != nil { http.Error(rw, "error: "+err.Error(), http.StatusBadRequest) return } } var jr JSONResult var err error if token, ok := auth.GetToken(req); ok && !j.NoConn { var session *auth.Session if session, err = auth.ConnPool.Do(token); err != nil { var conn *sql.Conn if conn, err = auth.MetamorphConn(req.Context(), session.User); err != nil { defer conn.Close() jr, err = j.Handle(input, req, conn) } } } else { jr, err = j.Handle(input, req, nil) } if err != nil { switch e := err.(type) { case pgx.PgError: var res = struct { Result string `json:"result"` Code string `json:"code"` Message string `json:"message"` }{ Result: "failure", Code: e.Code, Message: e.Message, } rw.Header().Set("Content-Type", "application/json") rw.WriteHeader(http.StatusInternalServerError) if err := json.NewEncoder(rw).Encode(&res); err != nil { log.Printf("error: %v\n", err) } case JSONError: rw.Header().Set("Content-Type", "application/json") if e.Code == 0 { e.Code = http.StatusInternalServerError } rw.WriteHeader(e.Code) var res = struct { Message string `json:"message"` }{ Message: e.Message, } if err := json.NewEncoder(rw).Encode(&res); err != nil { log.Printf("error: %v\n", err) } default: log.Printf("err: %v\n", err) http.Error(rw, "error: "+err.Error(), http.StatusInternalServerError) } return } if jr.Code == 0 { jr.Code = http.StatusOK } if jr.Code != http.StatusNoContent { rw.Header().Set("Content-Type", "application/json") } rw.WriteHeader(jr.Code) if jr.Code != http.StatusNoContent { if err := json.NewEncoder(rw).Encode(jr.Result); err != nil { log.Printf("error: %v\n", err) } } }