package handlers import ( "github.com/aclindsa/gorp" "github.com/aclindsa/moneygo/internal/models" "log" "net/http" "path" "strconv" "strings" ) // But who writes the ResponseWriterWriter? type ResponseWriterWriter interface { Write(http.ResponseWriter) error } type Context struct { Tx *Tx User *models.User remainingURL string // portion of URL path not yet reached in the hierarchy } func (c *Context) SetURL(url string) { c.remainingURL = path.Clean("/" + url)[1:] } func (c *Context) NextLevel() string { split := strings.SplitN(c.remainingURL, "/", 2) if len(split) == 2 { c.remainingURL = split[1] } else { c.remainingURL = "" } return split[0] } func (c *Context) NextID() (int64, error) { return strconv.ParseInt(c.NextLevel(), 0, 64) } func (c *Context) LastLevel() bool { return len(c.remainingURL) == 0 } type Handler func(*http.Request, *Context) ResponseWriterWriter type APIHandler struct { DB *gorp.DbMap } func (ah *APIHandler) txWrapper(h Handler, r *http.Request, context *Context) (writer ResponseWriterWriter) { tx, err := GetTx(ah.DB) if err != nil { log.Print(err) return NewError(999 /*Internal Error*/) } defer func() { if r := recover(); r != nil { tx.Rollback() panic(r) } if _, ok := writer.(*Error); ok { tx.Rollback() } else { err = tx.Commit() if err != nil { log.Print(err) writer = NewError(999 /*Internal Error*/) } } }() context.Tx = tx return h(r, context) } func (ah *APIHandler) route(r *http.Request) ResponseWriterWriter { context := &Context{} context.SetURL(r.URL.Path) if context.NextLevel() != "v1" { return NewError(3 /*Invalid Request*/) } route := context.NextLevel() switch route { case "sessions": return ah.txWrapper(SessionHandler, r, context) case "users": return ah.txWrapper(UserHandler, r, context) case "securities": return ah.txWrapper(SecurityHandler, r, context) case "securitytemplates": return SecurityTemplateHandler(r, context) case "accounts": return ah.txWrapper(AccountHandler, r, context) case "transactions": return ah.txWrapper(TransactionHandler, r, context) case "imports": return ah.txWrapper(ImportHandler, r, context) case "reports": return ah.txWrapper(ReportHandler, r, context) default: return NewError(3 /*Invalid Request*/) } } func (ah *APIHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { ah.route(r).Write(w) }