43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
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// Package http provides adapters to render gomponents in http handlers.
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package http
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import (
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"net/http"
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g "github.com/maragudk/gomponents"
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)
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// Handler is like http.Handler but returns a Node and an error.
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// See Adapt for how errors are translated to HTTP responses.
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type Handler = func(http.ResponseWriter, *http.Request) (g.Node, error)
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type errorWithStatusCode interface {
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StatusCode() int
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}
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// Adapt a Handler to a http.Handlerfunc.
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// The returned Node is rendered to the ResponseWriter, in both normal and error cases.
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// If the Handler returns an error, and it implements a "StatusCode() int" method, that HTTP status code is sent
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// in the response header. Otherwise, the status code http.StatusInternalServerError (500) is used.
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func Adapt(h Handler) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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n, err := h(w, r)
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if err != nil {
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switch v := err.(type) {
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case errorWithStatusCode:
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w.WriteHeader(v.StatusCode())
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default:
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w.WriteHeader(http.StatusInternalServerError)
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}
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}
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if n == nil {
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return
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}
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if err := n.Render(w); err != nil {
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http.Error(w, "error rendering node: "+err.Error(), http.StatusInternalServerError)
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}
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}
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}
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