Initial implementation of post rendering over gmi

This commit is contained in:
Brian Picciano 2023-01-21 16:01:52 +01:00
parent 84c1322c44
commit 7878db5c95
6 changed files with 215 additions and 6 deletions

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@ -124,6 +124,8 @@ func main() {
}()
gmiParams.Logger = logger.WithNamespace("gmi")
gmiParams.PostStore = postStore
gmiParams.PostAssetStore = postAssetStore
logger.Info(ctx, "starting gmi api")
gmiAPI, err := gmi.New(gmiParams)

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@ -12,6 +12,7 @@ import (
"git.sr.ht/~adnano/go-gemini"
"git.sr.ht/~adnano/go-gemini/certificate"
"github.com/mediocregopher/blog.mediocregopher.com/srv/cfg"
"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
)
@ -19,7 +20,11 @@ import (
// Params are used to instantiate a new API instance. All fields are required
// unless otherwise noted.
type Params struct {
Logger *mlog.Logger
Logger *mlog.Logger
PostStore post.Store
PostAssetStore post.AssetStore
PublicURL *url.URL
ListenAddr string
CertificatesPath string
@ -86,9 +91,14 @@ func New(params Params) (API, error) {
params: params,
}
handler, err := a.handler()
if err != nil {
return nil, fmt.Errorf("constructing handler: %w", err)
}
a.srv = &gemini.Server{
Addr: params.ListenAddr,
Handler: a.handler(),
Handler: handler,
GetCertificate: certStore.Get,
}
@ -109,14 +119,47 @@ func (a *api) Shutdown(ctx context.Context) error {
return a.srv.Shutdown(ctx)
}
func (a *api) handler() gemini.Handler {
func postsMiddleware(tplHandler gemini.Handler) gemini.Handler {
return gemini.HandlerFunc(func(
ctx context.Context,
rw gemini.ResponseWriter,
r *gemini.Request,
) {
fmt.Fprintf(rw, "# Test\n\n")
fmt.Fprintf(rw, "HELLO WORLD\n\n")
fmt.Fprintf(rw, "=> gemini://midnight.pub Hit the pub\n\n")
id := strings.TrimPrefix(r.URL.Path, "/posts/")
id = strings.TrimSuffix(id, ".gmi")
if id == "index" {
tplHandler.ServeGemini(ctx, rw, r)
return
}
query := r.URL.Query()
query.Set("id", id)
r.URL.RawQuery = query.Encode()
r.URL.Path = "/posts/post.gmi"
tplHandler.ServeGemini(ctx, rw, r)
})
}
func (a *api) handler() (gemini.Handler, error) {
tplHandler, err := a.tplHandler()
if err != nil {
return nil, fmt.Errorf("generating tpl handler: %w", err)
}
mux := new(gemini.Mux)
mux.Handle("/posts/", postsMiddleware(tplHandler))
mux.Handle("/", tplHandler)
h := mux
// TODO logging
// TODO caching
return h, nil
}

134
src/gmi/tpl.go Normal file
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@ -0,0 +1,134 @@
package gmi
import (
"bytes"
"context"
"embed"
"fmt"
"io"
"io/fs"
"net/url"
"strconv"
"strings"
"text/template"
"git.sr.ht/~adnano/go-gemini"
"github.com/mediocregopher/blog.mediocregopher.com/srv/post"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
)
//go:embed tpl
var tplFS embed.FS
type rendererGetPostsRes struct {
Posts []post.StoredPost
HasMore bool
}
type renderer struct {
url *url.URL
postStore post.Store
}
func (r renderer) GetPosts(page, count int) (rendererGetPostsRes, error) {
posts, hasMore, err := r.postStore.Get(page, count)
return rendererGetPostsRes{posts, hasMore}, err
}
func (r renderer) GetPostByID(id string) (post.StoredPost, error) {
p, err := r.postStore.GetByID(id)
if err != nil {
return post.StoredPost{}, fmt.Errorf("fetching post %q: %w", id, err)
}
return p, nil
}
func (r renderer) GetQueryValue(key, def string) string {
v := r.url.Query().Get(key)
if v == "" {
v = def
}
return v
}
func (r renderer) GetQueryIntValue(key string, def int) (int, error) {
vStr := r.GetQueryValue(key, strconv.Itoa(def))
return strconv.Atoi(vStr)
}
func (r renderer) Add(a, b int) int { return a + b }
func (a *api) tplHandler() (gemini.Handler, error) {
allTpls := template.New("")
err := fs.WalkDir(tplFS, "tpl", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
body, err := fs.ReadFile(tplFS, path)
if err != nil {
panic(err)
}
name := strings.TrimPrefix(path, "tpl/")
allTpls, err = allTpls.New(name).Parse(string(body))
if err != nil {
return fmt.Errorf("parsing %q as template: %w", path, err)
}
return nil
})
if err != nil {
return nil, fmt.Errorf("parsing templates: %w", err)
}
return gemini.HandlerFunc(func(
ctx context.Context,
rw gemini.ResponseWriter,
r *gemini.Request,
) {
if strings.HasSuffix(r.URL.Path, "/") {
r.URL.Path += "index.gmi"
}
tplPath := strings.TrimPrefix(r.URL.Path, "/")
ctx = mctx.Annotate(ctx,
"url", r.URL,
"tplPath", tplPath,
)
tpl := allTpls.Lookup(tplPath)
if tpl == nil {
a.params.Logger.WarnString(ctx, "page not found")
rw.WriteHeader(gemini.StatusNotFound, "Page not found, sorry!")
return
}
buf := new(bytes.Buffer)
err := tpl.Execute(buf, renderer{
url: r.URL,
postStore: a.params.PostStore,
})
if err != nil {
a.params.Logger.Error(ctx, "rendering error", err)
rw.WriteHeader(gemini.StatusTemporaryFailure, err.Error())
return
}
io.Copy(rw, buf)
}), nil
}

3
src/gmi/tpl/index.gmi Normal file
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@ -0,0 +1,3 @@
# Index
=> /posts/index.gmi See all posts

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@ -0,0 +1,18 @@
# mediocregopher's Posts
{{ $page := .GetQueryIntValue "page" 0 -}}
{{ $getPostsRes := .GetPosts $page 20 -}}
{{ if gt $page 0 -}}
=> /posts.gmi?page={{ .Add $page -1 }} Previous Page
{{ end -}}
{{ range $getPostsRes.Posts -}}
=> /posts/{{ .ID }}.gmi {{ .PublishedAt.Format "2006-01-02" }} - {{ .Title }}
{{ end -}}
{{ if $getPostsRes.HasMore -}}
=> /posts.gmi?page={{ .Add $page 1 }} Next page
{{ end -}}

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@ -0,0 +1,9 @@
{{ $post := .GetPostByID (.GetQueryValue "id" "") -}}
# {{ $post.Title }}
{{ if ne $post.Description "" -}}
> {{ $post.Description }}
{{ end -}}
{{ $post.Body }}