2020-07-28 19:17:07 +00:00
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package main
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import (
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2020-07-29 15:17:48 +00:00
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"context"
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2020-07-28 19:17:07 +00:00
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"database/sql"
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"errors"
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"net/http"
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2020-07-31 19:44:16 +00:00
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"strings"
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2020-07-28 19:17:07 +00:00
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)
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2020-07-30 19:18:13 +00:00
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var errPostNotFound = errors.New("post not found")
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2020-07-28 19:17:07 +00:00
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2020-07-31 13:48:01 +00:00
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type Post struct {
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Path string `json:"path"`
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Content string `json:"content"`
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Published string `json:"published"`
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Updated string `json:"updated"`
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Parameters map[string]string `json:"parameters"`
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2020-07-28 19:17:07 +00:00
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}
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2020-07-29 14:41:36 +00:00
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func servePost(w http.ResponseWriter, r *http.Request) {
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path := slashTrimmedPath(r)
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post, err := getPost(r.Context(), path)
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if err == errPostNotFound {
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serve404(w, r)
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2020-07-29 14:41:36 +00:00
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return
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} else if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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render(w, templatePost, post)
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}
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2020-07-31 13:48:01 +00:00
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func getPost(context context.Context, path string) (*Post, error) {
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queriedPost := &Post{}
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row := appDb.QueryRowContext(context, "select path, COALESCE(content, ''), COALESCE(published, ''), COALESCE(updated, '') from posts where path=?", path)
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err := row.Scan(&queriedPost.Path, &queriedPost.Content, &queriedPost.Published, &queriedPost.Updated)
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if err == sql.ErrNoRows {
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return nil, errPostNotFound
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2020-07-28 19:17:07 +00:00
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} else if err != nil {
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return nil, err
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}
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2020-07-29 16:28:51 +00:00
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err = queriedPost.fetchParameters(context)
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if err != nil {
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return nil, err
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}
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2020-07-28 19:17:07 +00:00
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return queriedPost, nil
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}
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2020-07-29 15:17:48 +00:00
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2020-07-31 13:48:01 +00:00
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func (p *Post) fetchParameters(context context.Context) error {
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rows, err := appDb.QueryContext(context, "select parameter, COALESCE(value, '') from post_parameters where path=?", p.Path)
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2020-07-29 16:28:51 +00:00
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if err != nil {
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return err
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}
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p.Parameters = make(map[string]string)
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for rows.Next() {
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var parameter string
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var value string
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_ = rows.Scan(¶meter, &value)
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p.Parameters[parameter] = value
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}
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return nil
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}
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2020-07-29 15:17:48 +00:00
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func allPostPaths() ([]string, error) {
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var postPaths []string
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rows, err := appDb.Query("select path from posts")
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if err != nil {
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return nil, err
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}
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for rows.Next() {
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var path string
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_ = rows.Scan(&path)
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postPaths = append(postPaths, path)
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}
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return postPaths, nil
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}
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2020-07-31 19:44:16 +00:00
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2020-08-01 13:16:21 +00:00
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func checkPost(post *Post) error {
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if post == nil {
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return errors.New("no post")
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}
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if post.Path == "" || !strings.HasPrefix(post.Path, "/") {
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return errors.New("wrong path")
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}
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2020-08-01 13:16:21 +00:00
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return nil
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}
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func createPost(post *Post) error {
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err := checkPost(post)
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if err != nil {
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return err
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}
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startWritingToDb()
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tx, err := appDb.Begin()
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if err != nil {
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return err
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}
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_, err = tx.Exec("insert into posts (path, content, published, updated) values (?, ?, ?, ?)", post.Path, post.Content, post.Published, post.Updated)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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for param, value := range post.Parameters {
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_, err = tx.Exec("insert into post_parameters (path, parameter, value) values (?, ?, ?)", post.Path, param, value)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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}
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err = tx.Commit()
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if err != nil {
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return err
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}
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finishWritingToDb()
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2020-08-01 13:16:21 +00:00
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go purgeCache(post.Path)
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return reloadRouter()
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}
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func deletePost(post *Post) error {
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err := checkPost(post)
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if err != nil {
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return err
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}
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startWritingToDb()
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tx, err := appDb.Begin()
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if err != nil {
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return err
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}
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_, err = tx.Exec("delete from posts where path=?", post.Path)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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_, err = tx.Exec("delete from post_parameters where path=?", post.Path)
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if err != nil {
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_ = tx.Rollback()
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return err
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}
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err = tx.Commit()
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if err != nil {
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return err
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}
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finishWritingToDb()
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go purgeCache(post.Path)
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2020-07-31 19:44:16 +00:00
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return reloadRouter()
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}
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