Follow infrastructure

src/db/db.go

@@ -62,8 +62,8 @@ func NewConnWithConfig(cfg config.PostgresConfig) *pgx.Conn {
 	pgcfg, err := pgx.ParseConfig(cfg.DSN())
 
 	pgcfg.Tracer = &tracelog.TraceLog{
-		zerologadapter.NewLogger(log.Logger),
+		Logger:   zerologadapter.NewLogger(log.Logger),
-		cfg.LogLevel,
+		LogLevel: cfg.LogLevel,
 	}
 
 	conn, err := pgx.ConnectConfig(context.Background(), pgcfg)
@@ -88,8 +88,8 @@ func NewConnPoolWithConfig(cfg config.PostgresConfig) *pgxpool.Pool {
 	pgcfg.MinConns = cfg.MinConn
 	pgcfg.MaxConns = cfg.MaxConn
 	pgcfg.ConnConfig.Tracer = &tracelog.TraceLog{
-		zerologadapter.NewLogger(log.Logger),
+		Logger:   zerologadapter.NewLogger(log.Logger),
-		cfg.LogLevel,
+		LogLevel: cfg.LogLevel,
 	}
 
 	conn, err := pgxpool.NewWithConfig(context.Background(), pgcfg)

src/hmnurl/urls.go

@@ -937,6 +937,28 @@ func BuildTwitchEventSubCallback() string {
 
 var RegexTwitchDebugPage = regexp.MustCompile("^/twitch_debug$")
 
+/*
+* Following
+ */
+
+var RegexFollowingTest = regexp.MustCompile("^/following$")
+
+func BuildFollowingTest() string {
+	return Url("/following", nil)
+}
+
+var RegexFollowUser = regexp.MustCompile("^/follow/user$")
+
+func BuildFollowUser() string {
+	return Url("/follow/user", nil)
+}
+
+var RegexFollowProject = regexp.MustCompile("^/follow/project$")
+
+func BuildFollowProject() string {
+	return Url("/follow/project", nil)
+}
+
 /*
 * User assets
  */

src/migration/migrations/2024-05-16T194134Z_AddFollower.go

@@ -0,0 +1,56 @@
+package migrations
+
+import (
+	"context"
+	"time"
+
+	"git.handmade.network/hmn/hmn/src/migration/types"
+	"github.com/jackc/pgx/v5"
+)
+
+func init() {
+	registerMigration(AddFollower{})
+}
+
+type AddFollower struct{}
+
+func (m AddFollower) Version() types.MigrationVersion {
+	return types.MigrationVersion(time.Date(2024, 5, 16, 19, 41, 34, 0, time.UTC))
+}
+
+func (m AddFollower) Name() string {
+	return "AddFollower"
+}
+
+func (m AddFollower) Description() string {
+	return "Add follower table"
+}
+
+func (m AddFollower) Up(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx,
+		`
+		CREATE TABLE follower (
+			user_id int NOT NULL,
+			following_user_id int REFERENCES hmn_user (id) ON DELETE CASCADE,
+			following_project_id int REFERENCES project (id) ON DELETE CASCADE
+		);
+
+		CREATE INDEX follower_user_id ON follower(user_id);
+		CREATE UNIQUE INDEX follower_following_user ON follower (user_id, following_user_id);
+		CREATE UNIQUE INDEX follower_following_project ON follower (user_id, following_project_id);
+		`,
+	)
+	return err
+}
+
+func (m AddFollower) Down(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx,
+		`
+		DROP INDEX follower_following_user;
+		DROP INDEX follower_following_project;
+		DROP INDEX follower_user_id;
+		DROP TABLE follower;
+		`,
+	)
+	return err
+}

src/templates/src/following_test.html

@@ -0,0 +1,9 @@
+{{ template "base.html" . }}
+
+{{ define "content" }}
+<div class="flex flex-column">
+	{{ range .TimelineItems }}
+		{{ template "timeline_item.html" . }}
+	{{ end }}
+</div>
+{{ end }}

src/templates/src/project_homepage.html

@@ -43,6 +43,34 @@
 				</a>
 			</div>
 		{{ end }}
+		{{ if .FollowUrl }}
+			<a id="follow_link" class="db" href="javascript:;">{{ if .Following }}Unfollow{{ else }}Follow{{ end }}</a>
+			<script>
+				const followLink = document.getElementById("follow_link");
+				let following = {{ .Following }};
+				followLink.addEventListener("click", async function() {
+					followLink.disabled = true;
+
+					let formData = new FormData();
+					formData.set("csrf_token", "{{ .Session.CSRFToken }}");
+					formData.set("project_id", "{{ .Project.ID }}");
+					if (following) {
+						formData.set("unfollow", "true");
+					}
+					let result = await fetch("{{ .FollowUrl }}", {
+						method: "POST",
+						body: formData,
+						redirect: "error",
+					});
+					if (result.ok) {
+						following = !following;
+						followLink.textContent = (following ? "Unfollow" : "Follow");
+					}
+					
+					followLink.disabled = false;
+				});
+			</script>
+		{{ end }}
 		{{ if or .Header.Project.CanEdit (gt (len .RecentActivity) 0) }}
 			<hr class="w-100 mv4">
 			<div class="w-100 flex g3">

src/templates/src/user_profile.html

@@ -43,6 +43,34 @@
 			{{ with or .ProfileUser.Bio .ProfileUser.Blurb }}
 				<div class="mb3">{{ . }}</div>
 			{{ end }}
+			{{ if .FollowUrl }}
+				<a id="follow_link" class="db" href="javascript:;">{{ if .Following }}Unfollow{{ else }}Follow{{ end }}</a>
+				<script>
+					const followLink = document.getElementById("follow_link");
+					let following = {{ .Following }};
+					followLink.addEventListener("click", async function() {
+						followLink.disabled = true;
+
+						let formData = new FormData();
+						formData.set("csrf_token", "{{ .Session.CSRFToken }}");
+						formData.set("user_id", "{{ .ProfileUser.ID }}");
+						if (following) {
+							formData.set("unfollow", "true");
+						}
+						let result = await fetch("{{ .FollowUrl }}", {
+							method: "POST",
+							body: formData,
+							redirect: "error",
+						});
+						if (result.ok) {
+							following = !following;
+							followLink.textContent = (following ? "Unfollow" : "Follow");
+						}
+						
+						followLink.disabled = false;
+					});
+				</script>
+			{{ end }}
 			<div class="w-100 w-auto-ns w-100-l">
 				{{ if .ProfileUser.Email }}
 					<div class="pair flex">

src/website/following.go

@@ -0,0 +1,254 @@
+package website
+
+import (
+	"net/http"
+	"sort"
+	"strconv"
+
+	"git.handmade.network/hmn/hmn/src/db"
+	"git.handmade.network/hmn/hmn/src/hmndata"
+	"git.handmade.network/hmn/hmn/src/logging"
+	"git.handmade.network/hmn/hmn/src/models"
+	"git.handmade.network/hmn/hmn/src/oops"
+	"git.handmade.network/hmn/hmn/src/templates"
+)
+
+func FollowingTest(c *RequestContext) ResponseData {
+	type Follower struct {
+		UserID             int  `db:"user_id"`
+		FollowingUserID    *int `db:"following_user_id"`
+		FollowingProjectID *int `db:"following_project_id"`
+	}
+
+	following, err := db.Query[Follower](c, c.Conn, `
+		SELECT $columns
+		FROM follower
+		WHERE user_id = $1
+	`, c.CurrentUser.ID)
+
+	if err != nil {
+		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch follow data"))
+	}
+
+	projectIDs := make([]int, 0, len(following))
+	userIDs := make([]int, 0, len(following))
+	for _, f := range following {
+		if f.FollowingProjectID != nil {
+			projectIDs = append(projectIDs, *f.FollowingProjectID)
+		}
+		if f.FollowingUserID != nil {
+			userIDs = append(userIDs, *f.FollowingUserID)
+		}
+	}
+
+	var userSnippets []hmndata.SnippetAndStuff
+	var projectSnippets []hmndata.SnippetAndStuff
+	var userPosts []hmndata.PostAndStuff
+	var projectPosts []hmndata.PostAndStuff
+
+	if len(following) > 0 {
+		projects, err := hmndata.FetchProjects(c, c.Conn, c.CurrentUser, hmndata.ProjectsQuery{
+			ProjectIDs: projectIDs,
+		})
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch projects"))
+		}
+
+		// NOTE(asaf): The original projectIDs might container hidden/abandoned projects,
+		//             so we recreate it after the projects get filtered by FetchProjects.
+		projectIDs = projectIDs[0:0]
+		for _, p := range projects {
+			projectIDs = append(projectIDs, p.Project.ID)
+		}
+
+		userSnippets, err = hmndata.FetchSnippets(c, c.Conn, c.CurrentUser, hmndata.SnippetQuery{
+			OwnerIDs: userIDs,
+		})
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch user snippets"))
+		}
+		projectSnippets, err = hmndata.FetchSnippets(c, c.Conn, c.CurrentUser, hmndata.SnippetQuery{
+			ProjectIDs: projectIDs,
+		})
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch project snippets"))
+		}
+
+		userPosts, err = hmndata.FetchPosts(c, c.Conn, c.CurrentUser, hmndata.PostsQuery{
+			UserIDs:        userIDs,
+			SortDescending: true,
+		})
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch user posts"))
+		}
+		projectPosts, err = hmndata.FetchPosts(c, c.Conn, c.CurrentUser, hmndata.PostsQuery{
+			ProjectIDs:     projectIDs,
+			SortDescending: true,
+		})
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch project posts"))
+		}
+
+	}
+
+	c.Perf.StartBlock("FOLLOWING", "Construct timeline items")
+	timelineItems := make([]templates.TimelineItem, 0, len(userSnippets)+len(projectSnippets)+len(userPosts)+len(projectPosts))
+
+	if len(userPosts) > 0 || len(projectPosts) > 0 {
+		c.Perf.StartBlock("SQL", "Fetch subforum tree")
+		subforumTree := models.GetFullSubforumTree(c, c.Conn)
+		lineageBuilder := models.MakeSubforumLineageBuilder(subforumTree)
+		c.Perf.EndBlock()
+
+		for _, post := range userPosts {
+			timelineItems = append(timelineItems, PostToTimelineItem(
+				hmndata.UrlContextForProject(&post.Project),
+				lineageBuilder,
+				&post.Post,
+				&post.Thread,
+				post.Author,
+				c.Theme,
+			))
+		}
+		for _, post := range projectPosts {
+			timelineItems = append(timelineItems, PostToTimelineItem(
+				hmndata.UrlContextForProject(&post.Project),
+				lineageBuilder,
+				&post.Post,
+				&post.Thread,
+				post.Author,
+				c.Theme,
+			))
+		}
+	}
+
+	for _, s := range userSnippets {
+		item := SnippetToTimelineItem(
+			&s.Snippet,
+			s.Asset,
+			s.DiscordMessage,
+			s.Projects,
+			s.Owner,
+			c.Theme,
+			false,
+		)
+		item.SmallInfo = true
+		timelineItems = append(timelineItems, item)
+	}
+	for _, s := range projectSnippets {
+		item := SnippetToTimelineItem(
+			&s.Snippet,
+			s.Asset,
+			s.DiscordMessage,
+			s.Projects,
+			s.Owner,
+			c.Theme,
+			false,
+		)
+		item.SmallInfo = true
+		timelineItems = append(timelineItems, item)
+	}
+
+	// TODO(asaf): Show when they're live on twitch
+
+	c.Perf.StartBlock("FOLLOWING", "Sort timeline")
+	sort.Slice(timelineItems, func(i, j int) bool {
+		return timelineItems[j].Date.Before(timelineItems[i].Date)
+	})
+	c.Perf.EndBlock()
+
+	c.Perf.EndBlock()
+
+	type FollowingTestData struct {
+		templates.BaseData
+		TimelineItems []templates.TimelineItem
+	}
+
+	var res ResponseData
+	res.MustWriteTemplate("following_test.html", FollowingTestData{
+		BaseData:      getBaseDataAutocrumb(c, "Following test"),
+		TimelineItems: timelineItems,
+	}, c.Perf)
+	return res
+}
+
+func FollowUser(c *RequestContext) ResponseData {
+	err := c.Req.ParseForm()
+	if err != nil {
+		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to parse form data"))
+	}
+
+	userIDStr := c.Req.Form.Get("user_id")
+	unfollowStr := c.Req.Form.Get("unfollow")
+
+	userID, err := strconv.Atoi(userIDStr)
+	if err != nil {
+		return c.ErrorResponse(http.StatusBadRequest, oops.New(err, "failed to parse user_id field"))
+	}
+	unfollow := unfollowStr != ""
+
+	if unfollow {
+		_, err = c.Conn.Exec(c, `
+			DELETE FROM follower
+			WHERE user_id = $1 AND following_user_id = $2
+		`, c.CurrentUser.ID, userID)
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to unfollow user"))
+		}
+	} else {
+		_, err = c.Conn.Exec(c, `
+			INSERT INTO follower (user_id, following_user_id)
+			VALUES ($1, $2)
+			ON CONFLICT DO NOTHING
+		`, c.CurrentUser.ID, userID)
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to follow user"))
+		}
+	}
+
+	var res ResponseData
+	addCORSHeaders(c, &res)
+	res.WriteHeader(http.StatusNoContent)
+	return res
+}
+
+func FollowProject(c *RequestContext) ResponseData {
+	err := c.Req.ParseForm()
+	if err != nil {
+		return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to parse form data"))
+	}
+
+	projectIDStr := c.Req.Form.Get("project_id")
+	unfollowStr := c.Req.Form.Get("unfollow")
+
+	projectID, err := strconv.Atoi(projectIDStr)
+	if err != nil {
+		return c.ErrorResponse(http.StatusBadRequest, oops.New(err, "failed to parse project_id field"))
+	}
+	unfollow := unfollowStr != ""
+
+	if unfollow {
+		_, err = c.Conn.Exec(c, `
+			DELETE FROM follower
+			WHERE user_id = $1 AND following_project_id = $2
+		`, c.CurrentUser.ID, projectID)
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to unfollow project"))
+		}
+	} else {
+		logging.Debug().Int("userID", c.CurrentUser.ID).Int("projectID", projectID).Msg("thing")
+		_, err = c.Conn.Exec(c, `
+			INSERT INTO follower (user_id, following_project_id)
+			VALUES ($1, $2)
+			ON CONFLICT DO NOTHING
+		`, c.CurrentUser.ID, projectID)
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to follow project"))
+		}
+	}
+
+	var res ResponseData
+	addCORSHeaders(c, &res)
+	res.WriteHeader(http.StatusNoContent)
+	return res
+}

src/website/projects.go

@@ -319,6 +319,20 @@ func jamLink(jamSlug string) string {
 	}
 }
 
+type ProjectHomepageData struct {
+	templates.BaseData
+	Project        templates.Project
+	Owners         []templates.User
+	Screenshots    []string
+	ProjectLinks   []templates.Link
+	Licenses       []templates.Link
+	RecentActivity []templates.TimelineItem
+	SnippetEdit    templates.SnippetEdit
+
+	FollowUrl string
+	Following bool
+}
+
 func ProjectHomepage(c *RequestContext) ResponseData {
 	maxRecentActivity := 15
 
@@ -389,6 +403,9 @@ func ProjectHomepage(c *RequestContext) ResponseData {
 		NamedLinks, UnnamedLinks []templates.Link
 		RecentActivity           []templates.TimelineItem
 		SnippetEdit              templates.SnippetEdit
+
+		FollowUrl string
+		Following bool
 	}
 
 	var templateData ProjectHomepageData
@@ -500,6 +517,8 @@ func ProjectHomepage(c *RequestContext) ResponseData {
 	})
 	c.Perf.EndBlock()
 
+	followUrl := ""
+	following := false
 	if c.CurrentUser != nil {
 		userProjects, err := hmndata.FetchProjects(c, c.Conn, c.CurrentUser, hmndata.ProjectsQuery{
 			OwnerIDs: []int{c.CurrentUser.ID},
@@ -521,7 +540,19 @@ func ProjectHomepage(c *RequestContext) ResponseData {
 			SubmitUrl:             hmnurl.BuildSnippetSubmit(),
 			AssetMaxSize:          AssetMaxSize(c.CurrentUser),
 		}
+
+		followUrl = hmnurl.BuildFollowProject()
+		following, err = db.QueryOneScalar[bool](c, c.Conn, `
+			SELECT COUNT(*) > 0
+			FROM follower
+			WHERE user_id = $1 AND following_project_id = $2
+		`, c.CurrentUser.ID, c.CurrentProject.ID)
+		if err != nil {
+			return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch following status"))
 		}
+	}
+	templateData.FollowUrl = followUrl
+	templateData.Following = following
 
 	var res ResponseData
 	err = res.WriteTemplate("project_homepage.html", templateData, c.Perf)

src/website/routes.go

@@ -165,6 +165,10 @@ func NewWebsiteRoutes(conn *pgxpool.Pool) http.Handler {
 	hmnOnly.GET(hmnurl.RegexSnippet, Snippet)
 	hmnOnly.GET(hmnurl.RegexProjectIndex, ProjectIndex)
 
+	hmnOnly.GET(hmnurl.RegexFollowingTest, needsAuth(FollowingTest))
+	hmnOnly.POST(hmnurl.RegexFollowUser, needsAuth(csrfMiddleware(FollowUser)))
+	hmnOnly.POST(hmnurl.RegexFollowProject, needsAuth(csrfMiddleware(FollowProject)))
+
 	hmnOnly.GET(hmnurl.RegexProjectNew, needsAuth(ProjectNew))
 	hmnOnly.POST(hmnurl.RegexProjectNew, needsAuth(csrfMiddleware(ProjectNewSubmit)))
 

src/website/user.go

@@ -36,6 +36,9 @@ type UserProfileTemplateData struct {
 	CanAddProject bool
 	NewProjectUrl string
 
+	FollowUrl string
+	Following bool
+
 	AdminSetOptionsUrl string
 	AdminNukeUrl       string
 
@@ -113,12 +116,10 @@ func UserProfile(c *RequestContext) ResponseData {
 	}
 	c.Perf.EndBlock()
 
-	c.Perf.StartBlock("SQL", "Fetch posts")
 	posts, err := hmndata.FetchPosts(c, c.Conn, c.CurrentUser, hmndata.PostsQuery{
 		UserIDs:        []int{profileUser.ID},
 		SortDescending: true,
 	})
-	c.Perf.EndBlock()
 
 	snippets, err := hmndata.FetchSnippets(c, c.Conn, c.CurrentUser, hmndata.SnippetQuery{
 		OwnerIDs: []int{profileUser.ID},
@@ -172,6 +173,9 @@ func UserProfile(c *RequestContext) ResponseData {
 
 	baseData := getBaseDataAutocrumb(c, templateUser.Name)
 
+	ownProfile := (c.CurrentUser != nil && c.CurrentUser.ID == profileUser.ID)
+	followUrl := ""
+	following := false
 	snippetEdit := templates.SnippetEdit{}
 	if c.CurrentUser != nil {
 		snippetEdit = templates.SnippetEdit{
@@ -179,6 +183,19 @@ func UserProfile(c *RequestContext) ResponseData {
 			SubmitUrl:             hmnurl.BuildSnippetSubmit(),
 			AssetMaxSize:          AssetMaxSize(c.CurrentUser),
 		}
+
+		if !ownProfile {
+			followUrl = hmnurl.BuildFollowUser()
+			following, err = db.QueryOneScalar[bool](c, c.Conn, `
+				SELECT COUNT(*) > 0
+				FROM follower
+				WHERE user_id = $1 AND following_user_id = $2
+			`, c.CurrentUser.ID, profileUser.ID)
+			if err != nil {
+				return c.ErrorResponse(http.StatusInternalServerError, oops.New(err, "failed to fetch following status"))
+			}
+		}
+
 	}
 
 	var res ResponseData
@@ -188,11 +205,14 @@ func UserProfile(c *RequestContext) ResponseData {
 		ProfileUserLinks:    profileUserLinks,
 		ProfileUserProjects: templateProjects,
 		TimelineItems:       timelineItems,
-		OwnProfile:          (c.CurrentUser != nil && c.CurrentUser.ID == profileUser.ID),
+		OwnProfile:          ownProfile,
 
 		CanAddProject: numPersonalProjects < maxPersonalProjects,
 		NewProjectUrl: hmnurl.BuildProjectNew(),
 
+		FollowUrl: followUrl,
+		Following: following,
+
 		AdminSetOptionsUrl: hmnurl.BuildAdminSetUserOptions(),
 		AdminNukeUrl:       hmnurl.BuildAdminNukeUser(),