refactor kstate, add stub user syncing function

d2m/actions/create-room.js

@@ -9,50 +9,15 @@ const { discord, sync, db } = passthrough
 const file = sync.require("../../matrix/file")
 /** @type {import("../../matrix/api")} */
 const api = sync.require("../../matrix/api")
-
-function kstateStripConditionals(kstate) {
-	for (const [k, content] of Object.entries(kstate)) {
-		if ("$if" in content) {
-			if (content.$if) delete content.$if
-			else delete kstate[k]
-		}
-	}
-	return kstate
-}
-
-function kstateToState(kstate) {
-	const events = []
-	for (const [k, content] of Object.entries(kstate)) {
-		// conditional for whether a key is even part of the kstate (doing this declaratively on json is hard, so represent it as a property instead.)
-		if ("$if" in content && !content.$if) continue
-		delete content.$if
-
-		const [type, state_key] = k.split("/")
-		assert.ok(typeof type === "string")
-		assert.ok(typeof state_key === "string")
-		events.push({type, state_key, content})
-	}
-	return events
-}
-
-/**
- * @param {import("../../types").Event.BaseStateEvent[]} events
- * @returns {any}
- */
-function stateToKState(events) {
-	const kstate = {}
-	for (const event of events) {
-		kstate[event.type + "/" + event.state_key] = event.content
-	}
-	return kstate
-}
+/** @type {import("../../matrix/kstate")} */
+const ks = sync.require("../../matrix/kstate")
 
 /**
  * @param {string} roomID
  */
 async function roomToKState(roomID) {
 	const root = await api.getAllState(roomID)
-	return stateToKState(root)
+	return ks.stateToKState(root)
 }
 
 /**
@@ -60,33 +25,12 @@ async function roomToKState(roomID) {
  * @params {any} kstate
  */
 function applyKStateDiffToRoom(roomID, kstate) {
-	const events = kstateToState(kstate)
+	const events = ks.kstateToState(kstate)
 	return Promise.all(events.map(({type, state_key, content}) =>
 		api.sendState(roomID, type, state_key, content)
 	))
 }
 
-function diffKState(actual, target) {
-	const diff = {}
-	// go through each key that it should have
-	for (const key of Object.keys(target)) {
-		if (key in actual) {
-			// diff
-			try {
-				assert.deepEqual(actual[key], target[key])
-			} catch (e) {
-				// they differ. reassign the target
-				diff[key] = target[key]
-			}
-		} else {
-			// not present, needs to be added
-			diff[key] = target[key]
-		}
-		// keys that are missing in "actual" will not be deleted on "target" (no action)
-	}
-	return diff
-}
-
 /**
  * @param {import("discord-api-types/v10").APIGuildTextChannel} channel
  * @param {import("discord-api-types/v10").APIGuild} guild
@@ -98,7 +42,7 @@ async function channelToKState(channel, guild) {
 	const avatarEventContent = {}
 	if (guild.icon) {
 		avatarEventContent.discord_path = file.guildIcon(guild)
-		avatarEventContent.url = await file.uploadDiscordFileToMxc(avatarEventContent.discord_path)
+		avatarEventContent.url = await file.uploadDiscordFileToMxc(avatarEventContent.discord_path) // TODO: somehow represent future values in kstate (callbacks?), while still allowing for diffing, so test cases don't need to touch the media API
 	}
 
 	const channelKState = {
@@ -138,7 +82,7 @@ async function createRoom(channel, guild, spaceID, kstate) {
 		preset: "private_chat",
 		visibility: "private",
 		invite: ["@cadence:cadence.moe"], // TODO
-		initial_state: kstateToState(kstate)
+		initial_state: ks.kstateToState(kstate)
 	})
 
 	db.prepare("INSERT INTO channel_room (channel_id, room_id) VALUES (?, ?)").run(channel.id, roomID)
@@ -204,12 +148,12 @@ async function _syncRoom(channelID, shouldActuallySync) {
 
 		// sync channel state to room
 		const roomKState = await roomToKState(existing)
-		const roomDiff = diffKState(roomKState, channelKState)
+		const roomDiff = ks.diffKState(roomKState, channelKState)
 		const roomApply = applyKStateDiffToRoom(existing, roomDiff)
 
 		// sync room as space member
 		const spaceKState = await roomToKState(spaceID)
-		const spaceDiff = diffKState(spaceKState, {
+		const spaceDiff = ks.diffKState(spaceKState, {
 			[`m.space.child/${existing}`]: {
 				via: ["cadence.moe"] // TODO: use the proper server
 			}
@@ -241,8 +185,4 @@ module.exports.createRoom = createRoom
 module.exports.ensureRoom = ensureRoom
 module.exports.syncRoom = syncRoom
 module.exports.createAllForGuild = createAllForGuild
-module.exports.kstateToState = kstateToState
-module.exports.stateToKState = stateToKState
-module.exports.diffKState = diffKState
 module.exports.channelToKState = channelToKState
-module.exports.kstateStripConditionals = kstateStripConditionals

d2m/actions/create-room.test.js

@@ -1,80 +1,8 @@
-const {kstateToState, stateToKState, diffKState, channelToKState, kstateStripConditionals} = require("./create-room")
+const {channelToKState} = require("./create-room")
+const {kstateStripConditionals} = require("../../matrix/kstate")
 const {test} = require("supertape")
 const testData = require("../../test/data")
 
-test("kstate2state: general", t => {
-	t.deepEqual(kstateToState({
-		"m.room.name/": {name: "test name"},
-		"m.room.member/@cadence:cadence.moe": {membership: "join"}
-	}), [
-		{
-			type: "m.room.name",
-			state_key: "",
-			content: {
-				name: "test name"
-			}
-		},
-		{
-			type: "m.room.member",
-			state_key: "@cadence:cadence.moe",
-			content: {
-				membership: "join"
-			}
-		}
-	])
-})
-
-test("state2kstate: general", t => {
-	t.deepEqual(stateToKState([
-		{
-			type: "m.room.name",
-			state_key: "",
-			content: {
-				name: "test name"
-			}
-		},
-		{
-			type: "m.room.member",
-			state_key: "@cadence:cadence.moe",
-			content: {
-				membership: "join"
-			}
-		}
-	]), {
-		"m.room.name/": {name: "test name"},
-		"m.room.member/@cadence:cadence.moe": {membership: "join"}
-	})
-})
-
-test("diffKState: detects edits", t => {
-	t.deepEqual(
-		diffKState({
-			"m.room.name/": {name: "test name"},
-			"same/": {a: 2}
-		}, {
-			"m.room.name/": {name: "edited name"},
-			"same/": {a: 2}
-		}),
-		{
-			"m.room.name/": {name: "edited name"}
-		}
-	)
-})
-
-test("diffKState: detects new properties", t => {
-	t.deepEqual(
-		diffKState({
-			"m.room.name/": {name: "test name"},
-		}, {
-			"m.room.name/": {name: "test name"},
-			"new/": {a: 2}
-		}),
-		{
-			"new/": {a: 2}
-		}
-	)
-})
-
 test("channel2room: general", async t => {
 	t.deepEqual(
 		kstateStripConditionals(await channelToKState(testData.channel.general, testData.guild.general).then(x => x.channelKState)),

d2m/actions/register-user.js

@@ -78,5 +78,15 @@ async function ensureSimJoined(user, roomID) {
 	return mxid
 }
 
+/**
+ * @param {import("discord-api-types/v10").APIUser} user
+ * @param {Required<Omit<import("discord-api-types/v10").APIGuildMember, "user">>} member
+ */
+async function memberToStateContent(user, member) {
+	return {
+		displayname: member.nick || user.username
+	}
+}
+
 module.exports.ensureSim = ensureSim
 module.exports.ensureSimJoined = ensureSimJoined

matrix/kstate.js

@@ -0,0 +1,65 @@
+// @ts-check
+
+const assert = require("assert")
+
+/** Mutates the input. */
+function kstateStripConditionals(kstate) {
+	for (const [k, content] of Object.entries(kstate)) {
+		// conditional for whether a key is even part of the kstate (doing this declaratively on json is hard, so represent it as a property instead.)
+		if ("$if" in content) {
+			if (content.$if) delete content.$if
+			else delete kstate[k]
+		}
+	}
+	return kstate
+}
+
+function kstateToState(kstate) {
+	const events = []
+	kstateStripConditionals(kstate)
+	for (const [k, content] of Object.entries(kstate)) {
+		const [type, state_key] = k.split("/")
+		assert.ok(typeof type === "string")
+		assert.ok(typeof state_key === "string")
+		events.push({type, state_key, content})
+	}
+	return events
+}
+
+/**
+ * @param {import("../types").Event.BaseStateEvent[]} events
+ * @returns {any}
+ */
+function stateToKState(events) {
+	const kstate = {}
+	for (const event of events) {
+		kstate[event.type + "/" + event.state_key] = event.content
+	}
+	return kstate
+}
+
+function diffKState(actual, target) {
+	const diff = {}
+	// go through each key that it should have
+	for (const key of Object.keys(target)) {
+		if (key in actual) {
+			// diff
+			try {
+				assert.deepEqual(actual[key], target[key])
+			} catch (e) {
+				// they differ. reassign the target
+				diff[key] = target[key]
+			}
+		} else {
+			// not present, needs to be added
+			diff[key] = target[key]
+		}
+		// keys that are missing in "actual" will not be deleted on "target" (no action)
+	}
+	return diff
+}
+
+module.exports.kstateStripConditionals = kstateStripConditionals
+module.exports.kstateToState = kstateToState
+module.exports.stateToKState = stateToKState
+module.exports.diffKState = diffKState

matrix/kstate.test.js

@@ -0,0 +1,94 @@
+const {kstateToState, stateToKState, diffKState, kstateStripConditionals} = require("./kstate")
+const {test} = require("supertape")
+
+test("kstate strip: strips false conditions", t => {
+   t.deepEqual(kstateStripConditionals({
+      a: {$if: false, value: 2},
+      b: {value: 4}
+   }), {
+      b: {value: 4}
+   })
+})
+
+test("kstate strip: keeps true conditions while removing $if", t => {
+   t.deepEqual(kstateStripConditionals({
+      a: {$if: true, value: 2},
+      b: {value: 4}
+   }), {
+      a: {value: 2},
+      b: {value: 4}
+   })
+})
+
+test("kstate2state: general", t => {
+	t.deepEqual(kstateToState({
+		"m.room.name/": {name: "test name"},
+		"m.room.member/@cadence:cadence.moe": {membership: "join"}
+	}), [
+		{
+			type: "m.room.name",
+			state_key: "",
+			content: {
+				name: "test name"
+			}
+		},
+		{
+			type: "m.room.member",
+			state_key: "@cadence:cadence.moe",
+			content: {
+				membership: "join"
+			}
+		}
+	])
+})
+
+test("state2kstate: general", t => {
+	t.deepEqual(stateToKState([
+		{
+			type: "m.room.name",
+			state_key: "",
+			content: {
+				name: "test name"
+			}
+		},
+		{
+			type: "m.room.member",
+			state_key: "@cadence:cadence.moe",
+			content: {
+				membership: "join"
+			}
+		}
+	]), {
+		"m.room.name/": {name: "test name"},
+		"m.room.member/@cadence:cadence.moe": {membership: "join"}
+	})
+})
+
+test("diffKState: detects edits", t => {
+	t.deepEqual(
+		diffKState({
+			"m.room.name/": {name: "test name"},
+			"same/": {a: 2}
+		}, {
+			"m.room.name/": {name: "edited name"},
+			"same/": {a: 2}
+		}),
+		{
+			"m.room.name/": {name: "edited name"}
+		}
+	)
+})
+
+test("diffKState: detects new properties", t => {
+	t.deepEqual(
+		diffKState({
+			"m.room.name/": {name: "test name"},
+		}, {
+			"m.room.name/": {name: "test name"},
+			"new/": {a: 2}
+		}),
+		{
+			"new/": {a: 2}
+		}
+	)
+})

test/test.js

@@ -12,7 +12,8 @@ const sync = new HeatSync({watchFS: false})
 
 Object.assign(passthrough, { config, sync, db })
 
+require("../matrix/kstate.test")
+require("../matrix/api.test")
 require("../matrix/read-registration.test")
 require("../d2m/actions/create-room.test")
 require("../d2m/converters/user-to-mxid.test")
-require("../matrix/api.test")