@microsoft/teams.apps
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470 lines • 36.5 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.HttpStream = void 0;
const axios_1 = require("axios");
const teams_api_1 = require("@microsoft/teams.api");
const teams_common_1 = require("@microsoft/teams.common");
const types_1 = require("../types");
const utils_1 = require("../utils");
/**
* HTTP-based streaming implementation for Microsoft Teams activities.
*
* Allows sending typing indicators and messages in chunks to Teams.
* Queues incoming activities and flushes them periodically to avoid
* rate limits.
*
* Flow:
* 1. `emit()` adds activities to the queue and starts a flush if none scheduled.
* 2. `flush()` starts by cancelling any pending flush, then drains the entire queue under a lock.
* 3. Informative typing updates are sent immediately, but only while no message text has accumulated.
* 4. Message text is combined and sent as a typing activity.
* 5. `flush()` schedules another flush 500ms later if more items remain in queue.
* 6. `close()` waits for the queue to empty and sends the final message activity.
*/
class HttpStream {
events = new teams_common_1.EventEmitter();
client;
ref;
replyChain;
index = 0;
id;
text = '';
channelData = {};
finalActivity;
queue = [];
_result;
_timeout;
_logger;
_flushing = false;
_timedOut = false;
_retired = false;
_totalTimeout = 30000; // 30 seconds
/**
* @deprecated Teams no longer supports stopping a stream; always returns false.
*/
get canceled() {
return false;
}
/**
* Whether the stream has timed out.
* Set when the service reports ten minutes have elapsed since the first
* informative or content chunk.
*/
get timedOut() {
return this._timedOut;
}
/**
* Whether the current streamed message has been finalized.
*
* Closing is idempotent until the next emit or update reopens the stream.
*/
get closed() {
return this._result !== undefined;
}
constructor(client, ref, logger, options) {
this.client = client;
this.ref = ref;
this.replyChain = options?.replyChain;
this._logger = logger?.child('stream') || new teams_common_1.ConsoleLogger('@teams/http-stream');
}
emit(activity) {
// Emitting after close or a retired Plan cycle starts a fresh stream cycle.
if (this.closed || this._retired) {
this._logger.debug('starting a new streamed message');
this.resetForNextStream();
}
if (typeof activity === 'string') {
activity = {
type: 'message',
text: activity,
};
}
else if (activity.type === 'message') {
activity = teams_api_1.MessageActivityInput.from(activity);
}
else {
activity = teams_api_1.TypingActivityInput.from(activity);
}
this.queue.push(activity);
// Start flush if not already scheduled
if (!this._timeout) {
this.flush();
}
}
/**
* Send a typing/status update without adding to the main text.
* @param text Status text (ex. "Thinking...")
* @param textFormat Format of `text` (ex. `'extendedmarkdown'`). Omit or pass `null`
* to use the Teams default (`'markdown'`).
*/
update(text, textFormat) {
this.emit({
type: 'typing',
text: text,
channelData: { streamType: 'informative' },
...(textFormat ? { textFormat } : {}),
});
}
/**
* Discard accumulated streamed text and any pending text deltas. The
* final message sent by `close()` will not include them. Intermediate
* typing chunks already shipped to Teams are not undone, but the final
* message updates the same activity id, so the user sees the cleared
* state. Pending non-message activities (typing updates, structured
* message emits that follow) are not affected.
*/
clearText() {
this.text = '';
// Drop queued text deltas so the next flush doesn't repopulate `text`.
this.queue = this.queue.filter((a) => a.type !== 'message');
}
/**
* Close the stream by sending the final message.
* Waits for all queued activities to flush.
* A Plan timeout or final Plan conflict discards the failed cycle and raises once.
* Further closes return undefined until the next emit or update starts a fresh cycle.
*/
async close() {
// Closing is idempotent until the next emit/update reopens the stream.
if (this.closed) {
this._logger.debug('already closed');
return this._result;
}
if (this._retired) {
this._logger.debug('failed stream cycle already retired, nothing to close');
return;
}
if (!this.index && !this.queue.length && !this._flushing) {
this._logger.debug('closed with no content');
return;
}
// Wait until all queued activities are flushed
const start = Date.now();
while (this.queue.length || !this.id || this._flushing) {
if (Date.now() - start > this._totalTimeout) {
this._logger.warn('Timeout while waiting for id and queue to flush');
return;
}
this._logger.debug('waiting for id to be set or queue to be empty');
await new Promise((resolve) => setTimeout(resolve, 100));
}
if (!this.id) {
this._logger.warn('no stream id set, cannot close stream');
return;
}
const finalAttachments = this.finalActivity?.attachments ?? [];
const finalEntities = this.finalActivity?.entities ?? [];
const finalSuggestedActions = this.finalActivity?.suggestedActions;
const finalTextFormat = this.finalActivity?.textFormat;
if (this.text === '' && !finalAttachments.length && !finalSuggestedActions) {
this._logger.warn('no text, attachments, or suggested actions to send, cannot close stream');
return;
}
let res;
if (this._timedOut) {
// Streaming already tripped the 10-minute limit; update the original message in place.
res = await this.sendFinal();
}
else {
// Build final message activity from the last-emitted message input (last wins),
// overlaying accumulated text, id, channelData, and the stream-final entity.
const activity = new teams_api_1.MessageActivityInput(this.text, { replyToId: this.finalActivity?.replyToId })
.withId(this.id)
.addAttachments(...finalAttachments)
.addEntities(...finalEntities)
.withChannelData(this.channelData)
.addStreamFinal();
if (finalTextFormat) {
activity.withTextFormat(finalTextFormat);
}
if (finalSuggestedActions) {
activity.withSuggestedActions(finalSuggestedActions);
}
try {
res = await this.sendWithRetry(activity);
}
catch (err) {
if (err instanceof types_1.StreamTimedOutError) {
// The final streamed send tripped the 10-minute limit. Update the original
// message in place with the buffered content: reuse the id and drop the
// streamInfo entity + stream channel data so this routes to update, not create.
res = await this.sendFinal();
}
else {
if (err instanceof types_1.PlanConflictStreamError && (0, teams_api_1.getPlanInfo)(activity)) {
this.resetCurrentStream();
this._retired = true;
}
throw err;
}
}
}
this.events.emit('close', res);
// Reset buffered message state; keep terminal status and the close result so
// repeated close() calls stay idempotent until the next emit/update.
this.index = 0;
this.id = undefined;
this.text = '';
this.channelData = {};
this.finalActivity = undefined;
this._result = res;
this._logger.debug(res);
return res;
}
/**
* Send through retry, excluding terminal stream errors and HTTP 409 Plan conflicts.
* @param activity ActivityParams to send.
*/
async sendWithRetry(activity) {
return utils_1.promises.retry(() => this.send(activity), {
logger: this._logger,
nonRetryable: [types_1.TerminalStreamError, types_1.PlanConflictStreamError],
});
}
/**
* Send the buffered content as a plain final message.
*
* Drops the `streaminfo` entity (added by `addStreamFinal()` on the normal
* close path) and the stream channel data so `id` is kept and the send routes
* through the update path instead of creating a duplicate message.
* Plan completion requires a POST: callers must resolve it through Plan.complete()
* after a timeout instead of retrying this ordinary-message fallback.
*/
async sendFinal() {
if ((0, teams_api_1.getPlanInfo)(this.finalActivity ?? {})) {
this.resetCurrentStream();
this._retired = true;
throw new types_1.StreamTimedOutError('Plan completion requires a POST; it cannot use the stream update fallback.');
}
const finalAttachments = this.finalActivity?.attachments ?? [];
const finalEntities = (this.finalActivity?.entities ?? []).filter((e) => e.type !== 'streaminfo');
const finalSuggestedActions = this.finalActivity?.suggestedActions;
const finalTextFormat = this.finalActivity?.textFormat;
const activity = {
type: 'message',
text: this.text,
replyToId: this.finalActivity?.replyToId,
attachments: finalAttachments,
entities: finalEntities,
};
if (this.id) {
activity.id = this.id;
}
if (finalSuggestedActions) {
activity.suggestedActions = finalSuggestedActions;
}
if (finalTextFormat) {
activity.textFormat = finalTextFormat;
}
return this.sendWithRetry(activity);
}
/**
* Prepare the stream instance to start a new stream cycle after close().
*/
resetForNextStream() {
this.resetCurrentStream();
this._result = undefined;
this._timedOut = false;
}
/**
* Flush queued activities.
* Drains the entire queue in a single pass.
*/
async flush() {
// if locked or no queue, return early
if (!this.queue.length || this._flushing)
return;
this._flushing = true;
try {
if (this._timeout) {
clearTimeout(this._timeout);
this._timeout = undefined;
}
const informativeUpdates = [];
const startLength = this.queue.length;
while (this.queue.length) {
const activity = this.queue.shift();
if (!activity)
continue;
if (activity.type === 'message') {
if (activity.text) {
this.text += activity.text;
}
// Last emitted message wins for attachments / entities / suggestedActions.
// Matches the Python streamer's `_final_activity` behavior.
this.finalActivity = activity;
}
if (activity.type === 'typing') {
if (activity.channelData?.streamType === 'informative' && this.text === '') {
informativeUpdates.push(activity);
}
}
if (activity.channelData) {
this.channelData = {
...this.channelData,
...activity.channelData,
};
}
}
if (startLength === 0)
return;
// Once the stream has timed out, stop sending chunks for this cycle.
if (this._timedOut)
return;
// Streamed text chunks use last-emitted-message-wins for textFormat (same as
// attachments/entities/etc.), so they render like the final message.
const textFormat = this.finalActivity?.textFormat;
// Send informative updates immediately. Each carries its own textFormat
// (finalActivity isn't set yet at this point), so read it off the update.
for (const informativeUpdate of informativeUpdates) {
const activity = new teams_api_1.TypingActivityInput()
.withText(informativeUpdate.text || '')
.withChannelData({ streamType: 'informative' });
if (informativeUpdate.textFormat) {
activity.withTextFormat(informativeUpdate.textFormat);
}
await this.pushStreamChunk(activity);
}
if (this.text) {
const activity = new teams_api_1.TypingActivityInput().withText(this.text);
if (textFormat) {
activity.withTextFormat(textFormat);
}
await this.pushStreamChunk(activity);
}
// Schedule another flush if queue is not empty
if (this.queue.length) {
this._timeout = setTimeout(this.flush.bind(this), 500);
}
}
catch (err) {
this._logger.error(err, 'flush failed');
}
finally {
this._flushing = false;
}
}
/**
* Push a new chunk to the stream.
* @param activity Typing activity input to send.
*/
async pushStreamChunk(activity) {
if (this.id) {
activity.id = this.id;
}
if (!activity.channelData) {
activity.channelData = {};
}
if (!activity.channelData.streamId) {
activity.channelData.streamId = activity.id;
}
if (!activity.channelData.streamType) {
activity.channelData.streamType = 'streaming';
}
activity.channelData.streamSequence = this.index + 1;
if (!activity.entities) {
activity.entities = [];
}
activity.entities.push({
type: 'streaminfo',
streamId: activity.id,
streamType: activity.channelData.streamType,
streamSequence: activity.channelData.streamSequence,
});
let res;
try {
res = await this.sendWithRetry(activity);
}
catch (err) {
// A timed-out chunk is swallowed here; close() sends the buffered content as a
// plain message once the stream has been marked timed out.
if (err instanceof types_1.StreamTimedOutError) {
return;
}
throw err;
}
this.events.emit('chunk', res);
this.index++;
if (!this.id) {
this.id = res.id;
}
}
/**
* Creates the first message of the stream as a reply in the reply chain (thread).
* In a channel, when the service answers HTTP 404 and the reply chain id is a plain non-zero number, creates the message in the inbound conversation instead.
* Any other error is thrown, including a 404 outside a channel.
*/
async createInReplyChain(replyChain, payload) {
try {
const res = await this.client.conversations.createReplyChainActivity(replyChain.chatOrChannelId, replyChain.replyChainId, payload);
return { ...payload, ...res };
}
catch (err) {
const id = replyChain.replyChainId;
const inChannel = this.ref.conversation?.conversationType === 'channel';
if (!inChannel || err?.response?.status !== 404 || !/^\d+$/.test(id) || /^0+$/.test(id)) {
throw err;
}
}
const res = await this.client.conversations.createActivity(this.ref.conversation.id, payload);
return { ...payload, ...res };
}
/**
* Send or update a streaming activity
* @param activity ActivityParams to send.
*/
async send(activity) {
const params = (0, teams_api_1.toActivityParams)(activity);
const payload = {
...params,
from: this.ref.bot,
conversation: this.ref.conversation,
replyToId: params.replyToId ?? this.ref.activityId,
};
try {
if (payload.id && !(payload.entities?.some((e) => e.type === 'streaminfo') || false)) {
const res = await this.client.conversations.updateActivity(this.ref.conversation.id, payload.id, payload);
return { ...payload, ...res };
}
if (this.replyChain && !payload.id) {
return await this.createInReplyChain(this.replyChain, payload);
}
const res = await this.client.conversations.createActivity(this.ref.conversation.id, payload);
return { ...payload, ...res };
}
catch (err) {
if ((0, axios_1.isAxiosError)(err) && err.response?.status === 409 && err.response.data?.error?.code === 'PlanConflict') {
throw new types_1.PlanConflictStreamError(err);
}
// Various error codes are used for streaming.
// https://learn.microsoft.com/en-us/microsoftteams/platform/bots/streaming-ux?tabs=csharp#error-codes
if (err?.response?.status === 403) {
const message = err?.response?.data?.error?.message ?? '';
const normalized = message.toLowerCase();
if (normalized.includes('exceeded streaming time')) {
this._timedOut = true;
this._logger.warn('The bot failed to complete the streaming process within the time limit of ten minutes from the first informative or content chunk.');
throw new types_1.StreamTimedOutError(message);
}
else if (normalized.includes('not allowed') && !normalized.includes('completed streamed message')) {
this._logger.warn('The streaming API isn\'t allowed for the user or bot.');
throw new types_1.StreamNotAllowedError(message);
}
this._logger.warn(`Teams returned a streaming error: ${message}`);
throw new types_1.TerminalStreamError(message);
}
throw err;
}
}
resetCurrentStream() {
this._retired = false;
this.index = 0;
this.id = undefined;
this.text = '';
this.channelData = {};
this.finalActivity = undefined;
this.queue = [];
}
}
exports.HttpStream = HttpStream;
//# 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