Ghost/ghost/email-service/lib/BatchSendingService.js
Steve Larson 22441fe730
Made lexical rendering async (#17438)
-moved lexical rendering to async
-includes rendering for front end and email
-necessary to pull dynamic data into render method, e.g. collections
2023-07-20 17:48:48 -05:00

625 lines
25 KiB
JavaScript

const logging = require('@tryghost/logging');
const ObjectID = require('bson-objectid').default;
const errors = require('@tryghost/errors');
const tpl = require('@tryghost/tpl');
const EmailBodyCache = require('./EmailBodyCache');
const messages = {
emailErrorPartialFailure: 'An error occurred, and your newsletter was only partially sent. Please retry sending the remaining emails.',
emailError: 'An unexpected error occurred, please retry sending your newsletter.'
};
const MAX_SENDING_CONCURRENCY = 2;
/**
* @typedef {import('./SendingService')} SendingService
* @typedef {import('./EmailSegmenter')} EmailSegmenter
* @typedef {import('./EmailRenderer')} EmailRenderer
* @typedef {import('./EmailRenderer').MemberLike} MemberLike
* @typedef {object} JobsService
* @typedef {object} Email
* @typedef {object} Newsletter
* @typedef {object} Post
* @typedef {object} EmailBatch
*/
class BatchSendingService {
#emailRenderer;
#sendingService;
#emailSegmenter;
#jobsService;
#models;
#db;
#sentry;
#debugStorageFilePath;
// Retry database queries happening before sending the email
#BEFORE_RETRY_CONFIG = {maxRetries: 10, maxTime: 10 * 60 * 1000, sleep: 2000};
#AFTER_RETRY_CONFIG = {maxRetries: 20, maxTime: 30 * 60 * 1000, sleep: 2000};
#MAILGUN_API_RETRY_CONFIG = {sleep: 10 * 1000, maxRetries: 6};
/**
* @param {Object} dependencies
* @param {EmailRenderer} dependencies.emailRenderer
* @param {SendingService} dependencies.sendingService
* @param {JobsService} dependencies.jobsService
* @param {EmailSegmenter} dependencies.emailSegmenter
* @param {object} dependencies.models
* @param {object} dependencies.models.EmailRecipient
* @param {EmailBatch} dependencies.models.EmailBatch
* @param {Email} dependencies.models.Email
* @param {object} dependencies.models.Member
* @param {object} dependencies.db
* @param {object} [dependencies.sentry]
* @param {object} [dependencies.BEFORE_RETRY_CONFIG]
* @param {object} [dependencies.AFTER_RETRY_CONFIG]
* @param {object} [dependencies.MAILGUN_API_RETRY_CONFIG]
* @param {string} [dependencies.debugStorageFilePath]
*/
constructor({
emailRenderer,
sendingService,
jobsService,
emailSegmenter,
models,
db,
sentry,
BEFORE_RETRY_CONFIG,
AFTER_RETRY_CONFIG,
MAILGUN_API_RETRY_CONFIG,
debugStorageFilePath
}) {
this.#emailRenderer = emailRenderer;
this.#sendingService = sendingService;
this.#jobsService = jobsService;
this.#emailSegmenter = emailSegmenter;
this.#models = models;
this.#db = db;
this.#sentry = sentry;
this.#debugStorageFilePath = debugStorageFilePath;
if (BEFORE_RETRY_CONFIG) {
this.#BEFORE_RETRY_CONFIG = BEFORE_RETRY_CONFIG;
} else {
if (process.env.NODE_ENV.startsWith('test') || process.env.NODE_ENV === 'development') {
this.#BEFORE_RETRY_CONFIG = {maxRetries: 0};
}
}
if (AFTER_RETRY_CONFIG) {
this.#AFTER_RETRY_CONFIG = AFTER_RETRY_CONFIG;
} else {
if (process.env.NODE_ENV.startsWith('test') || process.env.NODE_ENV === 'development') {
this.#AFTER_RETRY_CONFIG = {maxRetries: 0};
}
}
if (MAILGUN_API_RETRY_CONFIG) {
this.#MAILGUN_API_RETRY_CONFIG = MAILGUN_API_RETRY_CONFIG;
} else {
if (process.env.NODE_ENV.startsWith('test') || process.env.NODE_ENV === 'development') {
this.#MAILGUN_API_RETRY_CONFIG = {maxRetries: 0};
}
}
}
#getBeforeRetryConfig(email) {
if (email._retryCutOffTime) {
return {...this.#BEFORE_RETRY_CONFIG, stopAfterDate: email._retryCutOffTime};
}
return this.#BEFORE_RETRY_CONFIG;
}
/**
* Schedules a background job that sends the email in the background if it is pending or failed.
* @param {Email} email
* @returns {void}
*/
scheduleEmail(email) {
return this.#jobsService.addJob({
name: 'batch-sending-service-job',
job: this.emailJob.bind(this),
data: {emailId: email.id},
offloaded: false
});
}
/**
* @private
* @param {{emailId: string}} data Data passed from the job service. We only need the emailId because we need to refetch the email anyway to make sure the status is right and 'locked'.
*/
async emailJob({emailId}) {
logging.info(`Starting email job for email ${emailId}`);
// We'll stop all automatic DB retries after this date
const retryCutOffTime = new Date(Date.now() + this.#BEFORE_RETRY_CONFIG.maxTime);
// Check if email is 'pending' only + change status to submitting in one transaction.
// This allows us to have a lock around the email job that makes sure an email can only have one active job.
let email = await this.retryDb(
async () => {
return await this.updateStatusLock(this.#models.Email, emailId, 'submitting', ['pending', 'failed']);
},
{...this.#BEFORE_RETRY_CONFIG, description: `updateStatusLock email ${emailId} -> submitting`}
);
if (!email) {
logging.error(`Tried sending email that is not pending or failed ${emailId}`);
return;
}
// Save a strict cutoff time for retries
email._retryCutOffTime = retryCutOffTime;
try {
await this.sendEmail(email);
await this.retryDb(async () => {
await email.save({
status: 'submitted',
submitted_at: new Date(),
error: null
}, {patch: true, autoRefresh: false});
}, {...this.#AFTER_RETRY_CONFIG, description: `email ${emailId} -> submitted`});
} catch (e) {
const ghostError = new errors.EmailError({
err: e,
code: 'BULK_EMAIL_SEND_FAILED',
message: `Error sending email ${email.id}`
});
logging.error(ghostError);
if (this.#sentry) {
// Log the original error to Sentry
this.#sentry.captureException(e);
}
// Store error and status in email model
await this.retryDb(async () => {
await email.save({
status: 'failed',
error: e.message || 'Something went wrong while sending the email'
}, {patch: true, autoRefresh: false});
}, {...this.#AFTER_RETRY_CONFIG, description: `email ${emailId} -> failed`});
}
}
/**
* @private
* @param {Email} email
* @throws {errors.EmailError} If one of the batches fails
*/
async sendEmail(email) {
logging.info(`Sending email ${email.id}`);
// Load required relations
const newsletter = await this.retryDb(async () => {
return await email.getLazyRelation('newsletter', {require: true});
}, {...this.#getBeforeRetryConfig(email), description: `getLazyRelation newsletter for email ${email.id}`});
const post = await this.retryDb(async () => {
return await email.getLazyRelation('post', {require: true, withRelated: ['posts_meta', 'authors']});
}, {...this.#getBeforeRetryConfig(email), description: `getLazyRelation post for email ${email.id}`});
let batches = await this.retryDb(async () => {
return await this.getBatches(email);
}, {...this.#getBeforeRetryConfig(email), description: `getBatches for email ${email.id}`});
if (batches.length === 0) {
batches = await this.createBatches({email, newsletter, post});
}
await this.sendBatches({email, batches, post, newsletter});
}
/**
* @private
* @param {Email} email
* @returns {Promise<EmailBatch[]>}
*/
async getBatches(email) {
logging.info(`Getting batches for email ${email.id}`);
return await this.#models.EmailBatch.findAll({filter: 'email_id:' + email.id});
}
/**
* @private
* @param {{email: Email, newsletter: Newsletter, post: Post}} data
* @returns {Promise<EmailBatch[]>}
*/
async createBatches({email, post, newsletter}) {
logging.info(`Creating batches for email ${email.id}`);
const segments = await this.#emailRenderer.getSegments(post);
const batches = [];
const BATCH_SIZE = this.#sendingService.getMaximumRecipients();
let totalCount = 0;
for (const segment of segments) {
logging.info(`Creating batches for email ${email.id} segment ${segment}`);
const segmentFilter = this.#emailSegmenter.getMemberFilterForSegment(newsletter, email.get('recipient_filter'), segment);
// Avoiding Bookshelf for performance reasons
let members;
// Start with the id of the email, which is an objectId. We'll only fetch members that are created before the email. This is a special property of ObjectIds.
// Note: we use ID and not created_at, because imported members could set a created_at in the future or past and avoid limit checking.
let lastId = email.id;
while (!members || lastId) {
logging.info(`Fetching members batch for email ${email.id} segment ${segment}, lastId: ${lastId}`);
const filter = segmentFilter + `+id:<${lastId}`;
members = await this.#models.Member.getFilteredCollectionQuery({filter})
.orderByRaw('id DESC')
.select('members.id', 'members.uuid', 'members.email', 'members.name').limit(BATCH_SIZE + 1);
if (members.length > 0) {
totalCount += Math.min(members.length, BATCH_SIZE);
const batch = await this.retryDb(
async () => {
return await this.createBatch(email, segment, members.slice(0, BATCH_SIZE));
},
{...this.#getBeforeRetryConfig(email), description: `createBatch email ${email.id} segment ${segment}`}
);
batches.push(batch);
}
if (members.length > BATCH_SIZE) {
lastId = members[members.length - 2].id;
} else {
break;
}
}
}
logging.info(`Created ${batches.length} batches for email ${email.id} with ${totalCount} recipients`);
if (email.get('email_count') !== totalCount) {
logging.error(`Email ${email.id} has wrong stored email_count ${email.get('email_count')}, did expect ${totalCount}. Updating the model.`);
// We update the email model because this might happen in rare cases where the initial member count changed (e.g. deleted members)
// between creating the email and sending it
await email.save({
email_count: totalCount
}, {patch: true, require: false, autoRefresh: false});
}
return batches;
}
/**
* @private
* @param {Email} email
* @param {import('./EmailRenderer').Segment} segment
* @param {object[]} members
* @returns {Promise<EmailBatch>}
*/
async createBatch(email, segment, members, options) {
if (!options || !options.transacting) {
return this.#models.EmailBatch.transaction(async (transacting) => {
return this.createBatch(email, segment, members, {transacting});
});
}
logging.info(`Creating batch for email ${email.id} segment ${segment} with ${members.length} members`);
const batch = await this.#models.EmailBatch.add({
email_id: email.id,
member_segment: segment,
status: 'pending'
}, options);
const recipientData = [];
members.forEach((memberRow) => {
if (!memberRow.id || !memberRow.uuid || !memberRow.email) {
logging.warn(`Member row not included as email recipient due to missing data - id: ${memberRow.id}, uuid: ${memberRow.uuid}, email: ${memberRow.email}`);
return;
}
recipientData.push({
id: ObjectID().toHexString(),
email_id: email.id,
member_id: memberRow.id,
batch_id: batch.id,
member_uuid: memberRow.uuid,
member_email: memberRow.email,
member_name: memberRow.name
});
});
const insertQuery = this.#db.knex('email_recipients').insert(recipientData);
if (options.transacting) {
insertQuery.transacting(options.transacting);
}
logging.info(`Inserting ${recipientData.length} recipients for email ${email.id} batch ${batch.id}`);
await insertQuery;
return batch;
}
async sendBatches({email, batches, post, newsletter}) {
logging.info(`Sending ${batches.length} batches for email ${email.id}`);
// Reuse same HTML body if we send an email to the same segment
const emailBodyCache = new EmailBodyCache();
// Loop batches and send them via the EmailProvider
let succeededCount = 0;
const queue = batches.slice();
// Bind this
let runNext;
runNext = async () => {
const batch = queue.shift();
if (batch) {
if (await this.sendBatch({email, batch, post, newsletter, emailBodyCache})) {
succeededCount += 1;
}
await runNext();
}
};
// Run maximum MAX_SENDING_CONCURRENCY at the same time
await Promise.all(new Array(MAX_SENDING_CONCURRENCY).fill(0).map(() => runNext()));
if (succeededCount < batches.length) {
if (succeededCount > 0) {
throw new errors.EmailError({
message: tpl(messages.emailErrorPartialFailure)
});
}
throw new errors.EmailError({
message: tpl(messages.emailError)
});
}
}
/**
*
* @param {{email: Email, batch: EmailBatch, post: Post, newsletter: Newsletter}} data
* @returns {Promise<boolean>} True when succeeded, false when failed with an error
*/
async sendBatch({email, batch: originalBatch, post, newsletter, emailBodyCache}) {
logging.info(`Sending batch ${originalBatch.id} for email ${email.id}`);
// Check the status of the email batch in a 'for update' transaction
const batch = await this.retryDb(
async () => {
return await this.updateStatusLock(this.#models.EmailBatch, originalBatch.id, 'submitting', ['pending', 'failed']);
},
{...this.#getBeforeRetryConfig(email), description: `updateStatusLock batch ${originalBatch.id} -> submitting`}
);
if (!batch) {
logging.error(`Tried sending email batch that is not pending or failed ${originalBatch.id}`);
return true;
}
let succeeded = false;
try {
let members = await this.retryDb(
async () => {
const m = await this.getBatchMembers(batch.id);
// If we receive 0 rows, there is a possibility that we switched to a secondary database and have replication lag
// So we throw an error and we retry
if (m.length === 0) {
throw new errors.EmailError({
message: `No members found for batch ${batch.id}, possible replication lag`
});
}
return m;
},
{...this.#getBeforeRetryConfig(email), description: `getBatchMembers batch ${originalBatch.id}`}
);
const response = await this.retryDb(async () => {
return await this.#sendingService.send({
emailId: email.id,
post,
newsletter,
segment: batch.get('member_segment'),
members
}, {
openTrackingEnabled: !!email.get('track_opens'),
clickTrackingEnabled: !!email.get('track_clicks'),
emailBodyCache
});
}, {...this.#MAILGUN_API_RETRY_CONFIG, description: `Sending email batch ${originalBatch.id}`});
succeeded = true;
await this.retryDb(
async () => {
await batch.save({
status: 'submitted',
provider_id: response.id,
// reset error fields when sending succeeds
error_status_code: null,
error_message: null,
error_data: null
}, {patch: true, require: false, autoRefresh: false});
},
{...this.#AFTER_RETRY_CONFIG, description: `save batch ${originalBatch.id} -> submitted`}
);
} catch (err) {
if (err.code && err.code === 'BULK_EMAIL_SEND_FAILED') {
logging.error(err);
if (this.#sentry) {
// Log the original error to Sentry
this.#sentry.captureException(err);
}
} else {
const ghostError = new errors.EmailError({
err,
code: 'BULK_EMAIL_SEND_FAILED',
message: `Error sending email batch ${batch.id}`,
context: err.message
});
logging.error(ghostError);
if (this.#sentry) {
// Log the original error to Sentry
this.#sentry.captureException(err);
}
}
if (!succeeded) {
// We check succeeded because a Rare edge case where the batch was send, but we failed to set status to submitted, then we don't want to set it to failed
await this.retryDb(
async () => {
await batch.save({
status: 'failed',
error_status_code: err.statusCode ?? null,
error_message: err.message,
error_data: err.errorDetails ?? null
}, {patch: true, require: false, autoRefresh: false});
},
{...this.#AFTER_RETRY_CONFIG, description: `save batch ${originalBatch.id} -> failed`}
);
}
}
// Mark as processed, even when failed
await this.retryDb(
async () => {
await this.#models.EmailRecipient
.where({batch_id: batch.id})
.save({processed_at: new Date()}, {patch: true, require: false, autoRefresh: false});
},
{...this.#AFTER_RETRY_CONFIG, description: `save EmailRecipients ${originalBatch.id} processed_at`}
);
return succeeded;
}
/**
* We don't want to pass EmailRecipient models to the sendingService.
* So we transform them into the MemberLike interface.
* That keeps the sending service nicely separated so it isn't dependent on the batch sending data structure.
* @returns {Promise<MemberLike[]>}
*/
async getBatchMembers(batchId) {
let models = await this.#models.EmailRecipient.findAll({filter: `batch_id:${batchId}`, withRelated: ['member', 'member.stripeSubscriptions', 'member.products']});
const BATCH_SIZE = this.#sendingService.getMaximumRecipients();
if (models.length > BATCH_SIZE) {
// @NOTE: filtering by batch_id is our best effort to "correct" returned data
logging.warn(`Email batch ${batchId} has ${models.length} members, which exceeds the maximum of ${BATCH_SIZE} members per batch. Filtering by batch_id: ${batchId}`);
models = models.filter(m => m.get('batch_id') === batchId);
if (models.length > BATCH_SIZE) {
// @NOTE this is a best effort logic to still try sending an email batch
// even if it exceeds the maximum recipients limit of the sending service.
// In theory this should never happen, but being extra safe to make sure
// the email delivery still happens.
logging.error(`Email batch ${batchId} has ${models.length} members, which exceeds the maximum of ${BATCH_SIZE}. Truncating to ${BATCH_SIZE}`);
models = models.slice(0, BATCH_SIZE);
}
}
return models.map((model) => {
// Map subscriptions
const subscriptions = model.related('member').related('stripeSubscriptions').toJSON();
const tiers = model.related('member').related('products').toJSON();
return {
id: model.get('member_id'),
uuid: model.get('member_uuid'),
email: model.get('member_email'),
name: model.get('member_name'),
createdAt: model.related('member')?.get('created_at') ?? null,
status: model.related('member')?.get('status') ?? 'free',
subscriptions,
tiers
};
});
}
/**
* @private
* Update the status of an email or emailBatch to a given status, but first check if their current status is 'pending' or 'failed'.
* @param {object} Model Bookshelf model constructor
* @param {string} id id of the model
* @param {string} status set the status of the model to this value
* @param {string[]} allowedStatuses Check if the models current status is one of these values
* @returns {Promise<object|undefined>} The updated model. Undefined if the model didn't pass the status check.
*/
async updateStatusLock(Model, id, status, allowedStatuses) {
let model;
await Model.transaction(async (transacting) => {
model = await Model.findOne({id}, {require: true, transacting, forUpdate: true});
if (!allowedStatuses.includes(model.get('status'))) {
model = undefined;
return;
}
await model.save({
status
}, {patch: true, transacting, autoRefresh: false});
});
return model;
}
/**
* @private
* Retry a function until it doesn't throw an error or the max retries / max time are reached.
* @template T
* @param {() => Promise<T>} func
* @param {object} options
* @param {string} options.description Used for logging
* @param {number} options.sleep time between each retry (ms), will get multiplied by the number of retries
* @param {number} options.maxRetries note: retries, not tries. So 0 means maximum 1 try, 1 means maximum 2 tries, etc.
* @param {number} [options.retryCount] (internal) Amount of retries already done. 0 intially.
* @param {number} [options.maxTime] (ms)
* @param {Date} [options.stopAfterDate]
* @returns {Promise<T>}
*/
async retryDb(func, options) {
if (options.maxTime !== undefined) {
const stopAfterDate = new Date(Date.now() + options.maxTime);
if (!options.stopAfterDate || stopAfterDate < options.stopAfterDate) {
options = {...options, stopAfterDate};
}
}
try {
return await func();
} catch (e) {
const retryCount = (options.retryCount ?? 0);
const sleep = (options.sleep ?? 0);
if (retryCount >= options.maxRetries || (options.stopAfterDate && (new Date(Date.now() + sleep)) > options.stopAfterDate)) {
if (retryCount > 0) {
const ghostError = new errors.EmailError({
err: e,
code: 'BULK_EMAIL_DB_RETRY',
message: `[BULK_EMAIL_DB_RETRY] ${options.description} - Stopped retrying`,
context: e.message
});
logging.error(ghostError);
}
throw e;
}
const ghostError = new errors.EmailError({
err: e,
code: 'BULK_EMAIL_DB_RETRY',
message: `[BULK_EMAIL_DB_RETRY] ${options.description} - After ${retryCount} retries`,
context: e.message
});
logging.error(ghostError);
if (sleep) {
await new Promise((resolve) => {
setTimeout(resolve, sleep);
});
}
return await this.retryDb(func, {...options, retryCount: retryCount + 1, sleep: sleep * 2});
}
}
}
module.exports = BatchSendingService;