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chat_service.js
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chat_service.js
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import _ from 'lodash'
const empty = (chatId) => {
return {
idIndex: {},
idempotencyKeyIndex: {},
messages: [],
newMessageCount: 0,
lastSeenMessageId: '0',
chatId: chatId,
minId: undefined,
maxId: undefined
}
}
const clear = (storage) => {
const failedMessageIds = []
for (const message of storage.messages) {
if (message.error) {
failedMessageIds.push(message.id)
} else {
delete storage.idIndex[message.id]
delete storage.idempotencyKeyIndex[message.idempotency_key]
}
}
storage.messages = storage.messages.filter(m => failedMessageIds.includes(m.id))
storage.newMessageCount = 0
storage.lastSeenMessageId = '0'
storage.minId = undefined
storage.maxId = undefined
}
const deleteMessage = (storage, messageId) => {
if (!storage) { return }
storage.messages = storage.messages.filter(m => m.id !== messageId)
delete storage.idIndex[messageId]
if (storage.maxId === messageId) {
const lastMessage = _.maxBy(storage.messages, 'id')
storage.maxId = lastMessage.id
}
if (storage.minId === messageId) {
const firstMessage = _.minBy(storage.messages, 'id')
storage.minId = firstMessage.id
}
}
const cullOlderMessages = (storage) => {
const maxIndex = storage.messages.length
const minIndex = maxIndex - 50
if (maxIndex <= 50) return
storage.messages = _.sortBy(storage.messages, ['id'])
storage.minId = storage.messages[minIndex].id
for (const message of storage.messages) {
if (message.id < storage.minId) {
delete storage.idIndex[message.id]
delete storage.idempotencyKeyIndex[message.idempotency_key]
}
}
storage.messages = storage.messages.slice(minIndex, maxIndex)
}
const handleMessageError = (storage, fakeId, isRetry) => {
if (!storage) { return }
const fakeMessage = storage.idIndex[fakeId]
if (fakeMessage) {
fakeMessage.error = true
fakeMessage.pending = false
if (!isRetry) {
// Ensure the failed message doesn't stay at the bottom of the list.
const lastPersistedMessage = _.orderBy(storage.messages, ['pending', 'id'], ['asc', 'desc'])[0]
if (lastPersistedMessage) {
const oldId = fakeMessage.id
fakeMessage.id = `${lastPersistedMessage.id}-${new Date().getTime()}`
storage.idIndex[fakeMessage.id] = fakeMessage
delete storage.idIndex[oldId]
}
}
}
}
const add = (storage, { messages: newMessages, updateMaxId = true }) => {
if (!storage) { return }
for (let i = 0; i < newMessages.length; i++) {
const message = newMessages[i]
// sanity check
if (message.chat_id !== storage.chatId) { return }
if (message.fakeId) {
const fakeMessage = storage.idIndex[message.fakeId]
if (fakeMessage) {
// In case the same id exists (chat update before POST response)
// make sure to remove the older duplicate message.
if (storage.idIndex[message.id]) {
delete storage.idIndex[message.id]
storage.messages = storage.messages.filter(msg => msg.id !== message.id)
}
Object.assign(fakeMessage, message, { error: false })
delete fakeMessage['fakeId']
storage.idIndex[fakeMessage.id] = fakeMessage
delete storage.idIndex[message.fakeId]
return
}
}
if (!storage.minId || (!message.pending && message.id < storage.minId)) {
storage.minId = message.id
}
if (!storage.maxId || message.id > storage.maxId) {
if (updateMaxId) {
storage.maxId = message.id
}
}
if (!storage.idIndex[message.id] && !isConfirmation(storage, message)) {
if (storage.lastSeenMessageId < message.id) {
storage.newMessageCount++
}
storage.idIndex[message.id] = message
storage.messages.push(storage.idIndex[message.id])
storage.idempotencyKeyIndex[message.idempotency_key] = true
}
}
}
const isConfirmation = (storage, message) => {
if (!message.idempotency_key) return
return storage.idempotencyKeyIndex[message.idempotency_key]
}
const resetNewMessageCount = (storage) => {
if (!storage) { return }
storage.newMessageCount = 0
storage.lastSeenMessageId = storage.maxId
}
// Inserts date separators and marks the head and tail if it's the chain of messages made by the same user
const getView = (storage) => {
if (!storage) { return [] }
const result = []
const messages = _.orderBy(storage.messages, ['pending', 'id'], ['asc', 'asc'])
const firstMessage = messages[0]
let previousMessage = messages[messages.length - 1]
let currentMessageChainId
if (firstMessage) {
const date = new Date(firstMessage.created_at)
date.setHours(0, 0, 0, 0)
result.push({
type: 'date',
date,
id: date.getTime().toString()
})
}
let afterDate = false
for (let i = 0; i < messages.length; i++) {
const message = messages[i]
const nextMessage = messages[i + 1]
const date = new Date(message.created_at)
date.setHours(0, 0, 0, 0)
// insert date separator and start a new message chain
if (previousMessage && previousMessage.date < date) {
result.push({
type: 'date',
date,
id: date.getTime().toString()
})
previousMessage['isTail'] = true
currentMessageChainId = undefined
afterDate = true
}
const object = {
type: 'message',
data: message,
date,
id: message.id,
messageChainId: currentMessageChainId
}
// end a message chian
if ((nextMessage && nextMessage.account_id) !== message.account_id) {
object['isTail'] = true
currentMessageChainId = undefined
}
// start a new message chain
if ((previousMessage && previousMessage.data && previousMessage.data.account_id) !== message.account_id || afterDate) {
currentMessageChainId = _.uniqueId()
object['isHead'] = true
object['messageChainId'] = currentMessageChainId
}
result.push(object)
previousMessage = object
afterDate = false
}
return result
}
const ChatService = {
add,
empty,
getView,
deleteMessage,
cullOlderMessages,
resetNewMessageCount,
clear,
handleMessageError
}
export default ChatService

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chat_service.js (6 KB)

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