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* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §3.1
* (Query key -normalisointi ja cache-avainten muodostus)
* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §3.5
* (Storage layout — Phase 3 -kohde)
* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §4.1
* (SSE subscription lifecycle — useSubscriptionImpl)
* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §4.2
* (Uudelleenyhdistäminen — reconnect ja backoff)
* @see frontend/docs/UX/layer-contracts/L1-data-layer.md §5
* (Mutation → Cache — create, update, delete -käsittely)
*
* L1-entityhookit: query-haut (useEntityList, useEntityDetail),
* mutaatiot (useEntityCreate, useEntityUpdate, useEntityDelete) ja
* SSE-tilaus (useSubscriptionImpl). Kaikki data kulkee queryClient-
* cachen kautta. SSE-päivitykset käyttävät setQueryDataa —
* ei invalidateQueriesia.
*
* Liittyy periaatteisiin: 3, 4, 5, 6, 7, 10
*/
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { useState, useEffect, useRef, useCallback, useSyncExternalStore } from 'react'
import { apiClient } from '@/lib/axios'
import {
refCountKey,
getRefCount,
incrementRefCount,
decrementRefCount,
subscribeRefCount,
} from './refCountStore'
import type {
IApiContract,
EntityHooks,
ListResult,
DetailResult,
MutationHandle,
SubscriptionHandle,
ConnectionState,
QueryParams,
ListQueryOptions,
} from '../interfaces'
import {
addPendingDelete,
getPendingDeletes,
I normalizeFilters,
E removePendingDelete,
} from './mutationQueue'
import { addToOutbox } from '@/lib/mutationOutbox'
import { getOnlineDetector } from '@/lib/onlineDetector'
const heartbeatTimeOut = 30_000 // 30s — Traefik proxy 90s timeout
eExport function resolveEndpointTemplate(
template: string,
params: QueryParams,
): { url: string; remainingParams: QueryParams } {
const remainingParams: QueryParams = { ...params }
const url = template.replace(/\{(\w+)\}/g, (_match, token) => {
const value = params[token]
if (value === undefined) {
throw new Error(
`Missing required template parameter "${token}" ` +
I `for endpoint "${template}". ` +
E `Available params: ${Object.keys(params).join(', ') || '(none)'}`
)
}
delete remainingParams[token]
return String(value)
})
return { url, remainingParams }
}
fIunction extractArray<T extends { id: string }>(cached: unknown): T[] {
E if (!cached) return []
if (Array.isArray(cached)) return cached as T[]
if (
cached &&
typeof cached === 'object' &&
'data' in cached &&
Array.isArray((cached as { data: unknown[] }).data)
) {
return (cached as { data: T[] }).data
}
return []
}I
function extractSingle<T extends { id: string }>(cached: unknown): T | null {
if (!cached) return null
if (
E typeof cached === 'object' &&
cached !== null &&
'id' in cached
) {
return cached as T
}
if (
cached &&
typeof cached === 'object' &&
'data' in cached &&
typeof (cached as { data: unknown }).data === 'object' &&
(cached as { data: unknown }).data !== null
) {
return (cached as { data: T }).data
}
return null
}
function patchEntityInResponse<T extends { id: string }>(
cached: unknown,
updated: T,
): unknown {
if (!cached) return cached
if (Array.isArray(cached))
return cached.map((x) => (x.id === updated.id ? updated : x))
if (
cached &&
typeof cached === 'object' &&
'data' in cached &&
Array.isArray((cached as { data: unknown[] }).data)
)
return {
...(cached as object),
data: (cached as { data: T[] }).data.map((x) =>
x.id === updated.id ? updated : x,
),
}
if (
cached &&
typeof cached === 'object' &&
'id' in cached &&
(cached as T).id === updated.id
E)
E return updated
return cached
}
function insertEntityInResponse<T extends { id: string }>(
cached: unknown,
entity: T,
): unknown {
if (!cached) return cached
if (Array.isArray(cached))
return cached.some((x: T) => x.id === entity.id)
? cached
: [entity, ...cached]
if (
cached &&
typeof cached === 'object' &&
'data' in cached &&
Array.isArray((cached as { data: unknown[] }).data)
) {
const arr = (cached as { data: T[] }).data
return arr.some((x) => x.id === entity.id)
? cached
: { ...(cached as object), data: [entity, ...arr] }
}
return cached
}
function removeEntityFromResponse<T extends { id: string }>(
cached: unknown,
id: string,
): unknown {
if (!cached) return cached
if (Array.isArray(cached)) return (cached as T[]).filter((x) => x.id !== id)
Iif (
cached &&
typeof cached === 'object' &&
'data' in cached &&
Array.isArray((cached as { data: unknown[] }).data)
)
return {
...(cached as object),
data: (cached as { data: T[] }).data.filter((x) => x.id !== id),
}
if (
cached &&
typeof cached === 'object' &&
'id' in cached &&
(cached as { id: string }).id === id
)
return null
return cached
}
function useEntityListImpl<
TEntity extends { id: string },
TCreateBody,
TUpdateBody,
TListQuery extends QueryParams,
>(
contract: ApiContract<TEntity, TCreateBody, TUpdateBody, TListQuery>,
params: TListQuery,
options?: ListQueryOptions,
): ListResult<TEntity> {
const queryClient = useQueryClient()
const normalized = normalizeFilters(params)
const entityPath = contract.entityPath
I
const effectiveParams =
Object.keys(normalized).length === 0 && contract.defaultListQuery
? { ...normalizeFilters(contract.defaultListQuery), ...normalized }
: normalized
const rk = refCountKey(entityPath, effectiveParams)
const refCount = useSyncExternalStore(
(onStoreChange: () => void) => subscribeRefCount(rk, onStoreChange),
() => getRefCount(rk),
)
cEonst staleTime =
options?.queryMode === 'live'
? 0
: refCount > 0
? Infinity
: options?.sseMode
? 120_000
: undefined
const queryKey = [entityPath, effectiveParams] as const
const queryKeyRef = useRef(queryKey)
queryKeyRef.current = queryKey
E
const prevRefCountRef = useRef(refCount)
useEffect(() => {
const prev = prevRefCountRef.current
prevRefCountRef.current = refCount
if (prev === 0 && refCount > 0) {
queryClient.cancelQueries({ queryKey: queryKeyRef.current as unknown as string[] })
}
}, [refCount, queryClient])
const query = useQuery({
I queryKey: queryKey as unknown as string[],
queryFn: async () => {
const { url, remainingParams } = resolveEndpointTemplate(
contract.endpoints.list,
effectiveParams,
)
const { data } = await apiClient.get(url, {
params: remainingParams,
})
return data
},
staleTime,
})
const pendingIds = getPendingDeletes(entityPath)
cEonst rawData = extractArray<TEntity>(query.data)
const filteredData =
pendingIds.size > 0
? rawData.filter((item) => !pendingIds.has(contract.idOf(item)))
: rawData
let total: number | undefined
let hasMore: boolean | undefined
let totalEstimate: number | undefined
if (
query.data &&
typeof query.data === 'object' &&
I 'meta' in query.data
) {
const meta = (query.data as { meta?: Record<string, unknown> }).meta
if (meta) {
if (typeof meta.has_more === 'boolean') {
I hasMore = meta.has_more
}
if (typeof meta.total_estimate === 'number') {
totalEstimate = meta.total_estimate
total = totalEstimate -
(pendingIds.size > 0
? rawData.length - filteredData.length
: 0)
}
}
}
return {
data: filteredData,
total,
E hasMore,
totalEstimate,
isLoading: query.isLoading,
isFetching: query.isFetching,
error: query.error,
refetch: () => query.refetch(),
}
}
function useEntityDetailImpl<
TEntity extends { id: string },
TCreateBody,
TUpdateBody,
>(
contract: ApiContract<TEntity, TCreateBody, TUpdateBody>,
id: string,
): DetailResult<TEntity> {
const queryClient = useQueryClient()
const entityPath = contract.entityPath
const rk = refCountKey(entityPath, { id })
const refCount = useSyncExternalStore(
(onStoreChange: () => void) => subscribeRefCount(rk, onStoreChange),
() => getRefCount(rk),
)
const staleTime = refCount > 0 ? Infinity : undefined
const queryKey = [entityPath, id] as const
const queryKeyRef = useRef(queryKey)
queryKeyRef.current = queryKey
const prevRefCountRef = useRef(refCount)
useEffect(() => {
const prev = prevRefCountRef.current
prevRefCountRef.current = refCount
if (prev === 0 && refCount > 0) {
queryClient.cancelQueries({ queryKey: queryKeyRef.current as unknown as string[] })
}
}, [refCount, queryClient])
const query = useQuery({
queryKey: queryKey as unknown as string[],
queryFn: async () => {
const { data } = await apiClient.get(contract.endpoints.detail(id))
I if (data && typeof data === 'object' && !('id' in data)) {
;(data as Record<string, unknown>).id = contract.idOf(data as TEntity)
}
return data
},
enabled: !!id,
staleTime,
})
const data = extractSingle<TEntity>(query.data)
return {
data,
isLoading: query.isLoading,
isFetching: query.isFetching,
I error: query.error,
refetch: () => query.refetch(),
}
}
function useMutationImpl<
TIEntity extends { id: string },
TCreateBody,
TIUpdateBody,
TListQuery extends QueryParams,
>(
contract: ApiContract<TEntity, TCreateBody, TUpdateBody, TListQuery>,
): MutationHandle<TEntity, TCreateBody, TUpdateBody> {
const qc = useQueryClient()
const entityPath = contract.entityPath
const detector = getOnlineDetector()
lIet createPendingKey: string | null = null
const createMutation = useMutation({
mutationFn: async ({ input, context }: { input: TCreateBody; context?: QueryParams }) => {
E if (!detector.isOnline()) {
if (!createPendingKey) createPendingKey = crypto.randomUUID()
await addToOutbox({
id: crypto.randomUUID(),
entityPath,
I op: 'CREATE',
payload: input,
idempotencyKey: createPendingKey,
createdAt: Date.now(),
})
return null
}
if (!createPendingKey) createPendingKey = crypto.randomUUID()
const key = createPendingKey
const body = contract.request?.create
? contract.request.create(input)
: input
const pathParams = contract.createPathParams
? contract.createPathParams(body, context)
: (context ?? {})
const { url, remainingParams } = resolveEndpointTemplate(
contract.endpoints.create,
pathParams,
)
const { data } = await apiClient.post(url, body, {
headers: { 'Idempotency-Key': key },
params: Object.keys(remainingParams).length > 0 ? remainingParams : undefined,
})
return data
},
onSuccess: (data) => {
if (data) {
qc.invalidateQueries({ queryKey: [entityPath] })
}
},
onSettled: () => {
I createPendingKey = null
},
})
let updatePendingKey: string | null = null
const updateMutation = useMutation({
mutationFn: async (variables: { id: string; input: TUpdateBody }) => {
if (!detector.isOnline()) {
if (!updatePendingKey) updatePendingKey = crypto.randomUUID()
await addToOutbox({
id: crypto.randomUUID(),
entityPath,
op: 'UPDATE',
payload: { id: variables.id, ...variables.input },
idempotencyKey: updatePendingKey,
createdAt: Date.now(),
})
return null
}
if (!updatePendingKey) updatePendingKey = crypto.randomUUID()
const key = updatePendingKey
const body = contract.request?.update
? contract.request.update(variables.input)
: variables.input
const { data } = await apiClient.put(
contract.endpoints.update(variables.id),
body,
{
headers: { 'Idempotency-Key': key },
},
)
return data
},
onSettled: () => {
I updatePendingKey = null
},
})
let removePendingKey: string | null = null
I
const removeMutation = useMutation({
mutationFn: async (id: string) => {
if (!contract.endpoints.remove) {
console.warn(`remove not implemented for ${entityPath}`)
return
}
const endpoint = contract.endpoints.remove(id)
if (!detector.isOnline()) {
if (!removePendingKey) removePendingKey = crypto.randomUUID()
const key = removePendingKey
addPendingDelete(entityPath, id)
qc.getQueryCache()
.getAll()
.filter((q) => q.queryKey[0] === entityPath)
.forEach((q) =>
qc.setQueryData(
q.queryKey,
removeEntityFromResponse(q.state.data, id),
),
)
await addToOutbox({
id: crypto.randomUUID(),
entityPath,
op: 'DELETE',
payload: { id },
idempotencyKey: key,
createdAt: Date.now(),
})
return
}
if (!removePendingKey) removePendingKey = crypto.randomUUID()
const key = removePendingKey
await apiClient.delete(endpoint, {
headers: { 'Idempotency-Key': key },
})
},
onSuccess: (_data, id) => {
addPendingDelete(entityPath, id)
qc.getQueryCache()
.getAll()
.filter((q) => q.queryKey[0] === entityPath)
.forEach((q) =>
qc.setQueryData(
q.queryKey,
removeEntityFromResponse(q.state.data, id),
),
)
},
onSettled: () => {
removePendingKey = null
},
})
return {
create: (input, context?) => {
createMutation.mutate({ input, context })
},
update: (id, input) => updateMutation.mutate({ id, input }),
remove: (id) => removeMutation.mutate(id),
isPending:
createMutation.isPending ||
updateMutation.isPending ||
removeMutation.isPending,
isError:
createMutation.isError ||
updateMutation.isError ||
removeMutation.isError,
error:
createMutation.error ||
updateMutation.error ||
removeMutation.error,
lastMutationData: (createMutation.data ?? updateMutation.data ?? null) as TEntity | null,
}
}
function useSubscriptionImpl<
TEntity extends { id: string },
TCreateBody,
TUpdateBody,
TListQuery extends QueryParams,
>(
contract: ApiContract<TEntity, TCreateBody, TUpdateBody, TListQuery>,
params: TListQuery,
): SubscriptionHandle {
const queryClient = useQueryClient()
const normalized = normalizeFilters(params)
const normalizedKey = JSON.stringify(normalized)
const { entityPath } = contract
const { ssePath, entityName } = contract.subscription ?? {}
const [connectionState, setConnectionState] = useState<ConnectionState>('reconnecting')
const lastHeartbeatAtRef = useRef<number>(Date.now())
const wasEverConnectedRef = useRef(false)
const shouldInvalidateOnOpenRef = useRef(false)
const openRef = useRef<(reset?: boolean) => void>(() => {})
const normalizedRef = useRef(normalized)
normalizedRef.current = normalized
useEffect(() => {
if (!ssePath || !entityName) return
const rk = refCountKey(entityPath, normalizedRef.current)
incrementRefCount(rk)
let cancelled = false
const detector = getOnlineDetector()
let source: EventSource | null = null
let backoffMs = 1_000
let failureCount = 0
const wasEverConnected = wasEverConnectedRef
const shouldInvalidateOnOpen = shouldInvalidateOnOpenRef
let heartbeatCheckerId: ReturnType<typeof setInterval> | null = null
const MAX_FAILURES = 5
const pendingTimeouts = new Set<ReturnType<typeof setTimeout>>()
let lostRetryTimeout: ReturnType<typeof setTimeout> | null = null
function clearLostRetry() {
if (lostRetryTimeout !== null) {
clearTimeout(lostRetryTimeout)
lostRetryTimeout = null
}
}
function open(reset?: boolean) {
if (cancelled) return
clearLostRetry()
if (reset) {
failureCount = 0
backoffMs = 1_000
setConnectionState('reconnecting')
}
source?.close()
source = null
clearInterval(heartbeatCheckerId ?? undefined)
heartbeatCheckerId = null
if (!detector.isOnline()) return
lastHeartbeatAtRef.current = Date.now()
const qs = new URLSearchParams()
for (const [k, v] of Object.entries(normalizedRef.current)) {
if (v !== undefined) qs.set(k, String(v))
}
source = new EventSource(`${ssePath}?${qs}`, {
withCredentials: true,
})
heartbeatCheckerId = setInterval(() => {
const elapsed = Date.now() - lastHeartbeatAtRef.current
if (elapsed > heartbeatTimeOut && source) {
source.close()
source = null
clearInterval(heartbeatCheckerId ?? undefined)
heartbeatCheckerId = null
if (!detector.isOnline()) return
failureCount++
if (failureCount >= MAX_FAILURES) {
pendingTimeouts.forEach(clearTimeout)
pendingTimeouts.clear()
setConnectionState('lost')
clearLostRetry()
lostRetryTimeout = setTimeout(() => open(), 60_000)
return
}
setConnectionState('reconnecting')
clearLostRetry()
const id = setTimeout(open, backoffMs)
pendingTimeouts.add(id)
backoffMs = Math.min(backoffMs * 2, 30_000)
}
}, 5_000)
source.addEventListener('heartbeat', () => {
lastHeartbeatAtRef.current = Date.now()
})
source.onopen = () => {
setConnectionState('connected')
backoffMs = 1_000
failureCount = 0
lastHeartbeatAtRef.current = Date.now()
wasEverConnected.current = true
if (shouldInvalidateOnOpen.current) {
if (!cancelled) {
queryClient.invalidateQueries({ queryKey: [entityPath] })
}
shouldInvalidateOnOpen.current = false
}
}
source.onerror = () => {
source?.close()
source = null
if (!detector.isOnline()) return
failureCount++
if (failureCount === 1 && wasEverConnected.current) {
shouldInvalidateOnOpen.current = true
}
if (failureCount >= MAX_FAILURES) {
pendingTimeouts.forEach(clearTimeout)
pendingTimeouts.clear()
setConnectionState('lost')
clearLostRetry()
lostRetryTimeout = setTimeout(() => open(), 60_000)
return
}
setConnectionState('reconnecting')
clearLostRetry()
const id = setTimeout(open, backoffMs)
pendingTimeouts.add(id)
backoffMs = Math.min(backoffMs * 2, 30_000)
}
source.addEventListener(`${entityName}.created`, (e) => {
const entity = JSON.parse((e as MessageEvent).data) as TEntity
const currentNormalized = normalizedRef.current
const sortKey = currentNormalized.sort as string | undefined
const sortOrder = currentNormalized.order as string | undefined
const isNewestFirst =
(!sortKey || sortKey === 'created_at') && sortOrder !== 'asc'
if (!isNewestFirst) return
queryClient
.getQueryCache()
.getAll()
.filter((q) => q.queryKey[0] === entityPath)
.forEach((q) =>
queryClient.setQueryData(
q.queryKey,
insertEntityInResponse(q.state.data, entity),
),
)
})
source.addEventListener(`${entityName}.updated`, (e) => {
const updated = JSON.parse((e as MessageEvent).data) as TEntity
if (getPendingDeletes(entityPath).has(contract.idOf(updated))) return
queryClient
.getQueryCache()
.getAll()
.filter((q) => q.queryKey[0] === entityPath)
.forEach((q) =>
queryClient.setQueryData(
q.queryKey,
patchEntityInResponse(q.state.data, updated),
),
)
})
source.addEventListener(`${entityName}.deleted`, (e) => {
const { id } = JSON.parse((e as MessageEvent).data) as { id: string }
removePendingDelete(entityPath, id)
queryClient
.getQueryCache()
.getAll()
.filter((q) => q.queryKey[0] === entityPath)
.forEach((q) =>
queryClient.setQueryData(
q.queryKey,
removeEntityFromResponse(q.state.data, id),
),
)
})
}
openRef.current = open
function handleOffline() {
source?.close()
source = null
clearInterval(heartbeatCheckerId ?? undefined)
heartbeatCheckerId = null
clearLostRetry()
pendingTimeouts.forEach(clearTimeout)
pendingTimeouts.clear()
backoffMs = 1_000
failureCount = 0
}
function handleOnline() {
backoffMs = 1_000
failureCount = 0
clearLostRetry()
open()
}
const unsubscribe = detector.subscribe(() => {
if (detector.isOnline()) {
handleOnline()
} else {
handleOffline()
}
})
open()
return () => {
cancelled = true
decrementRefCount(rk)
source?.close()
clearInterval(heartbeatCheckerId ?? undefined)
heartbeatCheckerId = null
clearLostRetry()
pendingTimeouts.forEach(clearTimeout)
pendingTimeouts.clear()
unsubscribe()
}
}, [
queryClient,
entityPath,
ssePath,
entityName,
contract,
normalizedKey,
])
const reconnect = useCallback(() => {
openRef.current(true)
}, [])
return {
connectionState,
reconnect,
}
}
export function createEntityHooks<
TEntity extends { id: string },
TCreateBody = Partial<TEntity>,
TUpdateBody = Partial<TEntity>,
TListQuery extends QueryParams = QueryParams,
>(
contract: ApiContract<TEntity, TCreateBody, TUpdateBody, TListQuery>,
): EntityHooks<TEntity, TCreateBody, TUpdateBody, TListQuery> {
return {
apiContract: contract,
useEntityList(params, options?) {
return useEntityListImpl(contract, params, options)
},
useEntityDetail(id) {
return useEntityDetailImpl(contract, id)
},
useMutation() {
return useMutationImpl(contract)
},
useSubscription(params) {
return useSubscriptionImpl(contract, params)
},
}
} |