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import {
MultipartPartsResponse as GeneratedMultipartPartsResponse,
MultipartStatusResponse as GeneratedMultipartStatusResponse,
api as generatedApi,
PurposeEnum,
} from "@/api/apiStore.gen";
import { store } from "@/store/store";
import {
createProgressSnapshot,
uploadMultipartParts,
} from "./multipartUpload";
import {
clearResumeState,
createResumeState,
loadResumeState,
resumeStateMatchesContext,
resumeStateMatchesFile,
saveResumeState,
} from "./storage";
import type {
CompletedMultipartUpload,
MultipartStatusResponse,
MultipartUploadApi,
MultipartUploadContext,
MultipartUploadProgress,
MultipartUploadResumeState,
MultipartUploadSessionStatus,
ResumableMultipartUploadState,
} from "./types";
const EMPTY_PROGRESS: MultipartUploadProgress = {
uploadedBytes: 0,
totalBytes: 0,
uploadedParts: 0,
totalParts: 0,
percentage: 0,
};
type FailedServerResumeStatus = Extract<
MultipartUploadSessionStatus,
"aborted" | "failed" | "expired"
>;
class ServerUploadSessionTerminalError extends Error {
recoveredStatus: Extract<
ResumableMultipartUploadState["status"],
"aborted" | "failed"
>;
constructor(
readonly serverStatus: FailedServerResumeStatus,
message: string,
) {
super(message);
this.name = "ServerUploadSessionTerminalError";
this.recoveredStatus = serverStatus === "aborted" ? "aborted" : "failed";
}
}
/** Wire an AbortSignal into RTK Query's abortable request handle. */
function bindAbort(
signal: AbortSignal | undefined,
abortRequest: () => void,
): (() => void) | undefined {
if (!signal) {
return undefined;
}
if (signal.aborted) {
abortRequest();
return undefined;
}
const abortHandler = () => {
abortRequest();
};
signal.addEventListener("abort", abortHandler, { once: true });
return () => signal.removeEventListener("abort", abortHandler);
}
/** Await an RTK Query request while respecting any external AbortSignal. */
async function runRequest<T>(
request: { unwrap: () => Promise<T>; abort: () => void },
signal?: AbortSignal,
): Promise<T> {
const unbindAbort = bindAbort(signal, request.abort);
try {
return await request.unwrap();
} finally {
unbindAbort?.();
}
}
/**
* Build the shared upload API adapter from the generated RTK Query endpoints.
* This keeps all generated-client shape quirks in one place instead of spreading
* them across the ML and MSS components.
*/
function createGeneratedMultipartUploadApi(): MultipartUploadApi {
return {
initiateMultipartUpload(request, signal) {
const initiatedRequest = store.dispatch(
generatedApi.endpoints.uploadsMultipartInitiateCreate.initiate({
initiateMultipartUpload: {
...request,
purpose:
request.purpose === "ml_training_csv"
? PurposeEnum.MlTrainingCsv
: request.purpose === "scenario_csv"
? PurposeEnum.ScenarioCsv
: PurposeEnum.PinchUtilityCsv,
},
}),
);
return runRequest(initiatedRequest, signal).then((response) => ({
...response,
upload_session_id: String(response.upload_session_id),
}));
},
async getMultipartPartUrls(uploadSessionId, partNumbers, signal) {
const initiatedRequest = store.dispatch(
generatedApi.endpoints.uploadsMultipartPartsCreate.initiate({
multipartParts: {
upload_session_id: Number(uploadSessionId),
part_numbers: partNumbers,
},
}),
);
const response = await runRequest<GeneratedMultipartPartsResponse>(
initiatedRequest,
signal,
);
return { urls: response.urls as Record<number, string> };
},
getMultipartUploadStatus(uploadSessionId, signal) {
const initiatedRequest = store.dispatch(
generatedApi.endpoints.uploadsMultipartStatusRetrieve.initiate({
uploadSessionId: Number(uploadSessionId),
}),
);
return runRequest<GeneratedMultipartStatusResponse>(
initiatedRequest,
signal,
).then((response) => ({
...response,
status: response.status as MultipartUploadSessionStatus,
}));
},
completeMultipartUpload(request, signal) {
const initiatedRequest = store.dispatch(
generatedApi.endpoints.uploadsMultipartCompleteCreate.initiate({
completeMultipartUpload: {
upload_session_id: Number(request.upload_session_id),
parts: request.parts,
},
}),
);
return runRequest(initiatedRequest, signal).then((response) => ({
...response,
etag: response.etag ?? undefined,
}));
},
abortMultipartUpload(uploadSessionId, signal) {
const initiatedRequest = store.dispatch(
generatedApi.endpoints.uploadsMultipartAbortCreate.initiate({
abortMultipartUpload: {
upload_session_id: Number(uploadSessionId),
},
}),
);
return runRequest(initiatedRequest, signal).then(() => undefined);
},
};
}
/** Create the UI state for either a fresh page load or a recovered resume payload. */
function createInitialState(
resumeState: MultipartUploadResumeState | null,
): ResumableMultipartUploadState {
if (!resumeState) {
return {
status: "idle",
error: null,
uploadSessionId: null,
fileName: null,
progress: EMPTY_PROGRESS,
resumeState: null,
};
}
return {
status:
resumeState.upload_phase === "uploaded" ? "uploaded" : "resume_available",
error: null,
uploadSessionId: resumeState.upload_session_id,
fileName: resumeState.original_filename,
progress:
resumeState.upload_phase === "uploaded"
? getCompletedProgress(resumeState.file.size, resumeState.file.size)
: {
...EMPTY_PROGRESS,
totalBytes: resumeState.file.size,
},
resumeState,
};
}
function getErrorMessage(error: unknown): string {
if (error instanceof DOMException && error.name === "AbortError") {
return "Upload cancelled.";
}
if (error instanceof Error) {
return error.message;
}
return "The upload could not be completed.";
}
/** Build a completed progress snapshot once the browser no longer has in-flight parts. */
function getCompletedProgress(
fileSize: number,
partSizeBytes: number,
): MultipartUploadProgress {
const totalParts =
partSizeBytes > 0 ? Math.ceil(fileSize / partSizeBytes) : 0;
// Once completion is confirmed, the browser can present the upload as fully transferred.
return {
uploadedBytes: fileSize,
totalBytes: fileSize,
uploadedParts: totalParts,
totalParts,
percentage: 100,
};
}
function getServerTerminalResumeMessage(
status: FailedServerResumeStatus,
): string {
switch (status) {
case "aborted":
return "This upload was already cancelled on the server. Choose the CSV again to start over.";
case "failed":
return "This upload already failed on the server. Choose the CSV again to start over.";
case "expired":
return "This upload session expired before it completed. Choose the CSV again to start over.";
}
}
function getResumeDisallowedStatus(
statusResponse: MultipartStatusResponse,
): FailedServerResumeStatus | null {
if (
statusResponse.status === "aborted" ||
statusResponse.status === "failed" ||
statusResponse.status === "expired"
) {
return statusResponse.status;
}
if (
!statusResponse.can_resume &&
(statusResponse.status === "initiated" ||
statusResponse.status === "uploading")
) {
return "expired";
}
return null;
}
/**
* Shared resumable multipart upload hook used by both ML and MSS CSV flows.
* It owns localStorage resume state, server reconciliation, progress reporting,
* abort handling, and final completion metadata.
*/
export function useResumableMultipartUpload({
storageKey,
context,
api,
}: {
storageKey: string;
context: MultipartUploadContext;
api?: MultipartUploadApi;
}) {
const activeControllerRef = useRef<AbortController | null>(null);
const multipartUploadApi = useRef(
api ?? createGeneratedMultipartUploadApi(),
).current;
const [state, setState] = useState<ResumableMultipartUploadState>(() => {
const persistedState = loadResumeState(storageKey);
return createInitialState(
persistedState && resumeStateMatchesContext(persistedState, context)
? persistedState
: null,
);
});
useEffect(() => {
const persistedState = loadResumeState(storageKey);
if (
!persistedState ||
!resumeStateMatchesContext(persistedState, context)
) {
setState(createInitialState(null));
return;
}
setState(createInitialState(persistedState));
}, [context, storageKey]);
useEffect(() => {
const resumeState = state.resumeState;
if (!resumeState || resumeState.upload_phase === "uploaded") {
return;
}
let isCancelled = false;
multipartUploadApi
.getMultipartUploadStatus(resumeState.upload_session_id)
.then((statusResponse) => {
if (isCancelled) {
return;
}
const disallowedResumeStatus =
getResumeDisallowedStatus(statusResponse);
if (disallowedResumeStatus) {
clearResumeState(storageKey);
setState({
status: disallowedResumeStatus === "aborted" ? "aborted" : "failed",
error: getServerTerminalResumeMessage(disallowedResumeStatus),
uploadSessionId: null,
fileName: resumeState.original_filename,
progress: {
...EMPTY_PROGRESS,
totalBytes: resumeState.file.size,
},
resumeState: null,
});
return;
}
if (statusResponse.status === "completed") {
const uploadedState = {
...resumeState,
upload_phase: "uploaded" as const,
};
saveResumeState(storageKey, uploadedState);
setState({
status: "uploaded",
error: null,
uploadSessionId: resumeState.upload_session_id,
fileName: resumeState.original_filename,
progress: getCompletedProgress(
resumeState.file.size,
statusResponse.part_size_bytes,
),
resumeState: uploadedState,
});
return;
}
const totalParts =
statusResponse.part_size_bytes > 0
? Math.ceil(resumeState.file.size / statusResponse.part_size_bytes)
: 0;
const uploadedBytes = statusResponse.uploaded_parts.reduce(
(total, part) => total + part.size_bytes,
0,
);
setState((currentState) =>
currentState.resumeState?.upload_session_id !==
resumeState.upload_session_id
? currentState
: {
...currentState,
progress: createProgressSnapshot(
uploadedBytes,
resumeState.file.size,
statusResponse.uploaded_parts.length,
totalParts,
),
},
);
})
.catch(() => {
// Leave the stored total size visible even if the status refresh fails.
});
return () => {
isCancelled = true;
};
}, [multipartUploadApi, state.resumeState, storageKey]);
async function startUpload(file: File): Promise<CompletedMultipartUpload> {
const persistedState = loadResumeState(storageKey);
const matchingPersistedState =
persistedState && resumeStateMatchesContext(persistedState, context)
? persistedState
: null;
if (
matchingPersistedState &&
!resumeStateMatchesFile(matchingPersistedState, file)
) {
setState((currentState) => ({
...currentState,
status: "failed",
error:
"A saved upload exists for a different file. Clear it before starting a new upload.",
}));
throw new Error(
"A saved upload exists for a different file. Clear it before starting a new upload.",
);
}
if (matchingPersistedState?.upload_phase === "uploaded") {
setState({
status: "uploaded",
error: null,
uploadSessionId: matchingPersistedState.upload_session_id,
fileName: file.name,
progress: getCompletedProgress(file.size, file.size),
resumeState: matchingPersistedState,
});
return {
upload_session_id: matchingPersistedState.upload_session_id,
bucket: "",
object_key: "",
size_bytes: file.size,
original_filename: file.name,
};
}
const controller = new AbortController();
activeControllerRef.current = controller;
setState((currentState) => ({
...currentState,
status: "uploading",
error: null,
fileName: file.name,
progress: {
uploadedBytes: 0,
totalBytes: file.size,
uploadedParts: 0,
totalParts: 0,
percentage: 0,
},
}));
try {
let uploadSessionId = matchingPersistedState?.upload_session_id;
let partSizeBytes = 0;
let uploadedParts = [] as Awaited<
ReturnType<typeof multipartUploadApi.getMultipartUploadStatus>
>["uploaded_parts"];
if (uploadSessionId) {
const statusResponse =
await multipartUploadApi.getMultipartUploadStatus(
uploadSessionId,
controller.signal,
);
if (statusResponse.status === "completed") {
const uploadedState = createResumeState(
context,
file,
uploadSessionId,
"uploaded",
);
saveResumeState(storageKey, uploadedState);
const completedUpload: CompletedMultipartUpload = {
upload_session_id: uploadSessionId,
bucket: statusResponse.bucket,
object_key: statusResponse.object_key,
size_bytes: file.size,
original_filename: file.name,
};
setState({
status: "uploaded",
error: null,
uploadSessionId,
fileName: file.name,
progress: getCompletedProgress(
file.size,
statusResponse.part_size_bytes,
),
resumeState: uploadedState,
});
return completedUpload;
}
const disallowedResumeStatus =
getResumeDisallowedStatus(statusResponse);
if (disallowedResumeStatus) {
clearResumeState(storageKey);
throw new ServerUploadSessionTerminalError(
disallowedResumeStatus,
getServerTerminalResumeMessage(disallowedResumeStatus),
);
}
partSizeBytes = statusResponse.part_size_bytes;
uploadedParts = statusResponse.uploaded_parts;
} else {
const initiateResponse =
await multipartUploadApi.initiateMultipartUpload(
{
...context,
original_filename: file.name,
content_type: file.type || "text/csv",
size_bytes: file.size,
},
controller.signal,
);
const newUploadSessionId = initiateResponse.upload_session_id;
uploadSessionId = newUploadSessionId;
partSizeBytes = initiateResponse.part_size_bytes;
const inProgressState = createResumeState(
context,
file,
newUploadSessionId,
"in_progress",
);
saveResumeState(storageKey, inProgressState);
setState((currentState) => ({
...currentState,
uploadSessionId: newUploadSessionId,
resumeState: inProgressState,
}));
}
const uploadedMultipartParts = await uploadMultipartParts({
file,
partSizeBytes,
signal: controller.signal,
alreadyUploadedParts: uploadedParts,
getPartUrls: async (partNumbers) => {
const response = await multipartUploadApi.getMultipartPartUrls(
uploadSessionId!,
partNumbers,
controller.signal,
);
return response.urls;
},
onProgress: (progress) => {
setState((currentState) => ({
...currentState,
status: "uploading",
uploadSessionId,
fileName: file.name,
progress,
}));
},
});
const completeResponse = await multipartUploadApi.completeMultipartUpload(
{
upload_session_id: uploadSessionId!,
parts: uploadedMultipartParts.map((part) => ({
part_number: part.part_number,
etag: part.etag,
})),
},
controller.signal,
);
const uploadedState = createResumeState(
context,
file,
uploadSessionId!,
"uploaded",
);
saveResumeState(storageKey, uploadedState);
const completedUpload: CompletedMultipartUpload = {
...completeResponse,
upload_session_id: uploadSessionId!,
original_filename: file.name,
};
setState({
status: "uploaded",
error: null,
uploadSessionId: uploadSessionId!,
fileName: file.name,
progress: getCompletedProgress(file.size, partSizeBytes),
resumeState: uploadedState,
});
return completedUpload;
} catch (error) {
if (error instanceof DOMException && error.name === "AbortError") {
setState((currentState) => ({
...currentState,
status: "aborted",
error: null,
}));
throw error;
}
if (error instanceof ServerUploadSessionTerminalError) {
setState({
status: error.recoveredStatus,
error: error.message,
uploadSessionId: null,
fileName: file.name,
progress: EMPTY_PROGRESS,
resumeState: null,
});
throw error;
}
setState((currentState) => ({
...currentState,
status: "failed",
error: getErrorMessage(error),
}));
throw error;
} finally {
activeControllerRef.current = null;
}
}
async function abortUpload(): Promise<void> {
const currentUploadSessionId =
state.uploadSessionId ?? state.resumeState?.upload_session_id;
activeControllerRef.current?.abort();
activeControllerRef.current = null;
if (
currentUploadSessionId &&
state.resumeState?.upload_phase !== "uploaded"
) {
try {
await multipartUploadApi.abortMultipartUpload(currentUploadSessionId);
} catch {
// Best effort abort; local resume state is still cleared to avoid trapping the UI.
}
}
clearResumeState(storageKey);
setState({
status: "aborted",
error: null,
uploadSessionId: null,
fileName: null,
progress: EMPTY_PROGRESS,
resumeState: null,
});
}
function clearUploadState(): void {
clearResumeState(storageKey);
setState(createInitialState(null));
}
return {
state,
startUpload,
abortUpload,
clearUploadState,
};
}
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