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execute.ts
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execute.ts
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import {
Channels,
childOf,
createExecuteRequest,
ExecuteRequest,
executionCounts,
inputReply,
inputRequests,
JupyterMessage,
kernelStatuses,
MessageType,
ofMessageType,
outputs,
payloads
} from "@nteract/messaging";
import { ofType } from "redux-observable";
import { ActionsObservable, StateObservable } from "redux-observable";
import { empty, merge, Observable, Observer, of, throwError } from "rxjs";
import {
catchError,
concatMap,
filter,
groupBy,
map,
mapTo,
mergeAll,
mergeMap,
share,
switchMap,
takeUntil,
tap
} from "rxjs/operators";
import * as actions from "@nteract/actions";
import { CellId, OnDiskOutput } from "@nteract/commutable";
import * as selectors from "@nteract/selectors";
import {
AppState,
ContentRef,
InputRequestMessage,
PayloadMessage
} from "@nteract/types";
const Immutable = require("immutable");
/**
* Observe all the reactions to running code for cell with id.
*
* @param {Subject} channels - The standard channels specified in the Jupyter
* specification.
* @param {String} id - Universally Unique Identifier of cell to be executed.
* @param {String} code - Source code to be executed.
* @return {Observable<Action>} updatedOutputs - It returns an observable with
* a stream of events that need to happen after a cell has been executed.
*/
export function executeCellStream(
channels: Channels,
id: string,
message: ExecuteRequest,
contentRef: ContentRef
) {
if (!channels || !channels.pipe) {
return throwError(new Error("kernel not connected"));
}
const executeRequest = message;
// All the streams intended for all frontends
const cellMessages: Observable<JupyterMessage<
MessageType,
any
>> = channels.pipe(childOf(executeRequest), share());
// All the payload streams, intended for one user
const payloadStream = cellMessages.pipe(payloads());
const cellAction$ = merge(
payloadStream.pipe(
map((payload: PayloadMessage) =>
actions.acceptPayloadMessage({ id, payload, contentRef })
)
),
// All actions for updating cell status
cellMessages.pipe(
kernelStatuses() as any,
map((status: string) =>
actions.updateCellStatus({ id, status, contentRef })
)
),
// Update the input numbering: `[ ]`
cellMessages.pipe(
executionCounts() as any,
map((ct: number) =>
actions.updateCellExecutionCount({ id, value: ct, contentRef })
)
),
// All actions for new outputs
cellMessages.pipe(
outputs() as any,
map((output: OnDiskOutput) =>
actions.appendOutput({ id, output, contentRef })
)
),
// clear_output display message
cellMessages.pipe(
ofMessageType("clear_output") as any,
mapTo(actions.clearOutputs({ id, contentRef }))
),
// Prompt the user for input
cellMessages.pipe(
inputRequests() as any,
map((inputRequest: InputRequestMessage) => {
return actions.promptInputRequest({
id,
contentRef,
prompt: inputRequest.prompt,
password: inputRequest.password
});
})
)
);
// On subscription, send the message
return Observable.create((observer: Observer<any>) => {
const subscription = cellAction$.subscribe(observer);
channels.next(executeRequest);
return subscription;
});
}
export function createExecuteCellStream(
action$: ActionsObservable<
| actions.ExecuteCanceled
| actions.DeleteCell
| actions.LaunchKernelAction
| actions.LaunchKernelByNameAction
| actions.KillKernelAction
| actions.ExecuteCell
| actions.ExecuteFocusedCell
>,
state: any,
message: ExecuteRequest,
id: string,
contentRef: ContentRef
): Observable<any> {
const kernel = selectors.kernelByContentRef(state, {
contentRef: contentRef
});
const channels = kernel ? kernel.channels : null;
const kernelConnected =
kernel &&
channels &&
!(kernel.status === "starting" || kernel.status === "not connected");
if (!kernelConnected || !channels) {
return of(
actions.executeFailed({
error: new Error("Kernel not connected!"),
contentRef
})
);
}
const cellStream = executeCellStream(channels, id, message, contentRef).pipe(
takeUntil(
merge(
action$.pipe(
ofType(actions.EXECUTE_CANCELED, actions.DELETE_CELL),
filter(
(
action:
| actions.ExecuteCanceled
| actions.DeleteCell
| actions.LaunchKernelAction
| actions.LaunchKernelByNameAction
| actions.KillKernelAction
| actions.ExecuteCell
| actions.ExecuteFocusedCell
) => (action as actions.ExecuteCanceled).payload.id === id
)
),
action$.pipe(
ofType(
actions.LAUNCH_KERNEL,
actions.LAUNCH_KERNEL_BY_NAME,
actions.KILL_KERNEL
),
filter(
(
action:
| actions.ExecuteCanceled
| actions.DeleteCell
| actions.LaunchKernelAction
| actions.LaunchKernelByNameAction
| actions.KillKernelAction
| actions.ExecuteCell
| actions.ExecuteFocusedCell
) => action.payload.contentRef === contentRef
)
)
)
)
);
return merge(
// We make sure to propagate back to "ourselves" the actual message
// that we sent to the kernel with the sendExecuteRequest action
of(actions.sendExecuteRequest({ id, message, contentRef })),
// Merging it in with the actual stream
cellStream
);
}
export function executeAllCellsEpic(
action$: ActionsObservable<
actions.ExecuteAllCells | actions.ExecuteAllCellsBelow
>,
state$: StateObservable<AppState>
) {
return action$.pipe(
ofType(actions.EXECUTE_ALL_CELLS, actions.EXECUTE_ALL_CELLS_BELOW),
concatMap(
(action: actions.ExecuteAllCells | actions.ExecuteAllCellsBelow) => {
const state = state$.value;
const contentRef = action.payload.contentRef;
const model = selectors.model(state, { contentRef });
// If it's not a notebook, we shouldn't be here
if (!model || model.type !== "notebook") {
return empty();
}
let codeCellIds = Immutable.List();
if (action.type === actions.EXECUTE_ALL_CELLS) {
codeCellIds = selectors.notebook.codeCellIds(model);
} else if (action.type === actions.EXECUTE_ALL_CELLS_BELOW) {
codeCellIds = selectors.notebook.codeCellIdsBelow(model);
}
return of(
...codeCellIds.map((id: CellId) =>
actions.executeCell({ id, contentRef: action.payload.contentRef })
)
);
}
)
);
}
/**
* the execute cell epic processes execute requests for all cells, creating
* inner observable streams of the running execution responses
*/
export function executeCellEpic(
action$: ActionsObservable<actions.ExecuteCell | actions.ExecuteFocusedCell>,
state$: any
) {
return action$.pipe(
ofType(actions.EXECUTE_CELL, actions.EXECUTE_FOCUSED_CELL),
mergeMap((action: actions.ExecuteCell | actions.ExecuteFocusedCell) => {
if (action.type === actions.EXECUTE_FOCUSED_CELL) {
const contentRef = action.payload.contentRef;
const state = state$.value;
const model = selectors.model(state, { contentRef });
// If it's not a notebook, we shouldn't be here
if (!model || model.type !== "notebook") {
return empty();
}
const id = model.cellFocused;
if (!id) {
throw new Error("attempted to execute without an id");
}
return of(
actions.executeCell({ id, contentRef: action.payload.contentRef })
);
}
return of(action);
}),
tap((action: actions.ExecuteCell) => {
if (!action.payload.id) {
throw new Error("execute cell needs an id");
}
}),
// Split stream by cell IDs
groupBy((action: actions.ExecuteCell) => action.payload.id),
// Work on each cell's stream
map(cellAction$ =>
cellAction$.pipe(
// When a new EXECUTE_CELL comes in with the current ID, we create a
// a new stream and unsubscribe from the old one.
switchMap((action: actions.ExecuteCell) => {
const { id } = action.payload;
const state = state$.value;
const contentRef = action.payload.contentRef;
const model = selectors.model(state, { contentRef });
// If it's not a notebook, we shouldn't be here
if (!model || model.type !== "notebook") {
return empty();
}
const cell = selectors.notebook.cellById(model, {
id
});
if (!cell) {
return empty();
}
// We only execute code cells
if ((cell as any).get("cell_type") === "code") {
const source = cell.get("source", "");
const message = createExecuteRequest(source);
return createExecuteCellStream(
action$,
state,
message,
id,
action.payload.contentRef
).pipe(
catchError((error, source) =>
merge(
of(
actions.executeFailed({
error,
contentRef: action.payload.contentRef
})
),
source
)
)
);
}
return empty();
})
)
),
// Bring back all the inner Observables into one stream
mergeAll(),
catchError((error: Error, source) => {
// Either we ensure that all errors are caught when the action.payload.contentRef
// is in scope or we make this be a generic ERROR
return merge(
of(
actions.executeFailed({
error
})
),
source
);
})
);
}
export const updateDisplayEpic = (
action$: ActionsObservable<
actions.NewKernelAction | actions.KillKernelSuccessful
>
) =>
// Global message watcher so we need to set up a feed for each new kernel
action$.pipe(
ofType(actions.LAUNCH_KERNEL_SUCCESSFUL),
switchMap(
(action: actions.NewKernelAction | actions.KillKernelSuccessful) =>
(action as actions.NewKernelAction).payload.kernel.channels.pipe(
ofMessageType("update_display_data"),
map((msg: JupyterMessage) =>
actions.updateDisplay({
content: msg.content,
contentRef: (action as actions.NewKernelAction).payload.contentRef
})
),
takeUntil(
action$.pipe(
ofType(actions.KILL_KERNEL_SUCCESSFUL),
filter(
(
killAction:
| actions.KillKernelSuccessful
| actions.NewKernelAction
) => killAction.payload.kernelRef === action.payload.kernelRef
)
)
),
catchError(error =>
of(
actions.updateDisplayFailed({
error,
contentRef: (action as actions.NewKernelAction).payload
.contentRef
})
)
)
)
)
);
export const sendInputReplyEpic = (
action$: ActionsObservable<actions.SendInputReply>,
state$: StateObservable<AppState>
) =>
action$.pipe(
ofType(actions.SEND_INPUT_REPLY),
switchMap((action: actions.SendInputReply) => {
const state = state$.value;
const kernel = selectors.kernelByContentRef(state, {
contentRef: action.payload.contentRef
});
if (kernel) {
const reply = inputReply({ value: action.payload.value });
kernel.channels.next(reply);
}
return empty();
})
);