@pnp/sp/batching.js

import { getGUID, isUrlAbsolute, combine, CopyFrom, isFunc, hOP } from "@pnp/core";
import { InjectHeaders, parseBinderWithErrorCheck } from "@pnp/queryable";
import { spPost } from "./operations.js";
import { _SPQueryable } from "./spqueryable.js";
import { spfi, SPFI } from "./fi.js";
import { Web, _Web } from "./webs/types.js";
SPFI.prototype.batched = function (props) {
    const batched = spfi(this);
    const [behavior, execute] = createBatch(batched._root, props);
    batched.using(behavior);
    return [batched, execute];
};
_Web.prototype.batched = function (props) {
    const batched = Web(this);
    const [behavior, execute] = createBatch(batched, props);
    batched.using(behavior);
    return [batched, execute];
};
/**
 * Tracks on a batched instance that registration is complete (the child request has gotten to the send moment and the request is included in the batch)
 */
const RegistrationCompleteSym = Symbol.for("batch_registration");
/**
 * Tracks on a batched instance that the child request timeline lifecycle is complete (called in child.dispose)
 */
const RequestCompleteSym = Symbol.for("batch_request");
/**
 * Special batch parsing behavior used to convert the batch response text into a set of Response objects for each request
 * @returns A parser behavior
 */
function BatchParse() {
    return parseBinderWithErrorCheck(async (response) => {
        const text = await response.text();
        return parseResponse(text);
    });
}
/**
 * Internal class used to execute the batch request through the timeline lifecycle
 */
class BatchQueryable extends _SPQueryable {
    constructor(base, requestBaseUrl = base.toUrl().replace(/_api[\\|/].*$/i, "")) {
        super(requestBaseUrl, "_api/$batch");
        this.requestBaseUrl = requestBaseUrl;
        // this will copy over the current observables from the base associated with this batch
        // this will replace any other parsing present
        this.using(CopyFrom(base, "replace"), BatchParse());
        this.on.dispose(() => {
            // there is a code path where you may invoke a batch, say on items.add, whose return
            // is an object like { data: any, item: IItem }. The expectation from v1 on is `item` in that object
            // is immediately usable to make additional queries. Without this step when that IItem instance is
            // created using "this.getById" within IITems.add all of the current observers of "this" are
            // linked to the IItem instance created (expected), BUT they will be the set of observers setup
            // to handle the batch, meaning invoking `item` will result in a half batched call that
            // doesn't really work. To deliver the expected functionality we "reset" the
            // observers using the original instance, mimicing the behavior had
            // the IItem been created from that base without a batch involved. We use CopyFrom to ensure
            // that we maintain the references to the InternalResolve and InternalReject events through
            // the end of this timeline lifecycle. This works because CopyFrom by design uses Object.keys
            // which ignores symbol properties.
            base.using(CopyFrom(this, "replace", (k) => /(auth|send|pre|init)/i.test(k)));
        });
    }
}
/**
 * Creates a batched version of the supplied base, meaning that all chained fluent operations from the new base are part of the batch
 *
 * @param base The base from which to initialize the batch
 * @param props Any properties used to initialize the batch functionality
 * @returns A tuple of [behavior used to assign objects to the batch, the execute function used to resolve the batch requests]
 */
export function createBatch(base, props) {
    const registrationPromises = [];
    const completePromises = [];
    const requests = [];
    const batchId = getGUID();
    const batchQuery = new BatchQueryable(base);
    const { headersCopyPattern } = {
        headersCopyPattern: /Accept|Content-Type|IF-Match/i,
        ...props,
    };
    const execute = async () => {
        await Promise.all(registrationPromises);
        if (requests.length < 1) {
            // even if we have no requests we need to await the complete promises to ensure
            // that execute only resolves AFTER every child request disposes #2457
            // this likely means caching is being used, we returned values for all child requests from the cache
            return Promise.all(completePromises).then(() => void (0));
        }
        const batchBody = [];
        let currentChangeSetId = "";
        for (let i = 0; i < requests.length; i++) {
            const [, url, init] = requests[i];
            if (init.method === "GET") {
                if (currentChangeSetId.length > 0) {
                    // end an existing change set
                    batchBody.push(`--changeset_${currentChangeSetId}--\n\n`);
                    currentChangeSetId = "";
                }
                batchBody.push(`--batch_${batchId}\n`);
            }
            else {
                if (currentChangeSetId.length < 1) {
                    // start new change set
                    currentChangeSetId = getGUID();
                    batchBody.push(`--batch_${batchId}\n`);
                    batchBody.push(`Content-Type: multipart/mixed; boundary="changeset_${currentChangeSetId}"\n\n`);
                }
                batchBody.push(`--changeset_${currentChangeSetId}\n`);
            }
            // common batch part prefix
            batchBody.push("Content-Type: application/http\n");
            batchBody.push("Content-Transfer-Encoding: binary\n\n");
            // these are the per-request headers
            const headers = new Headers(init.headers);
            // this is the url of the individual request within the batch
            const reqUrl = isUrlAbsolute(url) ? url : combine(batchQuery.requestBaseUrl, url);
            if (init.method !== "GET") {
                let method = init.method;
                if (headers.has("X-HTTP-Method")) {
                    method = headers.get("X-HTTP-Method");
                    headers.delete("X-HTTP-Method");
                }
                batchBody.push(`${method} ${reqUrl} HTTP/1.1\n`);
            }
            else {
                batchBody.push(`${init.method} ${reqUrl} HTTP/1.1\n`);
            }
            // lastly we apply any default headers we need that may not exist
            if (!headers.has("Accept")) {
                headers.append("Accept", "application/json");
            }
            if (!headers.has("Content-Type")) {
                headers.append("Content-Type", "application/json;charset=utf-8");
            }
            // write headers into batch body
            headers.forEach((value, name) => {
                if (headersCopyPattern.test(name)) {
                    batchBody.push(`${name}: ${value}\n`);
                }
            });
            batchBody.push("\n");
            if (init.body) {
                batchBody.push(`${init.body}\n\n`);
            }
        }
        if (currentChangeSetId.length > 0) {
            // Close the changeset
            batchBody.push(`--changeset_${currentChangeSetId}--\n\n`);
            currentChangeSetId = "";
        }
        batchBody.push(`--batch_${batchId}--\n`);
        // we need to set our own headers here
        batchQuery.using(InjectHeaders({
            "Content-Type": `multipart/mixed; boundary=batch_${batchId}`,
        }));
        const responses = await spPost(batchQuery, { body: batchBody.join("") });
        if (responses.length !== requests.length) {
            throw Error("Could not properly parse responses to match requests in batch.");
        }
        return new Promise((res, rej) => {
            try {
                for (let index = 0; index < responses.length; index++) {
                    const [, , , resolve, reject] = requests[index];
                    try {
                        resolve(responses[index]);
                    }
                    catch (e) {
                        reject(e);
                    }
                }
                // this small delay allows the promises to resolve correctly in order by dropping this resolve behind
                // the other work in the event loop. Feels hacky, but it works so 🤷
                setTimeout(res, 0);
            }
            catch (e) {
                setTimeout(() => rej(e), 0);
            }
        }).then(() => Promise.all(completePromises)).then(() => void (0));
    };
    const register = (instance) => {
        instance.on.init(function () {
            if (isFunc(this[RegistrationCompleteSym])) {
                throw Error("This instance is already part of a batch. Please review the docs at https://pnp.github.io/pnpjs/concepts/batching#reuse.");
            }
            // we need to ensure we wait to start execute until all our batch children hit the .send method to be fully registered
            registrationPromises.push(new Promise((resolve) => {
                this[RegistrationCompleteSym] = resolve;
            }));
            return this;
        });
        instance.on.pre(async function (url, init, result) {
            // Do not add to timeline if using BatchNever behavior
            if (hOP(init.headers, "X-PnP-BatchNever")) {
                // clean up the init operations from the timeline
                // not strictly necessary as none of the logic that uses this should be in the request, but good to keep things tidy
                if (typeof (this[RequestCompleteSym]) === "function") {
                    this[RequestCompleteSym]();
                    delete this[RequestCompleteSym];
                }
                this.using(CopyFrom(batchQuery, "replace", (k) => /(init|pre)/i.test(k)));
                return [url, init, result];
            }
            // the entire request will be auth'd - we don't need to run this for each batch request
            this.on.auth.clear();
            // we replace the send function with our batching logic
            this.on.send.replace(async function (url, init) {
                // this is the promise that Queryable will see returned from .emit.send
                const promise = new Promise((resolve, reject) => {
                    // add the request information into the batch
                    requests.push([this, url.toString(), init, resolve, reject]);
                });
                this.log(`[batch:${batchId}] (${(new Date()).getTime()}) Adding request ${init.method} ${url.toString()} to batch.`, 0);
                // we need to ensure we wait to resolve execute until all our batch children have fully completed their request timelines
                completePromises.push(new Promise((resolve) => {
                    this[RequestCompleteSym] = resolve;
                }));
                // indicate that registration of this request is complete
                this[RegistrationCompleteSym]();
                return promise;
            });
            this.on.dispose(function () {
                if (isFunc(this[RegistrationCompleteSym])) {
                    // if this request is in a batch and caching is in play we need to resolve the registration promises to unblock processing of the batch
                    // because the request will never reach the "send" moment as the result is returned from "pre"
                    this[RegistrationCompleteSym]();
                    // remove the symbol props we added for good hygene
                    delete this[RegistrationCompleteSym];
                }
                if (isFunc(this[RequestCompleteSym])) {
                    // let things know we are done with this request
                    this[RequestCompleteSym]();
                    delete this[RequestCompleteSym];
                    // there is a code path where you may invoke a batch, say on items.add, whose return
                    // is an object like { data: any, item: IItem }. The expectation from v1 on is `item` in that object
                    // is immediately usable to make additional queries. Without this step when that IItem instance is
                    // created using "this.getById" within IITems.add all of the current observers of "this" are
                    // linked to the IItem instance created (expected), BUT they will be the set of observers setup
                    // to handle the batch, meaning invoking `item` will result in a half batched call that
                    // doesn't really work. To deliver the expected functionality we "reset" the
                    // observers using the original instance, mimicing the behavior had
                    // the IItem been created from that base without a batch involved. We use CopyFrom to ensure
                    // that we maintain the references to the InternalResolve and InternalReject events through
                    // the end of this timeline lifecycle. This works because CopyFrom by design uses Object.keys
                    // which ignores symbol properties.
                    this.using(CopyFrom(batchQuery, "replace", (k) => /(auth|pre|send|init|dispose)/i.test(k)));
                }
            });
            return [url, init, result];
        });
        return instance;
    };
    return [register, execute];
}
/**
 * Behavior that blocks batching for the request regardless of "method"
 *
 * This is used for requests to bypass batching methods. Example - Request Digest where we need to get a request-digest inside of a batch.
 * @returns TimelinePipe
 */
export function BatchNever() {
    return (instance) => {
        instance.on.pre.prepend(async function (url, init, result) {
            init.headers = { ...init.headers, "X-PnP-BatchNever": "1" };
            return [url, init, result];
        });
        return instance;
    };
}
/**
 * Parses the text body returned by the server from a batch request
 *
 * @param body String body from the server response
 * @returns Parsed response objects
 */
function parseResponse(body) {
    const responses = [];
    const header = "--batchresponse_";
    // Ex. "HTTP/1.1 500 Internal Server Error"
    const statusRegExp = new RegExp("^HTTP/[0-9.]+ +([0-9]+) +(.*)", "i");
    const lines = body.split("\n");
    let state = "batch";
    let status;
    let statusText;
    let headers = {};
    const bodyReader = [];
    for (let i = 0; i < lines.length; ++i) {
        let line = lines[i];
        switch (state) {
            case "batch":
                if (line.substring(0, header.length) === header) {
                    state = "batchHeaders";
                }
                else {
                    if (line.trim() !== "") {
                        throw Error(`Invalid response, line ${i}`);
                    }
                }
                break;
            case "batchHeaders":
                if (line.trim() === "") {
                    state = "status";
                }
                break;
            case "status": {
                const parts = statusRegExp.exec(line);
                if (parts.length !== 3) {
                    throw Error(`Invalid status, line ${i}`);
                }
                status = parseInt(parts[1], 10);
                statusText = parts[2];
                state = "statusHeaders";
                break;
            }
            case "statusHeaders":
                if (line.trim() === "") {
                    state = "body";
                }
                else {
                    const headerParts = line.split(":");
                    if ((headerParts === null || headerParts === void 0 ? void 0 : headerParts.length) === 2) {
                        headers[headerParts[0].trim()] = headerParts[1].trim();
                    }
                }
                break;
            case "body":
                // reset the body reader
                bodyReader.length = 0;
                // this allows us to capture batch bodies that are returned as multi-line (renderListDataAsStream, #2454)
                while (line.substring(0, header.length) !== header) {
                    bodyReader.push(line);
                    line = lines[++i];
                }
                // because we have read the closing --batchresponse_ line, we need to move the line pointer back one
                // so that the logic works as expected either to get the next result or end processing
                i--;
                responses.push(new Response(status === 204 ? null : bodyReader.join(""), { status, statusText, headers }));
                state = "batch";
                headers = {};
                break;
        }
    }
    if (state !== "status") {
        throw Error("Unexpected end of input");
    }
    return responses;
}
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