1 files changed, 0 insertions, 487 deletions
diff --git a/frontend-old/node_modules/@grpc/grpc-js/src/load-balancer-pick-first.ts b/frontend-old/node_modules/@grpc/grpc-js/src/load-balancer-pick-first.ts
deleted file mode 100644
index 75c9d4c..0000000
--- a/frontend-old/node_modules/@grpc/grpc-js/src/load-balancer-pick-first.ts
+++ /dev/null
@@ -1,487 +0,0 @@
-/*
- * Copyright 2019 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-import {
-  LoadBalancer,
-  ChannelControlHelper,
-  LoadBalancingConfig,
-  registerDefaultLoadBalancerType,
-  registerLoadBalancerType,
-} from './load-balancer';
-import { ConnectivityState } from './connectivity-state';
-import {
-  QueuePicker,
-  Picker,
-  PickArgs,
-  CompletePickResult,
-  PickResultType,
-  UnavailablePicker,
-} from './picker';
-import { SubchannelAddress } from './subchannel-address';
-import * as logging from './logging';
-import { LogVerbosity } from './constants';
-import {
-  SubchannelInterface,
-  ConnectivityStateListener,
-} from './subchannel-interface';
-
-const TRACER_NAME = 'pick_first';
-
-function trace(text: string): void {
-  logging.trace(LogVerbosity.DEBUG, TRACER_NAME, text);
-}
-
-const TYPE_NAME = 'pick_first';
-
-/**
- * Delay after starting a connection on a subchannel before starting a
- * connection on the next subchannel in the list, for Happy Eyeballs algorithm.
- */
-const CONNECTION_DELAY_INTERVAL_MS = 250;
-
-export class PickFirstLoadBalancingConfig implements LoadBalancingConfig {
-  constructor(private readonly shuffleAddressList: boolean) {}
-
-  getLoadBalancerName(): string {
-    return TYPE_NAME;
-  }
-
-  toJsonObject(): object {
-    return {
-      [TYPE_NAME]: {
-        shuffleAddressList: this.shuffleAddressList,
-      },
-    };
-  }
-
-  getShuffleAddressList() {
-    return this.shuffleAddressList;
-  }
-
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  static createFromJson(obj: any) {
-    if (
-      'shuffleAddressList' in obj &&
-      !(typeof obj.shuffleAddressList === 'boolean')
-    ) {
-      throw new Error(
-        'pick_first config field shuffleAddressList must be a boolean if provided'
-      );
-    }
-    return new PickFirstLoadBalancingConfig(obj.shuffleAddressList === true);
-  }
-}
-
-/**
- * Picker for a `PickFirstLoadBalancer` in the READY state. Always returns the
- * picked subchannel.
- */
-class PickFirstPicker implements Picker {
-  constructor(private subchannel: SubchannelInterface) {}
-
-  pick(pickArgs: PickArgs): CompletePickResult {
-    return {
-      pickResultType: PickResultType.COMPLETE,
-      subchannel: this.subchannel,
-      status: null,
-      onCallStarted: null,
-      onCallEnded: null,
-    };
-  }
-}
-
-interface SubchannelChild {
-  subchannel: SubchannelInterface;
-  hasReportedTransientFailure: boolean;
-}
-
-/**
- * Return a new array with the elements of the input array in a random order
- * @param list The input array
- * @returns A shuffled array of the elements of list
- */
-export function shuffled<T>(list: T[]): T[] {
-  const result = list.slice();
-  for (let i = result.length - 1; i > 1; i--) {
-    const j = Math.floor(Math.random() * (i + 1));
-    const temp = result[i];
-    result[i] = result[j];
-    result[j] = temp;
-  }
-  return result;
-}
-
-export class PickFirstLoadBalancer implements LoadBalancer {
-  /**
-   * The list of subchannels this load balancer is currently attempting to
-   * connect to.
-   */
-  private children: SubchannelChild[] = [];
-  /**
-   * The current connectivity state of the load balancer.
-   */
-  private currentState: ConnectivityState = ConnectivityState.IDLE;
-  /**
-   * The index within the `subchannels` array of the subchannel with the most
-   * recently started connection attempt.
-   */
-  private currentSubchannelIndex = 0;
-  /**
-   * The currently picked subchannel used for making calls. Populated if
-   * and only if the load balancer's current state is READY. In that case,
-   * the subchannel's current state is also READY.
-   */
-  private currentPick: SubchannelInterface | null = null;
-  /**
-   * Listener callback attached to each subchannel in the `subchannels` list
-   * while establishing a connection.
-   */
-  private subchannelStateListener: ConnectivityStateListener = (
-    subchannel,
-    previousState,
-    newState,
-    keepaliveTime,
-    errorMessage
-  ) => {
-    this.onSubchannelStateUpdate(subchannel, previousState, newState, errorMessage);
-  };
-  /**
-   * Timer reference for the timer tracking when to start
-   */
-  private connectionDelayTimeout: NodeJS.Timeout;
-
-  private triedAllSubchannels = false;
-
-  /**
-   * The LB policy enters sticky TRANSIENT_FAILURE mode when all
-   * subchannels have failed to connect at least once, and it stays in that
-   * mode until a connection attempt is successful. While in sticky TF mode,
-   * the LB policy continuously attempts to connect to all of its subchannels.
-   */
-  private stickyTransientFailureMode = false;
-
-  /**
-   * Indicates whether we called channelControlHelper.requestReresolution since
-   * the last call to updateAddressList
-   */
-  private requestedResolutionSinceLastUpdate = false;
-
-  /**
-   * The most recent error reported by any subchannel as it transitioned to
-   * TRANSIENT_FAILURE.
-   */
-  private lastError: string | null = null;
-
-  private latestAddressList: SubchannelAddress[] | null = null;
-
-  /**
-   * Load balancer that attempts to connect to each backend in the address list
-   * in order, and picks the first one that connects, using it for every
-   * request.
-   * @param channelControlHelper `ChannelControlHelper` instance provided by
-   *     this load balancer's owner.
-   */
-  constructor(private readonly channelControlHelper: ChannelControlHelper) {
-    this.connectionDelayTimeout = setTimeout(() => {}, 0);
-    clearTimeout(this.connectionDelayTimeout);
-  }
-
-  private allChildrenHaveReportedTF(): boolean {
-    return this.children.every(child => child.hasReportedTransientFailure);
-  }
-
-  private calculateAndReportNewState() {
-    if (this.currentPick) {
-      this.updateState(
-        ConnectivityState.READY,
-        new PickFirstPicker(this.currentPick)
-      );
-    } else if (this.children.length === 0) {
-      this.updateState(ConnectivityState.IDLE, new QueuePicker(this));
-    } else {
-      if (this.stickyTransientFailureMode) {
-        this.updateState(
-          ConnectivityState.TRANSIENT_FAILURE,
-          new UnavailablePicker({details: `No connection established. Last error: ${this.lastError}`})
-        );
-      } else {
-        this.updateState(ConnectivityState.CONNECTING, new QueuePicker(this));
-      }
-    }
-  }
-
-  private requestReresolution() {
-    this.requestedResolutionSinceLastUpdate = true;
-    this.channelControlHelper.requestReresolution();
-  }
-
-  private maybeEnterStickyTransientFailureMode() {
-    if (!this.allChildrenHaveReportedTF()) {
-      return;
-    }
-    if (!this.requestedResolutionSinceLastUpdate) {
-      /* Each time we get an update we reset each subchannel's
-       * hasReportedTransientFailure flag, so the next time we get to this
-       * point after that, each subchannel has reported TRANSIENT_FAILURE
-       * at least once since then. That is the trigger for requesting
-       * reresolution, whether or not the LB policy is already in sticky TF
-       * mode. */
-      this.requestReresolution();
-    }
-    if (this.stickyTransientFailureMode) {
-      return;
-    }
-    this.stickyTransientFailureMode = true;
-    for (const { subchannel } of this.children) {
-      subchannel.startConnecting();
-    }
-    this.calculateAndReportNewState();
-  }
-
-  private removeCurrentPick() {
-    if (this.currentPick !== null) {
-      /* Unref can cause a state change, which can cause a change in the value
-       * of this.currentPick, so we hold a local reference to make sure that
-       * does not impact this function. */
-      const currentPick = this.currentPick;
-      this.currentPick = null;
-      currentPick.unref();
-      currentPick.removeConnectivityStateListener(this.subchannelStateListener);
-      this.channelControlHelper.removeChannelzChild(
-        currentPick.getChannelzRef()
-      );
-    }
-  }
-
-  private onSubchannelStateUpdate(
-    subchannel: SubchannelInterface,
-    previousState: ConnectivityState,
-    newState: ConnectivityState,
-    errorMessage?: string
-  ) {
-    if (this.currentPick?.realSubchannelEquals(subchannel)) {
-      if (newState !== ConnectivityState.READY) {
-        this.removeCurrentPick();
-        this.calculateAndReportNewState();
-        this.requestReresolution();
-      }
-      return;
-    }
-    for (const [index, child] of this.children.entries()) {
-      if (subchannel.realSubchannelEquals(child.subchannel)) {
-        if (newState === ConnectivityState.READY) {
-          this.pickSubchannel(child.subchannel);
-        }
-        if (newState === ConnectivityState.TRANSIENT_FAILURE) {
-          child.hasReportedTransientFailure = true;
-          if (errorMessage) {
-            this.lastError = errorMessage;
-          }
-          this.maybeEnterStickyTransientFailureMode();
-          if (index === this.currentSubchannelIndex) {
-            this.startNextSubchannelConnecting(index + 1);
-          }
-        }
-        child.subchannel.startConnecting();
-        return;
-      }
-    }
-  }
-
-  private startNextSubchannelConnecting(startIndex: number) {
-    clearTimeout(this.connectionDelayTimeout);
-    if (this.triedAllSubchannels) {
-      return;
-    }
-    for (const [index, child] of this.children.entries()) {
-      if (index >= startIndex) {
-        const subchannelState = child.subchannel.getConnectivityState();
-        if (
-          subchannelState === ConnectivityState.IDLE ||
-          subchannelState === ConnectivityState.CONNECTING
-        ) {
-          this.startConnecting(index);
-          return;
-        }
-      }
-    }
-    this.triedAllSubchannels = true;
-    this.maybeEnterStickyTransientFailureMode();
-  }
-
-  /**
-   * Have a single subchannel in the `subchannels` list start connecting.
-   * @param subchannelIndex The index into the `subchannels` list.
-   */
-  private startConnecting(subchannelIndex: number) {
-    clearTimeout(this.connectionDelayTimeout);
-    this.currentSubchannelIndex = subchannelIndex;
-    if (
-      this.children[subchannelIndex].subchannel.getConnectivityState() ===
-      ConnectivityState.IDLE
-    ) {
-      trace(
-        'Start connecting to subchannel with address ' +
-          this.children[subchannelIndex].subchannel.getAddress()
-      );
-      process.nextTick(() => {
-        this.children[subchannelIndex]?.subchannel.startConnecting();
-      });
-    }
-    this.connectionDelayTimeout = setTimeout(() => {
-      this.startNextSubchannelConnecting(subchannelIndex + 1);
-    }, CONNECTION_DELAY_INTERVAL_MS).unref?.();
-  }
-
-  private pickSubchannel(subchannel: SubchannelInterface) {
-    if (this.currentPick && subchannel.realSubchannelEquals(this.currentPick)) {
-      return;
-    }
-    trace('Pick subchannel with address ' + subchannel.getAddress());
-    this.stickyTransientFailureMode = false;
-    if (this.currentPick !== null) {
-      this.currentPick.unref();
-      this.channelControlHelper.removeChannelzChild(
-        this.currentPick.getChannelzRef()
-      );
-      this.currentPick.removeConnectivityStateListener(
-        this.subchannelStateListener
-      );
-    }
-    this.currentPick = subchannel;
-    subchannel.ref();
-    this.channelControlHelper.addChannelzChild(subchannel.getChannelzRef());
-    this.resetSubchannelList();
-    clearTimeout(this.connectionDelayTimeout);
-    this.calculateAndReportNewState();
-  }
-
-  private updateState(newState: ConnectivityState, picker: Picker) {
-    trace(
-      ConnectivityState[this.currentState] +
-        ' -> ' +
-        ConnectivityState[newState]
-    );
-    this.currentState = newState;
-    this.channelControlHelper.updateState(newState, picker);
-  }
-
-  private resetSubchannelList() {
-    for (const child of this.children) {
-      if (!(this.currentPick && child.subchannel.realSubchannelEquals(this.currentPick))) {
-        /* The connectivity state listener is the same whether the subchannel
-         * is in the list of children or it is the currentPick, so if it is in
-         * both, removing it here would cause problems. In particular, that
-         * always happens immediately after the subchannel is picked. */
-        child.subchannel.removeConnectivityStateListener(
-          this.subchannelStateListener
-        );
-      }
-      /* Refs are counted independently for the children list and the
-       * currentPick, so we call unref whether or not the child is the
-       * currentPick. Channelz child references are also refcounted, so
-       * removeChannelzChild can be handled the same way. */
-      child.subchannel.unref();
-      this.channelControlHelper.removeChannelzChild(
-        child.subchannel.getChannelzRef()
-      );
-    }
-    this.currentSubchannelIndex = 0;
-    this.children = [];
-    this.triedAllSubchannels = false;
-    this.requestedResolutionSinceLastUpdate = false;
-  }
-
-  private connectToAddressList(addressList: SubchannelAddress[]) {
-    const newChildrenList = addressList.map(address => ({
-      subchannel: this.channelControlHelper.createSubchannel(address, {}),
-      hasReportedTransientFailure: false,
-    }));
-    /* Ref each subchannel before resetting the list, to ensure that
-     * subchannels shared between the list don't drop to 0 refs during the
-     * transition. */
-    for (const { subchannel } of newChildrenList) {
-      subchannel.ref();
-      this.channelControlHelper.addChannelzChild(subchannel.getChannelzRef());
-    }
-    this.resetSubchannelList();
-    this.children = newChildrenList;
-    for (const { subchannel } of this.children) {
-      subchannel.addConnectivityStateListener(this.subchannelStateListener);
-      if (subchannel.getConnectivityState() === ConnectivityState.READY) {
-        this.pickSubchannel(subchannel);
-        return;
-      }
-    }
-    for (const child of this.children) {
-      if (
-        child.subchannel.getConnectivityState() ===
-        ConnectivityState.TRANSIENT_FAILURE
-      ) {
-        child.hasReportedTransientFailure = true;
-      }
-    }
-    this.startNextSubchannelConnecting(0);
-    this.calculateAndReportNewState();
-  }
-
-  updateAddressList(
-    addressList: SubchannelAddress[],
-    lbConfig: LoadBalancingConfig
-  ): void {
-    if (!(lbConfig instanceof PickFirstLoadBalancingConfig)) {
-      return;
-    }
-    /* Previously, an update would be discarded if it was identical to the
-     * previous update, to minimize churn. Now the DNS resolver is
-     * rate-limited, so that is less of a concern. */
-    if (lbConfig.getShuffleAddressList()) {
-      addressList = shuffled(addressList);
-    }
-    this.latestAddressList = addressList;
-    this.connectToAddressList(addressList);
-  }
-
-  exitIdle() {
-    if (this.currentState === ConnectivityState.IDLE && this.latestAddressList) {
-      this.connectToAddressList(this.latestAddressList);
-    }
-  }
-
-  resetBackoff() {
-    /* The pick first load balancer does not have a connection backoff, so this
-     * does nothing */
-  }
-
-  destroy() {
-    this.resetSubchannelList();
-    this.removeCurrentPick();
-  }
-
-  getTypeName(): string {
-    return TYPE_NAME;
-  }
-}
-
-export function setup(): void {
-  registerLoadBalancerType(
-    TYPE_NAME,
-    PickFirstLoadBalancer,
-    PickFirstLoadBalancingConfig
-  );
-  registerDefaultLoadBalancerType(TYPE_NAME);
-}