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/var/www/greso.tech/server/nsm/node_modules/@grpc/grpc-js/src/

/var/www/greso.tech/server/nsm/node_modules/@grpc/grpc-js/src

Name	Size	Mode	Actions
generated/	-	0755	rm
admin.ts	1345	0644	edit dl rm
backoff-timeout.ts	4719	0644	edit dl rm
call-credentials.ts	6555	0644	edit dl rm
call-interface.ts	4982	0644	edit dl rm
call-number.ts	694	0644	edit dl rm
call.ts	5447	0644	edit dl rm
channel-credentials.ts	8753	0644	edit dl rm
channel-options.ts	4100	0644	edit dl rm
channel.ts	5547	0644	edit dl rm
channelz.ts	26226	0644	edit dl rm
client-interceptors.ts	17901	0644	edit dl rm
client.ts	24828	0644	edit dl rm
compression-algorithms.ts	682	0644	edit dl rm
compression-filter.ts	10167	0644	edit dl rm
connectivity-state.ts	699	0644	edit dl rm
constants.ts	1651	0644	edit dl rm
control-plane-status.ts	1222	0644	edit dl rm
deadline.ts	2935	0644	edit dl rm
duration.ts	1096	0644	edit dl rm
error.ts	1062	0644	edit dl rm
events.ts	1108	0644	edit dl rm
experimental.ts	1352	0644	edit dl rm
filter-stack.ts	2674	0644	edit dl rm
filter.ts	1887	0644	edit dl rm
http_proxy.ts	8827	0644	edit dl rm
index.ts	7918	0644	edit dl rm
internal-channel.ts	21831	0644	edit dl rm
load-balancer-child-handler.ts	4868	0644	edit dl rm
load-balancer-outlier-detection.ts	25014	0644	edit dl rm
load-balancer-pick-first.ts	16073	0644	edit dl rm
load-balancer-round-robin.ts	7573	0644	edit dl rm
load-balancer.ts	7483	0644	edit dl rm
load-balancing-call.ts	10585	0644	edit dl rm
logging.ts	3407	0644	edit dl rm
make-client.ts	7201	0644	edit dl rm
max-message-size-filter.ts	3049	0644	edit dl rm
metadata.ts	8988	0644	edit dl rm
object-stream.ts	2214	0644	edit dl rm
picker.ts	4328	0644	edit dl rm
resolver-dns.ts	13169	0644	edit dl rm
resolver-ip.ts	3559	0644	edit dl rm
resolver-uds.ts	1611	0644	edit dl rm
resolver.ts	5805	0644	edit dl rm
resolving-call.ts	9856	0644	edit dl rm
resolving-load-balancer.ts	11508	0644	edit dl rm
retrying-call.ts	23079	0644	edit dl rm
server-call.ts	27256	0644	edit dl rm
server-credentials.ts	2822	0644	edit dl rm
server.ts	37334	0644	edit dl rm
service-config.ts	15852	0644	edit dl rm
status-builder.ts	1783	0644	edit dl rm
stream-decoder.ts	3501	0644	edit dl rm
subchannel-address.ts	2307	0644	edit dl rm
subchannel-call.ts	18197	0644	edit dl rm
subchannel-interface.ts	2831	0644	edit dl rm
subchannel-pool.ts	5490	0644	edit dl rm
subchannel.ts	13755	0644	edit dl rm
tls-helpers.ts	1088	0644	edit dl rm
transport.ts	25264	0644	edit dl rm
uri-parser.ts	2814	0644	edit dl rm

Edit: /var/www/greso.tech/server/nsm/node_modules/@grpc/grpc-js/src/resolving-load-balancer.ts (11508B)

/*
 * 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 {
  ChannelControlHelper,
  LoadBalancer,
  LoadBalancingConfig,
  getFirstUsableConfig,
} from './load-balancer';
import { ServiceConfig, validateServiceConfig } from './service-config';
import { ConnectivityState } from './connectivity-state';
import { ConfigSelector, createResolver, Resolver } from './resolver';
import { ServiceError } from './call';
import { Picker, UnavailablePicker, QueuePicker } from './picker';
import { BackoffOptions, BackoffTimeout } from './backoff-timeout';
import { Status } from './constants';
import { StatusObject } from './call-interface';
import { Metadata } from './metadata';
import * as logging from './logging';
import { LogVerbosity } from './constants';
import { SubchannelAddress } from './subchannel-address';
import { GrpcUri, uriToString } from './uri-parser';
import { ChildLoadBalancerHandler } from './load-balancer-child-handler';
import { ChannelOptions } from './channel-options';
import { PickFirstLoadBalancingConfig } from './load-balancer-pick-first';

const TRACER_NAME = 'resolving_load_balancer';

function trace(text: string): void {
  logging.trace(LogVerbosity.DEBUG, TRACER_NAME, text);
}

const DEFAULT_LOAD_BALANCER_NAME = 'pick_first';

export interface ResolutionCallback {
  (serviceConfig: ServiceConfig, configSelector: ConfigSelector): void;
}

export interface ResolutionFailureCallback {
  (status: StatusObject): void;
}

export class ResolvingLoadBalancer implements LoadBalancer {
  /**
   * The resolver class constructed for the target address.
   */
  private innerResolver: Resolver;

private childLoadBalancer: ChildLoadBalancerHandler;
  private latestChildState: ConnectivityState = ConnectivityState.IDLE;
  private latestChildPicker: Picker = new QueuePicker(this);
  /**
   * This resolving load balancer's current connectivity state.
   */
  private currentState: ConnectivityState = ConnectivityState.IDLE;
  private readonly defaultServiceConfig: ServiceConfig;
  /**
   * The service config object from the last successful resolution, if
   * available. A value of null indicates that we have not yet received a valid
   * service config from the resolver.
   */
  private previousServiceConfig: ServiceConfig | null = null;

/**
   * The backoff timer for handling name resolution failures.
   */
  private readonly backoffTimeout: BackoffTimeout;

/**
   * Indicates whether we should attempt to resolve again after the backoff
   * timer runs out.
   */
  private continueResolving = false;

/**
   * Wrapper class that behaves like a `LoadBalancer` and also handles name
   * resolution internally.
   * @param target The address of the backend to connect to.
   * @param channelControlHelper `ChannelControlHelper` instance provided by
   *     this load balancer's owner.
   * @param defaultServiceConfig The default service configuration to be used
   *     if none is provided by the name resolver. A `null` value indicates
   *     that the default behavior should be the default unconfigured behavior.
   *     In practice, that means using the "pick first" load balancer
   *     implmentation
   */
  constructor(
    private readonly target: GrpcUri,
    private readonly channelControlHelper: ChannelControlHelper,
    private readonly channelOptions: ChannelOptions,
    private readonly onSuccessfulResolution: ResolutionCallback,
    private readonly onFailedResolution: ResolutionFailureCallback
  ) {
    if (channelOptions['grpc.service_config']) {
      this.defaultServiceConfig = validateServiceConfig(
        JSON.parse(channelOptions['grpc.service_config']!)
      );
    } else {
      this.defaultServiceConfig = {
        loadBalancingConfig: [],
        methodConfig: [],
      };
    }
    this.updateState(ConnectivityState.IDLE, new QueuePicker(this));
    this.childLoadBalancer = new ChildLoadBalancerHandler({
      createSubchannel: channelControlHelper.createSubchannel.bind(
        channelControlHelper
      ),
      requestReresolution: () => {
        /* If the backoffTimeout is running, we're still backing off from
         * making resolve requests, so we shouldn't make another one here.
         * In that case, the backoff timer callback will call
         * updateResolution */
        if (this.backoffTimeout.isRunning()) {
          this.continueResolving = true;
        } else {
          this.updateResolution();
        }
      },
      updateState: (newState: ConnectivityState, picker: Picker) => {
        this.latestChildState = newState;
        this.latestChildPicker = picker;
        this.updateState(newState, picker);
      },
      addChannelzChild: channelControlHelper.addChannelzChild.bind(
        channelControlHelper
      ),
      removeChannelzChild: channelControlHelper.removeChannelzChild.bind(
        channelControlHelper
      )
    });
    this.innerResolver = createResolver(
      target,
      {
        onSuccessfulResolution: (
          addressList: SubchannelAddress[],
          serviceConfig: ServiceConfig | null,
          serviceConfigError: ServiceError | null,
          configSelector: ConfigSelector | null,
          attributes: { [key: string]: unknown }
        ) => {
          let workingServiceConfig: ServiceConfig | null = null;
          /* This first group of conditionals implements the algorithm described
           * in https://github.com/grpc/proposal/blob/master/A21-service-config-error-handling.md
           * in the section called "Behavior on receiving a new gRPC Config".
           */
          if (serviceConfig === null) {
            // Step 4 and 5
            if (serviceConfigError === null) {
              // Step 5
              this.previousServiceConfig = null;
              workingServiceConfig = this.defaultServiceConfig;
            } else {
              // Step 4
              if (this.previousServiceConfig === null) {
                // Step 4.ii
                this.handleResolutionFailure(serviceConfigError);
              } else {
                // Step 4.i
                workingServiceConfig = this.previousServiceConfig;
              }
            }
          } else {
            // Step 3
            workingServiceConfig = serviceConfig;
            this.previousServiceConfig = serviceConfig;
          }
          const workingConfigList =
            workingServiceConfig?.loadBalancingConfig ?? [];
          const loadBalancingConfig = getFirstUsableConfig(
            workingConfigList,
            true
          );
          if (loadBalancingConfig === null) {
            // There were load balancing configs but none are supported. This counts as a resolution failure
            this.handleResolutionFailure({
              code: Status.UNAVAILABLE,
              details:
                'All load balancer options in service config are not compatible',
              metadata: new Metadata(),
            });
            return;
          }
          this.childLoadBalancer.updateAddressList(
            addressList,
            loadBalancingConfig,
            attributes
          );
          const finalServiceConfig =
            workingServiceConfig ?? this.defaultServiceConfig;
          this.onSuccessfulResolution(
            finalServiceConfig,
            configSelector ?? getDefaultConfigSelector(finalServiceConfig)
          );
        },
        onError: (error: StatusObject) => {
          this.handleResolutionFailure(error);
        },
      },
      channelOptions
    );
    const backoffOptions: BackoffOptions = {
      initialDelay: channelOptions['grpc.initial_reconnect_backoff_ms'],
      maxDelay: channelOptions['grpc.max_reconnect_backoff_ms'],
    };
    this.backoffTimeout = new BackoffTimeout(() => {
      if (this.continueResolving) {
        this.updateResolution();
        this.continueResolving = false;
      } else {
        this.updateState(this.latestChildState, this.latestChildPicker);
      }
    }, backoffOptions);
    this.backoffTimeout.unref();
  }

private updateResolution() {
    this.innerResolver.updateResolution();
    if (this.currentState === ConnectivityState.IDLE) {
      this.updateState(ConnectivityState.CONNECTING, new QueuePicker(this));
    }
    this.backoffTimeout.runOnce();
  }

private updateState(connectivityState: ConnectivityState, picker: Picker) {
    trace(
      uriToString(this.target) +
        ' ' +
        ConnectivityState[this.currentState] +
        ' -> ' +
        ConnectivityState[connectivityState]
    );
    // Ensure that this.exitIdle() is called by the picker
    if (connectivityState === ConnectivityState.IDLE) {
      picker = new QueuePicker(this);
    }
    this.currentState = connectivityState;
    this.channelControlHelper.updateState(connectivityState, picker);
  }

private handleResolutionFailure(error: StatusObject) {
    if (this.latestChildState === ConnectivityState.IDLE) {
      this.updateState(
        ConnectivityState.TRANSIENT_FAILURE,
        new UnavailablePicker(error)
      );
      this.onFailedResolution(error);
    }
  }

exitIdle() {
    if (this.currentState === ConnectivityState.IDLE || this.currentState === ConnectivityState.TRANSIENT_FAILURE) {
      if (this.backoffTimeout.isRunning()) {
        this.continueResolving = true;
      } else {
        this.updateResolution();
      }
    }
    this.childLoadBalancer.exitIdle();
  }

updateAddressList(
    addressList: SubchannelAddress[],
    lbConfig: LoadBalancingConfig | null
  ): never {
    throw new Error('updateAddressList not supported on ResolvingLoadBalancer');
  }

resetBackoff() {
    this.backoffTimeout.reset();
    this.childLoadBalancer.resetBackoff();
  }

destroy() {
    this.childLoadBalancer.destroy();
    this.innerResolver.destroy();
    this.updateState(ConnectivityState.SHUTDOWN, new UnavailablePicker());
  }

getTypeName() {
    return 'resolving_load_balancer';
  }
}

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