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Просмотр файла: internal-channel.js
"use strict";
/*
* 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.
*
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.InternalChannel = void 0;
const channel_credentials_1 = require("./channel-credentials");
const resolving_load_balancer_1 = require("./resolving-load-balancer");
const subchannel_pool_1 = require("./subchannel-pool");
const picker_1 = require("./picker");
const constants_1 = require("./constants");
const filter_stack_1 = require("./filter-stack");
const compression_filter_1 = require("./compression-filter");
const resolver_1 = require("./resolver");
const logging_1 = require("./logging");
const max_message_size_filter_1 = require("./max-message-size-filter");
const http_proxy_1 = require("./http_proxy");
const uri_parser_1 = require("./uri-parser");
const connectivity_state_1 = require("./connectivity-state");
const channelz_1 = require("./channelz");
const load_balancing_call_1 = require("./load-balancing-call");
const resolving_call_1 = require("./resolving-call");
const call_number_1 = require("./call-number");
const control_plane_status_1 = require("./control-plane-status");
const retrying_call_1 = require("./retrying-call");
/**
* See https://nodejs.org/api/timers.html#timers_setinterval_callback_delay_args
*/
const MAX_TIMEOUT_TIME = 2147483647;
const RETRY_THROTTLER_MAP = new Map();
const DEFAULT_RETRY_BUFFER_SIZE_BYTES = 1 << 24; // 16 MB
const DEFAULT_PER_RPC_RETRY_BUFFER_SIZE_BYTES = 1 << 20; // 1 MB
class InternalChannel {
constructor(target, credentials, options) {
var _a, _b, _c, _d, _e, _f;
this.credentials = credentials;
this.options = options;
this.connectivityState = connectivity_state_1.ConnectivityState.IDLE;
this.currentPicker = new picker_1.UnavailablePicker();
/**
* Calls queued up to get a call config. Should only be populated before the
* first time the resolver returns a result, which includes the ConfigSelector.
*/
this.configSelectionQueue = [];
this.pickQueue = [];
this.connectivityStateWatchers = [];
this.configSelector = null;
/**
* This is the error from the name resolver if it failed most recently. It
* is only used to end calls that start while there is no config selector
* and the name resolver is in backoff, so it should be nulled if
* configSelector becomes set or the channel state becomes anything other
* than TRANSIENT_FAILURE.
*/
this.currentResolutionError = null;
// Channelz info
this.channelzEnabled = true;
this.callTracker = new channelz_1.ChannelzCallTracker();
this.childrenTracker = new channelz_1.ChannelzChildrenTracker();
if (typeof target !== 'string') {
throw new TypeError('Channel target must be a string');
}
if (!(credentials instanceof channel_credentials_1.ChannelCredentials)) {
throw new TypeError('Channel credentials must be a ChannelCredentials object');
}
if (options) {
if (typeof options !== 'object') {
throw new TypeError('Channel options must be an object');
}
}
this.originalTarget = target;
const originalTargetUri = uri_parser_1.parseUri(target);
if (originalTargetUri === null) {
throw new Error(`Could not parse target name "${target}"`);
}
/* This ensures that the target has a scheme that is registered with the
* resolver */
const defaultSchemeMapResult = resolver_1.mapUriDefaultScheme(originalTargetUri);
if (defaultSchemeMapResult === null) {
throw new Error(`Could not find a default scheme for target name "${target}"`);
}
this.callRefTimer = setInterval(() => { }, MAX_TIMEOUT_TIME);
(_b = (_a = this.callRefTimer).unref) === null || _b === void 0 ? void 0 : _b.call(_a);
if (this.options['grpc.enable_channelz'] === 0) {
this.channelzEnabled = false;
}
this.channelzTrace = new channelz_1.ChannelzTrace();
this.channelzRef = channelz_1.registerChannelzChannel(target, () => this.getChannelzInfo(), this.channelzEnabled);
if (this.channelzEnabled) {
this.channelzTrace.addTrace('CT_INFO', 'Channel created');
}
if (this.options['grpc.default_authority']) {
this.defaultAuthority = this.options['grpc.default_authority'];
}
else {
this.defaultAuthority = resolver_1.getDefaultAuthority(defaultSchemeMapResult);
}
const proxyMapResult = http_proxy_1.mapProxyName(defaultSchemeMapResult, options);
this.target = proxyMapResult.target;
this.options = Object.assign({}, this.options, proxyMapResult.extraOptions);
/* The global boolean parameter to getSubchannelPool has the inverse meaning to what
* the grpc.use_local_subchannel_pool channel option means. */
this.subchannelPool = subchannel_pool_1.getSubchannelPool(((_c = options['grpc.use_local_subchannel_pool']) !== null && _c !== void 0 ? _c : 0) === 0);
this.retryBufferTracker = new retrying_call_1.MessageBufferTracker((_d = options['grpc.retry_buffer_size']) !== null && _d !== void 0 ? _d : DEFAULT_RETRY_BUFFER_SIZE_BYTES, (_e = options['grpc.per_rpc_retry_buffer_size']) !== null && _e !== void 0 ? _e : DEFAULT_PER_RPC_RETRY_BUFFER_SIZE_BYTES);
const channelControlHelper = {
createSubchannel: (subchannelAddress, subchannelArgs) => {
const subchannel = this.subchannelPool.getOrCreateSubchannel(this.target, subchannelAddress, Object.assign({}, this.options, subchannelArgs), this.credentials);
if (this.channelzEnabled) {
this.channelzTrace.addTrace('CT_INFO', 'Created subchannel or used existing subchannel', subchannel.getChannelzRef());
}
return subchannel;
},
updateState: (connectivityState, picker) => {
this.currentPicker = picker;
const queueCopy = this.pickQueue.slice();
this.pickQueue = [];
this.callRefTimerUnref();
for (const call of queueCopy) {
call.doPick();
}
this.updateState(connectivityState);
},
requestReresolution: () => {
// This should never be called.
throw new Error('Resolving load balancer should never call requestReresolution');
},
addChannelzChild: (child) => {
if (this.channelzEnabled) {
this.childrenTracker.refChild(child);
}
},
removeChannelzChild: (child) => {
if (this.channelzEnabled) {
this.childrenTracker.unrefChild(child);
}
}
};
this.resolvingLoadBalancer = new resolving_load_balancer_1.ResolvingLoadBalancer(this.target, channelControlHelper, options, (serviceConfig, configSelector) => {
if (serviceConfig.retryThrottling) {
RETRY_THROTTLER_MAP.set(this.getTarget(), new retrying_call_1.RetryThrottler(serviceConfig.retryThrottling.maxTokens, serviceConfig.retryThrottling.tokenRatio, RETRY_THROTTLER_MAP.get(this.getTarget())));
}
else {
RETRY_THROTTLER_MAP.delete(this.getTarget());
}
if (this.channelzEnabled) {
this.channelzTrace.addTrace('CT_INFO', 'Address resolution succeeded');
}
this.configSelector = configSelector;
this.currentResolutionError = null;
/* We process the queue asynchronously to ensure that the corresponding
* load balancer update has completed. */
process.nextTick(() => {
const localQueue = this.configSelectionQueue;
this.configSelectionQueue = [];
this.callRefTimerUnref();
for (const call of localQueue) {
call.getConfig();
}
this.configSelectionQueue = [];
});
}, (status) => {
if (this.channelzEnabled) {
this.channelzTrace.addTrace('CT_WARNING', 'Address resolution failed with code ' + status.code + ' and details "' + status.details + '"');
}
if (this.configSelectionQueue.length > 0) {
this.trace('Name resolution failed with calls queued for config selection');
}
if (this.configSelector === null) {
this.currentResolutionError = Object.assign(Object.assign({}, control_plane_status_1.restrictControlPlaneStatusCode(status.code, status.details)), { metadata: status.metadata });
}
const localQueue = this.configSelectionQueue;
this.configSelectionQueue = [];
this.callRefTimerUnref();
for (const call of localQueue) {
call.reportResolverError(status);
}
});
this.filterStackFactory = new filter_stack_1.FilterStackFactory([
new max_message_size_filter_1.MaxMessageSizeFilterFactory(this.options),
new compression_filter_1.CompressionFilterFactory(this, this.options),
]);
this.trace('Channel constructed with options ' + JSON.stringify(options, undefined, 2));
const error = new Error();
logging_1.trace(constants_1.LogVerbosity.DEBUG, 'channel_stacktrace', '(' + this.channelzRef.id + ') ' + 'Channel constructed \n' + ((_f = error.stack) === null || _f === void 0 ? void 0 : _f.substring(error.stack.indexOf('\n') + 1)));
}
getChannelzInfo() {
return {
target: this.originalTarget,
state: this.connectivityState,
trace: this.channelzTrace,
callTracker: this.callTracker,
children: this.childrenTracker.getChildLists()
};
}
trace(text, verbosityOverride) {
logging_1.trace(verbosityOverride !== null && verbosityOverride !== void 0 ? verbosityOverride : constants_1.LogVerbosity.DEBUG, 'channel', '(' + this.channelzRef.id + ') ' + uri_parser_1.uriToString(this.target) + ' ' + text);
}
callRefTimerRef() {
var _a, _b, _c, _d;
// If the hasRef function does not exist, always run the code
if (!((_b = (_a = this.callRefTimer).hasRef) === null || _b === void 0 ? void 0 : _b.call(_a))) {
this.trace('callRefTimer.ref | configSelectionQueue.length=' +
this.configSelectionQueue.length +
' pickQueue.length=' +
this.pickQueue.length);
(_d = (_c = this.callRefTimer).ref) === null || _d === void 0 ? void 0 : _d.call(_c);
}
}
callRefTimerUnref() {
var _a, _b;
// If the hasRef function does not exist, always run the code
if (!this.callRefTimer.hasRef || this.callRefTimer.hasRef()) {
this.trace('callRefTimer.unref | configSelectionQueue.length=' +
this.configSelectionQueue.length +
' pickQueue.length=' +
this.pickQueue.length);
(_b = (_a = this.callRefTimer).unref) === null || _b === void 0 ? void 0 : _b.call(_a);
}
}
removeConnectivityStateWatcher(watcherObject) {
const watcherIndex = this.connectivityStateWatchers.findIndex((value) => value === watcherObject);
if (watcherIndex >= 0) {
this.connectivityStateWatchers.splice(watcherIndex, 1);
}
}
updateState(newState) {
logging_1.trace(constants_1.LogVerbosity.DEBUG, 'connectivity_state', '(' + this.channelzRef.id + ') ' +
uri_parser_1.uriToString(this.target) +
' ' +
connectivity_state_1.ConnectivityState[this.connectivityState] +
' -> ' +
connectivity_state_1.ConnectivityState[newState]);
if (this.channelzEnabled) {
this.channelzTrace.addTrace('CT_INFO', connectivity_state_1.ConnectivityState[this.connectivityState] + ' -> ' + connectivity_state_1.ConnectivityState[newState]);
}
this.connectivityState = newState;
const watchersCopy = this.connectivityStateWatchers.slice();
for (const watcherObject of watchersCopy) {
if (newState !== watcherObject.currentState) {
if (watcherObject.timer) {
clearTimeout(watcherObject.timer);
}
this.removeConnectivityStateWatcher(watcherObject);
watcherObject.callback();
}
}
if (newState !== connectivity_state_1.ConnectivityState.TRANSIENT_FAILURE) {
this.currentResolutionError = null;
}
}
doPick(metadata, extraPickInfo) {
return this.currentPicker.pick({ metadata: metadata, extraPickInfo: extraPickInfo });
}
queueCallForPick(call) {
this.pickQueue.push(call);
this.callRefTimerRef();
}
getConfig(method, metadata) {
this.resolvingLoadBalancer.exitIdle();
if (this.configSelector) {
return {
type: 'SUCCESS',
config: this.configSelector(method, metadata)
};
}
else {
if (this.currentResolutionError) {
return {
type: 'ERROR',
error: this.currentResolutionError
};
}
else {
return {
type: 'NONE'
};
}
}
}
queueCallForConfig(call) {
this.configSelectionQueue.push(call);
this.callRefTimerRef();
}
createLoadBalancingCall(callConfig, method, host, credentials, deadline) {
const callNumber = call_number_1.getNextCallNumber();
this.trace('createLoadBalancingCall [' +
callNumber +
'] method="' +
method +
'"');
return new load_balancing_call_1.LoadBalancingCall(this, callConfig, method, host, credentials, deadline, callNumber);
}
createRetryingCall(callConfig, method, host, credentials, deadline) {
const callNumber = call_number_1.getNextCallNumber();
this.trace('createRetryingCall [' +
callNumber +
'] method="' +
method +
'"');
return new retrying_call_1.RetryingCall(this, callConfig, method, host, credentials, deadline, callNumber, this.retryBufferTracker, RETRY_THROTTLER_MAP.get(this.getTarget()));
}
createInnerCall(callConfig, method, host, credentials, deadline) {
// Create a RetryingCall if retries are enabled
if (this.options['grpc.enable_retries'] === 0) {
return this.createLoadBalancingCall(callConfig, method, host, credentials, deadline);
}
else {
return this.createRetryingCall(callConfig, method, host, credentials, deadline);
}
}
createResolvingCall(method, deadline, host, parentCall, propagateFlags) {
const callNumber = call_number_1.getNextCallNumber();
this.trace('createResolvingCall [' +
callNumber +
'] method="' +
method +
'", deadline=' +
deadline);
const finalOptions = {
deadline: deadline,
flags: propagateFlags !== null && propagateFlags !== void 0 ? propagateFlags : constants_1.Propagate.DEFAULTS,
host: host !== null && host !== void 0 ? host : this.defaultAuthority,
parentCall: parentCall,
};
const call = new resolving_call_1.ResolvingCall(this, method, finalOptions, this.filterStackFactory.clone(), this.credentials._getCallCredentials(), callNumber);
if (this.channelzEnabled) {
this.callTracker.addCallStarted();
call.addStatusWatcher(status => {
if (status.code === constants_1.Status.OK) {
this.callTracker.addCallSucceeded();
}
else {
this.callTracker.addCallFailed();
}
});
}
return call;
}
close() {
this.resolvingLoadBalancer.destroy();
this.updateState(connectivity_state_1.ConnectivityState.SHUTDOWN);
clearInterval(this.callRefTimer);
if (this.channelzEnabled) {
channelz_1.unregisterChannelzRef(this.channelzRef);
}
this.subchannelPool.unrefUnusedSubchannels();
}
getTarget() {
return uri_parser_1.uriToString(this.target);
}
getConnectivityState(tryToConnect) {
const connectivityState = this.connectivityState;
if (tryToConnect) {
this.resolvingLoadBalancer.exitIdle();
}
return connectivityState;
}
watchConnectivityState(currentState, deadline, callback) {
if (this.connectivityState === connectivity_state_1.ConnectivityState.SHUTDOWN) {
throw new Error('Channel has been shut down');
}
let timer = null;
if (deadline !== Infinity) {
const deadlineDate = deadline instanceof Date ? deadline : new Date(deadline);
const now = new Date();
if (deadline === -Infinity || deadlineDate <= now) {
process.nextTick(callback, new Error('Deadline passed without connectivity state change'));
return;
}
timer = setTimeout(() => {
this.removeConnectivityStateWatcher(watcherObject);
callback(new Error('Deadline passed without connectivity state change'));
}, deadlineDate.getTime() - now.getTime());
}
const watcherObject = {
currentState,
callback,
timer,
};
this.connectivityStateWatchers.push(watcherObject);
}
/**
* Get the channelz reference object for this channel. The returned value is
* garbage if channelz is disabled for this channel.
* @returns
*/
getChannelzRef() {
return this.channelzRef;
}
createCall(method, deadline, host, parentCall, propagateFlags) {
if (typeof method !== 'string') {
throw new TypeError('Channel#createCall: method must be a string');
}
if (!(typeof deadline === 'number' || deadline instanceof Date)) {
throw new TypeError('Channel#createCall: deadline must be a number or Date');
}
if (this.connectivityState === connectivity_state_1.ConnectivityState.SHUTDOWN) {
throw new Error('Channel has been shut down');
}
return this.createResolvingCall(method, deadline, host, parentCall, propagateFlags);
}
}
exports.InternalChannel = InternalChannel;
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