File size: 3,665 Bytes
c1b3a0c |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 |
/*
* Copyright 2021 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 { isIPv4, isIPv6 } from 'net';
import { StatusObject } from './call-interface';
import { ChannelOptions } from './channel-options';
import { LogVerbosity, Status } from './constants';
import { Metadata } from './metadata';
import { registerResolver, Resolver, ResolverListener } from './resolver';
import { SubchannelAddress } from './subchannel-address';
import { GrpcUri, splitHostPort, uriToString } from './uri-parser';
import * as logging from './logging';
const TRACER_NAME = 'ip_resolver';
function trace(text: string): void {
logging.trace(LogVerbosity.DEBUG, TRACER_NAME, text);
}
const IPV4_SCHEME = 'ipv4';
const IPV6_SCHEME = 'ipv6';
/**
* The default TCP port to connect to if not explicitly specified in the target.
*/
const DEFAULT_PORT = 443;
class IpResolver implements Resolver {
private addresses: SubchannelAddress[] = [];
private error: StatusObject | null = null;
private hasReturnedResult = false;
constructor(
target: GrpcUri,
private listener: ResolverListener,
channelOptions: ChannelOptions
) {
trace('Resolver constructed for target ' + uriToString(target));
const addresses: SubchannelAddress[] = [];
if (!(target.scheme === IPV4_SCHEME || target.scheme === IPV6_SCHEME)) {
this.error = {
code: Status.UNAVAILABLE,
details: `Unrecognized scheme ${target.scheme} in IP resolver`,
metadata: new Metadata(),
};
return;
}
const pathList = target.path.split(',');
for (const path of pathList) {
const hostPort = splitHostPort(path);
if (hostPort === null) {
this.error = {
code: Status.UNAVAILABLE,
details: `Failed to parse ${target.scheme} address ${path}`,
metadata: new Metadata(),
};
return;
}
if (
(target.scheme === IPV4_SCHEME && !isIPv4(hostPort.host)) ||
(target.scheme === IPV6_SCHEME && !isIPv6(hostPort.host))
) {
this.error = {
code: Status.UNAVAILABLE,
details: `Failed to parse ${target.scheme} address ${path}`,
metadata: new Metadata(),
};
return;
}
addresses.push({
host: hostPort.host,
port: hostPort.port ?? DEFAULT_PORT,
});
}
this.addresses = addresses;
trace('Parsed ' + target.scheme + ' address list ' + this.addresses);
}
updateResolution(): void {
if (!this.hasReturnedResult) {
this.hasReturnedResult = true;
process.nextTick(() => {
if (this.error) {
this.listener.onError(this.error);
} else {
this.listener.onSuccessfulResolution(
this.addresses,
null,
null,
null,
{}
);
}
});
}
}
destroy(): void {
this.hasReturnedResult = false;
}
static getDefaultAuthority(target: GrpcUri): string {
return target.path.split(',')[0];
}
}
export function setup() {
registerResolver(IPV4_SCHEME, IpResolver);
registerResolver(IPV6_SCHEME, IpResolver);
}
|