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Merge pull request #1752 from murgatroid99/grpc-js_ip_scheme
grpc-js: Add support for ipv4 and ipv6 schemes
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/* | ||
* 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. | ||
*/ | ||
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import { isIPv4, isIPv6 } from "net"; | ||
import { StatusObject } from "./call-stream"; | ||
import { ChannelOptions } from "./channel-options"; | ||
import { LogVerbosity, Status } from "./constants"; | ||
import { Metadata } from "./metadata"; | ||
import { registerResolver, Resolver, ResolverListener } from "./resolver"; | ||
import { SubchannelAddress } from "./subchannel"; | ||
import { GrpcUri, splitHostPort, uriToString } from "./uri-parser"; | ||
import * as logging from './logging'; | ||
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const TRACER_NAME = 'ip_resolver'; | ||
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function trace(text: string): void { | ||
logging.trace(LogVerbosity.DEBUG, TRACER_NAME, text); | ||
} | ||
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const IPV4_SCHEME = 'ipv4'; | ||
const IPV6_SCHEME = 'ipv6'; | ||
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/** | ||
* The default TCP port to connect to if not explicitly specified in the target. | ||
*/ | ||
const DEFAULT_PORT = 443; | ||
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class IpResolver implements Resolver { | ||
private addresses: SubchannelAddress[] = []; | ||
private error: StatusObject | null = null; | ||
constructor( | ||
private 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 { | ||
process.nextTick(() => { | ||
if (this.error) { | ||
this.listener.onError(this.error) | ||
} else { | ||
this.listener.onSuccessfulResolution(this.addresses, null, null, null, {}); | ||
} | ||
}); | ||
} | ||
destroy(): void { | ||
// This resolver owns no resources, so we do nothing here. | ||
} | ||
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static getDefaultAuthority(target: GrpcUri): string { | ||
return target.path.split(',')[0]; | ||
} | ||
} | ||
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export function setup() { | ||
registerResolver(IPV4_SCHEME, IpResolver); | ||
registerResolver(IPV6_SCHEME, IpResolver); | ||
} |
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