@oada/client
Version:
A lightweight client tool to interact with an OADA-compliant server
95 lines • 3.08 kB
JavaScript
/**
* @license
* Copyright 2021 Open Ag Data Alliance
*
* 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 debug from "debug";
import resolveALPN from "resolve-alpn";
import { HttpClient } from "./http.js";
import { WebSocketClient } from "./websocket.js";
const error = debug("@oada/client:auto:error");
function tryDomain(domain) {
const url = new URL(domain);
switch (url.protocol) {
case "http2:": {
return Object.assign(url, {
port: Number(url.port) || 80,
protocols: ["h2"],
});
}
case "https:": {
return Object.assign(url, {
port: Number(url.port) || 443,
protocols: ["h2", "http/1.1", "http/1.0"],
});
}
case "http:": {
return Object.assign(url, {
port: Number(url.port) || 80,
protocols: ["http/1.1", "http/1.0"],
});
}
default: {
throw new Error(`Unsupported domain protocol: ${url.protocol}`);
}
}
}
export function parseDomain(domain) {
try {
return tryDomain(domain);
}
catch {
// Assume https?
return tryDomain(`https://${domain}`);
}
}
/**
* Try to pick most appropriate connection type.
*/
export async function autoConnection({ domain, token, concurrency, userAgent, timeouts, }) {
try {
const { hostname, port, protocols } = parseDomain(domain);
const { alpnProtocol } = await resolveALPN({
host: hostname,
servername: hostname,
port,
rejectUnauthorized: false,
ALPNProtocols: protocols,
});
switch (alpnProtocol) {
// Prefer HTTP/2
case "h2": {
return new HttpClient(domain, token, {
concurrency,
userAgent,
timeouts,
});
}
// If no HTTP/2, use a WebSocket
case "http/1.1":
case "http/1.0": {
return new WebSocketClient(domain, { concurrency, userAgent });
}
default: {
throw new Error(`Unsupported ALPN protocol: ${alpnProtocol}`);
}
}
}
catch (cError) {
// Fallback to HTTP on error
error(cError, "Failed to auto pick connection type, falling back to HTTP");
return new HttpClient(domain, token, { concurrency, userAgent, timeouts });
}
}
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