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util.ts
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util.ts
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/*
* Copyright The OpenTelemetry 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
*
* https://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 * as url from 'url';
import * as http from 'http';
import * as https from 'https';
import * as zlib from 'zlib';
import { Readable } from 'stream';
import { OTLPExporterNodeBase } from './OTLPExporterNodeBase';
import { OTLPExporterNodeConfigBase } from '.';
import { diag } from '@opentelemetry/api';
import { CompressionAlgorithm } from './types';
import { getEnv } from '@opentelemetry/core';
import { OTLPExporterError } from '../../types';
import {
DEFAULT_EXPORT_MAX_ATTEMPTS,
DEFAULT_EXPORT_INITIAL_BACKOFF,
DEFAULT_EXPORT_BACKOFF_MULTIPLIER,
DEFAULT_EXPORT_MAX_BACKOFF,
isExportRetryable,
parseRetryAfterToMills,
} from '../../util';
/**
* Sends data using http
* @param collector
* @param data
* @param contentType
* @param onSuccess
* @param onError
*/
export function sendWithHttp<ExportItem, ServiceRequest>(
collector: OTLPExporterNodeBase<ExportItem, ServiceRequest>,
data: string | Buffer,
contentType: string,
onSuccess: () => void,
onError: (error: OTLPExporterError) => void
): void {
const exporterTimeout = collector.timeoutMillis;
const parsedUrl = new url.URL(collector.url);
const nodeVersion = Number(process.versions.node.split('.')[0]);
let retryTimer: ReturnType<typeof setTimeout>;
let req: http.ClientRequest;
let reqIsDestroyed = false;
const exporterTimer = setTimeout(() => {
clearTimeout(retryTimer);
reqIsDestroyed = true;
if (req.destroyed) {
const err = new OTLPExporterError('Request Timeout');
onError(err);
} else {
// req.abort() was deprecated since v14
nodeVersion >= 14 ? req.destroy() : req.abort();
}
}, exporterTimeout);
const options: http.RequestOptions | https.RequestOptions = {
hostname: parsedUrl.hostname,
port: parsedUrl.port,
path: parsedUrl.pathname,
method: 'POST',
headers: {
'Content-Type': contentType,
...collector.headers,
},
agent: collector.agent,
};
const request = parsedUrl.protocol === 'http:' ? http.request : https.request;
const sendWithRetry = (
retries = DEFAULT_EXPORT_MAX_ATTEMPTS,
minDelay = DEFAULT_EXPORT_INITIAL_BACKOFF
) => {
req = request(options, (res: http.IncomingMessage) => {
let responseData = '';
res.on('data', chunk => (responseData += chunk));
res.on('aborted', () => {
if (reqIsDestroyed) {
const err = new OTLPExporterError('Request Timeout');
onError(err);
}
});
res.on('end', () => {
if (reqIsDestroyed === false) {
if (res.statusCode && res.statusCode < 299) {
diag.debug(`statusCode: ${res.statusCode}`, responseData);
onSuccess();
// clear all timers since request was completed and promise was resolved
clearTimeout(exporterTimer);
clearTimeout(retryTimer);
} else if (
res.statusCode &&
isExportRetryable(res.statusCode) &&
retries > 0
) {
let retryTime: number;
minDelay = DEFAULT_EXPORT_BACKOFF_MULTIPLIER * minDelay;
// retry after interval specified in Retry-After header
if (res.headers['retry-after']) {
retryTime = parseRetryAfterToMills(res.headers['retry-after']!);
} else {
// exponential backoff with jitter
retryTime = Math.round(
Math.random() * (DEFAULT_EXPORT_MAX_BACKOFF - minDelay) +
minDelay
);
}
retryTimer = setTimeout(() => {
sendWithRetry(retries - 1, minDelay);
}, retryTime);
} else {
const error = new OTLPExporterError(
res.statusMessage,
res.statusCode,
responseData
);
onError(error);
// clear all timers since request was completed and promise was resolved
clearTimeout(exporterTimer);
clearTimeout(retryTimer);
}
}
});
});
req.on('error', (error: Error | any) => {
if (reqIsDestroyed) {
const err = new OTLPExporterError('Request Timeout', error.code);
onError(err);
} else {
onError(error);
}
clearTimeout(exporterTimer);
clearTimeout(retryTimer);
});
req.on('abort', () => {
if (reqIsDestroyed) {
const err = new OTLPExporterError('Request Timeout');
onError(err);
}
clearTimeout(exporterTimer);
clearTimeout(retryTimer);
});
switch (collector.compression) {
case CompressionAlgorithm.GZIP: {
req.setHeader('Content-Encoding', 'gzip');
const dataStream = readableFromBuffer(data);
dataStream
.on('error', onError)
.pipe(zlib.createGzip())
.on('error', onError)
.pipe(req);
break;
}
default:
req.end(data);
break;
}
};
sendWithRetry();
}
function readableFromBuffer(buff: string | Buffer): Readable {
const readable = new Readable();
readable.push(buff);
readable.push(null);
return readable;
}
export function createHttpAgent(
config: OTLPExporterNodeConfigBase
): http.Agent | https.Agent | undefined {
if (config.httpAgentOptions && config.keepAlive === false) {
diag.warn('httpAgentOptions is used only when keepAlive is true');
return undefined;
}
if (config.keepAlive === false || !config.url) return undefined;
try {
const parsedUrl = new url.URL(config.url as string);
const Agent = parsedUrl.protocol === 'http:' ? http.Agent : https.Agent;
return new Agent({ keepAlive: true, ...config.httpAgentOptions });
} catch (err) {
diag.error(
`collector exporter failed to create http agent. err: ${err.message}`
);
return undefined;
}
}
export function configureCompression(
compression: CompressionAlgorithm | undefined
): CompressionAlgorithm {
if (compression) {
return compression;
} else {
const definedCompression =
getEnv().OTEL_EXPORTER_OTLP_TRACES_COMPRESSION ||
getEnv().OTEL_EXPORTER_OTLP_COMPRESSION;
return definedCompression === CompressionAlgorithm.GZIP
? CompressionAlgorithm.GZIP
: CompressionAlgorithm.NONE;
}
}