@opentelemetry/exporter-zipkin
Version:
OpenTelemetry Zipkin Exporter allows the user to send collected traces to Zipkin.
94 lines • 2.87 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
import { diag } from '@opentelemetry/api';
import { ExportResultCode, globalErrorHandler } from '@opentelemetry/core';
/**
* Prepares send function that will send spans to the remote Zipkin service.
* @param urlStr - url to send spans
* @param headers - headers
* send
*/
export function prepareSend(urlStr, headers) {
let xhrHeaders;
const useBeacon = typeof navigator.sendBeacon === 'function' && !headers;
if (headers) {
xhrHeaders = {
Accept: 'application/json',
'Content-Type': 'application/json',
...headers,
};
}
/**
* Send spans to the remote Zipkin service.
*/
return function send(zipkinSpans, done) {
if (zipkinSpans.length === 0) {
diag.debug('Zipkin send with empty spans');
return done({ code: ExportResultCode.SUCCESS });
}
const payload = JSON.stringify(zipkinSpans);
if (useBeacon) {
sendWithBeacon(payload, done, urlStr);
}
else {
sendWithXhr(payload, done, urlStr, xhrHeaders);
}
};
}
/**
* Sends data using beacon
* @param data
* @param done
* @param urlStr
*/
function sendWithBeacon(data, done, urlStr) {
if (navigator.sendBeacon(urlStr, data)) {
diag.debug('sendBeacon - can send', data);
done({ code: ExportResultCode.SUCCESS });
}
else {
done({
code: ExportResultCode.FAILED,
error: new Error(`sendBeacon - cannot send ${data}`),
});
}
}
/**
* Sends data using XMLHttpRequest
* @param data
* @param done
* @param urlStr
* @param xhrHeaders
*/
function sendWithXhr(data, done, urlStr, xhrHeaders = {}) {
const xhr = new XMLHttpRequest();
xhr.open('POST', urlStr);
Object.entries(xhrHeaders).forEach(([k, v]) => {
xhr.setRequestHeader(k, v);
});
xhr.onreadystatechange = () => {
if (xhr.readyState === XMLHttpRequest.DONE) {
const statusCode = xhr.status || 0;
diag.debug(`Zipkin response status code: ${statusCode}, body: ${data}`);
if (xhr.status >= 200 && xhr.status < 400) {
return done({ code: ExportResultCode.SUCCESS });
}
else {
return done({
code: ExportResultCode.FAILED,
error: new Error(`Got unexpected status code from zipkin: ${xhr.status}`),
});
}
}
};
xhr.onerror = msg => {
globalErrorHandler(new Error(`Zipkin request error: ${msg}`));
return done({ code: ExportResultCode.FAILED });
};
// Issue request to remote service
diag.debug(`Zipkin request payload: ${data}`);
xhr.send(data);
}
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