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| // @flow
// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import dgram from 'dgram';
import fs from 'fs';
import path from 'path';
import {Thrift} from 'thriftrw';
const HOST = 'localhost';
const PORT = 6832;
const UDP_PACKET_MAX_LENGTH = 65000;
export default class UDPSender {
_host: string;
_port: number;
_maxPacketSize: number;
_process: Process;
_emitSpanBatchOverhead: number;
_maxSpanBytes: number;
_client: any;
_spec: any;
_byteBufferSize: number;
_thrift: any;
_batch: Batch;
_thriftProcessMessage: any;
constructor(options: any = {}) {
this._host = options.host || HOST;
this._port = options.port || PORT;
this._maxPacketSize = options.maxPacketSize || UDP_PACKET_MAX_LENGTH;
this._byteBufferSize = 0;
this._client = dgram.createSocket('udp4');
this._spec = fs.readFileSync(path.join(__dirname, '../jaeger-idl/thrift/jaeger.thrift'), 'ascii');
this._thrift = new Thrift({
source: this._spec,
allowOptionalArguments: true
});
}
_calcBatchSize(batch: Batch) {
return this._thrift.Agent.emitBatch.argumentsMessageRW.byteLength(
this._convertBatchToThriftMessage(this._batch)
).length;
}
_calcSpanSize(span: any): number {
return this._thrift.Span.rw.byteLength(new this._thrift.Span(span)).length;
}
setProcess(process: Process): void {
// This function is only called once during reporter construction, and thus will
// give us the length of the batch before any spans have been added to the span
// list in batch.
this._process = process;
this._batch = {
'process': this._process,
'spans': []
};
let tagMessages = [];
for (let j = 0; j < this._batch.process.tags.length; j++) {
let tag = this._batch.process.tags[j];
tagMessages.push(new this._thrift.Tag(tag));
}
this._thriftProcessMessage = new this._thrift.Process({
serviceName: this._batch.process.serviceName,
tags: tagMessages
});
this._emitSpanBatchOverhead = this._calcBatchSize(this._batch);
this._maxSpanBytes = this._maxPacketSize - this._emitSpanBatchOverhead;
}
append(span: any): SenderResponse {
let spanSize: number = this._calcSpanSize(span);
if (spanSize > this._maxSpanBytes) {
return { err: true, numSpans: 1 };
}
this._byteBufferSize += spanSize;
if (this._byteBufferSize <= this._maxSpanBytes) {
this._batch.spans.push(span);
if (this._byteBufferSize < this._maxSpanBytes) {
return {err: false, numSpans: 0};
}
return this.flush();
}
let flushResponse: SenderResponse = this.flush();
this._batch.spans.push(span);
this._byteBufferSize = spanSize;
return flushResponse;
}
flush(): SenderResponse {
let numSpans: number = this._batch.spans.length;
if (numSpans == 0) {
return {err: false, numSpans: 0}
}
let bufferLen = this._byteBufferSize + this._emitSpanBatchOverhead;
let thriftBuffer = new Buffer(bufferLen);
let bufferResult = this._thrift.Agent.emitBatch.argumentsMessageRW.writeInto(
this._convertBatchToThriftMessage(this._batch), thriftBuffer, 0
);
if (bufferResult.err) {
console.log('err', bufferResult.err);
return {err: true, numSpans: numSpans};
}
// TODO(oibe) use callback in send
this._client.send(thriftBuffer, 0, thriftBuffer.length, this._port, this._host);
this._reset();
return {err: false, numSpans: numSpans};
}
_convertBatchToThriftMessage() {
let spanMessages = [];
for (let i = 0; i < this._batch.spans.length; i++) {
let span = this._batch.spans[i];
spanMessages.push(new this._thrift.Span(span))
}
return new this._thrift.Agent.emitBatch.ArgumentsMessage({
version: 1,
id: 0,
body: {batch: new this._thrift.Batch({
process: this._thriftProcessMessage,
spans: spanMessages
})}
});
}
_reset() {
this._batch.spans = [];
this._byteBufferSize = 0;
}
close(): void {
this._client.close();
}
}
|