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Java SDK for Microsoft Azure Data Lake Store
/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
* See License.txt in the project root for license information.
*/
package com.microsoft.azure.datalake.store;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.microsoft.azure.datalake.store.retrypolicies.NonIdempotentRetryPolicy;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.*;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* The core class that does the actual network communication. All the REST methods
* use this class to make HTTP calls.
*
* There are two calls in this class:
* makeSingleCall - this makes an HTTP request.
* makeCall - wraps retries around makeSingleCall
*
*/
class HttpTransport {
private static final String API_VERSION = "2017-08-01"; // API version used in REST requests
private static final Logger log = LoggerFactory.getLogger("com.microsoft.azure.datalake.store.HttpTransport");
private static final Logger tokenlog = LoggerFactory.getLogger("com.microsoft.azure.datalake.store.HttpTransport.tokens");
/**
* calls {@link #makeSingleCall(ADLStoreClient, Operation, String, QueryParams, byte[], int, int, RequestOptions, OperationResponse) makeSingleCall}
* in a retry loop. The retry policies are dictated by the {@link com.microsoft.azure.datalake.store.retrypolicies.RetryPolicy RetryPolicy} passed in.
*
* @param client the the {@link ADLStoreClient}
* @param op the WebHDFS operation tp perform
* @param path the path to operate on
* @param queryParams query parameter names and values to include on the URL of the request
* @param requestBody the body of the request, if applicable. can be {@code null}
* @param offsetWithinContentsArray offset within the byte array passed in {@code requestBody}. Bytes starting
* at this offset will be sent to server
* @param length number of bytes from {@code requestBody} to be sent
* @param opts options to change the behavior of the call
* @param resp response from the call, and any error info generated by the call
*/
static void makeCall (ADLStoreClient client,
Operation op,
String path,
QueryParams queryParams,
byte[] requestBody,
int offsetWithinContentsArray,
int length,
RequestOptions opts,
OperationResponse resp
)
{
if (opts == null) throw new IllegalArgumentException("RequestOptions parameter missing from call");
if (resp == null) throw new IllegalArgumentException("OperationResponse parameter missing from call");
if (opts.retryPolicy == null) {
opts.retryPolicy = new NonIdempotentRetryPolicy();
}
String clientRequestId;
if (opts.requestid == null) {
clientRequestId = UUID.randomUUID().toString();
} else {
clientRequestId = opts.requestid;
}
if (queryParams == null) queryParams = new QueryParams();
queryParams.setOp(op);
queryParams.setApiVersion(API_VERSION);
int retryCount = 0;
do {
opts.requestid = clientRequestId + "." + Integer.toString(retryCount);
resp.reset();
long start = System.nanoTime();
makeSingleCall(client, op, path, queryParams, requestBody, offsetWithinContentsArray, length, opts, resp);
resp.lastCallLatency = System.nanoTime() - start;
resp.lastCallLatency = resp.lastCallLatency / 1000000; // convert from nanoseconds to milliseconds
resp.numRetries = retryCount;
String respLength = (resp.responseChunked ? "chunked" : Long.toString(resp.responseContentLength));
String error = "";
String outcome = null;
if (isSuccessfulResponse(resp, op)) {
resp.successful = true;
outcome = "Succeeded";
LatencyTracker.addLatency(opts.requestid, retryCount, resp.lastCallLatency, op.name,
length + resp.responseContentLength, client.getClientId());
} else {
resp.successful = false;
outcome = "Failed";
if (resp.ex!=null) {
error = resp.ex.getClass().getName();
} else {
error = "HTTP" + resp.httpResponseCode + "(" + resp.remoteExceptionName + ")";
}
LatencyTracker.addError(opts.requestid, retryCount, resp.lastCallLatency, error, op.name,
length, client.getClientId());
retryCount++;
resp.exceptionHistory = resp.exceptionHistory == null ? error : resp.exceptionHistory + "," + error;
}
if (log.isDebugEnabled()) {
String logline =
"HTTPRequest," + outcome +
",cReqId:" + opts.requestid +
",lat:" + Long.toString(resp.lastCallLatency) +
",err:" + error +
",Reqlen:" + length +
",Resplen:" + respLength +
",token_ns:" + Long.toString(resp.tokenAcquisitionLatency) +
",sReqId:" + resp.requestId +
",path:" + path +
",qp:" + queryParams.serialize();
log.debug(logline);
}
} while (!resp.successful && opts.retryPolicy.shouldRetry(resp.httpResponseCode, resp.ex));
}
private static boolean isSuccessfulResponse(OperationResponse resp, Operation op) {
if (resp.ex != null) return false;
if (!resp.successful) return false;
if (resp.httpResponseCode >=100 && resp.httpResponseCode < 300) return true; // 1xx and 2xx return codes
return false; //anything else
}
/**
* Does the actual HTTP call to server. All REST API calls use this method to make their HTTP calls.
*
* This is a static, stateless, thread-safe method.
*
*
* @param client the the {@link ADLStoreClient}
* @param op the WebHDFS operation tp perform
* @param path the path to operate on
* @param queryParams query parameter names and values to include on the URL of the request
* @param requestBody the body of the request, if applicable. can be {@code null}
* @param offsetWithinContentsArray offset within the byte array passed in {@code requestBody}. Bytes starting
* at this offset will be sent to server
* @param length number of bytes from {@code requestBody} to be sent
* @param opts options to change the behavior of the call
* @param resp response from the call, and any error info generated by the call
*/
private static void makeSingleCall(ADLStoreClient client,
Operation op,
String path,
QueryParams queryParams,
byte[] requestBody,
int offsetWithinContentsArray,
int length,
RequestOptions opts,
OperationResponse resp) {
if (client == null) throw new IllegalArgumentException("client is null");
if (client.getAccountName() == null || client.getAccountName().equals("")) {
resp.successful = false;
resp.message = "Account name or client is null or blank";
return;
}
String token = null;
long tokenStartTime = System.nanoTime();
try {
token = client.getAccessToken();
if (token == null || token.equals("")) {
resp.successful = false;
resp.message = "Access token is null or blank";
resp.tokenAcquisitionLatency = System.nanoTime() - tokenStartTime;
return;
}
} catch (IOException ex) {
resp.successful = false;
resp.message = "Error fetching access token";
resp.ex = ex;
resp.tokenAcquisitionLatency = System.nanoTime() - tokenStartTime;
return;
}
resp.tokenAcquisitionLatency = System.nanoTime() - tokenStartTime;
if (op == null) {
resp.successful = false;
resp.message = "operation is null";
return;
}
if (path == null || path.trim().equals("")) {
resp.successful = false;
resp.message = "path is null";
return;
}
resp.opCode = op.name;
if (requestBody != null && requestBody.length > 0) {
if (offsetWithinContentsArray < 0 ||
length < 0 ||
offsetWithinContentsArray + length < 0 || // integer overflow
offsetWithinContentsArray >= requestBody.length ||
offsetWithinContentsArray + length > requestBody.length) {
throw new IndexOutOfBoundsException("offset+length overflows byte buffer for path " + path);
}
} else {
if (offsetWithinContentsArray != 0 || length != 0) {
throw new IndexOutOfBoundsException("Non-zero offset or length with null body for path " + path);
}
}
// Build URL
StringBuilder urlString = new StringBuilder();
urlString.append(client.getHttpPrefix()); // http or https
urlString.append("://");
urlString.append(client.getAccountName());
urlString.append(op.namespace);
String prefix = client.getFilePathPrefix();
if (prefix != null) urlString.append(prefix);
if (path.charAt(0) != '/') urlString.append('/');
try {
urlString.append((new URI(null, null, path, null)).toASCIIString()); // use URI to encode path
} catch (URISyntaxException ex) {
resp.successful = false;
resp.message = "Invalid path " + path;
return;
}
urlString.append('?');
urlString.append(queryParams.serialize());
URL url;
try {
url = new URL(urlString.toString());
} catch (MalformedURLException ex) {
resp.ex = ex;
resp.successful = false;
return;
}
HttpURLConnection conn = null;
try {
// Setup Http Request (method and headers)
conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("Authorization", token);
conn.setRequestProperty("User-Agent", client.getUserAgent());
conn.setRequestProperty("x-ms-client-request-id", opts.requestid);
String latencyHeader = LatencyTracker.get();
if (latencyHeader != null) conn.setRequestProperty("x-ms-adl-client-latency", latencyHeader);
if (client.getTiHeaderValue() != null)
conn.setRequestProperty("x-ms-tracking-info", client.getTiHeaderValue());
conn.setConnectTimeout(opts.timeout);
conn.setReadTimeout(opts.timeout);
conn.setUseCaches(false);
conn.setRequestMethod(op.method);
conn.setDoInput(true);
// populate request body if applicable
if (!op.method.equals("GET")) {
conn.setDoOutput(true);
conn.setRequestMethod(op.method);
OutputStream outStr = conn.getOutputStream();
if (op.requiresBody && requestBody != null) {
outStr.write(requestBody, offsetWithinContentsArray, length);
outStr.close();
} else {
// server *requires* a Content-Length header, and doesnt take absence of header as 0 (bad behavior)
// The only way to force java to send "Content-Length:0" is to do this.
// Setting Content-Length header to 0 using setRequestProprty doesnt work (bad behavior)
byte[] buf = new byte[]{}; // zero-length byte-array
outStr.write(buf);
outStr.close();
}
}
// get Response Stream if applicable
resp.httpResponseCode = conn.getResponseCode();
resp.httpResponseMessage = conn.getResponseMessage();
resp.requestId = conn.getHeaderField("x-ms-request-id");
resp.responseContentLength = conn.getHeaderFieldLong("Content-Length", 0);
String chunked = conn.getHeaderField("Transfer-Encoding");
if (chunked != null && chunked.equals("chunked")) resp.responseChunked = true;
// if request failed, then the body of an HTTP 4xx or 5xx response contains error info as JSon
if (resp.httpResponseCode >= 400) {
if (resp.httpResponseCode == 401 && tokenlog.isDebugEnabled()) { // log auth token errors separately
String logline = "HTTPRequest,HTTP401,cReqId:" +
opts.requestid + ",sReqId:" +
resp.requestId + ",path:" +
path + ",token:" +
token; // ok to log, since token doesn't seem to be working anyway
tokenlog.debug(logline);
}
if (resp.responseContentLength > 0 && conn.getErrorStream() != null) {
getCodesFromJSon(conn.getErrorStream(), resp);
return;
}
} else {
consumeInputStream(conn.getErrorStream()); // read(ignore) and close if the stream exists
if (op.returnsBody) { // response stream will be handled by caller
resp.responseStream = conn.getInputStream();
} else { // read and discard response stream so it is consumed and connection can be reused
consumeInputStream(conn.getInputStream());
}
}
} catch (IOException ex) {
resp.ex = ex;
resp.successful = false;
if (conn != null) {
try {
consumeInputStream(conn.getInputStream()); // read(ignore) and close if the stream exists
consumeInputStream(conn.getErrorStream()); // read(ignore) and close if the stream exists
} catch (IOException ex2) {
// ignore, since we already have the root IOException - this part is just when cleaning up error stream
}
}
}
}
static void consumeInputStream(InputStream istr) throws IOException {
if (istr != null) {
try {
byte[] b = new byte[65536];
while (istr.read(b) >= 0) ; // read and discard
} finally {
istr.close();
}
}
}
private static void getCodesFromJSon(InputStream s, OperationResponse resp) {
try {
JsonFactory jf = new JsonFactory();
JsonParser jp = jf.createParser(s);
String fieldName, fieldValue;
jp.nextToken(); // START_OBJECT - {
jp.nextToken(); // FIELD_NAME - "RemoteException":
jp.nextToken(); // START_OBJECT - {
jp.nextToken();
while (jp.hasCurrentToken()) {
if (jp.getCurrentToken() == JsonToken.FIELD_NAME) {
fieldName = jp.getCurrentName();
jp.nextToken();
fieldValue = jp.getText();
if (fieldName.equals("exception")) resp.remoteExceptionName = fieldValue;
if (fieldName.equals("message")) resp.remoteExceptionMessage = fieldValue;
if (fieldName.equals("javaClassName")) resp.remoteExceptionJavaClassName = fieldValue;
}
jp.nextToken();
}
jp.close();
} catch (IOException ex) {}
finally {
try {
s.close();
} catch (IOException ex) { }
}
}
}
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