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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.hadoop.fs.azurebfs.services;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants;
import org.apache.hadoop.fs.azurebfs.constants.HttpHeaderConfigurations;
import org.apache.hadoop.fs.azurebfs.contracts.services.AbfsPerfLoggable;
import org.apache.hadoop.fs.azurebfs.contracts.services.ListResultSchema;
import org.apache.hadoop.fs.azurebfs.utils.UriUtils;
/**
* Base Http operation class for orchestrating server IO calls. Child classes would
* define the certain orchestration implementation on the basis of network library used.
*
* For JDK netlib usage, the child class would be {@link AbfsJdkHttpOperation}.
* For ApacheHttpClient netlib usage, the child class would be {@link AbfsAHCHttpOperation}.
*/
public abstract class AbfsHttpOperation implements AbfsPerfLoggable {
private final Logger log;
private static final int CLEAN_UP_BUFFER_SIZE = 64 * 1024;
private static final int ONE_THOUSAND = 1000;
private static final int ONE_MILLION = ONE_THOUSAND * ONE_THOUSAND;
private final String method;
private final URL url;
private String maskedUrl;
private String maskedEncodedUrl;
private int statusCode;
private String statusDescription;
private String storageErrorCode = "";
private String storageErrorMessage = "";
private String requestId = "";
private String expectedAppendPos = "";
private ListResultSchema listResultSchema = null;
// metrics
private int bytesSent;
private int expectedBytesToBeSent;
private long bytesReceived;
private long connectionTimeMs;
private long sendRequestTimeMs;
private long recvResponseTimeMs;
private boolean shouldMask = false;
private boolean connectionDisconnectedOnError = false;
/**Request headers to be sent in the request.*/
private final List requestHeaders;
/**
* Timeout that defines maximum allowed connection establishment time for a request.
* Timeout is in milliseconds. Not all requests need to establish a new connection,
* it depends on the connection pooling-heuristic of the networking library.
*/
private final int connectionTimeout;
/**
* Timeout in milliseconds that defines maximum allowed time to read the response.
* This timeout starts once request is sent. It includes server reponse time,
* network latency, and time to read the response.
*/
private final int readTimeout;
public static AbfsHttpOperation getAbfsHttpOperationWithFixedResult(
final URL url,
final String method,
final int httpStatus) {
AbfsHttpOperationWithFixedResult httpOp
= new AbfsHttpOperationWithFixedResult(url, method, httpStatus);
return httpOp;
}
public AbfsHttpOperation(
final Logger log,
final URL url,
final String method,
final List requestHeaders,
final Duration connectionTimeout,
final Duration readTimeout) {
this.log = log;
this.url = url;
this.method = method;
this.requestHeaders = requestHeaders;
this.connectionTimeout = (int) connectionTimeout.toMillis();
this.readTimeout = (int) readTimeout.toMillis();
}
/**
* Constructor for FixedResult instance, avoiding connection init.
* @param url request url
* @param method Http method
* @param httpStatus HttpStatus
*/
protected AbfsHttpOperation(final URL url,
final String method,
final int httpStatus) {
this.log = LoggerFactory.getLogger(AbfsHttpOperation.class);
this.url = url;
this.method = method;
this.statusCode = httpStatus;
this.requestHeaders = new ArrayList<>();
this.connectionTimeout = 0;
this.readTimeout = 0;
}
int getConnectionTimeout() {
return connectionTimeout;
}
int getReadTimeout() {
return readTimeout;
}
List getRequestHeaders() {
return requestHeaders;
}
public String getMethod() {
return method;
}
public String getHost() {
return url.getHost();
}
public int getStatusCode() {
return statusCode;
}
public String getStatusDescription() {
return statusDescription;
}
public String getStorageErrorCode() {
return storageErrorCode;
}
public String getStorageErrorMessage() {
return storageErrorMessage;
}
public String getClientRequestId() {
return getRequestProperty(HttpHeaderConfigurations.X_MS_CLIENT_REQUEST_ID);
}
public String getExpectedAppendPos() {
return expectedAppendPos;
}
public String getRequestId() {
return requestId;
}
public void setMaskForSAS() {
shouldMask = true;
}
public int getBytesSent() {
return bytesSent;
}
public int getExpectedBytesToBeSent() {
return expectedBytesToBeSent;
}
public long getBytesReceived() {
return bytesReceived;
}
public URL getUrl() {
return url;
}
public ListResultSchema getListResultSchema() {
return listResultSchema;
}
/**
* Get response header value for the given headerKey.
*
* @param httpHeader header key.
* @return header value.
*/
public abstract String getResponseHeader(String httpHeader);
// Returns a trace message for the request
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append(statusCode);
sb.append(",");
sb.append(storageErrorCode);
sb.append(",");
sb.append(expectedAppendPos);
sb.append(",cid=");
sb.append(getClientRequestId());
sb.append(",rid=");
sb.append(requestId);
sb.append(",connMs=");
sb.append(connectionTimeMs);
sb.append(",sendMs=");
sb.append(sendRequestTimeMs);
sb.append(",recvMs=");
sb.append(recvResponseTimeMs);
sb.append(",sent=");
sb.append(bytesSent);
sb.append(",recv=");
sb.append(bytesReceived);
sb.append(",");
sb.append(method);
sb.append(",");
sb.append(getMaskedUrl());
return sb.toString();
}
// Returns a trace message for the ABFS API logging service to consume
public String getLogString() {
final StringBuilder sb = new StringBuilder();
sb.append("s=")
.append(statusCode)
.append(" e=")
.append(storageErrorCode)
.append(" ci=")
.append(getClientRequestId())
.append(" ri=")
.append(requestId)
.append(" ct=")
.append(connectionTimeMs)
.append(" st=")
.append(sendRequestTimeMs)
.append(" rt=")
.append(recvResponseTimeMs)
.append(" bs=")
.append(bytesSent)
.append(" br=")
.append(bytesReceived)
.append(" m=")
.append(method)
.append(" u=")
.append(getMaskedEncodedUrl());
return sb.toString();
}
@VisibleForTesting
public String getMaskedUrl() {
if (!shouldMask) {
return url.toString();
}
if (maskedUrl != null) {
return maskedUrl;
}
maskedUrl = UriUtils.getMaskedUrl(url);
return maskedUrl;
}
public final String getMaskedEncodedUrl() {
if (maskedEncodedUrl != null) {
return maskedEncodedUrl;
}
maskedEncodedUrl = UriUtils.encodedUrlStr(getMaskedUrl());
return maskedEncodedUrl;
}
/**
* Sends the HTTP request. Note that HttpUrlConnection requires that an
* empty buffer be sent in order to set the "Content-Length: 0" header, which
* is required by our endpoint.
*
* @param buffer the request entity body.
* @param offset an offset into the buffer where the data beings.
* @param length the length of the data in the buffer.
*
* @throws IOException if an error occurs.
*/
public abstract void sendPayload(byte[] buffer, int offset, int length) throws
IOException;
/**
* Gets and processes the HTTP response.
*
* @param buffer a buffer to hold the response entity body
* @param offset an offset in the buffer where the data will being.
* @param length the number of bytes to be written to the buffer.
*
* @throws IOException if an error occurs.
*/
public abstract void processResponse(byte[] buffer,
int offset,
int length) throws IOException;
/**
* Set request header.
*
* @param key header key.
* @param value header value.
*/
public abstract void setRequestProperty(String key, String value);
/**
* Parse response body from the connection.
*
* @param buffer byte array to store the response body.
* @param offset offset in the buffer.
* @param length length of the response body.
*
* @throws IOException if network error occurs while reading the response.
*/
final void parseResponse(final byte[] buffer,
final int offset,
final int length) throws IOException {
long startTime;
if (AbfsHttpConstants.HTTP_METHOD_HEAD.equals(this.method)) {
// If it is HEAD, and it is ERROR
return;
}
startTime = System.nanoTime();
if (statusCode >= HttpURLConnection.HTTP_BAD_REQUEST) {
processStorageErrorResponse();
this.recvResponseTimeMs += elapsedTimeMs(startTime);
String contentLength = getResponseHeader(
HttpHeaderConfigurations.CONTENT_LENGTH);
if (contentLength != null) {
this.bytesReceived = Long.parseLong(contentLength);
} else {
this.bytesReceived = 0L;
}
} else {
// consume the input stream to release resources
int totalBytesRead = 0;
try (InputStream stream = getContentInputStream()) {
if (isNullInputStream(stream)) {
return;
}
boolean endOfStream = false;
// this is a list operation and need to retrieve the data
// need a better solution
if (AbfsHttpConstants.HTTP_METHOD_GET.equals(this.method)
&& buffer == null) {
parseListFilesResponse(stream);
} else {
if (buffer != null) {
while (totalBytesRead < length) {
int bytesRead = stream.read(buffer, offset + totalBytesRead,
length
- totalBytesRead);
if (bytesRead == -1) {
endOfStream = true;
break;
}
totalBytesRead += bytesRead;
}
}
if (!endOfStream && stream.read() != -1) {
// read and discard
int bytesRead = 0;
byte[] b = new byte[CLEAN_UP_BUFFER_SIZE];
while ((bytesRead = stream.read(b)) >= 0) {
totalBytesRead += bytesRead;
}
}
}
} catch (IOException ex) {
log.warn("IO/Network error: {} {}: {}",
method, getMaskedUrl(), ex.getMessage());
log.debug("IO Error: ", ex);
throw ex;
} finally {
this.recvResponseTimeMs += elapsedTimeMs(startTime);
this.bytesReceived = totalBytesRead;
}
}
}
/**
* Get the response stream from the connection.
* @return InputStream: response stream from the connection after network call.
* @throws IOException if the response stream could not be created from the connection.
*/
protected abstract InputStream getContentInputStream() throws IOException;
/**
* When the request fails, this function is used to parse the responseAbfsHttpClient.LOG.debug("ExpectedError: ", ex);
* and extract the storageErrorCode and storageErrorMessage. Any errors
* encountered while attempting to process the error response are logged,
* but otherwise ignored.
*
* For storage errors, the response body *usually* has the following format:
*
* {
* "error":
* {
* "code": "string",
* "message": "string"
* }
* }
*
*/
private void processStorageErrorResponse() {
try (InputStream stream = getErrorStream()) {
if (stream == null) {
return;
}
JsonFactory jf = new JsonFactory();
try (JsonParser jp = jf.createParser(stream)) {
String fieldName, fieldValue;
jp.nextToken(); // START_OBJECT - {
jp.nextToken(); // FIELD_NAME - "error":
jp.nextToken(); // START_OBJECT - {
jp.nextToken();
while (jp.hasCurrentToken()) {
if (jp.getCurrentToken() == JsonToken.FIELD_NAME) {
fieldName = jp.getCurrentName();
jp.nextToken();
fieldValue = jp.getText();
switch (fieldName) {
case "code":
storageErrorCode = fieldValue;
break;
case "message":
storageErrorMessage = fieldValue;
break;
case "ExpectedAppendPos":
expectedAppendPos = fieldValue;
break;
default:
break;
}
}
jp.nextToken();
}
}
} catch (IOException ex) {
// Ignore errors that occur while attempting to parse the storage
// error, since the response may have been handled by the HTTP driver
// or for other reasons have an unexpected
log.debug("ExpectedError: ", ex);
}
}
/**
* Get the error stream from the connection.
* @return InputStream
* @throws IOException if the error stream could not be created from the response stream.
*/
protected abstract InputStream getErrorStream() throws IOException;
/**
* Parse the list file response
*
* @param stream InputStream contains the list results.
* @throws IOException if the response cannot be deserialized.
*/
private void parseListFilesResponse(final InputStream stream)
throws IOException {
if (stream == null) {
return;
}
if (listResultSchema != null) {
// already parse the response
return;
}
try {
final ObjectMapper objectMapper = new ObjectMapper();
this.listResultSchema = objectMapper.readValue(stream,
ListResultSchema.class);
} catch (IOException ex) {
log.error("Unable to deserialize list results", ex);
throw ex;
}
}
/**
* Returns the elapsed time in milliseconds.
*/
final long elapsedTimeMs(final long startTime) {
return (System.nanoTime() - startTime) / ONE_MILLION;
}
/**
* Check null stream, this is to pass findbugs's redundant check for NULL
* @param stream InputStream
*/
private boolean isNullInputStream(InputStream stream) {
return stream == null ? true : false;
}
/**
* Gets the connection request property for a key.
* @param key The request property key.
* @return request peoperty value.
*/
abstract String getConnProperty(String key);
/**
* Gets the connection url.
* @return url.
*/
abstract URL getConnUrl();
/**
* Gets the connection response code.
* @return response code.
* @throws IOException
*/
abstract Integer getConnResponseCode() throws IOException;
/**
* Gets the connection response message.
* @return response message.
* @throws IOException
*/
abstract String getConnResponseMessage() throws IOException;
/**
* Get request headers.
*
* @return request headers.
*/
abstract Map> getRequestProperties();
/**
* Get request header value for a header name.
*
* @param headerName header name.
* @return header value.
*/
abstract String getRequestProperty(String headerName);
boolean getConnectionDisconnectedOnError() {
return connectionDisconnectedOnError;
}
/**
* Get the suffix to add to the tracing context that defines what http-client is
* used to make the network call
* @return the suffix to distinguish http client
*/
public abstract String getTracingContextSuffix();
public final long getSendLatency() {
return sendRequestTimeMs;
}
public final long getRecvLatency() {
return recvResponseTimeMs;
}
/**
* Set response status code for the server call.
*
* @param statusCode status code.
*/
protected void setStatusCode(final int statusCode) {
this.statusCode = statusCode;
}
/**
* Sets response status description for the server call.
*
* @param statusDescription status description.
*/
protected void setStatusDescription(final String statusDescription) {
this.statusDescription = statusDescription;
}
/**
* Set x-ms-request-id value from the server call response header.
*/
protected void setRequestId() {
requestId = getResponseHeader(
HttpHeaderConfigurations.X_MS_REQUEST_ID);
if (requestId == null) {
requestId = AbfsHttpConstants.EMPTY_STRING;
}
}
/**
* Sets byteSent metric.
*
* @param bytesSent bytes sent.
*/
protected void setBytesSent(final int bytesSent) {
this.bytesSent = bytesSent;
}
/**
* Sets expected bytes to be sent.
*
* @param expectedBytesToBeSent expected bytes to be sent.
*/
protected void setExpectedBytesToBeSent(final int expectedBytesToBeSent) {
this.expectedBytesToBeSent = expectedBytesToBeSent;
}
/**
* Sets connection time in milliseconds taken to establish the connection.
*
* @param connectionTimeMs connection time in milliseconds.
*/
protected void setConnectionTimeMs(final long connectionTimeMs) {
this.connectionTimeMs = connectionTimeMs;
}
/**
* Sets send request time in milliseconds.
*
* @param sendRequestTimeMs send request time in milliseconds.
*/
protected void setSendRequestTimeMs(final long sendRequestTimeMs) {
this.sendRequestTimeMs = sendRequestTimeMs;
}
/**
* Sets receive response time in milliseconds.
*
* @param recvResponseTimeMs receive response time in milliseconds.
*/
protected void setRecvResponseTimeMs(final long recvResponseTimeMs) {
this.recvResponseTimeMs = recvResponseTimeMs;
}
/**
* Marks network error and expect100 failures for send-payload phase.
*/
protected void setConnectionDisconnectedOnError() {
this.connectionDisconnectedOnError = true;
}
/**
* @return value of {@link #connectionDisconnectedOnError}
*/
protected boolean isConnectionDisconnectedOnError() {
return connectionDisconnectedOnError;
}
public static class AbfsHttpOperationWithFixedResult extends AbfsHttpOperation {
/**
* Creates an instance to represent fixed results.
* This is used in idempotency handling.
*
* @param url The full URL including query string parameters.
* @param method The HTTP method (PUT, PATCH, POST, GET, HEAD, or DELETE).
* @param httpStatus StatusCode to hard set
*/
public AbfsHttpOperationWithFixedResult(final URL url,
final String method,
final int httpStatus) {
super(url, method, httpStatus);
}
@Override
public void processResponse(final byte[] buffer,
final int offset,
final int length)
throws IOException {
}
@Override
public void setRequestProperty(final String key, final String value) {
}
@Override
protected InputStream getContentInputStream() throws IOException {
return null;
}
@Override
protected InputStream getErrorStream() throws IOException {
return null;
}
@Override
String getConnProperty(final String key) {
return null;
}
@Override
URL getConnUrl() {
return null;
}
@Override
Integer getConnResponseCode() throws IOException {
return null;
}
@Override
String getConnResponseMessage() throws IOException {
return null;
}
@Override
Map> getRequestProperties() {
return null;
}
@Override
String getRequestProperty(final String headerName) {
return null;
}
@Override
public String getTracingContextSuffix() {
return null;
}
@Override
public String getResponseHeader(final String httpHeader) {
return "";
}
@Override
public void sendPayload(final byte[] buffer,
final int offset,
final int length)
throws IOException {
}
}
}