com.basho.riak.client.util.ClientUtils Maven / Gradle / Ivy
/*
* This file is provided 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 com.basho.riak.client.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Map.Entry;
import org.apache.commons.codec.binary.Base64;
import org.apache.http.Header;
import org.apache.http.client.HttpClient;
import org.apache.http.client.params.AllClientPNames;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONObject;
import com.basho.riak.client.RiakClient;
import com.basho.riak.client.RiakConfig;
import com.basho.riak.client.RiakLink;
import com.basho.riak.client.RiakObject;
import com.basho.riak.client.response.RiakExceptionHandler;
import com.basho.riak.client.response.RiakIORuntimeException;
/**
* Utility functions.
*
* @deprecated with the addition of a protocol buffers client in 0.14 all the
* existing REST client code should be in client.http.* this class
* has therefore been moved. Please use
* com.basho.riak.client.http.util.ClientUtils
* instead.
* WARNING: This class will be REMOVED in the next version.
* @see com.basho.riak.client.http.util.ClientUtils
*/
@Deprecated
public class ClientUtils {
// Matches the scheme, host and port of a URL
private static String URL_PATH_MASK = "^(?:[A-Za-z0-9+-\\.]+://)?[^/]*";
private static Random rng = new Random();
/**
* Construct a new {@link HttpClient} instance given a {@link RiakConfig}.
*
* @param config
* {@link RiakConfig} containing HttpClient configuration
* specifics.
* @return A new {@link HttpClient}
*/
public static HttpClient newHttpClient(RiakConfig config) {
HttpClient http = config.getHttpClient();
ClientConnectionManager m;
if (http == null) {
m = new ThreadSafeClientConnManager();
if (config.getMaxConnections() != null) {
((ThreadSafeClientConnManager) m).setMaxTotal(config.getMaxConnections());
((ThreadSafeClientConnManager) m).setDefaultMaxPerRoute(config.getMaxConnections());
}
http = new DefaultHttpClient(m);
if (config.getRetryHandler() != null) {
((DefaultHttpClient) http).setHttpRequestRetryHandler(config.getRetryHandler());
}
} else {
m = http.getConnectionManager();
}
HttpParams cp = http.getParams();
if (config.getTimeout() != null) {
cp.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, config.getTimeout());
cp.setIntParameter(AllClientPNames.SO_TIMEOUT, config.getTimeout());
}
return http;
}
/**
* Return a URL to the given bucket
*
* @param config
* RiakConfig containing the base URL to Riak
* @param bucket
* Bucket whose URL to retrieving
* @return URL to the bucket
*/
public static String makeURI(RiakConfig config, String bucket) {
return config.getUrl() + "/" + urlEncode(bucket);
}
/**
* Return a URL to the given object
*
* @param config
* RiakConfig containing the base URL to Riak
* @param bucket
* Bucket of the object
* @param key
* Key of the object
* @return URL to the object
*/
public static String makeURI(RiakConfig config, String bucket, String key) {
if (key == null)
return makeURI(config, bucket);
return makeURI(config, bucket) + "/" + urlEncode(key);
}
/**
* Return a URL to the given object
*
* @param config
* RiakConfig containing the base URL to Riak
* @param bucket
* Bucket of the object
* @param key
* Key of the object
* @param extra
* Extra path information beyond the bucket and key (e.g. for
* link walking or query parameters)
* @return URL to the object
*/
public static String makeURI(RiakConfig config, String bucket, String key, String extra) {
if (extra == null)
return makeURI(config, bucket, key);
if (!extra.startsWith("?") && !extra.startsWith("/")) {
extra = "/" + extra;
}
return makeURI(config, bucket, key) + extra;
}
/**
* Return just the path portion of the given URL
*/
public static String getPathFromUrl(String url) {
if (url == null)
return null;
return url.replaceFirst(URL_PATH_MASK, "");
}
/**
* UTF-8 encode the string
*/
public static String urlEncode(String s) {
try {
return URLEncoder.encode(s, "UTF-8");
} catch (UnsupportedEncodingException unreached) {
// UTF-8 must be supported by every Java implementation:
// http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html
throw new IllegalStateException("UTF-8 must be supported", unreached);
}
}
/**
* Decodes a UTF-8 encoded string
*/
public static String urlDecode(String s) {
try {
return URLDecoder.decode(s, "UTF-8");
} catch (UnsupportedEncodingException unreached) {
throw new IllegalStateException("UTF-8 must be supported", unreached);
}
}
/**
* Base64 encodes the first 4 bytes of clientId into a value acceptable for
* the X-Riak-ClientId header.
*/
public static String encodeClientId(byte[] clientId) {
if (clientId == null || clientId.length < 4)
throw new IllegalArgumentException("ClientId must be at least 4 bytes");
try {
return new String(Base64.encodeBase64(new byte[] { clientId[0], clientId[1], clientId[2], clientId[3] }), "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException("UTF-8 support is required by JVM");
}
}
public static String encodeClientId(String clientId) {
return encodeClientId(CharsetUtils.asBytes(clientId, CharsetUtils.ISO_8859_1));
}
/**
* Returns a random X-Riak-ClientId header value.
*/
public static String randomClientId() {
byte[] rnd = new byte[4];
rng.nextBytes(rnd);
return encodeClientId(rnd);
}
/**
* Unquote and unescape an HTTP quoted-string:
*
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2
*
* Does nothing if s is not quoted.
*
* @param s
* quoted-string to unquote
* @return s with quotes and backslash-escaped characters unescaped
*/
public static String unquoteString(String s) {
if (s.startsWith("\"") && s.endsWith("\"")) {
s = s.substring(1, s.length() - 1);
}
return s.replaceAll("\\\\(.)", "$1");
}
/**
* Convert a header array returned from {@link HttpClient} to a map
*
* @param headers
* Header array returned from HttpClient
* @return Map of the header names to values
*/
public static Map asHeaderMap(Header[] headers) {
Map m = new HashMap();
if (headers != null) {
for (Header header : headers) {
m.put(header.getName().toLowerCase(), header.getValue());
}
}
return m;
}
/**
* Convert a {@link JSONObject} to a map
*
* @param json
* {@link JSONObject} to convert
* @return Map of the field names to string representations of the values
*/
@SuppressWarnings("rawtypes") public static Map jsonObjectAsMap(JSONObject json) {
if (json == null)
return null;
Map m = new HashMap();
for (Iterator iter = json.keys(); iter.hasNext();) {
Object obj = iter.next();
if (obj != null) {
String key = obj.toString();
m.put(key, json.optString(key));
}
}
return m;
}
/**
* Convert a {@link JSONArray} to a list
*
* @param json
* {@link JSONArray} to convert
* @return List of string representations of the elements
*/
public static List jsonArrayAsList(JSONArray json) {
if (json == null)
return null;
List l = new ArrayList();
for (int i = 0; i < json.length(); i++) {
l.add(json.optString(i));
}
return l;
}
/**
* Join the elements in arr in to a single string separated by delimiter.
*/
public static String join(String[] arr, String delimiter) {
StringBuffer buf = new StringBuffer();
if (arr == null || arr.length == 0)
return null;
buf.append(arr[0]);
for (int i = 1; i < arr.length; i++) {
buf.append(delimiter);
buf.append(arr[i]);
}
return buf.toString();
}
/**
* Copies data from an {@link InputStream} to an {@link OutputStream} in
* blocks
*
* @param in
* InputStream to copy
* @param out
* OutputStream to copy to
* @throws IOException
*/
public static void copyStream(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
while (true) {
final int readCount = in.read(buffer);
if (readCount == -1) {
break;
}
out.write(buffer, 0, readCount);
}
}
/**
* Parse a link header into a {@link RiakLink}. See {@link LinkHeader}.
*
* @param header
* The HTTP Link header value.
* @return List of {@link RiakLink} objects constructed from the links in
* header in order.
*/
public static List parseLinkHeader(String header) {
List links = new ArrayList();
Map> parsedLinks = LinkHeader.parse(header);
for (Entry> e: parsedLinks.entrySet()) {
String url = e.getKey();
RiakLink link = parseOneLink(url, e.getValue());
if (link != null) {
links.add(link);
}
}
return links;
}
/**
* Create a {@link RiakLink} object from a single parsed link from the Link
* header
*
* @param url
* The link URL
* @param params
* The link parameters
* @return {@link RiakLink} object
*/
private static RiakLink parseOneLink(String url, Map params) {
String tag = params.get(Constants.LINK_TAG);
if (tag != null) {
String[] parts = url.split("/");
if (parts.length >= 2)
return new RiakLink(parts[parts.length - 2], parts[parts.length - 1], tag);
}
return null;
}
/**
* Extract only the user-specified metadata headers from a header set: all
* headers prefixed with X-Riak-Meta-. The prefix is removed before
* returning.
*
* @param headers
* The full HTTP header set from the response
* @return Map of all headers prefixed with X-Riak-Meta- with prefix
* removed.
*/
public static Map parseUsermeta(Map headers) {
Map usermeta = new HashMap();
if (headers != null) {
for (Entry e : headers.entrySet()) {
String header = e.getKey();
if (header != null && header.toLowerCase().startsWith(Constants.HDR_USERMETA_PREFIX)) {
usermeta.put(header.substring(Constants.HDR_USERMETA_PREFIX.length()), e.getValue());
}
}
}
return usermeta;
}
/**
* Convert a multipart/mixed document to a list of {@link RiakObject}s.
*
* @param riak
* {@link RiakClient} this object should be associate with, or
* null if none
* @param bucket
* original object's bucket
* @param key
* original object's key
* @param docHeaders
* original document's headers
* @param docBody
* original document's body
* @return List of {@link RiakObject}s represented by the multipart document
*/
public static List parseMultipart(RiakClient riak, String bucket, String key,
Map docHeaders, byte[] docBody) {
String vclock = null;
boolean siblingVclock = false;
if (docHeaders != null) {
vclock = docHeaders.get(Constants.HDR_VCLOCK);
if( vclock != null) {
siblingVclock = true;
}
}
List parts = Multipart.parse(docHeaders, docBody);
List objects = new ArrayList();
if (parts != null) {
for (Multipart.Part part : parts) {
Map headers = part.getHeaders();
// handles the case of link walk multi part responses where the vclock header is in the part not the top response
if (!siblingVclock) {
vclock = headers.get(Constants.HDR_VCLOCK);
}
if(vclock == null) {
// this should never happen
// exception here to shorten path from bug occurrence
// to bug manifestation
throw new IllegalStateException("no vclock found");
}
List links = parseLinkHeader(headers.get(Constants.HDR_LINK));
Map usermeta = parseUsermeta(headers);
String location = headers.get(Constants.HDR_LOCATION);
String partBucket = bucket;
String partKey = key;
if (location != null) {
String[] locationParts = location.split("/");
if (locationParts.length >= 2) {
partBucket = locationParts[locationParts.length - 2];
partKey = locationParts[locationParts.length - 1];
}
}
RiakObject o = new RiakObject(riak, partBucket, partKey, part.getBody(),
headers.get(Constants.HDR_CONTENT_TYPE), links, usermeta, vclock,
headers.get(Constants.HDR_LAST_MODIFIED), headers.get(Constants.HDR_ETAG));
objects.add(o);
}
}
return objects;
}
/**
* Throws a checked {@link Exception} not declared in the method signature,
* which can be particularly useful for throwing checked exceptions within a
* {@link RiakExceptionHandler}. Clearly, this circumvents compiler
* safeguards, so use with caution. You've been warned.
*
* @param exception
* A checked (or unchecked) exception to be thrown.
*/
public static void throwChecked(final Throwable exception) {
new CheckedThrower().throwChecked(exception);
}
/**
* Buffers an input stream into a byte array
* @param valueStream the stream to read into an array
* @return the byte array of the consumed stream
*/
public static byte[] bufferStream(InputStream valueStream) {
if (valueStream == null) {
return new byte[] {};
}
try {
ByteArrayOutputStream tmp = new ByteArrayOutputStream();
byte[] data = new byte[4096];
int l = 0;
while ((l = valueStream.read(data)) >= 0) {
tmp.write(data, 0, l);
}
return tmp.toByteArray();
} catch (IOException e) {
throw new RiakIORuntimeException(e);
}
}
}
class CheckedThrower {
@SuppressWarnings("unchecked") public void throwChecked(Throwable exception) throws T {
throw (T) exception;
}
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