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EmbraceUrlConnectionDelegate.java
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EmbraceUrlConnectionDelegate.java
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package io.embrace.android.embracesdk.internal.network.http;
import static io.embrace.android.embracesdk.config.behavior.NetworkSpanForwardingBehavior.TRACEPARENT_HEADER_NAME;
import android.annotation.TargetApi;
import android.os.Build;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;
import java.security.Permission;
import java.security.Principal;
import java.security.cert.Certificate;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.zip.GZIPInputStream;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSocketFactory;
import io.embrace.android.embracesdk.Embrace;
import io.embrace.android.embracesdk.annotation.InternalApi;
import io.embrace.android.embracesdk.network.EmbraceNetworkRequest;
import io.embrace.android.embracesdk.network.http.HttpMethod;
import io.embrace.android.embracesdk.utils.exceptions.function.CheckedSupplier;
import kotlin.jvm.functions.Function0;
/**
* Wraps {@link HttpURLConnection} to log network calls to Embrace. The wrapper also wraps the
* InputStream to get an accurate count of bytes received if a Content-Length is not provided by
* the server.
* <p>
* The wrapper handles gzip decompression itself and strips the {@code Content-Length} and
* {@code Content-Encoding} headers. Typically this is handled transparently by
* {@link HttpURLConnection} but would prevent us from accessing the {@code Content-Length}.
* <p>
* Network logging currently does not follow redirects. The duration is logged from initiation of
* the network call (upon invocation of any method which would initiate the network call), to the
* retrieval of the response.
* <p>
* As network calls are initiated lazily, we log the network call prior to the calling of any
* wrapped method which would result in the network call actually being executed, and store a
* flag to prevent duplication of calls.
*/
@InternalApi
class EmbraceUrlConnectionDelegate<T extends HttpURLConnection> implements EmbraceHttpsUrlConnection {
/**
* The content encoding HTTP header.
*/
static final String CONTENT_ENCODING = "Content-Encoding";
/**
* The content length HTTP header.
*/
static final String CONTENT_LENGTH = "Content-Length";
/**
* Reference to the wrapped connection.
*/
private final T connection;
/**
* The time at which the connection was created.
*/
private final long createdTime;
/**
* Whether transparent gzip compression is enabled.
*/
private final boolean enableWrapIoStreams;
/**
* Reference to the SDK that is mockable and fakeable in tests
*/
private final Embrace embrace;
/**
* A reference to the output stream wrapped in a counter, so we can determine the bytes sent.
*/
private volatile CountingOutputStream outputStream;
/**
* Whether the network call has already been logged, to prevent duplication.
*/
private volatile boolean didLogNetworkCall = false;
/**
* The time at which the network call was initiated.
*/
private volatile Long startTime;
/**
* The trace id specified for the request
*/
private volatile String traceId;
/**
* The request headers captured from the http connection.
*/
private volatile HashMap<String, String> requestHeaders;
/**
* Indicates if the request throws a IOException
*/
private volatile Exception inputStreamAccessException;
private volatile Exception lastConnectionAccessException;
private final AtomicLong responseSize = new AtomicLong(-1);
private final AtomicInteger responseCode = new AtomicInteger(0);
private final AtomicReference<Map<String, List<String>>> headerFields = new AtomicReference<>(null);
private final AtomicReference<NetworkCaptureData> networkCaptureData = new AtomicReference<>(null);
@Nullable
private volatile String traceparent = null;
private final boolean isSDKStarted;
/**
* Wraps an existing {@link HttpURLConnection} with the Embrace network logic.
*
* @param connection the connection to wrap
* @param enableWrapIoStreams true if we should transparently ungzip the response, else false
*/
public EmbraceUrlConnectionDelegate(@NonNull T connection, boolean enableWrapIoStreams) {
this(connection, enableWrapIoStreams, Embrace.getInstance());
}
EmbraceUrlConnectionDelegate(@NonNull T connection, boolean enableWrapIoStreams,
@NonNull Embrace embrace) {
this.connection = connection;
this.enableWrapIoStreams = enableWrapIoStreams;
this.embrace = embrace;
this.createdTime = embrace.getInternalInterface().getSdkCurrentTime();
this.isSDKStarted = embrace.isStarted();
}
@Override
public void addRequestProperty(@NonNull String key, @Nullable String value) {
this.connection.addRequestProperty(key, value);
}
@Override
public void connect() throws IOException {
if (isSDKStarted) {
identifyTraceId();
try {
if (embrace.getInternalInterface().isNetworkSpanForwardingEnabled()) {
traceparent = connection.getRequestProperty(TRACEPARENT_HEADER_NAME);
}
} catch (Exception e) {
// Ignore traceparent if there was a problem obtaining it
}
}
this.connection.connect();
}
@Override
public void disconnect() {
// The network call must be logged before we close the transport
setStartTime(createdTime);
internalLogNetworkCall();
this.connection.disconnect();
}
@Override
public boolean getAllowUserInteraction() {
return this.connection.getAllowUserInteraction();
}
@Override
public void setAllowUserInteraction(boolean allowUserInteraction) {
this.connection.setAllowUserInteraction(allowUserInteraction);
}
@Override
public int getConnectTimeout() {
return this.connection.getConnectTimeout();
}
@Override
public void setConnectTimeout(int timeout) {
this.connection.setConnectTimeout(timeout);
}
@Override
@Nullable
public Object getContent() throws IOException {
identifyTraceId();
return this.connection.getContent();
}
@Override
@Nullable
public Object getContent(@NonNull Class<?>[] classes) throws IOException {
identifyTraceId();
return this.connection.getContent(classes);
}
@Override
@Nullable
public String getContentEncoding() {
return shouldUncompressGzip() ? null : this.connection.getContentEncoding();
}
@Override
public int getContentLength() {
return shouldUncompressGzip() ? -1 : this.connection.getContentLength();
}
@Override
@TargetApi(24)
public long getContentLengthLong() {
return (shouldUncompressGzip() || Build.VERSION.SDK_INT < Build.VERSION_CODES.N) ?
-1 : this.connection.getContentLengthLong();
}
@Override
@Nullable
public String getContentType() {
return this.connection.getContentType();
}
@Override
public long getDate() {
return this.connection.getDate();
}
@Override
public boolean getDefaultUseCaches() {
return this.connection.getDefaultUseCaches();
}
@Override
public void setDefaultUseCaches(boolean defaultUseCaches) {
this.connection.setDefaultUseCaches(defaultUseCaches);
}
@Override
public boolean getDoInput() {
return this.connection.getDoInput();
}
@Override
public void setDoInput(boolean doInput) {
this.connection.setDoInput(doInput);
}
@Override
public boolean getDoOutput() {
return this.connection.getDoOutput();
}
@Override
public void setDoOutput(boolean doOutput) {
this.connection.setDoOutput(doOutput);
}
@Override
@Nullable
public InputStream getErrorStream() {
return getWrappedInputStream(this.connection.getErrorStream());
}
private boolean shouldInterceptHeaderRetrieval(@Nullable String key) {
return shouldUncompressGzip() && key != null && (key.equalsIgnoreCase(CONTENT_ENCODING) || key.equalsIgnoreCase(CONTENT_LENGTH));
}
@Override
@Nullable
public String getHeaderField(int n) {
String key = this.connection.getHeaderFieldKey(n);
return retrieveHeaderField(key,
null,
() -> connection.getHeaderField(n)
);
}
@Override
@Nullable
public String getHeaderField(@Nullable String name) {
return retrieveHeaderField(name,
null,
() -> connection.getHeaderField(name)
);
}
@Override
@Nullable
public String getHeaderFieldKey(int n) {
String key = this.connection.getHeaderFieldKey(n);
return retrieveHeaderField(key,
null,
() -> key
);
}
@Override
public long getHeaderFieldDate(@NonNull String name, long defaultValue) {
Long result = retrieveHeaderField(name,
defaultValue,
() -> connection.getHeaderFieldDate(name, defaultValue)
);
return result != null ? result : defaultValue;
}
@Override
public int getHeaderFieldInt(@NonNull String name, int defaultValue) {
Integer result = retrieveHeaderField(name,
defaultValue,
() -> connection.getHeaderFieldInt(name, defaultValue)
);
return result != null ? result : defaultValue;
}
@Override
@TargetApi(24)
public long getHeaderFieldLong(@NonNull String name, long defaultValue) {
Long result = retrieveHeaderField(name,
defaultValue,
() -> Build.VERSION.SDK_INT < Build.VERSION_CODES.N ? -1 :
this.connection.getHeaderFieldLong(name, defaultValue)
);
return result != null ? result : defaultValue;
}
@Override
@Nullable
public Map<String, List<String>> getHeaderFields() {
cacheNetworkCallData();
return headerFields.get();
}
private <R> R retrieveHeaderField(@Nullable String name,
R defaultValue,
Function0<R> action) {
if (name == null) {
return null;
}
if (shouldInterceptHeaderRetrieval(name)) {
// Strip the content encoding and length headers, as we transparently ungzip the content
return defaultValue;
}
R result = action.invoke();
cacheNetworkCallData();
return result;
}
@Override
public long getIfModifiedSince() {
return this.connection.getIfModifiedSince();
}
@Override
public void setIfModifiedSince(long ifModifiedSince) {
this.connection.setIfModifiedSince(ifModifiedSince);
}
@Override
@Nullable
public InputStream getInputStream() throws IOException {
try {
return getWrappedInputStream(this.connection.getInputStream());
} catch (IOException e) {
inputStreamAccessException = e;
throw e;
}
}
@Override
public boolean getInstanceFollowRedirects() {
return this.connection.getInstanceFollowRedirects();
}
@Override
public void setInstanceFollowRedirects(boolean followRedirects) {
this.connection.setInstanceFollowRedirects(followRedirects);
}
@Override
public long getLastModified() {
return this.connection.getLastModified();
}
@Override
@Nullable
public OutputStream getOutputStream() throws IOException {
identifyTraceId();
OutputStream out = connection.getOutputStream();
if (enableWrapIoStreams && this.outputStream == null && out != null) {
this.outputStream = new CountingOutputStream(out);
return this.outputStream;
}
return out;
}
@Override
@Nullable
public Permission getPermission() throws IOException {
return this.connection.getPermission();
}
@Override
public int getReadTimeout() {
return this.connection.getReadTimeout();
}
@Override
public void setReadTimeout(int timeout) {
this.connection.setReadTimeout(timeout);
}
@Override
@NonNull
public String getRequestMethod() {
return this.connection.getRequestMethod();
}
@Override
public void setRequestMethod(@NonNull String method) throws ProtocolException {
this.connection.setRequestMethod(method);
}
@Override
@Nullable
public Map<String, List<String>> getRequestProperties() {
return this.connection.getRequestProperties();
}
@Override
@Nullable
public String getRequestProperty(@NonNull String key) {
return this.connection.getRequestProperty(key);
}
@Override
public int getResponseCode() {
identifyTraceId();
cacheNetworkCallData();
return responseCode.get();
}
@Override
@Nullable
public String getResponseMessage() throws IOException {
identifyTraceId();
cacheNetworkCallData();
return this.connection.getResponseMessage();
}
@Override
@Nullable
public URL getUrl() {
return this.connection.getURL();
}
@Override
public boolean getUseCaches() {
return this.connection.getUseCaches();
}
@Override
public void setUseCaches(boolean useCaches) {
this.connection.setUseCaches(useCaches);
}
@Override
public void setChunkedStreamingMode(int chunkLen) {
this.connection.setChunkedStreamingMode(chunkLen);
}
@Override
public void setFixedLengthStreamingMode(int contentLength) {
this.connection.setFixedLengthStreamingMode(contentLength);
}
@Override
public void setFixedLengthStreamingMode(long contentLength) {
this.connection.setFixedLengthStreamingMode(contentLength);
}
@Override
public void setRequestProperty(@NonNull String key, @Nullable String value) {
this.connection.setRequestProperty(key, value);
if (hasNetworkCaptureRules()) {
this.requestHeaders = getProcessedHeaders(getRequestProperties());
}
}
@Override
@NonNull
public String toString() {
return this.connection.toString();
}
@Override
public boolean usingProxy() {
return this.connection.usingProxy();
}
/**
* Given a start time and end time (in milliseconds), logs the network call to Embrace.
* <p>
* If this delegate has already logged the call it represents, this method is a no-op.
*/
synchronized void internalLogNetworkCall() {
if (isSDKStarted && !this.didLogNetworkCall) {
// We are proactive with setting this flag so that we don't get nested calls to log the network call by virtue of
// extracting the data we need to log the network call.
this.didLogNetworkCall = true; // TODO: Wouldn't this mean that the network call might not be logged
long endTime = embrace.getInternalInterface().getSdkCurrentTime();
String url = EmbraceHttpPathOverride.getURLString(new EmbraceHttpUrlConnectionOverride(this.connection));
try {
long bytesOut = this.outputStream == null ? 0 : Math.max(this.outputStream.getCount(), 0);
long contentLength = Math.max(0, responseSize.get());
if (inputStreamAccessException == null && lastConnectionAccessException == null && responseCode.get() != 0) {
embrace.getInternalInterface().recordNetworkRequest(
EmbraceNetworkRequest.fromCompletedRequest(
url,
HttpMethod.fromString(getRequestMethod()),
startTime,
endTime,
bytesOut,
contentLength,
responseCode.get(),
traceId,
traceparent,
networkCaptureData.get()
)
);
} else {
String exceptionClass = null;
String exceptionMessage = null;
// Error that happened when trying to obtain the input stream take precedent over connection access errors after that
if (inputStreamAccessException != null) {
exceptionClass = inputStreamAccessException.getClass().getCanonicalName();
exceptionMessage = inputStreamAccessException.getMessage();
} else if (lastConnectionAccessException != null) {
exceptionClass = lastConnectionAccessException.getClass().getCanonicalName();
exceptionMessage = lastConnectionAccessException.getMessage();
}
String errorType = exceptionClass != null ? exceptionClass : "UnknownState";
String errorMessage = exceptionMessage != null ? exceptionMessage : "HTTP response state unknown";
embrace.getInternalInterface().recordNetworkRequest(
EmbraceNetworkRequest.fromIncompleteRequest(
url,
HttpMethod.fromString(getRequestMethod()),
startTime,
endTime,
errorType,
errorMessage,
traceId,
traceparent,
networkCaptureData.get()
)
);
}
} catch (Exception e) {
logError(e);
}
}
}
@Nullable
private HashMap<String, String> getProcessedHeaders(@Nullable Map<String, List<String>> properties) {
if (properties == null) {
return null;
}
HashMap<String, String> headers = new HashMap<>();
for (Map.Entry<String, List<String>> h : properties.entrySet()) {
StringBuilder builder = new StringBuilder();
for (String value : h.getValue()) {
if (value != null) {
builder.append(value);
}
}
headers.put(h.getKey(), builder.toString());
}
return headers;
}
/**
* Wraps an input stream with an input stream which counts the number of bytes read, and then
* updates the network call service with the correct number of bytes read once the stream has
* reached the end.
*
* @param inputStream the input stream to count
* @return the wrapped input stream
*/
private CountingInputStreamWithCallback countingInputStream(InputStream inputStream) {
return new CountingInputStreamWithCallback(
inputStream,
hasNetworkCaptureRules(),
(responseBody) -> {
cacheNetworkCallData(responseBody);
internalLogNetworkCall();
return null;
});
}
/**
* We disable the automatic gzip decompression behavior of {@link HttpURLConnection} in the
* {@link EmbraceHttpUrlStreamHandler} to ensure that we can count the bytes in the response
* from the server. We decompress the response transparently to the user only if both:
* <ul>
* <li>The user did not specify an encoding</li>
* <li>The server returned a gzipped response</li>
* </ul>
* <p>
* If the user specified an encoding, even if it is gzip, we do not transparently decompress
* the response. This is to mirror the behavior of {@link HttpURLConnection} whilst providing
* us access to the content length.
*
* @return true if we should decompress the response, false otherwise
* @see <a href="https://developer.android.com/reference/java/net/HttpURLConnection#performance">Android Docs</a>
* @see <a href="https://android.googlesource.com/platform/external/okhttp/+/master/okhttp/src/main/java/com/squareup/okhttp/internal/http/HttpEngine.java">Android Source Code</a>
*/
private boolean shouldUncompressGzip() {
String contentEncoding = this.connection.getContentEncoding();
return enableWrapIoStreams &&
contentEncoding != null &&
contentEncoding.equalsIgnoreCase("gzip");
}
private void identifyTraceId() {
if (isSDKStarted && traceId == null) {
try {
traceId = getRequestProperty(embrace.getTraceIdHeader());
} catch (Exception e) {
// don't do anything
}
}
}
@Override
@Nullable
public String getCipherSuite() {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getCipherSuite();
}
return null;
}
@Override
@Nullable
public Certificate[] getLocalCertificates() {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getLocalCertificates();
}
return new Certificate[0];
}
@Override
@Nullable
public Certificate[] getServerCertificates() throws SSLPeerUnverifiedException {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getServerCertificates();
}
return new Certificate[0];
}
@Override
@Nullable
public SSLSocketFactory getSslSocketFactory() {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getSSLSocketFactory();
}
return null;
}
@Override
public void setSslSocketFactory(@NonNull SSLSocketFactory factory) {
if (this.connection instanceof HttpsURLConnection) {
((HttpsURLConnection) this.connection).setSSLSocketFactory(factory);
}
}
@Override
@Nullable
public HostnameVerifier getHostnameVerifier() {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getHostnameVerifier();
}
return null;
}
@Override
public void setHostnameVerifier(@NonNull HostnameVerifier verifier) {
if (this.connection instanceof HttpsURLConnection) {
((HttpsURLConnection) this.connection).setHostnameVerifier(verifier);
}
}
@Override
@Nullable
public Principal getLocalPrincipal() {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getLocalPrincipal();
}
return null;
}
@Override
@Nullable
public Principal getPeerPrincipal() throws SSLPeerUnverifiedException {
if (this.connection instanceof HttpsURLConnection) {
return ((HttpsURLConnection) this.connection).getPeerPrincipal();
}
return null;
}
@Nullable
private InputStream getWrappedInputStream(InputStream connectionInputStream) {
identifyTraceId();
setStartTime(embrace.getInternalInterface().getSdkCurrentTime());
InputStream in = null;
if (shouldUncompressGzip()) {
try {
CheckedSupplier<GZIPInputStream> gzipInputStreamSupplier = () -> new GZIPInputStream(connectionInputStream);
in = countingInputStream(new BufferedInputStream(gzipInputStreamSupplier.get()));
} catch (Throwable t) {
// This handles the case where it's availability is 0, causing the GZIPInputStream instantiation to fail.
}
}
if (in == null) {
in = enableWrapIoStreams ?
countingInputStream(new BufferedInputStream(connectionInputStream)) : connectionInputStream;
}
cacheNetworkCallData();
return in;
}
private boolean hasNetworkCaptureRules() {
if (!isSDKStarted || this.connection.getURL() == null) {
return false;
}
String url = this.connection.getURL().toString();
String method = this.connection.getRequestMethod();
return embrace.getInternalInterface().shouldCaptureNetworkBody(url, method);
}
private void cacheNetworkCallData() {
cacheNetworkCallData(null);
}
/**
* Cache values from response at the first point of availability so that we won't try to retrieve these values when the response
* is not available.
*/
private void cacheNetworkCallData(@Nullable byte[] responseBody) {
if (!isSDKStarted) {
return;
}
setStartTime(embrace.getInternalInterface().getSdkCurrentTime());
if (headerFields.get() == null) {
synchronized (headerFields) {
if (headerFields.get() == null) {
try {
final Map<String, List<String>> responseHeaders;
if (!enableWrapIoStreams) {
responseHeaders = connection.getHeaderFields();
} else {
responseHeaders = new HashMap<>(connection.getHeaderFields());
responseHeaders.remove(CONTENT_ENCODING);
responseHeaders.remove(CONTENT_LENGTH);
}
headerFields.set(responseHeaders);
} catch (Exception e) {
lastConnectionAccessException = e;
}
}
}
}
if (responseCode.get() == 0) {
synchronized (responseCode) {
if (responseCode.get() == 0) {
try {
responseCode.set(connection.getResponseCode());
} catch (Exception e) {
lastConnectionAccessException = e;
}
}
}
}
if (responseSize.get() == -1) {
synchronized (responseSize) {
// Only try to retrieve the response size if the connection is connected.
// Doing so when the connection is finished and has disconnected will result in the re-execution of the request
if (responseSize.get() == -1) {
try {
responseSize.set(connection.getContentLength());
} catch (Exception e) {
lastConnectionAccessException = e;
}
}
}
}
if (!enableWrapIoStreams) {
internalLogNetworkCall();
}
if (shouldCaptureNetworkData()) {
// If we don't have network capture rules, it's unnecessary to save these values
synchronized (networkCaptureData) {
if (shouldCaptureNetworkData()) {
try {
NetworkCaptureData existingData = networkCaptureData.get();
if (existingData == null) {
Map<String, String> requestHeaders = this.requestHeaders;
String requestQueryParams = connection.getURL().getQuery();
byte[] requestBody = this.outputStream != null ? this.outputStream.getRequestBody() : null;
Map<String, String> responseHeaders = getProcessedHeaders(headerFields.get());
networkCaptureData.set(
new NetworkCaptureData(
requestHeaders,
requestQueryParams,
requestBody,
responseHeaders,
responseBody,
null
)
);
} else if (responseBody != null) {
// Update the response body field in the cached networkCaptureData object if a subsequent call
// is update to update the network logging with this data.
networkCaptureData.set(
new NetworkCaptureData(
existingData.getRequestHeaders(),
existingData.getRequestQueryParams(),
existingData.getCapturedRequestBody(),
existingData.getResponseHeaders(),
responseBody,
null
)
);
}
} catch (Exception e) {
lastConnectionAccessException = e;
}
}
}
}
}
private boolean shouldCaptureNetworkData() {
return (hasNetworkCaptureRules() && (enableWrapIoStreams || inputStreamAccessException != null)) &&
(networkCaptureData.get() == null || networkCaptureData.get().getCapturedResponseBody() == null);
}
private void setStartTime(@NonNull Long startTimeMs) {
if (startTime == null) {
startTime = startTimeMs;
}
}
private void logError(@NonNull Throwable t) {
Embrace.getInstance().getInternalInterface().logInternalError(t);
}
}