/**
* Called by transport implementations when they receive headers.
*
* @param headers the parsed headers
*/
protected void inboundHeadersReceived(Metadata headers) {
if (headers.containsKey(GrpcUtil.MESSAGE_ENCODING_KEY)) {
String messageEncoding = headers.get(GrpcUtil.MESSAGE_ENCODING_KEY);
try {
setDecompressor(messageEncoding);
} catch (IllegalArgumentException e) {
Status status =
Status.INVALID_ARGUMENT
.withDescription("Unable to decompress encoding " + messageEncoding)
.withCause(e);
abortStream(status, true);
return;
}
}
// This checks to see if the client will accept any encoding. If so, a compressor is picked for
// the stream, and the decision is recorded. When the Server Call Handler writes the first
// headers, the negotiated encoding will be added in #writeHeaders(). It is safe to call
// pickCompressor multiple times before the headers have been written to the wire, though in
// practice this should never happen. There should only be one call to inboundHeadersReceived.
// Alternatively, compression could be negotiated after the server handler is invoked, but that
// would mean the inbound header would have to be stored until the first #writeHeaders call.
if (headers.containsKey(GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY)) {
Compressor c =
pickCompressor(
ACCEPT_ENCODING_SPLITER.split(headers.get(GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY)));
if (c != null) {
messageEncoding = c.getMessageEncoding();
}
}
inboundPhase(Phase.MESSAGE);
}
@VisibleForTesting
static void prepareHeaders(
Metadata headers,
CallOptions callOptions,
String userAgent,
DecompressorRegistry decompressorRegistry,
Compressor compressor) {
// Fill out the User-Agent header.
headers.removeAll(USER_AGENT_KEY);
if (userAgent != null) {
headers.put(USER_AGENT_KEY, userAgent);
}
headers.removeAll(MESSAGE_ENCODING_KEY);
if (compressor != Codec.Identity.NONE) {
headers.put(MESSAGE_ENCODING_KEY, compressor.getMessageEncoding());
}
headers.removeAll(MESSAGE_ACCEPT_ENCODING_KEY);
if (!decompressorRegistry.getAdvertisedMessageEncodings().isEmpty()) {
String acceptEncoding =
ACCEPT_ENCODING_JOINER.join(decompressorRegistry.getAdvertisedMessageEncodings());
headers.put(MESSAGE_ACCEPT_ENCODING_KEY, acceptEncoding);
}
}
private void writeCompressed(InputStream message) throws IOException {
BufferChainOutputStream bufferChain = new BufferChainOutputStream();
// Why this doesn't use getKnownLength() idk, but let's just roll with it.
int messageLength = -1;
if (message instanceof KnownLength) {
messageLength = message.available();
}
OutputStream compressingStream = compressor.compress(bufferChain);
try {
long written = writeToOutputStream(message, compressingStream);
if (messageLength != -1 && messageLength != written) {
throw new RuntimeException("Message length was inaccurate");
}
} finally {
compressingStream.close();
}
writeBufferChain(bufferChain, true);
}