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Merge pull request #121 from stanley-cheung/master
Implement the grpc-web protocol
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /** | ||
| * @fileoverview gRPC browser client library. | ||
| * | ||
| * Base class for gRPC Web JS clients using the application/grpc-web wire | ||
| * format | ||
| * | ||
| * @author [email protected] (Stanley Cheung) | ||
| */ | ||
| goog.provide('grpc.web.GrpcWebClientBase'); | ||
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| goog.require('goog.crypt.base64'); | ||
| goog.require('goog.net.XhrIo'); | ||
| goog.require('grpc.web.AbstractClientBase'); | ||
| goog.require('grpc.web.GrpcWebClientReadableStream'); | ||
| goog.require('grpc.web.StatusCode'); | ||
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| /** | ||
| * Base class for gRPC web client using the application/grpc-web wire format | ||
| * @param {?Object=} opt_options | ||
| * @constructor | ||
| * @implements {grpc.web.AbstractClientBase} | ||
| */ | ||
| grpc.web.GrpcWebClientBase = function(opt_options) { | ||
| }; | ||
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| /** | ||
| * @override | ||
| */ | ||
| grpc.web.GrpcWebClientBase.prototype.rpcCall = function( | ||
| method, request, metadata, methodInfo, callback) { | ||
| var xhr = this.newXhr_(); | ||
| var serialized = methodInfo.requestSerializeFn(request); | ||
| xhr.headers.addAll(metadata); | ||
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| var stream = new grpc.web.GrpcWebClientReadableStream(xhr); | ||
| stream.setResponseDeserializeFn(methodInfo.responseDeserializeFn); | ||
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| stream.on('data', function(response) { | ||
| callback(null, response); | ||
| }); | ||
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| stream.on('status', function(status) { | ||
| if (status.code != grpc.web.StatusCode.OK) { | ||
| callback({ | ||
| 'code': status.code, | ||
| 'message': status.details | ||
| }, null); | ||
| } | ||
| }); | ||
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| xhr.headers.set('Content-Type', 'application/grpc-web-text'); | ||
| xhr.headers.set('Accept', 'application/grpc-web-text'); | ||
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| var payload = this.encodeRequest_(serialized); | ||
| payload = goog.crypt.base64.encodeByteArray(payload); | ||
| xhr.send(method, 'POST', payload); | ||
| return; | ||
| }; | ||
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| /** | ||
| * @override | ||
| */ | ||
| grpc.web.GrpcWebClientBase.prototype.serverStreaming = function( | ||
| method, request, metadata, methodInfo) { | ||
| var xhr = this.newXhr_(); | ||
| var serialized = methodInfo.requestSerializeFn(request); | ||
| xhr.headers.addAll(metadata); | ||
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| var stream = new grpc.web.GrpcWebClientReadableStream(xhr); | ||
| stream.setResponseDeserializeFn(methodInfo.responseDeserializeFn); | ||
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| xhr.headers.set('Content-Type', 'application/grpc-web-text'); | ||
| xhr.headers.set('Accept', 'application/grpc-web-text'); | ||
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| var payload = this.encodeRequest_(serialized); | ||
| payload = goog.crypt.base64.encodeByteArray(payload); | ||
| xhr.send(method, 'POST', payload); | ||
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| return stream; | ||
| }; | ||
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| /** | ||
| * Create a new XhrIo object | ||
| * | ||
| * @private | ||
| * @return {!goog.net.XhrIo} The created XhrIo object | ||
| */ | ||
| grpc.web.GrpcWebClientBase.prototype.newXhr_ = function() { | ||
| return new goog.net.XhrIo(); | ||
| }; | ||
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| /** | ||
| * Encode the grpc-web request | ||
| * | ||
| * @private | ||
| * @param {!Uint8Array} serialized The serialized proto payload | ||
| * @return {!Uint8Array} The application/grpc-web padded request | ||
| */ | ||
| grpc.web.GrpcWebClientBase.prototype.encodeRequest_ = function(serialized) { | ||
| var len = serialized.length; | ||
| var bytesArray = [0, 0, 0, 0]; | ||
| var payload = new Uint8Array(5 + len); | ||
| for (var i = 3; i >= 0; i--) { | ||
| bytesArray[i] = (len % 256); | ||
| len = len >>> 8; | ||
| } | ||
| payload.set(new Uint8Array(bytesArray), 1); | ||
| payload.set(serialized, 5); | ||
| return payload; | ||
| }; |
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