trafficserver-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From bgaff <...@git.apache.org>
Subject [GitHub] trafficserver pull request #776: TS-4553: Brotli plugin
Date Fri, 01 Jul 2016 05:23:52 GMT
Github user bgaff commented on a diff in the pull request:

    https://github.com/apache/trafficserver/pull/776#discussion_r69248675
  
    --- Diff: plugins/experimental/brotli_transform/brotli_transform.cc ---
    @@ -0,0 +1,248 @@
    +/**
    +  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.
    + */
    +
    +#include <iostream>
    +#include <vector>
    +#include <zlib.h>
    +#include <atscppapi/GlobalPlugin.h>
    +#include <atscppapi/TransformationPlugin.h>
    +#include <atscppapi/PluginInit.h>
    +#include <atscppapi/Logger.h>
    +#include <brotli/enc/encode.h>
    +
    +using namespace atscppapi;
    +using namespace std;
    +
    +#define TAG "brotli_transformation"
    +
    +namespace
    +{
    +const int WINDOW_BITS             = 31; // Always use 31 for gzip.
    +unsigned int INFLATE_SCALE_FACTOR = 6;
    +unsigned int BROTLI_QUALITY       = 9;
    +}
    +
    +class GzipInflateTransformationState : noncopyable
    +{
    +public:
    +  z_stream z_stream_;
    +  bool z_stream_initialized_;
    +  int64_t bytes_produced_;
    +  TransformationPlugin::Type transformation_type_;
    +
    +  GzipInflateTransformationState(TransformationPlugin::Type type)
    +    : z_stream_initialized_(false), bytes_produced_(0), transformation_type_(type)
    +  {
    +    memset(&z_stream_, 0, sizeof(z_stream_));
    +
    +    int err = inflateInit2(&z_stream_, WINDOW_BITS);
    +    if (Z_OK != err) {
    +      TS_ERROR(TAG, "inflateInit2 failed with error code '%d'.", err);
    +    } else {
    +      z_stream_initialized_ = true;
    +    }
    +  };
    +
    +  ~GzipInflateTransformationState()
    +  {
    +    if (z_stream_initialized_) {
    +      int err = inflateEnd(&z_stream_);
    +      if (Z_OK != err && Z_STREAM_END != err) {
    +        TS_ERROR(TAG, "Unable to inflateEnd(), returned error code '%d'", err);
    +      }
    +    }
    +  };
    +};
    +
    +class BrotliVecOut : public brotli::BrotliOut
    +{
    +public:
    +  BrotliVecOut(vector<char> &out) : outVec(out) {}
    +  bool
    +  Write(const void *buf, size_t n)
    +  {
    +    outVec.insert(outVec.end(), (char *)buf, (char *)buf + n);
    +    return true;
    +  }
    +
    +private:
    +  vector<char> &outVec;
    +};
    +
    +class BrotliTransformationPlugin : public TransformationPlugin
    +{
    +public:
    +  BrotliTransformationPlugin(Transaction &transaction)
    +    : TransformationPlugin(transaction, RESPONSE_TRANSFORMATION), transaction_(transaction)
    +  {
    +    registerHook(HOOK_READ_RESPONSE_HEADERS);
    +    checkContentEncoding();
    +  }
    +
    +  void
    +  handleReadResponseHeaders(Transaction &transaction)
    +  {
    +    TS_DEBUG(TAG, "BrotliTransformationPlugin handle Read Response Headers.");
    +    transaction.getServerResponse().getHeaders().set("Content-Encoding", "br");
    +    transaction.resume();
    +  }
    +
    +  void
    +  consume(const string &data)
    +  {
    +    string uncompressedData = data;
    +    if (osContentEncoding_ == GZIP) {
    +      uncompressedData = gzipInflateData(data);
    +    }
    +    buffer_.append(uncompressedData);
    +  }
    +
    +  void
    +  handleInputComplete()
    +  {
    +    if (osContentEncoding_ != OTHER) {
    +      TS_DEBUG(TAG, "BrotliTransformationPlugin handle Input Complete.");
    +      brotli::BrotliParams params;
    +      params.quality = BROTLI_QUALITY;
    +
    +      const char *dataPtr = buffer_.c_str();
    +      brotli::BrotliMemIn brotliIn(dataPtr, buffer_.length());
    +      vector<char> out;
    +      BrotliVecOut brotliOut(out);
    +      if (!brotli::BrotliCompress(params, &brotliIn, &brotliOut)) {
    +        TS_DEBUG(TAG, "brotli compress buffer error~");
    +        outputData_ = buffer_;
    +      } else {
    +        outputData_ = string(out.begin(), out.end());
    +      }
    +    } else {
    +      outputData_ = buffer_;
    +    }
    +    produce(outputData_);
    +    setOutputComplete();
    +  }
    +
    +  virtual ~BrotliTransformationPlugin() {}
    +private:
    +  void
    +  checkContentEncoding()
    +  {
    +    Headers &hdr           = transaction_.getServerResponse().getHeaders();
    +    string contentEncoding = hdr.values("Content-Encoding");
    +    if (contentEncoding.empty()) {
    +      osContentEncoding_ = PLAINTEXT;
    +    } else {
    +      if (contentEncoding.find("gzip") != string::npos) {
    +        osContentEncoding_ = GZIP;
    +        gzipState_         = new GzipInflateTransformationState(RESPONSE_TRANSFORMATION);
    +      } else {
    +        osContentEncoding_ = OTHER;
    +      }
    +    }
    +  }
    +
    +  string
    +  gzipInflateData(const string &data)
    +  {
    +    string inflateStr = "";
    +    if (data.size() == 0) {
    +      return "";
    +    }
    +
    +    if (!gzipState_->z_stream_initialized_) {
    +      TS_ERROR(TAG, "Unable to inflate output because the z_stream was not initialized.");
    +      return "";
    +    }
    +
    +    int err                = Z_OK;
    +    int iteration          = 0;
    +    int inflate_block_size = INFLATE_SCALE_FACTOR * data.size();
    +    vector<char> buffer(inflate_block_size);
    +
    +    // Setup the compressed input
    +    gzipState_->z_stream_.next_in  = reinterpret_cast<unsigned char *>(const_cast<char
*>(data.c_str()));
    +    gzipState_->z_stream_.avail_in = data.size();
    +
    +    // Loop while we have more data to inflate
    +    while (gzipState_->z_stream_.avail_in > 0 && err != Z_STREAM_END) {
    +      TS_DEBUG(TAG, "Iteration %d: Gzip has %d bytes to inflate", ++iteration, gzipState_->z_stream_.avail_in);
    +
    +      // Setup where the decompressed output will go.
    +      gzipState_->z_stream_.next_out  = reinterpret_cast<unsigned char *>(&buffer[0]);
    +      gzipState_->z_stream_.avail_out = inflate_block_size;
    +
    +      /* Uncompress */
    +      err = inflate(&gzipState_->z_stream_, Z_SYNC_FLUSH);
    +
    +      if (err != Z_OK && err != Z_STREAM_END) {
    +        TS_ERROR(TAG, "Iteration %d: Inflate failed with error '%d'", iteration, err);
    +        gzipState_->z_stream_.next_out = NULL;
    +        return "";
    +      }
    +
    +      TS_DEBUG(TAG, "Iteration %d: Gzip inflated a total of %d bytes, producingOutput...",
iteration,
    +               (inflate_block_size - gzipState_->z_stream_.avail_out));
    +      inflateStr.append(string(&buffer[0], (inflate_block_size - gzipState_->z_stream_.avail_out)));
    +      gzipState_->bytes_produced_ += (inflate_block_size - gzipState_->z_stream_.avail_out);
    +    }
    +    gzipState_->z_stream_.next_out = NULL;
    +    return inflateStr;
    +  }
    +
    +  Transaction &transaction_;
    +  string buffer_;
    +  string outputData_;
    +  GzipInflateTransformationState *gzipState_;
    --- End diff --
    
    Memory leak, but again you shouldn't be doing this anyway as its provided.


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message