Added ruby wrapper for grpc_compression_options

src/ruby/ext/grpc/rb_compression_options.c

+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <ruby/ruby.h>
+
+#include "rb_compression_options.h"
+#include "rb_grpc_imports.generated.h"
+
+#include <grpc/compression.h>
+#include <grpc/grpc.h>
+#include <grpc/impl/codegen/alloc.h>
+#include <grpc/impl/codegen/compression_types.h>
+#include <grpc/impl/codegen/grpc_types.h>
+#include <string.h>
+
+#include "rb_grpc.h"
+
+static VALUE grpc_rb_cCompressionOptions = Qnil;
+
+/* grpc_rb_compression_options wraps a grpc_compression_options.
+ * Note that ruby objects of this type don't carry any state in other
+ * Ruby objects and don't have a mark for GC. */
+typedef struct grpc_rb_compression_options {
+  /* The actual compression options that's being wrapped */
+  grpc_compression_options *wrapped;
+} grpc_rb_compression_options;
+
+/* Destroys the compression options instances and free the
+ * wrapped grpc compression options. */
+static void grpc_rb_compression_options_free(void *p) {
+  grpc_rb_compression_options *wrapper = NULL;
+  if (p == NULL) {
+    return;
+  };
+  wrapper = (grpc_rb_compression_options *)p;
+
+  if (wrapper->wrapped != NULL) {
+    gpr_free(wrapper->wrapped);
+    wrapper->wrapped = NULL;
+  }
+
+  xfree(p);
+}
+
+/* Ruby recognized data type for the CompressionOptions class. */
+static rb_data_type_t grpc_rb_compression_options_data_type = {
+    "grpc_compression_options",
+    {NULL,
+     grpc_rb_compression_options_free,
+     GRPC_RB_MEMSIZE_UNAVAILABLE,
+     {NULL, NULL}},
+    NULL,
+    NULL,
+#ifdef RUBY_TYPED_FREE_IMMEDIATELY
+    RUBY_TYPED_FREE_IMMEDIATELY
+#endif
+};
+
+/* Allocates CompressionOptions instances.
+   Allocate the wrapped grpc compression options and
+   initialize it here too. */
+static VALUE grpc_rb_compression_options_alloc(VALUE cls) {
+  grpc_rb_compression_options *wrapper =
+      gpr_malloc(sizeof(grpc_rb_compression_options));
+  wrapper->wrapped = NULL;
+  wrapper->wrapped = gpr_malloc(sizeof(grpc_compression_options));
+  grpc_compression_options_init(wrapper->wrapped);
+
+  return TypedData_Wrap_Struct(cls, &grpc_rb_compression_options_data_type,
+                               wrapper);
+}
+
+/* Disables a compression algorithm, given the GRPC core internal number of a
+ * compression algorithm. */
+VALUE grpc_rb_compression_options_disable_compression_algorithm_internal(
+    VALUE self, VALUE algorithm_to_disable) {
+  grpc_compression_algorithm compression_algorithm = 0;
+  grpc_rb_compression_options *wrapper = NULL;
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+  compression_algorithm =
+      (grpc_compression_algorithm)NUM2INT(algorithm_to_disable);
+
+  grpc_compression_options_disable_algorithm(wrapper->wrapped,
+                                             compression_algorithm);
+
+  return Qnil;
+}
+
+/* Provides a bitset as a ruby number that is suitable to pass to
+ * the GRPC core as a channel argument to enable compression algorithms. */
+VALUE grpc_rb_compression_options_get_enabled_algorithms_bitset(VALUE self) {
+  grpc_rb_compression_options *wrapper = NULL;
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+  return INT2NUM((int)wrapper->wrapped->enabled_algorithms_bitset);
+}
+
+void grpc_rb_compression_options_set_default_level_helper(
+    grpc_compression_options *compression_options,
+    grpc_compression_level level) {
+  compression_options->default_level.is_set |= 1;
+  compression_options->default_level.level = level;
+}
+
+/* Sets the default compression level, given the name of a compression level.
+ * Throws an error if no algorithm matched. */
+VALUE grpc_rb_compression_options_set_default_level(VALUE self,
+                                                    VALUE new_level) {
+  char *level_name = NULL;
+  grpc_rb_compression_options *wrapper = NULL;
+  long name_len = 0;
+  VALUE ruby_str = Qnil;
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+
+  /* Take both string and symbol parameters */
+  ruby_str = rb_funcall(new_level, rb_intern("to_s"), 0);
+
+  level_name = RSTRING_PTR(ruby_str);
+  name_len = RSTRING_LEN(ruby_str);
+
+  /* Check the compression level of the name passed in, and see which macro
+   * from the GRPC core header files match. */
+  if (strncmp(level_name, "none", name_len) == 0) {
+    grpc_rb_compression_options_set_default_level_helper(
+        wrapper->wrapped, GRPC_COMPRESS_LEVEL_NONE);
+  } else if (strncmp(level_name, "low", name_len) == 0) {
+    grpc_rb_compression_options_set_default_level_helper(
+        wrapper->wrapped, GRPC_COMPRESS_LEVEL_LOW);
+  } else if (strncmp(level_name, "medium", name_len) == 0) {
+    grpc_rb_compression_options_set_default_level_helper(
+        wrapper->wrapped, GRPC_COMPRESS_LEVEL_MED);
+  } else if (strncmp(level_name, "high", name_len) == 0) {
+    grpc_rb_compression_options_set_default_level_helper(
+        wrapper->wrapped, GRPC_COMPRESS_LEVEL_HIGH);
+  } else {
+    rb_raise(rb_eNameError,
+             "Invalid compression level name. Supported levels: none, low, "
+             "medium, high");
+  }
+
+  return Qnil;
+}
+
+/* Gets the internal value of a compression algorithm suitable as the value
+ * in a GRPC core channel arguments hash.
+ * Raises an error if the name of the algorithm passed in is invalid. */
+void grpc_rb_compression_options_get_internal_value_of_algorithm(
+    VALUE algorithm_name, grpc_compression_algorithm *compression_algorithm) {
+  VALUE ruby_str = Qnil;
+  char *name_str = NULL;
+  long name_len = 0;
+
+  /* Accept ruby symbol and string parameters. */
+  ruby_str = rb_funcall(algorithm_name, rb_intern("to_s"), 0);
+  name_str = RSTRING_PTR(ruby_str);
+  name_len = RSTRING_LEN(ruby_str);
+
+  /* Raise an error if the name isn't recognized as a compression algorithm by
+   * the algorithm parse function
+   * in GRPC core. */
+  if (!grpc_compression_algorithm_parse(name_str, name_len,
+                                        compression_algorithm)) {
+    rb_raise(rb_eNameError,
+             "Invalid compression algorithm name.");
+  }
+}
+
+/* Sets the default algorithm to the name of the algorithm passed in.
+ * Raises an error if the name is not a valid compression algorithm name. */
+VALUE grpc_rb_compression_options_set_default_algorithm(VALUE self,
+                                                        VALUE algorithm_name) {
+  grpc_rb_compression_options *wrapper = NULL;
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+
+  grpc_rb_compression_options_get_internal_value_of_algorithm(
+      algorithm_name, &wrapper->wrapped->default_algorithm.algorithm);
+  wrapper->wrapped->default_algorithm.is_set |= 1;
+
+  return Qnil;
+}
+
+/* Gets the internal value of the default compression level that is to be passed
+ * to the
+ * the GRPC core as a channel argument value.
+ * A nil return value means that it hasn't been set. */
+VALUE grpc_rb_compression_options_default_algorithm_internal_value(VALUE self) {
+  grpc_rb_compression_options *wrapper = NULL;
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+
+  if (wrapper->wrapped->default_algorithm.is_set) {
+    return INT2NUM(wrapper->wrapped->default_algorithm.algorithm);
+  } else {
+    return Qnil;
+  }
+}
+
+/* Gets the internal value of the default compression level that is to be passed
+ * to the GRPC core as a channel argument value.
+ * A nil return value means that it hasn't been set. */
+VALUE grpc_rb_compression_options_default_level_internal_value(VALUE self) {
+  grpc_rb_compression_options *wrapper = NULL;
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+
+  if (wrapper->wrapped->default_level.is_set) {
+    return INT2NUM((int)wrapper->wrapped->default_level.level);
+  } else {
+    return Qnil;
+  }
+}
+
+/* Disables compression algorithms by their names. Raises an error if an unkown
+ * name was passed. */
+VALUE grpc_rb_compression_options_disable_algorithms(int argc, VALUE *argv,
+                                                     VALUE self) {
+  VALUE algorithm_names = Qnil;
+  VALUE ruby_str = Qnil;
+  grpc_compression_algorithm internal_algorithm_value;
+
+  /* read variadic argument list of names into the algorithm_name ruby array. */
+  rb_scan_args(argc, argv, "0*", &algorithm_names);
+
+  for (int i = 0; i < RARRAY_LEN(algorithm_names); i++) {
+    ruby_str =
+        rb_funcall(rb_ary_entry(algorithm_names, i), rb_intern("to_s"), 0);
+    grpc_rb_compression_options_get_internal_value_of_algorithm(
+        ruby_str, &internal_algorithm_value);
+    rb_funcall(self, rb_intern("disable_algorithm_internal"), 1,
+               LONG2NUM((long)internal_algorithm_value));
+  }
+
+  return Qnil;
+}
+
+/* Provides a ruby hash of GRPC core channel argument key-values that
+ * correspond to the compression settings on this instance. */
+VALUE grpc_rb_compression_options_to_hash(VALUE self) {
+  grpc_rb_compression_options *wrapper = NULL;
+  grpc_compression_options *compression_options = NULL;
+  VALUE channel_arg_hash = rb_funcall(rb_cHash, rb_intern("new"), 0);
+
+  TypedData_Get_Struct(self, grpc_rb_compression_options,
+                       &grpc_rb_compression_options_data_type, wrapper);
+  compression_options = wrapper->wrapped;
+
+  /* Add key-value pairs to the new Ruby hash. It can be used
+   * as GRPC core channel arguments. */
+  if (compression_options->default_level.is_set) {
+    rb_funcall(channel_arg_hash, rb_intern("[]="), 2,
+               rb_str_new2(GRPC_COMPRESSION_CHANNEL_DEFAULT_LEVEL),
+               INT2NUM((int)compression_options->default_level.level));
+  }
+
+  if (compression_options->default_algorithm.is_set) {
+    rb_funcall(channel_arg_hash, rb_intern("[]="), 2,
+               rb_str_new2(GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM),
+               INT2NUM((int)compression_options->default_algorithm.algorithm));
+  }
+
+  rb_funcall(channel_arg_hash, rb_intern("[]="), 2,
+             rb_str_new2(GRPC_COMPRESSION_CHANNEL_ENABLED_ALGORITHMS_BITSET),
+             INT2NUM((int)compression_options->enabled_algorithms_bitset));
+
+  return channel_arg_hash;
+}
+
+void Init_grpc_compression_options() {
+  grpc_rb_cCompressionOptions = rb_define_class_under(
+      grpc_rb_mGrpcCore, "CompressionOptions", rb_cObject);
+
+  /* Allocates an object managed by the ruby runtime. */
+  rb_define_alloc_func(grpc_rb_cCompressionOptions,
+                       grpc_rb_compression_options_alloc);
+
+  /* Private method for disabling algorithms by a variadic list of names. */
+  rb_define_private_method(grpc_rb_cCompressionOptions, "disable_algorithms",
+                           grpc_rb_compression_options_disable_algorithms, -1);
+  /* Private method for disabling an algorithm by its enum value. */
+  rb_define_private_method(
+      grpc_rb_cCompressionOptions, "disable_algorithm_internal",
+      grpc_rb_compression_options_disable_compression_algorithm_internal, 1);
+
+  /* Private method for getting the bitset of enabled algorithms. */
+  rb_define_private_method(
+      grpc_rb_cCompressionOptions, "enabled_algorithms_bitset",
+      grpc_rb_compression_options_get_enabled_algorithms_bitset, 0);
+
+  /* Private method for setting the default algorithm by name. */
+  rb_define_private_method(grpc_rb_cCompressionOptions, "set_default_algorithm",
+                           grpc_rb_compression_options_set_default_algorithm,
+                           1);
+  /* Private method for getting the internal enum value of the default
+   * algorithm. */
+  rb_define_private_method(
+      grpc_rb_cCompressionOptions, "default_algorithm_internal_value",
+      grpc_rb_compression_options_default_algorithm_internal_value, 0);
+
+  /* Private method for setting the default compression level by name. */
+  rb_define_private_method(grpc_rb_cCompressionOptions, "set_default_level",
+                           grpc_rb_compression_options_set_default_level, 1);
+
+  /* Private method for getting the internal enum value of the default level. */
+  rb_define_private_method(
+      grpc_rb_cCompressionOptions, "default_level_internal_value",
+      grpc_rb_compression_options_default_level_internal_value, 0);
+
+  /* Public method for returning a hash of the compression settings suitable
+   * for passing to server or channel args. */
+  rb_define_method(grpc_rb_cCompressionOptions, "to_hash",
+                   grpc_rb_compression_options_to_hash, 0);
+}

src/ruby/ext/grpc/rb_compression_options.h

+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_RB_COMPRESSION_OPTIONS_H_
+#define GRPC_RB_COMPRESSION_OPTIONS_H_
+
+#include <ruby/ruby.h>
+
+#include <grpc/grpc.h>
+
+/* Initializes the compression options ruby wrapper. */
+void Init_grpc_compression_options();
+
+#endif /* GRPC_RB_COMPRESSION_OPTIONS_H_ */

src/ruby/ext/grpc/rb_grpc.c

@@ -49,6 +49,7 @@
 #include "rb_loader.h"
 #include "rb_server.h"
 #include "rb_server_credentials.h"
+#include "rb_compression_options.h"
 
 static VALUE grpc_rb_cTimeVal = Qnil;
 
@@ -332,4 +333,5 @@ void Init_grpc_c() {
   Init_grpc_server_credentials();
   Init_grpc_status_codes();
   Init_grpc_time_consts();
+  Init_grpc_compression_options();
 }

src/ruby/lib/grpc.rb

@@ -35,6 +35,7 @@ require_relative 'grpc/logconfig'
 require_relative 'grpc/notifier'
 require_relative 'grpc/version'
 require_relative 'grpc/core/time_consts'
+require_relative 'grpc/core/compression_options'
 require_relative 'grpc/generic/active_call'
 require_relative 'grpc/generic/client_stub'
 require_relative 'grpc/generic/service'

src/ruby/lib/grpc/core/compression_options.rb

+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+require_relative '../grpc'
+
+# GRPC contains the General RPC module.
+module GRPC
+  module Core
+    # Wrapper for grpc_compression_options in core
+    # This class is defined as a C extension but is reopened here
+    # to add the initialization logic.
+    #
+    # This class wraps a GRPC core compression options.
+    #
+    # It can be used to create a channel argument key-value hash
+    # with keys and values that correspond to the compression settings
+    # provided here.
+    #
+    # call-seq:
+    #   options = CompressionOptions.new(
+    #     default_level: low,
+    #     disabled_algorithms: [:<valid_algorithm_name>])
+    #
+    #   channel_args = Hash.new[...]
+    #   channel_args_with_compression_args = channel_args.merge(options)
+    class CompressionOptions
+      alias_method :to_channel_arg_hash, :to_hash
+
+      # Initializes a CompresionOptions instance.
+      # Starts out with all available compression
+      # algorithms enabled by default.
+      #
+      # Valid algorithms are those supported by the GRPC core
+      #
+      # @param default_level [String | Symbol]
+      #   one of 'none', 'low', 'medium', 'high'
+      # @param default_algorithm [String | Symbol]
+      #   a valid GRPC algorithm
+      # @param disabled_algorithms [Array<String, Symbol>]
+      #   can contain valid GRPC algorithm names
+      def initialize(default_algorithm: nil,
+                     default_level: nil,
+                     disabled_algorithms: [])
+        # Convert possible symbols to strings for comparisons
+        disabled_algorithms = disabled_algorithms.map(&:to_s)
+
+        if disabled_algorithms.include?(default_algorithm.to_s)
+          fail ArgumentError("#{default_algorithm} is in disabled_algorithms")
+        end
+
+        set_default_algorithm(default_algorithm.to_s) unless
+          default_algorithm.nil?
+
+        set_default_level(default_level.to_s) unless
+          default_level.nil?
+
+        # *disabled_algorithms spreads array into variadic method parameters
+        disable_algorithms(*disabled_algorithms) unless
+          disabled_algorithms.nil? || disabled_algorithms.empty?
+      end
+
+      def to_s
+        to_hash.to_s
+      end
+    end
+  end
+end

src/ruby/spec/compression_options_spec.rb

+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+require 'grpc'
+
+describe GRPC::Core::CompressionOptions do
+  # Names of supported compression algorithms and their internal enum values
+  ALGORITHMS = {
+    identity: 0,
+    deflate: 1,
+    gzip: 2
+  }
+
+  # Compression algorithms and their corresponding bits in the internal
+  # enabled algorithms bitset for GRPC core channel args.
+  ALGORITHM_BITS = {
+    identity: 0x1,
+    deflate: 0x2,
+    gzip: 0x4
+  }
+
+  # "enabled algorithms bitset" when all compression algorithms are enabled
+  ALL_ENABLED_BITSET = 0x7
+
+  # "enabled algorithms bitset" when all compression algorithms are disabled
+  ALL_DISABLED_BITSET = 0x0
+
+  # Names of valid supported compression levels and their internal enum values
+  COMPRESS_LEVELS = {
+    none: 0,
+    low: 1,
+    medium: 2,
+    high: 3
+  }
+
+  it 'implements to_s' do
+    expect { GRPC::Core::CompressionOptions.new.to_s }.to_not raise_error
+  end
+
+  it '#to_channel_arg_hash gives the same result as #to_hash' do
+    options = GRPC::Core::CompressionOptions.new
+    expect(options.to_channel_arg_hash).to eql(options.to_hash)
+  end
+
+  # Test the normal call sequence of creating an instance
+  # and then obtaining the resulting channel-arg hash that
+  # corresponds to the compression settings of the instance
+  describe 'creating and converting to channel args hash' do
+    it 'gives the correct channel args when nothing has been adjusted yet' do
+      expect(GRPC::Core::CompressionOptions.new.to_hash).to(
+        eql('grpc.compression_enabled_algorithms_bitset' => 0x7))
+    end
+
+    it 'gives the correct channel args after everything has been disabled' do
+      options = GRPC::Core::CompressionOptions.new(
+        default_algorithm: 'identity',
+        default_level: 'none',
+        disabled_algorithms: [:gzip, :deflate]
+      )
+
+      expect(options.to_hash).to(
+        eql('grpc.default_compression_algorithm' => 0,
+            'grpc.default_compression_level' => 0,
+            'grpc.compression_enabled_algorithms_bitset' => 0x1)
+      )
+    end
+
+    it 'gives correct channel args with all args set' do
+      options = GRPC::Core::CompressionOptions.new(
+        default_algorithm: 'gzip',
+        default_level: 'low',
+        disabled_algorithms: ['deflate']
+      )
+
+      expected_bitset = ALL_ENABLED_BITSET & ~ALGORITHM_BITS[:deflate]
+
+      expect(options.to_hash).to(
+        eql('grpc.default_compression_algorithm' => ALGORITHMS[:gzip],
+            'grpc.default_compression_level' => COMPRESS_LEVELS[:low],
+            'grpc.compression_enabled_algorithms_bitset' => expected_bitset)
+      )
+    end
+
+    it 'gives correct channel args when no algorithms are disabled' do
+      options = GRPC::Core::CompressionOptions.new(
+        default_algorithm: 'identity',
+        default_level: 'high'
+      )
+
+      expect(options.to_hash).to(
+        eql('grpc.default_compression_algorithm' => ALGORITHMS[:identity],
+            'grpc.default_compression_level' => COMPRESS_LEVELS[:high],
+            'grpc.compression_enabled_algorithms_bitset' => ALL_ENABLED_BITSET)
+      )
+    end
+
+    # Raising an error in when attempting to set the default algorithm
+    # to something that is also requested to be disabled
+    it 'gives raises an error when the chosen default algorithm is disabled' do
+      blk = proc do
+        GRPC::Core::CompressionOptions.new(
+          default_algorithm: :gzip,
+          disabled_algorithms: [:gzip])
+      end
+      expect { blk.call }.to raise_error
+    end
+  end
+
+  # Test the private methods in the C extension that interact with
+  # the wrapped grpc_compression_options.
+  #
+  # Using #send to call private methods.
+  describe 'private internal methods' do
+    it 'mutating functions and accessors should be private' do
+      options = GRPC::Core::CompressionOptions.new
+
+      [:disable_algorithm_internal,
+       :disable_algorithms,
+       :set_default_algorithm,
+       :set_default_level,
+       :default_algorithm_internal_value,
+       :default_level_internal_value].each do |method_name|
+        expect(options.private_methods).to include(method_name)
+      end
+    end
+
+    describe '#disable_algorithms' do
+      ALGORITHMS.each_pair do |name, internal_value|
+        it "passes #{internal_value} to internal method for #{name}" do
+          options = GRPC::Core::CompressionOptions.new
+          expect(options).to receive(:disable_algorithm_internal)
+            .with(internal_value)
+
+          options.send(:disable_algorithms, name)
+        end
+      end
+
+      it 'should work with multiple parameters' do
+        options = GRPC::Core::CompressionOptions.new
+
+        ALGORITHMS.values do |internal_value|
+          expect(options).to receive(:disable_algorithm_internal)
+            .with(internal_value)
+        end
+
+        # disabled_algorithms is a private, variadic method
+        options.send(:disable_algorithms, *ALGORITHMS.keys)
+      end
+    end
+
+    describe '#new default values' do
+      it 'should start out with all algorithms enabled' do
+        options = GRPC::Core::CompressionOptions.new
+        bitset = options.send(:enabled_algorithms_bitset)
+        expect(bitset).to eql(ALL_ENABLED_BITSET)
+      end
+
+      it 'should start out with no default algorithm' do
+        options = GRPC::Core::CompressionOptions.new
+        expect(options.send(:default_algorithm_internal_value)).to be_nil
+      end
+
+      it 'should start out with no default level' do
+        options = GRPC::Core::CompressionOptions.new
+        expect(options.send(:default_level_internal_value)).to be_nil
+      end
+    end
+
+    describe '#enabled_algoritms_bitset' do
+      it 'should respond to disabling one algorithm' do
+        options = GRPC::Core::CompressionOptions.new
+        options.send(:disable_algorithms, :gzip)
+        current_bitset = options.send(:enabled_algorithms_bitset)
+        expect(current_bitset & ALGORITHM_BITS[:gzip]).to be_zero
+      end
+
+      it 'should respond to disabling multiple algorithms' do
+        options = GRPC::Core::CompressionOptions.new
+
+        # splitting up algorithms array since #disable_algorithms is variadic
+        options.send(:disable_algorithms, *ALGORITHMS.keys)
+        current_bitset = options.send(:enabled_algorithms_bitset)
+        expect(current_bitset).to eql(ALL_DISABLED_BITSET)
+      end
+    end
+
+    describe 'setting the default algorithm by name' do
+      it 'should set the internal value of the default algorithm' do
+        ALGORITHMS.each_pair do |name, expected_internal_value|
+          options = GRPC::Core::CompressionOptions.new
+          options.send(:set_default_algorithm, name)
+          internal_value = options.send(:default_algorithm_internal_value)
+          expect(internal_value).to eql(expected_internal_value)
+        end
+      end
+
+      it 'should fail with invalid algorithm names' do
+        [:none, :low, :huffman, :unkown, Object.new, 1].each do |name|
+          blk = proc do
+            options = GRPC::CoreCompressionOptions.new
+            options.send(:set_default_algorithm, name)
+          end
+          expect { blk.call }.to raise_error
+        end
+      end
+    end
+
+    describe 'setting the default level by name' do
+      it 'should set the internal value of the default compression value' do
+        COMPRESS_LEVELS.each_pair do |level, expected_internal_value|
+          options = GRPC::Core::CompressionOptions.new
+          options.send(:set_default_level, level)
+          internal_value = options.send(:default_level_internal_value)
+          expect(internal_value).to eql(expected_internal_value)
+        end
+      end
+
+      it 'should fail with invalid names' do
+        [:identity, :gzip, :unkown, :any, Object.new, 1].each do |name|
+          blk = proc do
+            GRPC::Core::CompressionOptions.new.send(:set_default_level, name)
+          end
+          expect { blk.call }.to raise_error
+        end
+      end
+    end
+  end
+end