PHP Proto3: gRPC PHP Plugin code generator

src/compiler/php_generator.cc

+/*
+ *
+ * Copyright 2016, 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 <map>
+
+#include "src/compiler/config.h"
+#include "src/compiler/generator_helpers.h"
+#include "src/compiler/php_generator_helpers.h"
+
+using grpc::protobuf::FileDescriptor;
+using grpc::protobuf::ServiceDescriptor;
+using grpc::protobuf::MethodDescriptor;
+using grpc::protobuf::Descriptor;
+using grpc::protobuf::io::Printer;
+using grpc::protobuf::io::StringOutputStream;
+using std::map;
+
+namespace grpc_php_generator {
+namespace {
+
+grpc::string MessageIdentifierName(const grpc::string &name) {
+  std::vector<grpc::string> tokens = grpc_generator::tokenize(name, ".");
+  std::ostringstream oss;
+  for (unsigned int i = 0; i < tokens.size(); i++) {
+    oss << (i == 0 ? "" : "\\")
+        << grpc_generator::CapitalizeFirstLetter(tokens[i]);
+  }
+  return oss.str();
+}
+
+void PrintMethod(const MethodDescriptor *method, Printer *out) {
+  const Descriptor *input_type = method->input_type();
+  const Descriptor *output_type = method->output_type();
+  map<grpc::string, grpc::string> vars;
+  vars["service_name"] = method->service()->full_name();
+  vars["name"] = method->name();
+  vars["input_type_id"] = MessageIdentifierName(input_type->full_name());
+  vars["output_type_id"] = MessageIdentifierName(output_type->full_name());
+
+  out->Print("/**\n");
+  out->Print(GetPHPComments(method, " *").c_str());
+  if (method->client_streaming()) {
+    out->Print(vars,
+               " * @param array $$metadata metadata\n"
+               " * @param array $$options call options\n */\n"
+               "public function $name$($$metadata = [], "
+               "$$options = []) {\n");
+    out->Indent();
+    if (method->server_streaming()) {
+      out->Print("return $$this->_bidiRequest(");
+    } else {
+      out->Print("return $$this->_clientStreamRequest(");
+    }
+    out->Print(vars,
+               "'/$service_name$/$name$',\n"
+               "['\\$output_type_id$','decode'],\n"
+               "$$metadata, $$options);\n");
+  } else {
+    out->Print(vars,
+               " * @param \\$input_type_id$ $$argument input argument\n"
+               " * @param array $$metadata metadata\n"
+               " * @param array $$options call options\n */\n"
+               "public function $name$(\\$input_type_id$ $$argument,\n"
+               "  $$metadata = [], $$options = []) {\n");
+    out->Indent();
+    if (method->server_streaming()) {
+      out->Print("return $$this->_serverStreamRequest(");
+    } else {
+      out->Print("return $$this->_simpleRequest(");
+    }
+    out->Print(vars,
+               "'/$service_name$/$name$',\n"
+               "$$argument,\n"
+               "['\\$output_type_id$', 'decode'],\n"
+               "$$metadata, $$options);\n");
+  }
+  out->Outdent();
+  out->Print("}\n\n");
+}
+
+// Prints out the service descriptor object
+void PrintService(const ServiceDescriptor *service, Printer *out) {
+  map<grpc::string, grpc::string> vars;
+  out->Print(GetPHPComments(service, "//").c_str());
+  vars["name"] = service->name();
+  out->Print(vars, "class $name$Client extends \\Grpc\\BaseStub {\n\n");
+  out->Indent();
+  out->Print(
+      "/**\n * @param string $$hostname hostname\n"
+      " * @param array $$opts channel options\n"
+      " * @param Grpc\\Channel $$channel (optional) re-use channel "
+      "object\n */\n"
+      "public function __construct($$hostname, $$opts, "
+      "$$channel = null) {\n");
+  out->Indent();
+  out->Print("parent::__construct($$hostname, $$opts, $$channel);\n");
+  out->Outdent();
+  out->Print("}\n\n");
+  for (int i = 0; i < service->method_count(); i++) {
+    grpc::string method_name =
+        grpc_generator::LowercaseFirstLetter(service->method(i)->name());
+    PrintMethod(service->method(i), out);
+  }
+  out->Outdent();
+  out->Print("}\n\n");
+}
+
+void PrintServices(const FileDescriptor *file, Printer *out) {
+  map<grpc::string, grpc::string> vars;
+  vars["package"] = MessageIdentifierName(file->package());
+  out->Print(vars, "namespace $package$ {\n\n");
+  out->Indent();
+  for (int i = 0; i < file->service_count(); i++) {
+    PrintService(file->service(i), out);
+  }
+  out->Outdent();
+  out->Print("}\n");
+}
+}
+
+grpc::string GenerateFile(const FileDescriptor *file) {
+  grpc::string output;
+  {
+    StringOutputStream output_stream(&output);
+    Printer out(&output_stream, '$');
+
+    if (file->service_count() == 0) {
+      return output;
+    }
+    out.Print("<?php\n");
+    out.Print("// GENERATED CODE -- DO NOT EDIT!\n\n");
+
+    grpc::string leading_comments = GetPHPComments(file, "//");
+    if (!leading_comments.empty()) {
+      out.Print("// Original file comments:\n");
+      out.Print(leading_comments.c_str());
+    }
+
+    PrintServices(file, &out);
+  }
+  return output;
+}
+
+}  // namespace grpc_php_generator

src/compiler/php_generator.h

+/*
+ *
+ * Copyright 2016, 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_INTERNAL_COMPILER_PHP_GENERATOR_H
+#define GRPC_INTERNAL_COMPILER_PHP_GENERATOR_H
+
+#include "src/compiler/config.h"
+
+namespace grpc_php_generator {
+
+grpc::string GenerateFile(const grpc::protobuf::FileDescriptor *file);
+
+}  // namespace grpc_php_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_PHP_GENERATOR_H

src/compiler/php_generator_helpers.h

+/*
+ *
+ * Copyright 2016, 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_INTERNAL_COMPILER_PHP_GENERATOR_HELPERS_H
+#define GRPC_INTERNAL_COMPILER_PHP_GENERATOR_HELPERS_H
+
+#include <algorithm>
+
+#include "src/compiler/config.h"
+#include "src/compiler/generator_helpers.h"
+
+namespace grpc_php_generator {
+
+inline grpc::string GetPHPServiceFilename(const grpc::string& filename) {
+  return grpc_generator::StripProto(filename) + "_grpc_pb.php";
+}
+
+// Get leading or trailing comments in a string. Comment lines start with "// ".
+// Leading detached comments are put in in front of leading comments.
+template <typename DescriptorType>
+inline grpc::string GetPHPComments(const DescriptorType* desc,
+                                   grpc::string prefix) {
+  return grpc_generator::GetPrefixedComments(desc, true, prefix);
+}
+
+}  // namespace grpc_php_generator
+
+#endif  // GRPC_INTERNAL_COMPILER_PHP_GENERATOR_HELPERS_H

src/compiler/php_plugin.cc

+/*
+ *
+ * Copyright 2016, 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.
+ *
+ */
+
+// Generates PHP gRPC service interface out of Protobuf IDL.
+
+#include <memory>
+
+#include "src/compiler/config.h"
+#include "src/compiler/php_generator.h"
+#include "src/compiler/php_generator_helpers.h"
+
+using grpc_php_generator::GenerateFile;
+using grpc_php_generator::GetPHPServiceFilename;
+
+class PHPGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
+ public:
+  PHPGrpcGenerator() {}
+  ~PHPGrpcGenerator() {}
+
+  bool Generate(const grpc::protobuf::FileDescriptor *file,
+                const grpc::string &parameter,
+                grpc::protobuf::compiler::GeneratorContext *context,
+                grpc::string *error) const {
+    grpc::string code = GenerateFile(file);
+    if (code.size() == 0) {
+      return true;
+    }
+
+    // Get output file name
+    grpc::string file_name = GetPHPServiceFilename(file->name());
+
+    std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> output(
+        context->Open(file_name));
+    grpc::protobuf::io::CodedOutputStream coded_out(output.get());
+    coded_out.WriteRaw(code.data(), code.size());
+    return true;
+  }
+};
+
+int main(int argc, char *argv[]) {
+  PHPGrpcGenerator generator;
+  return grpc::protobuf::compiler::PluginMain(argc, argv, &generator);
+}