Add HTTPTransport, a Mac implementation, and an end-to-end test.

util/net/http_transport.h

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed 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.
+
+#ifndef CRASHPAD_UTIL_NET_HTTP_TRANSPORT_H_
+#define CRASHPAD_UTIL_NET_HTTP_TRANSPORT_H_
+
+#include <stdint.h>

[Mark Mentovai, 2014/10/30 21:13:54]

Unused.

[Robert Sesek, 2014/10/31 14:48:14]

Done.

+
+#include <string>
+
+#include "base/compiler_specific.h"

[Mark Mentovai, 2014/10/30 21:13:54]

You don’t need this, but you do need base/basictypes.h for
DISALLOW_COPY_AND_ASSIGN.

[Robert Sesek, 2014/10/31 14:48:14]

I get these confused, esp. because this has moved to macros.h in upstream.

+#include "base/memory/scoped_ptr.h"
+#include "util/net/http_headers.h"
+
+namespace crashpad {
+
+class HTTPBodyStream;
+
+//! \brief HTTPTransport executes a HTTP request using the specified URL, HTTP
+//!     method, headers, and body. This class can only issue a synchronous
+//!     HTTP request.
+//!
+//! This class cannot be instantiated directly. A concrete subclass must be
+//! instantiated instead, which provides an implementation to execute the
+//! request that is appropriate for the host operating system.
+class HTTPTransport {
+ public:
+  virtual ~HTTPTransport();
+
+  //! \brief Sets URL to which the request will be made.
+  //! \param[in] url The request URL.

[Mark Mentovai, 2014/10/30 21:13:54]

I’ve been putting a blank //! line between sections like \brief and \param.

[Robert Sesek, 2014/10/31 14:48:14]

Done.

+  void SetURL(const std::string& url);

[Mark Mentovai, 2014/10/30 21:13:54]

I’d consider it OK to inline these nonvirtual setters if you’re interested in
doing that.

[Robert Sesek, 2014/10/31 14:48:14]

Acknowledged.

+
+  //! \brief Sets the HTTP method to execute. E.g., GET, POST, etc.

[Mark Mentovai, 2014/10/30 21:13:54]

Is there a default method if nobody calls this?

[Robert Sesek, 2014/10/31 14:48:14]

Done.

+  //! \param[in] http_method The HTTP method.
+  void SetMethod(const std::string& http_method);
+
+  //! \brief Sets a HTTP header-value pair.
+  //! \param[in] header The HTTP header name. Any previous value set at this
+  //!     name will be overwritten.
+  //! \param[in] value The value to set for the header.
+  void SetHeader(const std::string& header, const std::string& value);

[Mark Mentovai, 2014/10/30 21:13:54]

Maybe AddHeader()?

[Robert Sesek, 2014/10/31 14:48:14]

I chose Set deliberately since this isn't additive (HTTP does allow repeating
the same header).

+
+  //! \brief Sets the stream object from which to generate the HTTP body.
+  //! \param[in] stream A HTTPBodyStream, of which this class will take
+  //!     ownership.
+  void SetBodyStream(scoped_ptr<HTTPBodyStream> stream);
+
+  //! \brief Performs the HTTP request with the configured parameters and waits
+  //!     for the execution to complete.
+  //!
+  //! \return Whether or not the request was successful, defined as returning
+  //!     a HTTP status 200 (OK) code.
+  virtual bool ExecuteSynchronously() = 0;

[Mark Mentovai, 2014/10/30 21:13:54]

I think we will want a way to get the response header and body in addition to
just having a “bool” return value. It’s OK to save that for a future change,
though. In fact, it’s probably preferable to do it in a separate change.

Rationale: the crash server returns the ID that it stored the report under to
the uploading client in the message body.

[Robert Sesek, 2014/10/31 14:48:14]

Acknowledged.

+
+ protected:
+  HTTPTransport();
+
+  const std::string& url() const { return url_; }
+  const std::string& method() const { return method_; }
+  const HTTPHeaders& headers() const { return headers_; }
+  HTTPBodyStream* body_stream() const { return body_stream_.get(); }
+
+ private:
+  std::string url_;
+  std::string method_;
+  HTTPHeaders headers_;
+  scoped_ptr<HTTPBodyStream> body_stream_;
+
+  DISALLOW_COPY_AND_ASSIGN(HTTPTransport);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_NET_HTTP_TRANSPORT_H_