inspector: add initial support for network inspection

lib/internal/process/pre_execution.js

@@ -3,6 +3,7 @@
 const {
   ArrayPrototypeForEach,
   Date,
+  DateNow,
   DatePrototypeGetDate,
   DatePrototypeGetFullYear,
   DatePrototypeGetHours,
@@ -98,6 +99,7 @@ function prepareExecution(options) {
   const mainEntry = patchProcessObject(expandArgv1);
   setupTraceCategoryState();
   setupInspectorHooks();
+  setupNetworkInspection();
   setupNavigator();
   setupWarningHandler();
   setupWebStorage();
@@ -438,6 +440,51 @@ function setupInspectorHooks() {
   }
 }
 
+function setupNetworkInspection() {
+  if (!internalBinding('config').hasInspector) {
+    return;
+  }
+  const dc = require('diagnostics_channel');
+  const {
+    dataReceived,
+    loadingFinished,
+    requestWillBeSent,
+    responseReceived,
+  } = internalBinding('inspector');
+
+  let requestId = 0;
+  const getNextRequestId = () => `node-network-event-${++requestId}`;
+
+  dc.subscribe('http.client.request.start', ({ request }) => {
+    const url = `${request.protocol}//${request.host}${request.path}`;
+    const wallTime = DateNow();
+    const timestamp = wallTime / 1000;
+    request._inspectorRequestId = getNextRequestId();
+    requestWillBeSent(request._inspectorRequestId, url, request.method, timestamp, wallTime);
+  });
+  dc.subscribe('http.client.response.finish', ({ request, response }) => {
+    responseReceived(request._inspectorRequestId, DateNow() / 1000);
+    let responseString = '';
+    const onData = (chunk) => {
+      dataReceived(request._inspectorRequestId, DateNow() / 1000, chunk.length);
+      responseString += chunk.toString();
+    };
+    response.on('data', onData);
+    response.on('end', () => {
+      loadingFinished(request._inspectorRequestId, responseString, DateNow() / 1000, responseString.length);
+      response.removeListener('data', onData);
+    });
+  });
+
+  dc.subscribe('undici:request:create', ({ request }) => {
+    const url = `${request.origin}${request.path}`;
+    const wallTime = DateNow();
+    const timestamp = wallTime / 1000;
+    request._inspectorRequestId = getNextRequestId();
+    requestWillBeSent(request._inspectorRequestId, url, request.method, timestamp, wallTime);
+  });
+}
+
 // In general deprecations are initialized wherever the APIs are implemented,
 // this is used to deprecate APIs implemented in C++ where the deprecation
 // utilities are not easily accessible.

src/inspector/network_agent.cc

@@ -0,0 +1,61 @@
+#include "network_agent.h"
+
+#include "inspector_agent.h"
+
+namespace node {
+namespace inspector {
+namespace protocol {
+
+std::unique_ptr<Network::Request> Request(const String& url,
+                                          const String& method) {
+  return Network::Request::create().setUrl(url).setMethod(method).build();
+}
+
+NetworkAgent::NetworkAgent() {}
+
+void NetworkAgent::Wire(UberDispatcher* dispatcher) {
+  frontend_ = std::make_unique<Network::Frontend>(dispatcher->channel());
+  Network::Dispatcher::wire(dispatcher, this);
+}
+
+DispatchResponse NetworkAgent::getResponseBody(const String& in_requestId,
+                                               String* out_body) {
+  auto it = request_id_to_response_.find(in_requestId);
+  if (it != request_id_to_response_.end()) {
+    *out_body = it->second;
+    request_id_to_response_.erase(it);
+  }
+  return DispatchResponse::OK();
+}
+
+void NetworkAgent::requestWillBeSent(const String& request_id,
+                                     const String& url,
+                                     const String& method,
+                                     double timestamp,
+                                     double wall_time) {
+  frontend_->requestWillBeSent(
+      request_id, Request(url, method), timestamp, wall_time);
+}
+
+void NetworkAgent::responseReceived(const String& request_id,
+                                    double timestamp) {
+  frontend_->responseReceived(request_id, timestamp);
+}
+
+void NetworkAgent::dataReceived(const String& request_id,
+                                double timestamp,
+                                int data_length) {
+  frontend_->dataReceived(request_id, timestamp, data_length);
+}
+
+void NetworkAgent::loadingFinished(const String& request_id,
+                                   const String& response,
+                                   double timestamp,
+                                   int encoded_data_length) {
+  request_id_to_response_[request_id] = response;
+  frontend_->loadingFinished(request_id, timestamp, encoded_data_length);
+}
+
+}  // namespace protocol
+}  // namespace inspector
+}  // namespace node

src/inspector/network_agent.h

@@ -0,0 +1,49 @@
+#ifndef SRC_INSPECTOR_NETWORK_AGENT_H_
+#define SRC_INSPECTOR_NETWORK_AGENT_H_
+
+#include "node/inspector/protocol/Network.h"
+#include "v8.h"
+
+#include <unordered_map>
+
+namespace node {
+
+namespace inspector {
+namespace protocol {
+
+class NetworkAgent : public Network::Backend {
+ public:
+  NetworkAgent();
+
+  void Wire(UberDispatcher* dispatcher);
+
+  DispatchResponse getResponseBody(const String& in_requestId,
+                                   String* out_body) override;
+
+  void requestWillBeSent(const String& request_id,
+                         const String& url,
+                         const String& method,
+                         double timestamp,
+                         double wall_time);
+
+  void responseReceived(const String& request_id, double timestamp);
+
+  void dataReceived(const String& request_id,
+                    double timestamp,
+                    int data_length);
+
+  void loadingFinished(const String& request_id,
+                       const String& response,
+                       double timestamp,
+                       int encoded_data_length);
+
+ private:
+  std::shared_ptr<Network::Frontend> frontend_;
+  std::unordered_map<String, String> request_id_to_response_;
+};
+
+}  // namespace protocol
+}  // namespace inspector
+}  // namespace node
+
+#endif  // SRC_INSPECTOR_NETWORK_AGENT_H_

src/inspector/node_inspector.gypi

@@ -23,6 +23,8 @@
       'src/inspector/tracing_agent.h',
       'src/inspector/worker_agent.cc',
       'src/inspector/worker_agent.h',
+      'src/inspector/network_agent.cc',
+      'src/inspector/network_agent.h',
       'src/inspector/worker_inspector.cc',
       'src/inspector/worker_inspector.h',
     ],
@@ -36,6 +38,8 @@
       '<(SHARED_INTERMEDIATE_DIR)/src/node/inspector/protocol/NodeTracing.h',
       '<(SHARED_INTERMEDIATE_DIR)/src/node/inspector/protocol/NodeRuntime.cpp',
       '<(SHARED_INTERMEDIATE_DIR)/src/node/inspector/protocol/NodeRuntime.h',
+      '<(SHARED_INTERMEDIATE_DIR)/src/node/inspector/protocol/Network.cpp',
+      '<(SHARED_INTERMEDIATE_DIR)/src/node/inspector/protocol/Network.h',
     ],
     'node_protocol_files': [
       '<(protocol_tool_path)/lib/Allocator_h.template',

src/inspector/node_protocol.pdl

@@ -98,6 +98,71 @@ experimental domain NodeWorker
       SessionID sessionId
       string message
 
+# Partial support for Network domain of ChromeDevTools Protocol.
+# https://chromedevtools.github.io/devtools-protocol/tot/Network
+experimental domain Network
+  # Unique request identifier.
+  type RequestId extends string
+
+  # UTC time in seconds, counted from January 1, 1970.
+  type TimeSinceEpoch extends number
+
+  # Monotonically increasing time in seconds since an arbitrary point in the past.
+  type MonotonicTime extends number
+
+  # HTTP request data.
+  type Request extends object
+    properties
+      string url
+      string method
+
+  # Returns content served for the given request.
+  command getResponseBody
+    parameters
+      # Identifier of the network request to get content for.
+      RequestId requestId
+    returns
+      # Response body.
+      string body
+
+  # Fired when page is about to send HTTP request.
+  event requestWillBeSent
+    parameters
+      # Request identifier.
+      RequestId requestId
+      # Request data.
+      Request request
+      # Timestamp.
+      MonotonicTime timestamp
+      # Timestamp.
+      TimeSinceEpoch wallTime
+
+  # Fired when HTTP response is available.
+  event responseReceived
+    parameters
+      # Request identifier.
+      RequestId requestId
+      # Timestamp.
+      MonotonicTime timestamp
+
+  event dataReceived
+    parameters
+      # Request identifier.
+      RequestId requestId
+      # Timestamp.
+      MonotonicTime timestamp
+      # Data chunk length.
+      integer dataLength
+
+  event loadingFinished
+    parameters
+      # Request identifier.
+      RequestId requestId
+      # Timestamp.
+      MonotonicTime timestamp
+      # Total number of bytes received for this request.
+      number encodedDataLength
+
 # Support for inspecting node process state.
 experimental domain NodeRuntime
   # Enable the NodeRuntime events except by `NodeRuntime.waitingForDisconnect`.

src/inspector/node_string.cc

@@ -84,7 +84,7 @@ String StringViewToUtf8(v8_inspector::StringView view) {
 String fromDouble(double d) {
   std::ostringstream stream;
   stream.imbue(std::locale::classic());  // Ignore current locale
-  stream << d;
+  stream << std::fixed << d;
   return stream.str();
 }