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cprotocolbridge.cpp
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cprotocolbridge.cpp
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#include "precomp.h"
HRESULT CProtocolBridge::PostponeProcessing(CNodeHttpStoredContext* context, DWORD dueTime)
{
CAsyncManager* async = context->GetNodeApplication()->GetApplicationManager()->GetAsyncManager();
LARGE_INTEGER delay;
delay.QuadPart = dueTime;
delay.QuadPart *= -10000; // convert from ms to 100ns units
return async->SetTimer(context->GetAsyncContext(), &delay);
}
#define LOCAL127 0x0100007F // 127.0.0.1
BOOL CProtocolBridge::IsLocalCall(IHttpContext* ctx)
{
PSOCKADDR src = ctx->GetRequest()->GetRemoteAddress();
PSOCKADDR dest = ctx->GetRequest()->GetLocalAddress();
if (AF_INET == src->sa_family && AF_INET == dest->sa_family)
{
DWORD srcAddress = ntohl(((PSOCKADDR_IN)src)->sin_addr.s_addr);
DWORD destAddress = ntohl(((PSOCKADDR_IN)dest)->sin_addr.s_addr);
return srcAddress == destAddress || LOCAL127 == srcAddress || LOCAL127 == destAddress;
}
else if (AF_INET6 == src->sa_family && AF_INET6 == dest->sa_family)
{
IN6_ADDR* srcAddress = &((PSOCKADDR_IN6)src)->sin6_addr;
IN6_ADDR* destAddress = &((PSOCKADDR_IN6)dest)->sin6_addr;
if (0 == memcmp(srcAddress, destAddress, sizeof IN6_ADDR))
{
return TRUE;
}
if (IN6_IS_ADDR_LOOPBACK(srcAddress) || IN6_IS_ADDR_LOOPBACK(destAddress))
{
return TRUE;
}
}
return FALSE;
}
BOOL CProtocolBridge::SendIisnodeError(IHttpContext* httpCtx, HRESULT hr)
{
if (IISNODE_ERROR_UNABLE_TO_READ_CONFIGURATION == hr)
{
if (CProtocolBridge::IsLocalCall(httpCtx))
{
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"iisnode was unable to read the configuration file. Make sure the web.config file syntax is correct. In particular, verify the "
" <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"iisnode configuration section</a> matches the expected schema. The schema of the iisnode section that your version of iisnode requiries is stored in the "
"%systemroot%\\system32\\inetsrv\\config\\schema\\iisnode_schema.xml file.");
return TRUE;
}
else
{
return FALSE;
}
}
if (!CModuleConfiguration::GetDevErrorsEnabled(httpCtx))
{
return FALSE;
}
switch (hr) {
default:
return FALSE;
case IISNODE_ERROR_UNRECOGNIZED_DEBUG_COMMAND:
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"Unrecognized debugging command. Supported commands are ?debug (default), ?brk, and ?kill.");
break;
case IISNODE_ERROR_UNABLE_TO_FIND_DEBUGGING_PORT:
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"The debugger was unable to acquire a TCP port to establish communication with the debugee. "
"This may be due to lack of free TCP ports in the range specified in the <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"system.webServer/iisnode/@debuggerPortRange</a> configuration "
"section, or due to lack of permissions to create TCP listeners by the identity of the IIS worker process.");
break;
case IISNODE_ERROR_UNABLE_TO_CONNECT_TO_DEBUGEE:
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"The debugger was unable to connect to the the debugee. "
"This may be due to the debugee process terminating during startup (e.g. due to an unhandled exception) or "
"failing to establish a TCP listener on the debugging port. ");
break;
case IISNODE_ERROR_INSPECTOR_NOT_FOUND:
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"The version of iisnode installed on the server does not support remote debugging. "
"To use remote debugging, please update your iisnode installation on the server to one available from "
"<a href=""http://github.com/tjanczuk/iisnode/downloads"">http://github.com/tjanczuk/iisnode/downloads</a>. "
"We apologize for inconvenience.");
break;
case IISNODE_ERROR_UNABLE_TO_CREATE_LOG_FILE:
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"The iisnode module is unable to create a log file to capture stdout and stderr output from node.exe. "
"Please check that the identity of the IIS application pool running the node.js application has read and write access "
"permissions to the directory on the server where the node.js application is located. Alternatively you can disable logging "
"by setting <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"system.webServer/iisnode/@loggingEnabled</a> element of web.config to 'false'.");
break;
case IISNODE_ERROR_UNABLE_TO_CREATE_DEBUGGER_FILES:
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
"The iisnode module is unable to deploy supporting files necessary to initialize the debugger. "
"Please check that the identity of the IIS application pool running the node.js application has read and write access "
"permissions to the directory on the server where the node.js application is located.");
break;
case IISNODE_ERROR_UNABLE_TO_START_NODE_EXE:
LPCTSTR commandLine = CModuleConfiguration::GetNodeProcessCommandLine(httpCtx);
char* errorMessage;
if (NULL == (errorMessage = (char*)httpCtx->AllocateRequestMemory(strlen(commandLine) + 512)))
{
errorMessage =
"The iisnode module is unable to start the node.exe process. Make sure the node.exe executable is available "
"at the location specified in the <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"system.webServer/iisnode/@nodeProcessCommandLine</a> element of web.config. "
"By default node.exe is expected to be installed in %ProgramFiles%\\nodejs folder on x86 systems and "
"%ProgramFiles(x86)%\\nodejs folder on x64 systems.";
}
else
{
sprintf(errorMessage,
"The iisnode module is unable to start the node.exe process. Make sure the node.exe executable is available "
"at the location specified in the <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"system.webServer/iisnode/@nodeProcessCommandLine</a> element of web.config. "
"The command line iisnode attempted to run was:<br><br>%s", commandLine);
}
CProtocolBridge::SendSyncResponse(
httpCtx,
200,
"OK",
hr,
TRUE,
errorMessage);
break;
};
return TRUE;
}
BOOL CProtocolBridge::SendIisnodeError(CNodeHttpStoredContext* ctx, HRESULT hr)
{
if (CProtocolBridge::SendIisnodeError(ctx->GetHttpContext(), hr))
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode request processing failed for reasons recognized by iisnode", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
if (INVALID_HANDLE_VALUE != ctx->GetPipe())
{
CloseHandle(ctx->GetPipe());
ctx->SetPipe(INVALID_HANDLE_VALUE);
}
CProtocolBridge::FinalizeResponseCore(
ctx,
RQ_NOTIFICATION_FINISH_REQUEST,
hr,
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider(),
L"iisnode posts completion from SendIisnodeError",
WINEVENT_LEVEL_VERBOSE);
return TRUE;
}
return FALSE;
}
BOOL CProtocolBridge::SendDevError(CNodeHttpStoredContext* context, USHORT status, PCTSTR reason, HRESULT hresult, BOOL disableCache)
{
HRESULT hr;
DWORD rawLogSize, htmlLogSize, htmlTotalSize;
IHttpContext* ctx;
char* rawLog;
char* templ1;
char* html;
char* current;
if (500 <= status && CModuleConfiguration::GetDevErrorsEnabled(context->GetHttpContext()) && NULL != context->GetNodeProcess())
{
// return a friendly HTTP 200 response with HTML entity body that contains error details
// and the content of node.exe stdout/err, if available
ctx = context->GetHttpContext();
rawLog = context->GetNodeProcess()->TryGetLog(ctx, &rawLogSize);
templ1 =
"<p>iisnode encountered an error when processing the request.</p><pre style=\"background-color: eeeeee\">"
"HRESULT: 0x%x\n"
"HTTP status: %d\n"
"HTTP reason: %s</pre>"
"<p>You are receiving this HTTP 200 response because <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"system.webServer/iisnode/@devErrorsEnabled</a> configuration setting is 'true'.</p>"
"<p>In addition to the log of stdout and stderr of the node.exe process, consider using "
"<a href=""http://tomasz.janczuk.org/2011/11/debug-nodejs-applications-on-windows.html"">debugging</a> "
"and <a href=""http://tomasz.janczuk.org/2011/09/using-event-tracing-for-windows-to.html"">ETW traces</a> to further diagnose the problem.</p>";
// calculate HTML encoded size of the log
htmlLogSize = 0;
for (int i = 0; i < rawLogSize; i++)
{
if (rawLog[i] >= 0 && rawLog[i] <= 0x8
|| rawLog[i] >= 0xb && rawLog[i] <= 0xc
|| rawLog[i] >= 0xe && rawLog[i] <= 0x1f
|| rawLog[i] >= 0x80 && rawLog[i] <= 0x9f)
{
// characters disallowed in HTML will be converted to [xAB] notation, thus taking 5 bytes
htmlLogSize += 5;
}
else
{
switch (rawLog[i])
{
default:
htmlLogSize++;
break;
case '&':
htmlLogSize += 5; // &
break;
case '<':
case '>':
htmlLogSize += 4; // < >
break;
case '"':
case '\'':
htmlLogSize += 6; // " '
break;
};
}
}
// calculate total size of HTML and allocate memory
htmlTotalSize = strlen(templ1) + 20 /* hresult */ + 20 /* status code */ + strlen(reason) + 300 /* log content heading */ + htmlLogSize;
ErrorIf(NULL == (html = (char*)ctx->AllocateRequestMemory(htmlTotalSize)), ERROR_NOT_ENOUGH_MEMORY);
RtlZeroMemory(html, htmlTotalSize);
// construct the HTML
sprintf(html, templ1, hresult, status, reason);
if (0 == rawLogSize)
{
if (CModuleConfiguration::GetLoggingEnabled(ctx))
{
strcat(html, "<p>The node.exe process has not written any information to the stdout or stderr.</p>");
}
else
{
strcat(html, "<p>You may get additional information about this error condition by logging stdout and stderr of the node.exe process."
"To enable logging, set the <a href=""https://github.com/tjanczuk/iisnode/blob/master/src/samples/configuration/web.config"">"
"system.webServer/iisnode/@loggingEnabled</a> configuration setting to 'true' (current value is 'false').</p>");
}
}
else
{
strcat(html, "<p>The last 64k of the output generated by the node.exe process to stdout and stderr is shown below:</p><pre style=\"background-color: eeeeee\">");
current = html + strlen(html);
if (htmlLogSize == rawLogSize)
{
// no HTML encoding is necessary
memcpy(current, rawLog, rawLogSize);
}
else
{
// HTML encode the log
for (int i = 0; i < rawLogSize; i++)
{
if (rawLog[i] >= 0 && rawLog[i] <= 0x8
|| rawLog[i] >= 0xb && rawLog[i] <= 0xc
|| rawLog[i] >= 0xe && rawLog[i] <= 0x1f
|| rawLog[i] >= 0x80 && rawLog[i] <= 0x9f)
{
// characters disallowed in HTML are converted to [xAB] notation
*current++ = '[';
*current++ = 'x';
*current = rawLog[i] >> 4;
*current++ += *current > 9 ? 'A' - 10 : '0';
*current = rawLog[i] & 15;
*current++ += *current > 9 ? 'A' - 10 : '0';
*current++ = ']';
}
else
{
switch (rawLog[i])
{
default:
*current++ = rawLog[i];
break;
case '&':
*current++ = '&';
*current++ = 'a';
*current++ = 'm';
*current++ = 'p';
*current++ = ';';
break;
case '<':
*current++ = '&';
*current++ = 'l';
*current++ = 't';
*current++ = ';';
break;
case '>':
*current++ = '&';
*current++ = 'g';
*current++ = 't';
*current++ = ';';
break;
case '"':
*current++ = '&';
*current++ = 'q';
*current++ = 'u';
*current++ = 'o';
*current++ = 't';
*current++ = ';';
break;
case '\'':
*current++ = '&';
*current++ = 'a';
*current++ = 'p';
*current++ = 'o';
*current++ = 's';
*current++ = ';';
break;
};
}
}
}
}
// send the response
CheckError(CProtocolBridge::SendSyncResponse(
ctx,
200,
"OK",
hresult,
TRUE,
html));
return true;
}
Error:
return false;
}
HRESULT CProtocolBridge::SendEmptyResponse(CNodeHttpStoredContext* context, USHORT status, PCTSTR reason, HRESULT hresult, BOOL disableCache)
{
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode request processing failed for reasons unrecognized by iisnode", WINEVENT_LEVEL_VERBOSE, context->GetActivityId());
if (INVALID_HANDLE_VALUE != context->GetPipe())
{
CloseHandle(context->GetPipe());
context->SetPipe(INVALID_HANDLE_VALUE);
}
if (!CProtocolBridge::SendDevError(context, status, reason, hresult, disableCache))
{
// return default IIS response
CProtocolBridge::SendEmptyResponse(context->GetHttpContext(), status, reason, hresult, disableCache);
}
CProtocolBridge::FinalizeResponseCore(
context,
RQ_NOTIFICATION_FINISH_REQUEST,
hresult,
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider(),
L"iisnode posts completion from SendEmtpyResponse",
WINEVENT_LEVEL_VERBOSE);
return S_OK;
}
HRESULT CProtocolBridge::SendSyncResponse(IHttpContext* httpCtx, USHORT status, PCTSTR reason, HRESULT hresult, BOOL disableCache, PCSTR htmlBody)
{
HRESULT hr;
DWORD bytesSent;
HTTP_DATA_CHUNK body;
CProtocolBridge::SendEmptyResponse(httpCtx, status, reason, hresult, disableCache);
IHttpResponse* response = httpCtx->GetResponse();
response->SetHeader(HttpHeaderContentType, "text/html", 9, TRUE);
body.DataChunkType = HttpDataChunkFromMemory;
body.FromMemory.pBuffer = (PVOID)htmlBody;
body.FromMemory.BufferLength = strlen(htmlBody);
CheckError(response->WriteEntityChunks(&body, 1, FALSE, FALSE, &bytesSent));
return S_OK;
Error:
return hr;
}
void CProtocolBridge::SendEmptyResponse(IHttpContext* httpCtx, USHORT status, PCTSTR reason, HRESULT hresult, BOOL disableCache)
{
if (!httpCtx->GetResponseHeadersSent())
{
httpCtx->GetResponse()->Clear();
httpCtx->GetResponse()->SetStatus(status, reason, 0, hresult);
if (disableCache)
{
httpCtx->GetResponse()->SetHeader(HttpHeaderCacheControl, "no-cache", 8, TRUE);
}
}
}
HRESULT CProtocolBridge::InitiateRequest(CNodeHttpStoredContext* context)
{
HRESULT hr;
BOOL requireChildContext = FALSE;
BOOL mainDebuggerPage = FALSE;
IHttpContext* child = NULL;
BOOL completionExpected;
// determine what the target path of the request is
if (context->GetNodeApplication()->IsDebugger())
{
// All debugger URLs require rewriting. Requests for static content will be processed using a child http context and served
// by a static file handler. Debugging protocol requests will continue executing in the current context and be processed
// by the node-inspector application.
CheckError(CNodeDebugger::DispatchDebuggingRequest(context, &requireChildContext, &mainDebuggerPage));
}
else
{
// For application requests, if the URL rewrite module had been used to rewrite the URL,
// present the original URL to the node.js application instead of the re-written one.
PCSTR url;
USHORT urlLength;
IHttpRequest* request = context->GetHttpContext()->GetRequest();
if (NULL == (url = request->GetHeader("X-Original-URL", &urlLength)))
{
HTTP_REQUEST* raw = request->GetRawHttpRequest();
context->SetTargetUrl(raw->pRawUrl, raw->RawUrlLength);
}
else
{
context->SetTargetUrl(url, urlLength);
}
}
// determine how to process the request
if (requireChildContext)
{
CheckError(context->GetHttpContext()->CloneContext(CLONE_FLAG_BASICS | CLONE_FLAG_ENTITY | CLONE_FLAG_HEADERS, &child));
if (mainDebuggerPage)
{
// Prevent client caching of responses to requests for debugger entry points e.g. app.js/debug or app.js/debug?brk
// This is to allow us to run initialization logic on the server if necessary every time user refreshes the page
// Static content subordinate to the main debugger page is eligible for client side caching
child->GetResponse()->SetHeader(HttpHeaderCacheControl, "no-cache", 8, TRUE);
}
CheckError(child->GetRequest()->SetUrl(context->GetTargetUrl(), context->GetTargetUrlLength(), FALSE));
context->SetChildContext(child);
context->SetNextProcessor(CProtocolBridge::ChildContextCompleted);
CheckError(context->GetHttpContext()->ExecuteRequest(TRUE, child, 0, NULL, &completionExpected));
if (!completionExpected)
{
CProtocolBridge::ChildContextCompleted(S_OK, 0, context->GetOverlapped());
}
}
else
{
context->SetNextProcessor(CProtocolBridge::CreateNamedPipeConnection);
CProtocolBridge::CreateNamedPipeConnection(S_OK, 0, context->InitializeOverlapped());
}
return S_OK;
Error:
if (child)
{
child->ReleaseClonedContext();
child = NULL;
context->SetChildContext(NULL);
}
return hr;
}
void WINAPI CProtocolBridge::ChildContextCompleted(DWORD error, DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
CNodeHttpStoredContext* ctx = CNodeHttpStoredContext::Get(overlapped);
ctx->GetChildContext()->ReleaseClonedContext();
ctx->SetChildContext(NULL);
if (S_OK == error)
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode finished processing child http request", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
}
else
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode failed to process child http request", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
}
ctx->SetHresult(error);
ctx->SetRequestNotificationStatus(RQ_NOTIFICATION_CONTINUE);
ctx->SetNextProcessor(NULL);
CProtocolBridge::FinalizeResponseCore(
ctx,
RQ_NOTIFICATION_CONTINUE,
error,
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider(),
L"iisnode posts completion from ChildContextCompleted",
WINEVENT_LEVEL_VERBOSE);
return;
}
void WINAPI CProtocolBridge::CreateNamedPipeConnection(DWORD error, DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
HRESULT hr;
CNodeHttpStoredContext* ctx = CNodeHttpStoredContext::Get(overlapped);
HANDLE pipe = INVALID_HANDLE_VALUE;
DWORD retry = ctx->GetConnectionRetryCount();
if (0 == retry)
{
// only the first connection attempt uses connections from the pool
pipe = ctx->GetNodeProcess()->GetConnectionPool()->Take();
}
if (INVALID_HANDLE_VALUE == pipe)
{
ErrorIf(INVALID_HANDLE_VALUE == (pipe = CreateFile(
ctx->GetNodeProcess()->GetNamedPipeName(),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
NULL)),
GetLastError());
ErrorIf(!SetFileCompletionNotificationModes(
pipe,
FILE_SKIP_COMPLETION_PORT_ON_SUCCESS | FILE_SKIP_SET_EVENT_ON_HANDLE),
GetLastError());
ctx->SetIsConnectionFromPool(FALSE);
ctx->GetNodeApplication()->GetApplicationManager()->GetAsyncManager()->AddAsyncCompletionHandle(pipe);
}
else
{
ctx->SetIsConnectionFromPool(TRUE);
}
ctx->SetPipe(pipe);
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode created named pipe connection to the node.exe process", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
CProtocolBridge::SendHttpRequestHeaders(ctx);
return;
Error:
if (INVALID_HANDLE_VALUE == pipe)
{
if (retry >= CModuleConfiguration::GetMaxNamedPipeConnectionRetry(ctx->GetHttpContext()))
{
if (hr == ERROR_PIPE_BUSY)
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode was unable to establish named pipe connection to the node.exe process because the named pipe server is too busy", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
CProtocolBridge::SendEmptyResponse(ctx, 503, _T("Service Unavailable"), hr);
}
else
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode was unable to establish named pipe connection to the node.exe process", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
CProtocolBridge::SendEmptyResponse(ctx, 500, _T("Internal Server Error"), hr);
}
}
else
{
ctx->SetConnectionRetryCount(retry + 1);
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode scheduled a retry of a named pipe connection to the node.exe process ", WINEVENT_LEVEL_INFO, ctx->GetActivityId());
CProtocolBridge::PostponeProcessing(ctx, CModuleConfiguration::GetNamedPipeConnectionRetryDelay(ctx->GetHttpContext()));
}
}
else
{
CloseHandle(pipe);
pipe = INVALID_HANDLE_VALUE;
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode was unable to configure the named pipe connection to the node.exe process", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
CProtocolBridge::SendEmptyResponse(ctx, 500, _T("Internal Server Error"), hr);
}
return;
}
void CProtocolBridge::SendHttpRequestHeaders(CNodeHttpStoredContext* context)
{
HRESULT hr;
DWORD length;
IHttpRequest *request;
// capture ETW provider since after a successful call to WriteFile the context may be asynchronously deleted
CNodeEventProvider* etw = context->GetNodeApplication()->GetApplicationManager()->GetEventProvider();
GUID activityId;
memcpy(&activityId, context->GetActivityId(), sizeof GUID);
// request the named pipe to be kept alive by the server after the response is sent
// to enable named pipe connection pooling
request = context->GetHttpContext()->GetRequest();
CheckError(request->SetHeader(HttpHeaderConnection, "keep-alive", 10, TRUE));
// Expect: 100-continue has been processed by IIS - do not propagate it up to node.js since node will
// attempt to process it again
USHORT expectLength;
PCSTR expect = request->GetHeader(HttpHeaderExpect, &expectLength);
if (NULL != expect && 0 == strnicmp(expect, "100-continue", expectLength))
{
CheckError(request->DeleteHeader(HttpHeaderExpect));
}
CheckError(CHttpProtocol::SerializeRequestHeaders(context, context->GetBufferRef(), context->GetBufferSizeRef(), &length));
context->SetNextProcessor(CProtocolBridge::SendHttpRequestHeadersCompleted);
if (WriteFile(context->GetPipe(), context->GetBuffer(), length, NULL, context->InitializeOverlapped()))
{
// completed synchronously
etw->Log(L"iisnode initiated sending http request headers to the node.exe process and completed synchronously",
WINEVENT_LEVEL_VERBOSE,
&activityId);
// despite IO completion ports are used, asynchronous callback will not be invoked because in
// CProtocolBridge:CreateNamedPipeConnection the SetFileCompletionNotificationModes function was called
// - see http://msdn.microsoft.com/en-us/library/windows/desktop/aa365683(v=vs.85).aspx
// and http://msdn.microsoft.com/en-us/library/windows/desktop/aa365538(v=vs.85).aspx
CProtocolBridge::SendHttpRequestHeadersCompleted(S_OK, 0, context->GetOverlapped());
}
else
{
hr = GetLastError();
if (ERROR_IO_PENDING == hr)
{
// will complete asynchronously
etw->Log(L"iisnode initiated sending http request headers to the node.exe process and will complete asynchronously",
WINEVENT_LEVEL_VERBOSE,
&activityId);
}
else
{
// error
if (context->GetIsConnectionFromPool())
{
// communication over a connection from the connection pool failed
// try to create a brand new connection instead
context->SetConnectionRetryCount(1);
CProtocolBridge::CreateNamedPipeConnection(S_OK, 0, context->GetOverlapped());
}
else
{
etw->Log(L"iisnode failed to initiate sending http request headers to the node.exe process",
WINEVENT_LEVEL_ERROR,
&activityId);
CProtocolBridge::SendEmptyResponse(context, 500, _T("Internal Server Error"), hr);
}
}
}
return;
Error:
etw->Log(L"iisnode failed to serialize http request headers",
WINEVENT_LEVEL_ERROR,
&activityId);
CProtocolBridge::SendEmptyResponse(context, 500, _T("Internal Server Error"), hr);
return;
}
void WINAPI CProtocolBridge::SendHttpRequestHeadersCompleted(DWORD error, DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
HRESULT hr;
CNodeHttpStoredContext* ctx = CNodeHttpStoredContext::Get(overlapped);
CheckError(error);
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode finished sending http request headers to the node.exe process", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
CProtocolBridge::ReadRequestBody(ctx);
return;
Error:
if (ctx->GetIsConnectionFromPool())
{
// communication over a connection from the connection pool failed
// try to create a brand new connection instead
ctx->SetConnectionRetryCount(1);
CProtocolBridge::CreateNamedPipeConnection(S_OK, 0, ctx->GetOverlapped());
}
else
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode failed to send http request headers to the node.exe process", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
CProtocolBridge::SendEmptyResponse(ctx, 500, _T("Internal Server Error"), hr);
}
return;
}
void CProtocolBridge::ReadRequestBody(CNodeHttpStoredContext* context)
{
HRESULT hr;
DWORD bytesReceived = 0;
BOOL completionPending = FALSE;
if (0 < context->GetHttpContext()->GetRequest()->GetRemainingEntityBytes())
{
context->SetNextProcessor(CProtocolBridge::ReadRequestBodyCompleted);
CheckError(context->GetHttpContext()->GetRequest()->ReadEntityBody(context->GetBuffer(), context->GetBufferSize(), TRUE, &bytesReceived, &completionPending));
}
if (!completionPending)
{
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode initiated reading http request body chunk and completed synchronously", WINEVENT_LEVEL_VERBOSE, context->GetActivityId());
CProtocolBridge::ReadRequestBodyCompleted(S_OK, bytesReceived, context->GetOverlapped());
}
else
{
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode initiated reading http request body chunk and will complete asynchronously", WINEVENT_LEVEL_VERBOSE, context->GetActivityId());
}
return;
Error:
if (HRESULT_FROM_WIN32(ERROR_HANDLE_EOF) == hr)
{
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode detected the end of the http request body", WINEVENT_LEVEL_VERBOSE, context->GetActivityId());
CProtocolBridge::StartReadResponse(context);
}
else
{
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode failed reading http request body", WINEVENT_LEVEL_ERROR, context->GetActivityId());
CProtocolBridge::SendEmptyResponse(context, 500, _T("Internal Server Error"), HRESULT_FROM_WIN32(hr));
}
return;
}
void WINAPI CProtocolBridge::ReadRequestBodyCompleted(DWORD error, DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
CNodeHttpStoredContext* ctx = CNodeHttpStoredContext::Get(overlapped);
if (S_OK == error && bytesTransfered > 0)
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode read a chunk of http request body", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
CProtocolBridge::SendRequestBody(ctx, bytesTransfered);
}
else if (ERROR_HANDLE_EOF == error || 0 == bytesTransfered)
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode detected the end of the http request body", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
CProtocolBridge::StartReadResponse(ctx);
}
else
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode failed reading http request body", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
CProtocolBridge::SendEmptyResponse(ctx, 500, _T("Internal Server Error"), error);
}
}
void CProtocolBridge::SendRequestBody(CNodeHttpStoredContext* context, DWORD chunkLength)
{
// capture ETW provider since after a successful call to WriteFile the context may be asynchronously deleted
CNodeEventProvider* etw = context->GetNodeApplication()->GetApplicationManager()->GetEventProvider();
GUID activityId;
memcpy(&activityId, context->GetActivityId(), sizeof GUID);
context->SetNextProcessor(CProtocolBridge::SendRequestBodyCompleted);
if (WriteFile(context->GetPipe(), context->GetBuffer(), chunkLength, NULL, context->InitializeOverlapped()))
{
// completed synchronously
etw->Log(L"iisnode initiated sending http request body chunk to the node.exe process and completed synchronously",
WINEVENT_LEVEL_VERBOSE,
&activityId);
// despite IO completion ports are used, asynchronous callback will not be invoked because in
// CProtocolBridge:CreateNamedPipeConnection the SetFileCompletionNotificationModes function was called
// - see http://msdn.microsoft.com/en-us/library/windows/desktop/aa365683(v=vs.85).aspx
// and http://msdn.microsoft.com/en-us/library/windows/desktop/aa365538(v=vs.85).aspx
CProtocolBridge::SendRequestBodyCompleted(S_OK, 0, context->GetOverlapped());
}
else
{
HRESULT hr = GetLastError();
if (ERROR_IO_PENDING == hr)
{
// will complete asynchronously
etw->Log(L"iisnode initiated sending http request body chunk to the node.exe process and will complete asynchronously",
WINEVENT_LEVEL_VERBOSE,
&activityId);
}
else if (ERROR_NO_DATA == hr)
{
// Node.exe has closed the named pipe. This means it does not expect any more request data, but it does not mean there is no response.
// This may happen even for POST requests if the node.js application does not register event handlers for the 'data' or 'end' request events.
// Ignore the write error and attempt to read the response instead (which might have been written by node.exe before the named pipe connection
// was closed).
etw->Log(L"iisnode detected the node.exe process closed the named pipe connection",
WINEVENT_LEVEL_VERBOSE,
&activityId);
CProtocolBridge::StartReadResponse(context);
}
else
{
// error
etw->Log(L"iisnode failed to initiate sending http request body chunk to the node.exe process",
WINEVENT_LEVEL_ERROR,
&activityId);
CProtocolBridge::SendEmptyResponse(context, 500, _T("Internal Server Error"), hr);
}
}
return;
}
void WINAPI CProtocolBridge::SendRequestBodyCompleted(DWORD error, DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
CNodeHttpStoredContext* ctx = CNodeHttpStoredContext::Get(overlapped);
if (S_OK == error)
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode finished sending http request body chunk to the node.exe process", WINEVENT_LEVEL_VERBOSE, ctx->GetActivityId());
CProtocolBridge::ReadRequestBody(ctx);
}
else
{
ctx->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode failed to send http request body chunk to the node.exe process", WINEVENT_LEVEL_ERROR, ctx->GetActivityId());
CProtocolBridge::SendEmptyResponse(ctx, 500, _T("Internal Server Error"), error);
}
}
void CProtocolBridge::StartReadResponse(CNodeHttpStoredContext* context)
{
context->SetDataSize(0);
context->SetParsingOffset(0);
context->SetNextProcessor(CProtocolBridge::ProcessResponseStatusLine);
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode starting to read http response", WINEVENT_LEVEL_VERBOSE, context->GetActivityId());
CProtocolBridge::ContinueReadResponse(context);
}
HRESULT CProtocolBridge::EnsureBuffer(CNodeHttpStoredContext* context)
{
HRESULT hr;
if (context->GetBufferSize() == context->GetDataSize())
{
// buffer is full
if (context->GetParsingOffset() > 0)
{
// remove already parsed data from buffer by moving unprocessed data to the front; this will free up space at the end
char* b = (char*)context->GetBuffer();
memcpy(b, b + context->GetParsingOffset(), context->GetDataSize() - context->GetParsingOffset());
}
else
{
// allocate more buffer memory
context->GetNodeApplication()->GetApplicationManager()->GetEventProvider()->Log(
L"iisnode allocating more buffer memory to handle http response", WINEVENT_LEVEL_VERBOSE, context->GetActivityId());
DWORD* bufferLength = context->GetBufferSizeRef();
void** buffer = context->GetBufferRef();
DWORD quota = CModuleConfiguration::GetMaxRequestBufferSize(context->GetHttpContext());
ErrorIf(*bufferLength >= quota, ERROR_NOT_ENOUGH_QUOTA);
void* newBuffer;
DWORD newBufferLength = *bufferLength * 2;
if (newBufferLength > quota)
{
newBufferLength = quota;
}
ErrorIf(NULL == (newBuffer = context->GetHttpContext()->AllocateRequestMemory(newBufferLength)), ERROR_NOT_ENOUGH_MEMORY);
memcpy(newBuffer, (char*)(*buffer) + context->GetParsingOffset(), context->GetDataSize() - context->GetParsingOffset());
*buffer = newBuffer;
*bufferLength = newBufferLength;
}
context->SetDataSize(context->GetDataSize() - context->GetParsingOffset());
context->SetParsingOffset(0);
}
return S_OK;
Error:
return hr;
}
void CProtocolBridge::ContinueReadResponse(CNodeHttpStoredContext* context)