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class TestRequestHandler: CEFRequestHandler {
    func onGetResourceRequestHandler(browser: CEFBrowser, frame: CEFFrame, request: CEFRequest, isNavigation: Bool, isDownload: Bool, initiator: String, disableDefault: inout Bool) -> CEFResourceRequestHandler? {
        disableDefault = true
        return TestResourceRequestHandler()
    }
}

class TestResourceRequestHandler: CEFResourceRequestHandler {
    func cookieAccessFilter(browser: CEFBrowser?, frame: CEFFrame?, request: CEFRequest) -> CEFCookieAccessFilter? {
        return nil
    }
    
    func resourceHandler(browser: CEFBrowser?, frame: CEFFrame?, request: CEFRequest) -> CEFResourceHandler? {
        return TestResourceHandler()
    }

    func onResourceLoadComplete(browser: CEFBrowser?, frame: CEFFrame?, request: CEFRequest, response: CEFResponse, status: CEFURLRequestStatus, contentLength: Int64) {
        print("Load Complete")
    }
}

class TestResourceHandler: CEFResourceHandler {
    var fileData:Data?
    var bytesDone:Int = 0
    
    func onOpenResponseStream(request: CEFRequest, callback: CEFCallback) -> CEFOnOpenResponseStreamAction {
        let fileManager = FileManager.default
        var filePath = Bundle.main.resourcePath!
        let url = request.url!.absoluteString
        let index = url.index(url.startIndex, offsetBy: "http://localhost".characters.count)
        
        filePath += url.substring(from:index)
        if fileManager.fileExists(atPath: filePath) {
            // Open the file
            let file = FileHandle(forReadingAtPath: filePath)
            fileData = file?.readDataToEndOfFile()
            // Close the file
            file?.closeFile()
        } else {
            print("File not found : " + filePath)
        }
        return .handle
    }

    
    func onGetResponseHeaders(response: CEFResponse) -> CEFOnGetResponseHeadersAction {
        if fileData != nil{
            response.status = 200;
            response.statusText = "OK";
            return .continueWithResponseLength(UInt64(fileData!.count))
        }
        return .abort
    }

    
    func onReadResponseData(buffer: UnsafeMutableRawPointer, bufferLength: Int, callback: CEFResourceReadCallback) -> CEFOnReadResponseDataAction {
        let nsData = fileData! as NSData
        let chunkSize = min(fileData!.count - bytesDone, bufferLength)
        if (chunkSize <= 0){
            return .complete
        }
        buffer.copyMemory(from: nsData.bytes.advanced(by: bytesDone), byteCount: chunkSize)
        bytesDone += chunkSize
        return .read(chunkSize)
    }
    
}

<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "Headers/CEFswift.h"
        ^
~/playground/CEF.swift/Samples/CEFDemo/Library/Release/CEFswift.framework/Headers/CEFswift.h:19:9: error: module 'ChromiumEmbedded' not found
@import ChromiumEmbedded;
        ^
<unknown>:0: error: could not build Objective-C module 'CEFswift'

$ carthage update
*** Fetching CEF.swift
*** Checking out CEF.swift at "394a73be54e67fe3f940ba161dd21c501dced756"
*** xcodebuild output can be found in /var/folders/5k/4vq3cwgd0_95wnn91bn_15n80000gn/T/carthage-xcodebuild.WJrjb3.log
*** Building scheme "CEF.swift" in CEF.swift.xcodeproj
Build Failed
	Task failed with exit code 65:
	/usr/bin/xcrun xcodebuild -project /Users/andys/CEF.swift/Carthage/Checkouts/CEF.swift/CEF.swift.xcodeproj -scheme CEF.swift -configuration Release -derivedDataPath /Users/andys/Library/Caches/org.carthage.CarthageKit/DerivedData/CEF.swift/394a73be54e67fe3f940ba161dd21c501dced756 ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= CARTHAGE=YES clean build (launched in /Users/andys/CEF.swift/Carthage/Checkouts/CEF.swift)

This usually indicates that project itself failed to compile. Please check the xcodebuild log for more details: /var/folders/5k/4vq3cwgd0_95wnn91bn_15n80000gn/T/carthage-xcodebuild.WJrjb3.log

$ sudo scripts/setup.sh
Password:
+ '[' '' = true ']'
++ git rev-parse --abbrev-ref HEAD
+ BRANCH=cef_3071
+ '[' cef '!=' cef ']'
+ CEF_BRANCH=3071
++ which 7z
+ '[' -z /usr/local/bin/7z ']'
++ which jq
+ '[' -z /usr/local/bin/jq ']'
++ which cmake
+ '[' -z /usr/local/bin/cmake ']'
+ echo 'Fetching binary distribution...'
Fetching binary distribution...
++ curl http://opensource.spotify.com/cefbuilds/index.html
++ scripts/cefbuilds_spotify.py -x --platforms=macosx64 --branches=3071 -
++ jq '."macosx64"."3071"'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0Traceback (most recent call last):
  File "scripts/cefbuilds_spotify.py", line 9, in <module>
    from lxml import html
ImportError: No module named lxml
  4 1623k    4 82536    0     0  1587k      0  0:00:01 --:--:--  0:00:01 1612k
curl: (23) Failed writing body (0 != 1448)
+ CEFBUILD_DESCRIPTOR=
++ echo
++ jq .dists.standard
++ tr -d '"'
+ CEFBUILD_URL=
++ echo
++ jq .delta
++ tr -d '"'
+ CEFBUILD_VERSION=3071.
++ mktemp -d /tmp/cefbuild.XXX
+ CEFBUILD_TEMP=/tmp/cefbuild.Rhv
+ CEFBUILD_TEMP_PATH=/tmp/cefbuild.Rhv/3071..tar.bz2
+ curl '' -k -o /tmp/cefbuild.Rhv/3071..tar.bz2
curl: (3) <url> malformed
+ echo 'Extracting package...'
Extracting package...
+ mkdir -p External
+ tar xzf /tmp/cefbuild.Rhv/3071..tar.bz2 -C External
tar: Error opening archive: Failed to open '/tmp/cefbuild.Rhv/3071..tar.bz2'
++ tar -tzf /tmp/cefbuild.Rhv/3071..tar.bz2
++ head -1
++ tr -d /
tar: Error opening archive: Failed to open '/tmp/cefbuild.Rhv/3071..tar.bz2'
+ CEFBUILD_DIR_NAME=
+ rm -rf /tmp/cefbuild.Rhv
+ '[' -e External/cef_binary ']'
+ ln -s '' External/cef_binary
ln: External/cef_binary: Invalid argument
+ pushd .
~/CEF.swift ~/CEF.swift
+ cd External/cef_binary
scripts/setup.sh: line 64: cd: External/cef_binary: No such file or directory
+ cmake -G Xcode
CMake Error: The source directory "/Users/andys/CEF.swift" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
+ set -o pipefail
+ xcodebuild clean build -project cef.xcodeproj -target 'cefsimple Helper' -arch x86_64 -configuration Debug
+ xcpretty -c
scripts/setup.sh: line 66: xcpretty: command not found
xcodebuild: error: 'cef.xcodeproj' does not exist.
+ set -o pipefail
+ xcodebuild clean build -project cef.xcodeproj -target 'cefsimple Helper' -arch x86_64 -configuration Release
+ xcpretty -c
scripts/setup.sh: line 67: xcpretty: command not found
xcodebuild: error: 'cef.xcodeproj' does not exist.
+ popd
~/CEF.swift

let val = CEFV8Value.createString("")
print(val.stringValue)

class CustomCEFApp: CEFApp, CEFRenderProcessHandler {
  var renderProcessHandler: CEFRenderProcessHandler? { return self }
  func onContextCreated(browser: CEFBrowser, frame: CEFFrame, context: CEFV8Context) {
     print("ContextCreated")
  }
}

var settings = CEFSettings()
settings.useSingleProcess = true

_ = CEFProcessUtils.initializeMain(
  with: CEFMainArgs(arguments: CommandLine.arguments),
  settings: settings,
  app: CustomCEFApp()
)

if request.postData != nil && request.postData!.elementCount == 1{
            let elements = request.postData!.elements
            print ("----> element.count : \(elements!.count) ---- elementCount : \(request.postData!.elementCount)  ---  \(request.postData!.hasExcludedElements)" )
}

func onOpenResponseStream(request: CEFRequest, callback: CEFCallback) -> CEFOnOpenResponseStreamAction {
    let fileManager = FileManager.default
    var filePath = Bundle.main.resourcePath!
    let url = request.url!.absoluteString
    let index = url.index(url.startIndex, offsetBy: "http://localhost".characters.count)
    
    filePath += url.substring(from:index)
    if fileManager.fileExists(atPath: filePath) {
        // Open the file
        let file = FileHandle(forReadingAtPath: filePath)
        fileData = file?.readDataToEndOfFile()
        // Close the file
        file?.closeFile()
    } else {
        print("File not found : " + filePath)
    }
    return .handle
}


func onGetResponseHeaders(response: CEFResponse) -> CEFOnGetResponseHeadersAction {
    if fileData != nil{
        response.status = 200;
        response.statusText = "OK";
        return .continueWithResponseLength(UInt64(fileData!.count)) // Here value = 96
    }
    return .abort
}


func onReadResponseData(buffer: UnsafeMutableRawPointer, bufferLength: Int, callback: CEFResourceReadCallback) -> CEFOnReadResponseDataAction {
   // Here bufferLength = 65536 expected -> 96
    let nsData = fileData! as NSData
    buffer.copyMemory(from: nsData.bytes.advanced(by: bytesDone), byteCount: bufferLength)
    bytesDone += bufferLength
    if bytesDone == UInt64(fileData!.count) {
        return .complete
    } else {
        return .read(bufferLength)
    }
}

class XXXResourceHandler: CEFResourceHandler{
    func onProcessRequest(request: CEFRequest, callback: CEFCallback) -> CEFOnProcessRequestAction{
        print("XXXResourceHandler : onProcessRequest")
        callback.doContinue()
        return .allow
    }
    
    func onGetResponseHeaders(response: CEFResponse) -> CEFOnGetResponseHeadersAction {
        print("XXXResourceHandler : onGetResponseHeaders")
        response.status = 404
        response.statusText = "Not Found"
        print ("status after : " + String(response.status));
        print ("status text after : " + String(response.statusText));
        response.mimeType = "text/html"
        return .continueWithResponseLength(0)
    }
    
    func onReadResponse(buffer: UnsafeMutableRawPointer,bufferLength: Int, callback: CEFCallback) -> CEFOnReadResponseAction{
        print("XXXResourceHandler : onReadResponse")
        
        return .read(0)
    }
}

XXXResourceHandler : onProcessRequest
XXXResourceHandler : onGetResponseHeaders
status after : 0
status text after : Not Found

[0428/182914.654404:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 1 time(s)
[0428/182914.656717:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 2 time(s)
[0428/182914.658700:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 3 time(s)
[0428/182914.660397:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 4 time(s)
[0428/182914.662200:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 5 time(s)
[0428/182914.664022:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 6 time(s)
[0428/182914.665793:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 7 time(s)
2020-04-28 18:29:15.967900+0530 CEFDemo[11374:84964] Metal API Validation Enabled
Unable to create basic Accelerated OpenGL renderer.
Unable to create basic Accelerated OpenGL renderer.
Core Image is now using the software OpenGL renderer. This will be slow.
[0428/182917.408874:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 8 time(s)
2020-04-28 18:29:18.369486+0530 CEFDemo[11374:84964] [logging-persist] cannot open file at line 43353 of [378230ae7f]
2020-04-28 18:29:18.369950+0530 CEFDemo[11374:84964] [logging-persist] os_unix.c:43353: (0) open(/var/db/DetachedSignatures) - Undefined error: 0
[0428/182918.874837:WARNING:gpu_process_host.cc(1220)] The GPU process has crashed 9 time(s)
[0428/182918.874942:FATAL:gpu_data_manager_impl_private.cc(986)] The display compositor is frequently crashing. Goodbye.

Thread 15 Crashed:: Chrome_IOThread
0   me.cocoagrinder.CEF-swift     	0x00000001075cac86 _TTSf4n_d___TZFV8CEFswift13CEFWindowInfo7fromCEFfVSC18_cef_window_info_tS0_ + 278 (CEFString.swift:12)
1   me.cocoagrinder.CEF-swift     	0x00000001073aca76 _TF8CEFswift34CEFLifeSpanHandler_on_before_popupFT3ptrGSqGSpVSC24_cef_life_span_handler_t__7browserGSqGSpVSC14_cef_browser_t__5frameGSqGSpVSC12_cef_frame_t__3urlGSqGSPVSC19_cef_string_utf16_t__9frameNameGSqGSPS3___11dispositionVSC29cef_window_open_disposition_t11userGestureVs5Int328featuresGSqGSPVSC21_cef_popup_features_t__10windowInfoGSqGSpVSC18_cef_window_info_t__9cefClientGSqGSpGSqGSpVSC13_cef_client_t____11cefSettingsGSqGSpVSC23_cef_browser_settings_t__10noJSAccessGSqGSpS5____S5_ + 454
2   org.chromium.ContentShell.framework	0x000000010c07de6b CefLifeSpanHandlerCToCpp::OnBeforePopup(scoped_refptr<CefBrowser>, scoped_refptr<CefFrame>, CefStringBase<CefStringTraitsUTF16> const&, CefStringBase<CefStringTraitsUTF16> const&, cef_window_open_disposition_t, bool, CefStructBase<CefPopupFeaturesTraits> const&, CefWindowInfo&, scoped_refptr<CefClient>&, CefStructBase<CefBrowserSettingsTraits>&, bool*) + 795 (life_span_handler_ctocpp.cc:57)
3   org.chromium.ContentShell.framework	0x000000010da914c3 CefBrowserInfoManager::CanCreateWindow(GURL const&, content::Referrer const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, WindowOpenDisposition, blink::mojom::WindowFeatures const&, bool, bool, int, int, bool*) + 2323 (browser_info_manager.cc:213)
4   org.chromium.ContentShell.framework	0x000000010da9d0f9 CefContentBrowserClient::CanCreateWindow(int, int, GURL const&, GURL const&, GURL const&, content::mojom::WindowContainerType, GURL const&, content::Referrer const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, WindowOpenDisposition, blink::mojom::WindowFeatures const&, bool, bool, content::ResourceContext*, bool*) + 185 (content_browser_client.cc:860)
5   org.chromium.ContentShell.framework	0x000000010d3bab7a content::RenderMessageFilter::CreateNewWindow(mojo::StructPtr<content::mojom::CreateNewWindowParams>, base::Callback<void (mojo::InlinedStructPtr<content::mojom::CreateNewWindowReply>), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) + 794 (render_message_filter.cc:217)
6   org.chromium.ContentShell.framework	0x000000010cd76e34 content::mojom::RenderMessageFilterStubDispatch::AcceptWithResponder(content::mojom::RenderMessageFilter*, mojo::Message*, mojo::MessageReceiverWithStatus*) + 1988 (render_message_filter.mojom.cc:1212)
7   org.chromium.ContentShell.framework	0x000000010e7bdc83 mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) + 723
8   org.chromium.ContentShell.framework	0x000000010e7bd736 mojo::FilterChain::Accept(mojo::Message*) + 150 (filter_chain.cc:40)
9   org.chromium.ContentShell.framework	0x000000010e7bee55 mojo::InterfaceEndpointClient::HandleIncomingMessage(mojo::Message*) + 117 (interface_endpoint_client.cc:295)
10  org.chromium.ContentShell.framework	0x000000010e7a9f4e IPC::(anonymous namespace)::ChannelAssociatedGroupController::Accept(mojo::Message*) + 606 (ipc_mojo_bootstrap.cc:755)
11  org.chromium.ContentShell.framework	0x000000010e7bd736 mojo::FilterChain::Accept(mojo::Message*) + 150 (filter_chain.cc:40)
12  org.chromium.ContentShell.framework	0x000000010e7bbecb mojo::Connector::ReadSingleMessage(unsigned int*) + 123 (connector.cc:258)
13  org.chromium.ContentShell.framework	0x000000010e7bc2e1 mojo::Connector::OnHandleReadyInternal(unsigned int) + 177 (connector.cc:214)
14  org.chromium.ContentShell.framework	0x000000010e7d1be6 mojo::Watcher::OnHandleReady(unsigned int) + 278 (heap_profiler.h:54)
15  org.chromium.ContentShell.framework	0x000000010e7d1d0b void base::internal::FunctorTraits<void (mojo::Watcher::*)(unsigned int), void>::Invoke<base::WeakPtr<mojo::Watcher> const&, unsigned int const&>(void (mojo::Watcher::*)(unsigned int), base::WeakPtr<mojo::Watcher> const&&&, unsigned int const&&&) + 155 (bind_internal.h:215)
16  org.chromium.ContentShell.framework	0x000000010dd20075 base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) + 309 (task_annotator.cc:59)
17  org.chromium.ContentShell.framework	0x000000010dd55179 base::MessageLoop::RunTask(base::PendingTask*) + 441 (message_loop.cc:421)
18  org.chromium.ContentShell.framework	0x000000010dd5553c base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) + 44 (message_loop.cc:431)
19  org.chromium.ContentShell.framework	0x000000010dd559d3 base::MessageLoop::DoWork() + 483 (message_loop.cc:524)
20  org.chromium.ContentShell.framework	0x000000010dd59405 base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) + 245 (message_pump_libevent.cc:219)
21  org.chromium.ContentShell.framework	0x000000010dd54e3b base::MessageLoop::RunHandler() + 235 (message_loop.cc:385)
22  org.chromium.ContentShell.framework	0x000000010dd7e7c7 base::RunLoop::Run() + 151 (run_loop.cc:38)