Cronet library for desktop platforms

[Marshall Greenblatt]

Hi All,

Are there any plans currently to support Cronet [1] as a stand-alone library for desktop platforms (Linux, Windows, macOS) in addition to the already supported mobile platforms (Android, iOS)?

Thanks,

Marshall

[1] https://chromium.googlesource.com/chromium/src/+/lkgr/components/cronet/

[Misha Efimov]

Hi Marshall,

Currently Cronet only exposes API specific to mobile platforms (Java, Objective C). 

We are working on public C API that could be supported on desktop platforms, however our primary focus remains on mobile.

thanks,

-m

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[chan...@google.com]

On Tuesday, April 25, 2017 at 10:56:27 AM UTC-4, Misha Efimov wrote:
> Hi Marshall,
>
>
> Currently Cronet only exposes API specific to mobile platforms (Java, Objective C). 
> We are working on public C API that could be supported on desktop platforms, however our primary focus remains on mobile.
>
>
> thanks,
> -m
>
>
> On Mon, Apr 24, 2017 at 4:15 PM, Marshall Greenblatt <magree...@gmail.com> wrote:
>
> Hi All,
>
>
> Are there any plans currently to support Cronet [1] as a stand-alone library for desktop platforms (Linux, Windows, macOS) in addition to the already supported mobile platforms (Android, iOS)?
>
>
> Thanks,
> Marshall
>
>
> [1] https://chromium.googlesource.com/chromium/src/+/lkgr/components/cronet/
>
>
>
>
> --
>
> You received this message because you are subscribed to the Google Groups "net-dev" group.
>

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>
> To post to this group, send email to net...@chromium.org.
>
> To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/net-dev/CAFW9UJ-0t765%3DuOzfyC8pndYB37Z9KcHanJPbkP%3DfpjNYQwE4g%40mail.gmail.com.

I've been researching a way to use Cronet for plain Java desktop applications. Is a standalone Java library still not yet available?

I thought I could somehow build such a library from https://chromium.googlesource.com/chromium/src/+/HEAD/components/cronet/build_instructions.md, which has the section "Desktop builds (targets the current OS)". But all I get is some shared .so libraries, and I came to my own conclusion that there is no Java library I can build for desktop applications. Did I understand it right?

Is there any way I can easily use Cronet to do "new CronetEngine()" and just start using it?

[Caleb Raitto]

Correct, the Java API is only for Android -- it references android.* packages, which aren't in desktop Java. 

To target desktop, you'd have to use the Cronet native C API (you could call this from a Java desktop app via JNI -- it can also be used directly from C++). 

We don't provide official support for Cronet on desktop today, so you'd have to build the library from the Chromium repository, which it sounds like you've already done.

A sample for the native C API can be found in the Chromium repo: https://cs.chromium.org/chromium/src/components/cronet/native/sample/ -- you can build it (assuming you used out/Cronet as your output directory) with ninja -C out/Cronet cronet_sample -- the sample also has unit tests in its test/ subdirectory you can build with ninja -C out/Cronet cronet_sample_test (both of those targets are defined in components/cronet/BUILD.gn).

That should give you an environment to try out the API.

The API is intentionally similar to the Java / Android Cronet API, and is mostly defined in an IDL file (using Chromium's mojo IPC language -- however, note that Cronet native is in-process) that's transformed into C headers via a generator script. The main entry header, cronet_c.h, defines a few extra functions that aren't in the IDL. IDL interfaces with the [Abstract] keyword are implemented by the app.

For example, an IDL interface like UrlRequest makes methods like:

Cronet_UrlRequest_Create()

Cronet_UrlRequest_Destroy()

Cronet_UrlRequest_InitWithParams()

Cronet_UrlRequest_Read()

...

Similarly, structures generate methods like this (we don't share anything but void pointers across the library boundary -- the headers have function definitions only):

Cronet_UrlRequestParams_http_method_get()

Cronet_UrlRequestParams_http_method_set()

Cronet_UrlRequestParams_request_headers_add()

Cronet_UrlRequestParams_request_headers_size()

Cronet_UrlRequestParams_request_headers_at()

Cronet_UrlRequestParams_request_headers_clear()

 

-Caleb

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[王坤]

Maybe now it's time to try Cronet C API with Flutter Desktop or Compose for Desktop

Related: https://mail.google.com/mail/u/0/#inbox/FMfcgxwLswRTDvpVlhvnllPQkMVdTLCP

[闫辉]

same question ~