[meta] Support WebDriver BiDi in Cypress
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(Reporter: ato, Unassigned, NeedInfo)
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Tracking bug for Cypress related issues with Firefox.
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Reporter | |
Updated•5 years ago
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Does Cypress really depend on Puppeteer or does it make direct use of the Chrome dev-tools protocol? I only see references to CDP when checking the repository, but nothing about Puppeteer.
As James seconded on IRC it is using CDP directly.
Current commands in use seem to be:
Methods:
- Browser.getVersion (supported)
- Page.bringToFront (supported)
- Page.captureScreenshot (supported - clip option soon via bug 1587845)
- Page.navigate (supported but there are issues with early returning - see bug 1603776)
- Page.startScreencast (not supported)
Events:
- Page.screencastFrame (not supported)
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Comment 4•5 years ago
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(In reply to Henrik Skupin (:whimboo) [⌚️UTC+1] from comment #2)
As James seconded on IRC it is using CDP directly.
Not only that, Cypress uses CDP through chrome-remote-interface, which we are fortunate enough to use for our browser-chrome testing! 👏🏻
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Comment 5•5 years ago
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Cypress also uses some Network.* commands to manage cookies: https://github.com/cypress-io/cypress/blob/develop/packages/server/lib/browsers/cdp_automation.ts
- Network.setCookie bug 1588114
- Network.deleteCookies bug 1549453
- Network.getAllCookies - there does not seem to be an open bug for this
- Network.getCookies bug 1549458
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Comment 6•5 years ago
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It also uses Emulation.setDeviceMetricsOverride to provide a consistent viewport size in some of the tests:
(In reply to Zach Bloomquist from comment #5)
- Network.getAllCookies - there does not seem to be an open bug for this
Is that a new feature? I wonder why it isn't listed under https://chromedevtools.github.io/devtools-protocol/tot/Network. Maybe they missed to add it?
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Comment 8•5 years ago
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(In reply to Henrik Skupin (:whimboo) [⌚️UTC+1] from comment #7)
(In reply to Zach Bloomquist from comment #5)
- Network.getAllCookies - there does not seem to be an open bug for this
Is that a new feature? I wonder why it isn't listed under https://chromedevtools.github.io/devtools-protocol/tot/Network. Maybe they missed to add it?
What version of the API are you looking at? I see it in the docs for 1.3 and latest: https://chromedevtools.github.io/devtools-protocol/tot/Network/#method-getAllCookies
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Comment 9•5 years ago
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Network.getAllCookies is a new feature as of 13th December of this year, introduced by 9349e8fc.
I made a similar comments with some more details on the review for bug 1590098 implementing Network.getCookies yesterday.
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Comment 10•5 years ago
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(In reply to Andreas Tolfsen 「:ato」 from comment #9)
Network.getAllCookiesis a new feature as of 13th December of this year, introduced by9349e8fc.
Hmm, that commit seems to say Tue Dec 13 17:12:37 2016, not Tue Dec 13 17:12:37 2019. I am not sure what exact release it was introduced in Chrome, but we've been using it in Cypress for at least a few months with no complaints from users (users use their Chrome version of choice)
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Reporter | |
Comment 11•5 years ago
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Oops, years are apparently easy to misread (-:
Zach, which specific features of Emulation.setDeviceMetricsOverride is in use by Cypress? Could you check if the current Firefox Nightly build contains everything with bug 1544417 fixed? Thanks
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Comment 13•5 years ago
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(In reply to Henrik Skupin (:whimboo) [⌚️UTC+1] from comment #12)
Zach, which specific features of
Emulation.setDeviceMetricsOverrideis in use by Cypress? Could you check if the current Firefox Nightly build contains everything with bug 1544417 fixed? Thanks
It's used in 1 place, in Cypress's tests, here is how it's invoked:
Cypress uses width, height, deviceScaleFactor, mobile, screenWidth, and screenHeight. It looks like the first three of those are implemented, and the last two (screenHeight and screenWidth) actually seem to be redundant, so we don't need those for now.
mobile isn't implemented in FF yet, but we set it to false anyways, so that's fine too. Interestingly though, if I omit mobile from the arguments, Chrome responds with an error:
received CDP message { error: { code: -32602, message: 'Invalid parameters', data: 'mobile: boolean value expected' }, id: 6 } +12ms
Yes, it's not raising an error because we don't have the mobile support yet. It will be added with bug 1608468.
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Updated•2 years ago
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Comment 15•26 days ago
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Cypress is starting work to migrate Cypress' use of Firefox from CDP, marionette, and foxdriver over to Webdriver BiDi and geckodriver.
Today, Cypress uses an old fork of the marionette client that is responsible for a few WebDriver Classic methods and to install Cypress' web extension.
Right now Cypress' web extension in Firefox is responsible for a few things, such as:
- listening for download events
- attaching Cypress specific automation headers to the support the
cy.origin()command - Automating cookie operations (normally handled by CDP in chromium based browsers)
- Clearing browser state between tests
- Taking screenshots for failures or for
cy.screenshot()
Currently, this is a temporary unsigned extension, which makes sense for us as we are automating the browser and it makes the extension easier to develop without signing it for open source users, as they would need the signing keys. It currently isn't possible to register an unsigned extension through the -install-global-extension argument.
Talking with Henrik, it looks like the Marionette JavaScript client is not supported, but geckodriver has commands that we can leverage to install a temporary web extension. I believe this uses the marionette protocol under the hood, which should work for now as the extensions responsibilities will be significantly less as we migrate more code over to BiDi, so this works as a good interim band-aid.
I have a small POC commit that uses wdio's wrapper around geckodriver to start up geckodriver and initialize a WebDriver session. From this, we can install our web extension and connect to the Webdriver BiDi socket and stream subscribed BiDi events in.
I have created a mapping spreadsheet of the CDP, web APIs, and replacement BiDi methods that Cypress will likely be migrating to. Everyone should be able to view this but if anyone needs comment/edit access let me know!
Im currently using these for documentation:
Are there other resources I should be leveraging? I am also curious if it is possible to clone the geckodriver code as I haven't used mozilla-central before.
The big proving replacement work is in the POC commit . I will start the cutover process and will comment and findings or issues I run into as I am quite early on in my migration journey.
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Comment 16•23 days ago
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Do we know what parts of the BiDi specification landed in which Firefox versions? The main reason I ask is Cypress currently supports back to Firefox 86. I'm assuming the spec was introduced over time between then and the current 130 version. We can increase the version of our minimum support but it does promote a breaking change.
With that in mind, I believe the current plan is to completely remove CDP from firefox by the end of 2024. Is this still correct? Is there an approximate date for removal?
Hi William,
First thank you for moving our conversation to Bugzilla which will help us to better track the required work on our side to support Cypress in moving away from CDP by using WebDriver BiDi in the future. It's great to see your interest!
(In reply to William Glesias from comment #15)
Right now Cypress' web extension in Firefox is responsible for a few things, such as:
- listening for download events
- attaching Cypress specific automation headers to the support the
cy.origin()command- Automating cookie operations (normally handled by CDP in chromium based browsers)
- Clearing browser state between tests
- Taking screenshots for failures or for
cy.screenshot()
Except for download events and and fully clearing the browser state (without a profile reset I assume) all the other features should be fully available in our WebDriver BiDi implementation. That means that those might be a good start. If one of these features doesn't work as expected please let us know and we will fix or have to extend the WebDriver BiDi specification.
Talking with Henrik, it looks like the Marionette JavaScript client is not supported, but geckodriver has commands that we can leverage to install a temporary web extension. I believe this uses the marionette protocol under the hood, which should work for now as the extensions responsibilities will be significantly less as we migrate more code over to BiDi, so this works as a good interim band-aid.
It’s interesting to see that the JS client from the old B2G project is still in use for Marionette. I just wanted to mention that since then, a lot has changed in Marionette’s server implementation, so certain features might not be available in your client version, depending on when the fork happened. But all that could be irrelevant if the features you need are supported.
I have a small POC commit that uses wdio's wrapper around geckodriver to start up geckodriver and initialize a WebDriver session. From this, we can install our web extension and connect to the Webdriver BiDi socket and stream subscribed BiDi events in.
That sounds actually great and it looks like you can at least easily switch over to geckodriver. When you are mentioning WebDriver IO you most likely also noticed that it has support for WebDriver BiDi included and gets regularly updated for the recent changes in the specification.
I have created a mapping spreadsheet of the CDP, web APIs, and replacement BiDi methods that Cypress will likely be migrating to. Everyone should be able to view this but if anyone needs comment/edit access let me know!
Thanks a lot! This is a great starting point. I’ll go through each of these items and let you know if anything is unclear or missing. Once we have a clear understanding of what still needs to be added to the specification and implemented in Firefox, we can update the bug with a checklist of features.
Im currently using these for documentation:
Are there other resources I should be leveraging?
More documentation can be found at these locations:
- https://firefox-source-docs.mozilla.org/testing/geckodriver/index.html
- https://firefox-source-docs.mozilla.org/remote/index.html
- https://webdriver.io/de/blog/2023/06/08/bidi-typescript-support/
There are others as well and we can share once certain help is needed.
I am also curious if it is possible to clone the geckodriver code as I haven't used mozilla-central before.
We have a github fork of geckodriver at https://github.com/mozilla/geckodriver/ but it's only used for publishing releases. If you want to stay on the latest changes or once in a while contribute a patch you would have to clone the central or unified repository. You can use git as well by utilizing git-cinnabar for the moment.
The big proving replacement work is in the POC commit . I will start the cutover process and will comment and findings or issues I run into as I am quite early on in my migration journey.
Thank you! And whenever there are issues please reach out to us so that we can early find solutions and work on enhancements. Best here would be to join our Matrix channel at https://chat.mozilla.org/#/room/#webdriver:mozilla.org.
(In reply to William Glesias from comment #16)
Do we know what parts of the BiDi specification landed in which Firefox versions? The main reason I ask is Cypress currently supports back to Firefox 86. I'm assuming the spec was introduced over time between then and the current 130 version. We can increase the version of our minimum support but it does promote a breaking change.
Yes that's what we track in this Google spreadsheet at the moment. Our plan is to bring this information to MDN as well so that for certain APIs and arguments you will have clear version numbers but this work hasn't started yet.
Also I want to note that Firefox 86 is not supported for a very long time, and it would be good to know why your compatibility matrix goes back that long. Those versions are vulnerable to certain security issues and should basically no longer be used. The oldest officially supported Firefox release is 115 ESR (extended release) and soon 128 ESR.
With that in mind, I believe the current plan is to completely remove CDP from firefox by the end of 2024. Is this still correct? Is there an approximate date for removal?
Yes, that's still correct. At this point, we don't have a concrete timeline, as it will also depend on the migration progress for consumers like yourself. If we encounter any issues with completion and need to extend support for a few weeks, that won't be a problem.
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Comment 18•11 days ago
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Comment 19•11 days ago
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( looks like my log upload posted my comment in draft. sorry about that! Doesn't look like I can edit it. Would you mind deleting the contents? Here is the complete comment)
Hi Henrik,
Sorry for the delay on an update here. I've been pretty busy heads down trying to cut over the older b2g marionette client over to geckodriver.
The good news is it has mostly been successful! I have a draft pull request open that mostly works, using the geckodriver package that wdio has to spin up the geckodriver process and then send our capabilities to start firefox.
That sounds actually great and it looks like you can at least easily switch over to geckodriver. When you are mentioning WebDriver IO you most likely also noticed that it has support for WebDriver BiDi included and gets regularly updated for the recent changes in the specification.
I do want to clarify that we are just using the geckodriver package from wdio. I see that they have WebDriver BiDi support but we need to hook into the protocol ourselves to help automate the browser, which should not be too difficult at least from my experience so far, which is good!
Most things seem to work correctly, like arguments, and preferences, but I cannot seem to get environment variables to actually work. We are sending the env capabilities, which looks correct looking at the documentation and source code.
What am I missing here? based on the geckodriver debug logs everything looks to be forwarded as expected
geckodriver starts
Starting Geckodriver at /tmp/geckodriver with params: --host=127.0.0.1 --port=43323 --marionette-host=127.0.0.1 --marionette-port=42595 --websocket-port=33209 --profile-root=/home/atofstryker/snap/firefox/current/Cypress/firefox-stable/run-47207 --binary=firefox --jsdebugger --log=debug --log-no-truncate +0ms
We send our capabilities to geckodriver via the webdriver new session command. We can see the MOZ_REMOTE_SETTINGS_DEVTOOLS, MOZ_HEADLESS_WIDTH, and MOZ_HEADLESS_HEIGHT env variables populated in the capabilities object (sorry for the large preferences object)
webdriver::server DEBUG -> POST /session 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+1ms
geckodriver starts the firefox process, with some environment variables but not the ones I sent. Any idea why this is happening?
mozrunner::runner INFO Running command: MOZ_CRASHREPORTER="1" MOZ_CRASHREPORTER_NO_REPORT="1" MOZ_CRASHREPORTER_SHUTDOWN="1" MOZ_NO_REMOTE="1" "firefox" "--marionette" "--jsdebugger" "-new-instance" "-start-debugger-server" "-no-remote" "-headless" "-width" "1280" "-height" "806" "--remote-debugging-port" "33209" "--remote-allow-hosts" "localhost" "-profile" "/home/atofstryker/snap/firefox/current/Cypress/firefox-stable/run-47207/rust_mozprofilepZiPnI" +2ms
This looks to be the only hurdle we need to overcome. Everything else has worked out great. full log is attached above. Once we figure this out we should be able to finish the cut over and then build BiDi support on top of it.
Also I want to note that Firefox 86 is not supported for a very long time, and it would be good to know why your compatibility matrix goes back that long. Those versions are vulnerable to certain security issues and should basically no longer be used. The oldest officially supported Firefox release is 115 ESR (extended release) and soon 128 ESR.
I think this has to do with oversight on our end. We can also move the supported version of firefox up in the near future, and likely want to have some type of rolling support like "past 10 versions"
(In reply to William Glesias from comment #18)
Sorry for the delay on an update here. I've been pretty busy heads down
trying to cut over the olderb2g marionette clientover togeckodriver.
No worries at all William. I already thought so and wanted to wait a bit until reaching out to you again.
The good news is it has mostly been successful! I have a draft pull
request open that mostly
works, using thegeckodriverpackage that wdio has to spin up the
geckodriver process and then send our
[capabilities](https://github.com/cypress-io/cypress/pull/30250/files#diff-
6ec303ebac972615597a2bbcc7cd2986c44cea3ff5b0eccb0b8724a8527d1972R562) to
start firefox.
This is great to hear! So lets see that we can get the remaining issues resolved soon as well! Let me check your questions...
I do want to clarify that we are just using the
geckodriverpackage from
wdio. I see that they have WebDriver BiDi support but we need to hook into
the protocol ourselves to help automate the browser, which should not be too
difficult at least from my experience so far, which is good!
So does it mean you need to fully rewrite the client yourself and you cannot rely on the BiDi code that is already present in https://www.npmjs.com/package/webdriver? I'm asking because that code is auto-generated from the actual WebDriver BiDi specification.
Most things seem to work correctly, like arguments, and preferences, but I
cannot seem to get environment variables to actually work. We are sending
theenvcapabilities, which looks correct looking at the
[documentation](https://developer.mozilla.org/en-US/docs/Web/WebDriver/
Capabilities/firefoxOptions#example) and [source
code](https://searchfox.org/mozilla-central/source/testing/geckodriver/src/
capabilities.rs#595).What am I missing here? based on the
geckodriverdebug logs everything
looks to be forwarded as expected
Yes, that is expected. Environment variables aren't supported that way. This capability is only used for Android when we have to forward the variables to the actual process on the device. It might not be that clear when reading through https://developer.mozilla.org/en-US/docs/Web/WebDriver/Capabilities/firefoxOptions.
To get it working on desktop you should be able to pass all the environment variables to the geckodriver process which itself will forward these automatically to the Firefox process.
Also I want to note that Firefox 86 is not supported for a very long time, and it would be good to know why your compatibility matrix goes back that long. Those versions are vulnerable to certain security issues and should basically no longer be used. The oldest officially supported Firefox release is 115 ESR (extended release) and soon 128 ESR.
I think this has to do with oversight on our end. We can also move the supported version of firefox up in the near future, and likely want to have some type of rolling support like "past 10 versions"
Sounds good. Note that you can find our support Matrix at:
https://firefox-source-docs.mozilla.org/testing/geckodriver/Support.html
Let me know if there are other issues you are blocked on here via Bugzilla or as mentioned on our Matrix channel. Thanks!
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Comment 21•2 days ago
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Looks like we have geckodriver fully working in https://github.com/cypress-io/cypress/pull/30250 which is a great sign. Passing the environment variables to geckodriver that we need in the firefox process worked just like you recommended.
So does it mean you need to fully rewrite the client yourself and you cannot rely on the BiDi code that is already present in https://www.npmjs.com/package/webdriver? I'm asking because that code is auto-generated from the actual WebDriver BiDi specification.
I think at the time of writing this comment I wasn't too sure on the direction we would go. It looks like the webdriver package is minimal enough that it would do exactly what a websocket client would handle anyway. Now that geckodriver works, I was able to prove out using the webdriver package via being our default client. There should be a PR for that in the near future. In other words, we should be able to use the package and not need to fully rewrite a client (which sounds like a maintenance nightmare).
We are still making good progress. I will post updates on here in the near future!
(In reply to William Glesias from comment #21)
Looks like we have geckodriver fully working in https://github.com/cypress-io/cypress/pull/30250 which is a great sign. Passing the environment variables to geckodriver that we need in the firefox process worked just like you recommended.
Amazing! It's great to see and should make the rest easier to get implemented.
I think at the time of writing this comment I wasn't too sure on the direction we would go. It looks like the
webdriverpackage is minimal enough that it would do exactly what a websocket client would handle anyway. Now that geckodriver works, I was able to prove out using the webdriver package via being our default client. There should be a PR for that in the near future. In other words, we should be able to use the package and not need to fully rewrite a client (which sounds like a maintenance nightmare).
Perfect. Please let me know why you have that PR open, or add it yourself to the See Also section of this bug.
As well it would be good to get started to discuss the remaining features - especially those were no workaround is available. If you could come up with this list I would appreciate. Happy to also chat on Matrix or via a Zoom call. Maybe you can take a look at the BiDi roadmap spreadsheet and add priorities for the still missing features in column H? Thanks!
Description
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