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Jonah Williams cdeb9a7a8c Revert "[vmservice] allow fallback on port bind failure" 
This reverts commit 6ff7e9ebad.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [vmservice] allow fallback on port bind failure
> 
> Work towards https://github.com/flutter/flutter/issues/46724
> 
> Background:
> 
> on the latest versions of iOS today, we have to use mdns to discover the observatory port and authentication code. For a variety of reasons this can fail, leaving us with no way to connect.
> 
> An alternative approach is to specify the observatory port and disable the authentication code. If binding to this port fails, however, we would still like to attempt connecting with mdns.
> 
> Overview:
> 
> This adds a new flag to the dart SDK, --enable-service-port-fallback. This amends the behavior of the vmservice with a specified port. After failing to bind once to a non-zero port, update the port selection to 0.
> 
> Results:
> 
> Tested locally two dart VMs with the same specified port:
> 
> ```
> jonahwilliams@jonahwilliams0:~/Documents/engine/src/out/host_debug_unopt$ ./dart --enable-service-port-fallback --observe=8080 example.dart
> Observatory server failed to start after 1 tries
> Falling back to automatic port selection
> vm-service: isolate(2785434094928835)  'main' has no debugger attached and is paused at exit.  Connect to Observatory to debug.
> Observatory listening on http://127.0.0.1:45663/62A5IHjmv9E=/
> ```
> 
> Change-Id: I371583edcb603325428f1cb760992e39b9f3b6dc
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130441
> Commit-Queue: Jonah Williams <jonahwilliams@google.com>
> Reviewed-by: Ben Konyi <bkonyi@google.com>

TBR=bkonyi@google.com,jonahwilliams@google.com

Change-Id: I337b2d549e33ef9c616c276a48ce894a14b1c317
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/133327
Reviewed-by: Jonah Williams <jonahwilliams@google.com>
Commit-Queue: Jonah Williams <jonahwilliams@google.com>
2020-01-24 21:47:34 +00:00
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pkg Issue 39917. Test that Never is resolved as Never* in legacy. 2020-01-24 21:33:34 +00:00
runtime Revert "[vmservice] allow fallback on port bind failure" 2020-01-24 21:47:34 +00:00
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sdk Revert "[vmservice] allow fallback on port bind failure" 2020-01-24 21:47:34 +00:00
sdk_nnbd Revert "[vmservice] allow fallback on port bind failure" 2020-01-24 21:47:34 +00:00
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README.md

Dart

A client-optimized language for fast apps on any platform

Dart is:

  • Optimized for UI: Develop with a programming language specialized around the needs of user interface creation

  • Productive: Make changes iteratively: use hot reload to see the result instantly in your running app

  • Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web

Dart has flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:

  • Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.

  • Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).

Dart platforms illustration

License & patents

Dart is free and open source.

See LICENSE and PATENT_GRANT.

Using Dart

Visit the dart.dev to learn more about the language, tools, getting started, and more.

Browse pub.dev for more packages and libraries contributed by the community and the Dart team.

Building Dart

If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.

There are more documents on our wiki.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.