Added service invocation examples

[amulyavarote]

Signed-off-by: Amulya Varote amulyavarote@microsoft.com

Description

Added service invocation examples for dotnet, go, javascript and python

Issue reference

We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #557

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[pravinpushkar]

I think README.md files need to be adjusted according to suggestion given by @paulyuk

[paulyuk]

Just a few things.

Also in the /go/* folders there are two binary files called app. Should we gitignore these?

[paulyuk]

Just a few minor items left

[paulyuk]

Amazing feature add, thank you.

LGTM

[msfussell]

@amulyavarote - Do you want to take a look at the failure above?

[amulyavarote]

@amulyavarote - Do you want to take a look at the failure above?

yes. The PR builds are failing. We are looking into it

[tanvigour]

#557

[paulyuk]

Thank you @amulyavarote ! LGTM

[paulyuk]

The tests failures are flakiness on mac caused by some latencies and the same docker rate limiting we know about (fix in hand)

[joebowbeer]

One timing problem that occurred when I ran the javascript/http example in the devcontainer:

The order-processor may not be ready to receive the first order from the checkout service, in which case the first post returns a 500 and exits the checkout loop.

Moving the sleep to the top of the loop helps.

I think this problem and potential improvement applies to all of these service_invocation implementations.

Is there a better way for checkout to wait until the order-processor is running?