Add the gRPC tutorial

[freevie]

The content is truly incomplete and will be updated through reviews & QnA.

Motivation:

Add a new tutorial set for gRPC

Modifications:

• Add tutorial draft

Result:

• WIP

[freevie]

I've labelled questions with "// TW question". Please have a look and let me know. Sorry, I wasn't able to compose the tutorial for the client. (Haven't checked if the code was prepared or not.) I'll get in touch with you this week.

[codecov[bot]]

Codecov Report

Merging #3987 (d255bb7) into master (7741676) will increase coverage by 0.26%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3987      +/-   ##
============================================
+ Coverage     73.53%   73.80%   +0.26%     
- Complexity    17644    17712      +68     
============================================
  Files          1500     1509       +9     
  Lines         65990    66198     +208     
  Branches       8325     8313      -12     
============================================
+ Hits          48528    48857     +329     
- Misses        13254    13341      +87     
+ Partials       4208     4000     -208     

Impacted Files	Coverage Δ
...ria/internal/common/grpc/GrpcExchangeTypeUtil.java	50.00% <0.00%> (-40.00%)	:arrow_down:
.../armeria/server/grpc/UnframedGrpcErrorHandler.java	66.66% <0.00%> (-23.17%)	:arrow_down:
...server/grpc/UnframedGrpcStatusMappingFunction.java	77.77% <0.00%> (-22.23%)	:arrow_down:
...com/linecorp/armeria/common/metric/MoreMeters.java	78.75% <0.00%> (-8.75%)	:arrow_down:
...rnal/common/GracefulConnectionShutdownHandler.java	68.08% <0.00%> (-6.39%)	:arrow_down:
...eria/internal/common/stream/StreamMessageUtil.java	61.11% <0.00%> (-5.56%)	:arrow_down:
...p/armeria/common/stream/AbstractStreamMessage.java	79.20% <0.00%> (-3.97%)	:arrow_down:
...necorp/armeria/common/util/CompositeException.java	40.00% <0.00%> (-3.81%)	:arrow_down:
...va/com/linecorp/armeria/server/docs/FieldInfo.java	60.52% <0.00%> (-3.37%)	:arrow_down:
...com/linecorp/armeria/client/DefaultRestClient.java	50.00% <0.00%> (-3.34%)	:arrow_down:
... and 262 more

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[freevie]

@ikhoon , As I shared earlier, I've modified the create and read pieces. Could you check if I am going on the right direction? With your confirmation, I'll proceed with the rest of the operations.

[freevie]

@ikhoon,

Please have a look and let me know if I got the direction and the content right.

P.S. You saved my life the other day. That local history feature is a charm! Thank you!

[CLAassistant]

All committers have signed the CLA.

[freevie]

@minwoox ,

Sorry, I didn't quite catch what you meant by this:

I guess we need this in Try writing blog service yourself.

The section titled "Try writing blog service yourself" contains a link to the "Defining a blog service and messages", so am a bit confused.

[minwoox]

Sorry, I didn't quite catch what you meant by https://github.com/line/armeria/pull/3987#discussion_r942033190: I guess we need this in Try writing blog service yourself. The section titled "Try writing blog service yourself" contains a link to the "Defining a blog service and messages", so am a bit confused.

Ah, I left my opinion on @jrhee17's comment about google/protobuf-gradle-plugin. 😄 https://github.com/line/armeria/pull/3987#discussion_r932028001

[minwoox]

LGTM once @jrhee17's comments are addressed. Thank you so much for writing this awesome tutorial. 🙇‍♂️ 🙇‍♂️ 🙇‍♂️

[freevie]

@minwoox , @ikhoon , @jrhee17 , I believe I've applied all the comments. Please kindly let me know if I've left any out.

[ikhoon]

@freevie Thanks so much for your hard work! ❤️🙇‍♂️