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gRPC Client Implementation#8423

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spericas merged 38 commits intohelidon-io:mainhelidon-io/helidon:mainfrom spericas:grpc-updatespericas/helidon:grpc-updateCopy head branch name to clipboardMay 30, 2024

+4,674-44

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Commits on May 29, 2024

• Initial commit based on in-progress work from Tomas.

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• Additional work arounds tests and descriptors.

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• Simple unary method call without using stubs.

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• Basic support for unary, serverStream, streamClient and bidi invocations.

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• Support for sync and async gRPC calls.

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• Fixed problem with EOS and improved logging. All basic tests are passing.

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• Initial support for gRPC stubs, async only for now.

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• New test for gRPC that uses stubs. Fixes a number of checkstyle and copyright issues.

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• Use WebClient to create GrpcClient(s).

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• Fixed unary blocking test.

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• Support for TLS. Switched tests to use TLS.

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• Simplified and optimized implementation of gRPC unary calls.

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• Moved test to webclient module.

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• Removed currently unused types from grpc core module.

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• Cleanup of webserver gRPC module.

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• Test cleanup and copyright errors.

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• Adds support for setting up gRPC routes in tests. Updates gRPC tests to implement @SetupRoute methods.

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• Removes currently unused types.

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• - Simplifies the grpc.core module to the bare minimum that is needed now

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• Switches to socket context logging. Throws more detailed exception if baseUri is not present.

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• Converts PriorityBag to WeightedBag.

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• Introduces support for client interceptors in low-level, stub-free API.

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• Basic support for client interceptors with service stubs

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• Improves support for empty server streams. Includes fix in Http2ClientStream to allow transitions from HEADERS to END. New tests.

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• Adds more tests for client and server empty streams.

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• Handles server EOS in HEADERS frame on the client side. Increased read timeout on client.

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• Some new tests from JK and fixes to gRPC client code to handle: (1) exceptions thrown in gRPC methods and (2) larger payloads.

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• Fixes problems in unary calls with large payloads.

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• Use protobuf version for protoc.

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• Basic support for gRPC protocol config settings

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• Javadoc updates.

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• Improves handling for server connection drops. On a read timeout, if the abort flag is not set, attempts to send a PING frame to verify the connection's health.

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• Uses a separate virtual thread to check if the connection to the server has died. The period to check for that is configurable and set to 5 seconds by default.

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• Sets heartbeat period to 0, thus disabling the feature by default.

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• Fixes logging message and test.

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• Refactors a few classes in grpc/core. Addresses other comments in PR review.

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• Reduces the number of logging statements in favor of using low-level HTTP/2 logging instead.

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Commits on May 30, 2024

• Some code reformatting using the Helidon scheme.

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