Adding support for Init Functions

[madflojo]

Summary by CodeRabbit

• New Feature: Added "init functions" to Tarmac, allowing users to define initialization functions that execute when the service starts. This feature enhances the flexibility and control over service startup behavior.
• New Feature: Updated the Run method in Server struct to support initializing routes, executing init functions, and scheduling tasks. This change improves the server's functionality and versatility.
• Test: Introduced a new test case for handling failing init functions, improving the robustness of our testing suite.
• Chore: Added a new build target build-testdata to the Makefile, facilitating the building of additional test data.
• Documentation: Updated documentation to include details about the new "init functions" feature, providing users with necessary guidance on its usage.

[coderabbitai]

Walkthrough

This pull request introduces the concept of "init functions" to Tarmac, allowing for service initialization routines. It also includes a new build target for test data, and adds a test case for failing init functions. A Go example using Tarmac WASM functions is provided as well.

Changes

File(s)	Summary
Makefile	Adds a new build target for additional test data.
docs/wasm-functions/multi-function-services.md	Introduces "init functions" feature with examples.
pkg/app/app.go	Modifies the Run method to support init functions and task scheduling.
pkg/app/app_test.go	Adds a test case for a failing init function.
testdata/fail/...	Includes a Makefile for a Go example using Tarmac WASM functions and a Go program that initializes the Tarmac SDK.

🐇💻

Code changes here, code changes there,

Init functions everywhere!

With tests and docs, we take care,

To ensure our code is fair.

So celebrate this pull request's might,

For it brings Tarmac's features to light! 🎉

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[coderabbitai]

Review Status

Actionable comments generated: 1

Commits

Files that changed from the base of the PR and between fc714c7 and 2edd8f8.

Files ignored due to filter (5)

• testdata/fail/docker-compose.yml
• testdata/fail/go.mod
• testdata/fail/go.sum
• testdata/tarmac-fail.json
• testdata/tarmac.json

Files selected for processing (6)

• Makefile (1 hunks)
• docs/wasm-functions/multi-function-services.md (1 hunks)
• pkg/app/app.go (3 hunks)
• pkg/app/app_test.go (1 hunks)
• testdata/fail/Makefile (1 hunks)
• testdata/fail/main.go (1 hunks)

Files skipped from review due to trivial changes (5)

• Makefile
• docs/wasm-functions/multi-function-services.md
• pkg/app/app_test.go
• testdata/fail/Makefile
• testdata/fail/main.go

Additional comments (Suppressed): 1

pkg/app/app.go (1)

• 454-462: The new code introduces the concept of "init functions" which are executed when the service starts. Ensure that these init functions are designed to be idempotent and can handle being called multiple times without causing issues, as they might be called again if the service restarts.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (fc714c7) 82.40% compared to head (2edd8f8) 82.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   82.40%   82.57%   +0.17%     
==========================================
  Files          12       12              
  Lines        1125     1136      +11     
==========================================
+ Hits          927      938      +11     
  Misses        152      152              
  Partials       46       46              

Files	Coverage Δ
pkg/app/app.go	75.19% <100.00%> (+0.73%)	⬆️

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