Harden Redis store semantics and align CI/tooling

.github/workflows/ci.yml

@@ -4,17 +4,13 @@ on:
   push:
     branches: [main]
   pull_request:
-    branches: "*"
 
 jobs:
   check_format:
-    strategy:
-      fail-fast: false
     runs-on: ubuntu-latest
-    continue-on-error: false
     steps:
       - name: Download source
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install Crystal
         uses: crystal-lang/install-crystal@v1
       - name: Install shards
@@ -23,17 +19,15 @@ jobs:
         run: crystal tool format --check
       - name: Lint
         run: ./bin/ameba
+      - name: Build shard entrypoint
+        run: crystal build src/lucky_cache_redis_store.cr
+
   specs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest]
-        crystal_version: [latest]
-        include:
-          - os: ubuntu-latest
-            crystal_version: 1.4.0
-    runs-on: ${{ matrix.os }}
-    continue-on-error: false
+        crystal_version: ["1.16.3", latest]
+    runs-on: ubuntu-latest
     services:
       redis:
         image: redis:7-alpine
@@ -45,11 +39,11 @@ jobs:
         ports:
           - 6379:6379
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: crystal-lang/install-crystal@v1
         with:
           crystal: ${{ matrix.crystal_version }}
       - name: Install dependencies
         run: shards install --skip-postinstall --skip-executables
       - name: Run tests
-        run: crystal spec
+        run: crystal spec

.github/workflows/docs.yml

@@ -7,8 +7,10 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false
       - uses: crystal-lang/install-crystal@v1
@@ -17,7 +19,7 @@ jobs:
       - name: "Generate docs"
         run: crystal docs
       - name: Deploy to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./docs
+          publish_dir: ./docs

README.md

@@ -8,8 +8,6 @@ A Redis storage backend for [LuckyCache](https://github.com/luckyframework/lucky
 
    ```yaml
    dependencies:
-     lucky_cache:
-       github: luckyframework/lucky_cache
      lucky_cache_redis_store:
        github: luckyframework/lucky_cache_redis_store
    ```
@@ -19,9 +17,7 @@ A Redis storage backend for [LuckyCache](https://github.com/luckyframework/lucky
 ## Usage
 
 ```crystal
-require "lucky_cache"
 require "lucky_cache_redis_store"
-require "redis"
 
 LuckyCache.configure do |settings|
   settings.storage = LuckyCache::RedisStore.new(
@@ -58,13 +54,26 @@ cache.delete("my_key")
 cache.flush
 ```
 
+## Expiration Semantics
+
+- `expires_in` is stored with millisecond precision.
+- TTL values must be at least `1.millisecond`.
+- `0.seconds`, negative durations, and positive durations below `1.millisecond` raise `ArgumentError`.
+- `read` restores cache items with their original TTL metadata and the correct absolute expiration time.
+
+## Prefix Operations
+
+- `flush` removes only keys that match the store's configured prefix.
+- `size` counts only keys that match the configured prefix.
+- Both operations iterate Redis with `SCAN`, not `KEYS`, so they remain safer on larger keyspaces.
+
 ### Supported Types
 
 The Redis store supports the following types:
 - Basic types: `String`, `Int32`, `Int64`, `Float64`, `Bool`, `Time`, `UUID`, `JSON::Any`
 - Arrays of basic types: `Array(String)`, `Array(Int32)`, `Array(Int64)`, `Array(Float64)`, `Array(Bool)`
 
-**Note:** Custom objects that include `LuckyCache::Cachable` are not supported by RedisStore due to serialization limitations. Use MemoryStore for caching custom objects.
+**Note:** Custom objects that include `LuckyCache::Cacheable` are not supported by RedisStore due to serialization limitations. Use MemoryStore for caching custom objects.
 
 ### Workaround for Custom Objects
 
@@ -75,7 +84,10 @@ You can cache JSON representations of your objects:
 # cache.write("user:123") { User.new("test@example.com") } # This will raise an error
 
 # Cache a JSON representation
-user_data = {"id" => 123, "email" => "test@example.com"}
+user_data = {
+  "id" => JSON::Any.new(123_i64),
+  "email" => JSON::Any.new("test@example.com"),
+}
 cache.write("user:123") { JSON::Any.new(user_data) }
 
 # Retrieve and reconstruct
@@ -87,14 +99,16 @@ user = User.new(cached_data["email"].as_s)
 
 To run the tests:
 
-1. Make sure Redis is running locally on the default port (6379)
+1. Make sure Redis is running locally on the default port (`6379`)
 2. Run `crystal spec`
 
 The test suite includes tests for:
 - Basic type caching
 - Array type caching
-- Expiration functionality
-- Key deletion and cache flushing
+- Millisecond TTL handling and TTL validation
+- Expiration correctness after Redis deserialization
+- Key deletion, prefix-scoped flushing, and prefix-scoped sizing
+- Standalone shard loading
 - Custom prefix support
 - Error handling for non-serializable types
 

shard.yml

@@ -1,10 +1,10 @@
 name: lucky_cache_redis_store
-version: 0.1.0
+version: 0.2.0
 
 authors:
   - Jeremy Woertink <jeremywoertink@gmail.com>
 
-crystal: '>= 1.14.1'
+crystal: ">= 1.16.3"
 
 license: MIT
 
@@ -17,6 +17,7 @@ dependencies:
 development_dependencies:
   ameba:
     github: crystal-ameba/ameba
-    version: ~> 1.5.0
+    version: ~> 1.6.4
   timecop:
     github: crystal-community/timecop.cr
+    version: ~> 0.5.0