feat: Add ReadFrom parsing support to ConfigurationOptions for AZ Affinity #28

jbrinkman · 2025-08-13T14:51:48Z

Summary

This PR implements comprehensive ReadFrom parsing support in ConfigurationOptions to enable AZ (Availability Zone) affinity configuration through connection strings and programmatic configuration. This addresses issue #26 by providing a complete implementation of ReadFrom strategy parsing, validation, and serialization.

Changes Made

Core Implementation

ReadFrom Parsing: Added support for parsing readFrom and az parameters from connection strings
Strategy Validation: Implemented comprehensive validation for ReadFromStrategy and AZ parameter combinations
Serialization Support: Added ToString formatting for ReadFrom configurations with round-trip integrity
Property Validation: Enhanced ReadFrom property setter with cross-validation logic
Error Handling: Comprehensive error messages and validation throughout the pipeline

Supported ReadFrom Strategies

Primary - Always read from primary nodes
PreferReplica - Prefer replica nodes, fallback to primary
AzAffinity - Prefer replicas in the same AZ, with fallback
AzAffinityReplicasAndPrimary - Prefer nodes in the same AZ (replicas first, then primary), with fallback

Connection String Examples

localhost:6379,readFrom=Primary
localhost:6379,readFrom=PreferReplica  
localhost:6379,readFrom=AzAffinity,az=us-east-1a
localhost:6379,readFrom=AzAffinityReplicasAndPrimary,az=eu-west-1b

Test Coverage

992 lines of comprehensive end-to-end integration tests
48 test cases covering complete configuration pipeline
Connection string parsing to FFI layer verification
Error handling and validation scenarios
Round-trip serialization integrity
Backward compatibility with legacy configurations
Performance testing with concurrent connections
Both standalone and cluster client scenarios

Technical Details

Implementation Approach

Connection String Parsing: Extended DoParse method to handle readFrom and az parameters
Validation Logic: Implemented ValidateAndSetReadFrom with comprehensive strategy/AZ validation
Serialization: Added FormatReadFrom method for ToString output with proper formatting
Property Validation: Enhanced ReadFrom property setter with immediate validation
Error Propagation: Ensured validation errors propagate correctly through the entire pipeline

Validation Rules

Primary and PreferReplica strategies cannot have AZ parameters
AzAffinity and AzAffinityReplicasAndPrimary strategies require non-empty AZ parameters
Case-insensitive parsing for ReadFrom strategy values
Comprehensive error messages for all validation scenarios

Backward Compatibility

Existing configurations without ReadFrom continue to work unchanged
Default behavior preserved when no ReadFrom is specified
Legacy connection strings remain fully functional

Testing

All tests pass including:

✅ 48 new end-to-end integration tests
✅ Existing unit tests for ConfigurationOptions parsing
✅ Existing unit tests for ReadFrom property validation
✅ Integration tests for ConnectionMultiplexer ReadFrom mapping

Closes

Closes #26

Checklist

Implementation follows existing code patterns and conventions
Comprehensive test coverage with end-to-end integration tests
Backward compatibility maintained
Error handling and validation implemented
Documentation through comprehensive test examples
All existing tests continue to pass
DCO signoff included in all commits

Yury-Fridlyand · 2025-08-13T16:02:30Z

sources/Valkey.Glide/Abstract/ConfigurationOptions.cs

+        };
+
+        // Use property setter to ensure validation
+        cloned.ReadFrom = readFrom;


Why not to set as other fields set?

Yury-Fridlyand · 2025-08-13T16:03:30Z

sources/Valkey.Glide/Abstract/ConfigurationOptions.cs

+    private string? tempAz; // Temporary storage for AZ during parsing
+    private ReadFromStrategy? tempReadFromStrategy; // Temporary storage for ReadFrom strategy during parsing


If those need for parsing only - create them in the parsing method.

Yury-Fridlyand · 2025-08-13T16:04:46Z

sources/Valkey.Glide/Abstract/ConfigurationOptions.cs

+        };
+    }
+
+    private static void ValidateReadFromConfiguration(ReadFrom readFromConfig)


This method repeats ValidateAndSetReadFrom. Can you remove duplicates or re-use the code?

sources/Valkey.Glide/Abstract/ConfigurationOptions.cs

tests/Valkey.Glide.IntegrationTests/ConnectionMultiplexerReadFromMappingTests.cs

Yury-Fridlyand · 2025-08-13T16:20:47Z

tests/Valkey.Glide.IntegrationTests/ReadFromEndToEndIntegrationTests.cs

+        // Test that AZ affinity settings are properly passed to the Rust core
+        // by creating connections with different AZ values and verifying they work
+
+        var azValues = new[] { "us-east-1a", "us-west-2b", "eu-central-1c", "ap-south-1d" };


You are testing different names of az. It is an overkill. If client works with a random AZ name - it works.
If you still want to keep this test - parametrize it.

Yury-Fridlyand · 2025-08-13T16:21:27Z

tests/Valkey.Glide.IntegrationTests/ReadFromEndToEndIntegrationTests.cs

+
+        var connectionTasks = new List<Task<(ConnectionMultiplexer Connection, ReadFromStrategy Strategy, string? Az)>>();
+
+        var configurations = new[]


a. parametrize
b. I already seen this test above

Yury-Fridlyand · 2025-08-13T16:24:09Z

tests/Valkey.Glide.IntegrationTests/ReadFromEndToEndIntegrationTests.cs

There are a lot of repeating tests which do nothing.
There is no test which validates that client reaches server nodes in the configured AZ and doesn't reach in others.

Probably, create this test and delete all others - you'll save time on refactoring.

Yury-Fridlyand · 2025-08-13T16:25:17Z

tests/Valkey.Glide.UnitTests/ConfigurationOptionsReadFromTests.cs

+    [Theory]
+    [InlineData("us-east-1a")]
+    [InlineData("eu-west-1b")]
+    [InlineData("ap-south-1c")]
+    [InlineData("ca-central-1")]
+    public void ToString_WithAzAffinityStrategy_IncludesCorrectAzFormat(string azValue)
+    {
+        // Arrange
+        var options = new ConfigurationOptions();
+        options.ReadFrom = new ReadFrom(ReadFromStrategy.AzAffinity, azValue);
+
+        // Act
+        var result = options.ToString();
+
+        // Assert
+        Assert.Contains("readFrom=AzAffinity", result);
+        Assert.Contains($"az={azValue}", result);
+    }
+
+    [Theory]
+    [InlineData("us-west-2a")]
+    [InlineData("eu-central-1b")]
+    [InlineData("ap-northeast-1c")]
+    public void ToString_WithAzAffinityReplicasAndPrimaryStrategy_IncludesCorrectAzFormat(string azValue)
+    {


It is enough to test with 1 random string.

Yury-Fridlyand · 2025-08-13T16:26:07Z

tests/Valkey.Glide.UnitTests/ConfigurationOptionsReadFromTests.cs

A lot of repeating tests...

- Implement ParseReadFromStrategy method to convert string values to ReadFromStrategy enum - Add validation for ReadFrom strategy and AZ parameter combinations - Extend DoParse method to handle readFrom and az parameters from connection strings - Add comprehensive error handling with descriptive messages - Support case-insensitive parsing for all ReadFrom strategies - Extend ToString method to include ReadFrom and AZ in connection strings - Add comprehensive unit tests covering all parsing scenarios - Reorganize private fields to follow C# analyzer rules Addresses task 1 of GitHub issue #26 Satisfies requirements: 1.1, 1.2, 1.5, 1.6, 4.1, 4.2, 4.3, 4.4, 4.5 Signed-off-by: jbrinkman <[email protected]>

- Add FormatReadFrom method to convert ReadFrom struct to string representation - Extract FormatReadFromStrategy method as proper private method - Refactor ToString method to use new FormatReadFrom method - Ensure proper formatting for all ReadFromStrategy values - Maintain backward compatibility with existing ToString format Addresses task 2 of AZ affinity support implementation Signed-off-by: jbrinkman <[email protected]>

…parameters - Add readFrom case to the switch statement in DoParse method - Add az case to the switch statement in DoParse method - Implement proper parsing logic that creates ReadFrom struct from parsed values - Add validation during parsing to catch invalid combinations early - Support case-insensitive parsing of ReadFrom strategy values - Validate AZ parameter combinations with ReadFrom strategies Addresses task 4 from AZ affinity support specification Signed-off-by: jbrinkman <[email protected]>

- Add ConnectionMultiplexerReadFromMappingTests.cs with 12 test cases - Verify ReadFrom configuration mapping from ConfigurationOptions to ClientConfigurationBuilder - Test all ReadFromStrategy values (Primary, PreferReplica, AzAffinity, AzAffinityReplicasAndPrimary) - Verify null ReadFrom handling for backward compatibility - Test both standalone and cluster client configurations - Confirm end-to-end flow from ConfigurationOptions to ConnectionConfig Addresses task 5: Verify ConnectionMultiplexer ReadFrom mapping Requirements: 3.1, 3.2, 3.4, 6.1 Signed-off-by: jbrinkman <[email protected]>

…serialization - Add ToString output tests for each ReadFromStrategy value - Add round-trip parsing tests (Parse → ToString → Parse) - Add backward compatibility tests with existing configuration strings - Add proper AZ formatting tests in ToString output - Covers requirements 5.1-5.5 and 6.2-6.3 from AZ affinity support spec All 57 tests pass, ensuring proper serialization and deserialization of ReadFrom configurations while maintaining backward compatibility. Signed-off-by: jbrinkman <[email protected]>

…property validation - Add ReadFrom property setter validation tests for all strategies - Add Clone method ReadFrom preservation tests with comprehensive scenarios - Add null ReadFrom handling and default behavior tests - Add cross-validation tests between ReadFromStrategy and AZ parameters - Ensure proper error handling for invalid configurations - Verify independence of cloned instances - Test complex configuration scenarios with ReadFrom Addresses requirements 2.1, 2.2, 2.3, 2.4, 2.5, and 6.4 from AZ affinity support spec Signed-off-by: jbrinkman <[email protected]>

…g functionality Signed-off-by: jbrinkman <[email protected]>

…rom configuration - Add ReadFromEndToEndIntegrationTests with 48 test cases covering complete pipeline - Test connection string to FFI layer flow for all ReadFromStrategy values - Test ConfigurationOptions programmatic configuration flow - Test error handling throughout the complete configuration pipeline - Test round-trip serialization (Parse → ToString → Parse) integrity - Test backward compatibility with legacy configurations - Test performance scenarios with concurrent connections - Test FFI layer integration to verify configuration reaches Rust core - Verify AZ affinity settings are properly passed to the Rust core - Cover both standalone and cluster client scenarios - Fix test case for invalid ReadFrom strategy to avoid parsing ambiguity Implements task 12 from AZ Affinity support implementation plan. Requirements covered: 3.1, 3.2, 3.3, 3.4, 3.5 Signed-off-by: jbrinkman <[email protected]>

…iplexer - Updated exception message assertion in ConfigurationOptionsReadFromTests to be case insensitive. - Replaced reflection-based method invocation with direct calls to CreateClientConfigBuilder in ConnectionMultiplexerReadFromMappingTests for better readability and performance. - Added new tests to verify ReadFrom configuration flows correctly to ConnectionConfig for both standalone and cluster configurations. - Removed unnecessary reflection helper method to streamline the test code.

jbrinkman requested a review from a team as a code owner August 13, 2025 14:51

jbrinkman force-pushed the jbrinkman/az-affinity-configurationoptions-support branch from e0d1212 to ae81ad5 Compare August 13, 2025 15:50

Yury-Fridlyand reviewed Aug 13, 2025

View reviewed changes

jbrinkman added 8 commits August 13, 2025 14:36

test: Add integration tests for ConnectionMultiplexer ReadFrom mappin…

c71c278

…g functionality Signed-off-by: jbrinkman <[email protected]>

jbrinkman force-pushed the jbrinkman/az-affinity-configurationoptions-support branch from ae81ad5 to 353265e Compare August 13, 2025 18:37

jbrinkman added 2 commits August 13, 2025 15:07

test: Resolve stylecop lint errors

c69bd39

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feat: Add ReadFrom parsing support to ConfigurationOptions for AZ Affinity #28

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		private string? tempAz; // Temporary storage for AZ during parsing
		private ReadFromStrategy? tempReadFromStrategy; // Temporary storage for ReadFrom strategy during parsing


		var connectionTasks = new List<Task<(ConnectionMultiplexer Connection, ReadFromStrategy Strategy, string? Az)>>();

		var configurations = new[]

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jbrinkman commented Aug 13, 2025

Summary

Changes Made

Core Implementation

Supported ReadFrom Strategies

Connection String Examples

Test Coverage

Technical Details

Implementation Approach

Validation Rules

Backward Compatibility

Testing

Closes

Checklist

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