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fix: Create a connection string provider for each container - #1800
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…ete the instance overload
…ing-provider-shared-by-containers
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WalkthroughThe builder API now accepts connection-string provider factories and delegates. Container startup creates providers from those factories, and built-in builders use factory overloads. Five resource-mapping overloads are marked obsolete. ChangesConnection-string provider factories
Resource-mapping overload obsoletion
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ContainerBuilder
participant DockerContainer
participant ConnectionStringProviderFactory
ContainerBuilder->>DockerContainer: Configure provider factory
DockerContainer->>ConnectionStringProviderFactory: Create provider with container and configuration
ConnectionStringProviderFactory-->>DockerContainer: Return provider
Suggested reviewers: Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly and concisely describes the main change: creating a separate connection string provider for each container. |
| Description check | |
The description explains what changed, why it matters, the compatibility impact, and the obsolete API behavior. The recommended testing section is not completed, but the mandatory sections are complet… |
| Docstring Coverage | |
Docstring coverage is 90.36% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 83 functions across 60 files. (1 skipped: 1… |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
Full details: Description check
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Explanation
The description explains what changed, why it matters, the compatibility impact, and the obsolete API behavior. The recommended testing section is not completed, but the mandatory sections are complete.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 90.36% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 83 functions across 60 files. (1 skipped: 1 unsupported.)
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Inline comments:
Review comments at
@src/Testcontainers/Configurations/Containers/IContainerConfiguration.cs:
- Line 132: Restore the existing ConnectionStringProvider member on
IContainerConfiguration and the corresponding constructor parameter and property
on ContainerConfiguration as obsolete compatibility members, while retaining the
new factory API. Ensure existing callers and custom interface implementations
continue to compile.
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e1c32004-f9d4-4eeb-8910-54e28f13f102
📒 Files selected for processing: 10
docs/api/connection_string_provider.mdsrc/Testcontainers/Builders/ContainerBuilder3.cs`src/Testcontainers/Builders/IContainerBuilder2.cs`src/Testcontainers/Configurations/Containers/ConnectionStringProviderFactory2.cs`src/Testcontainers/Configurations/Containers/ContainerConfiguration.cssrc/Testcontainers/Configurations/Containers/DelegateConnectionStringProviderFactory2.cs`src/Testcontainers/Configurations/Containers/IConnectionStringProviderFactory2.cs`src/Testcontainers/Configurations/Containers/IContainerConfiguration.cssrc/Testcontainers/Containers/DockerContainer.cstests/Testcontainers.Platform.Linux.Tests/ConnectionStringProviderTest.cs
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What does this PR do?
The PR adds a
WithConnectionStringProvider(Func<IConnectionStringProvider<TContainerEntity, TConfigurationEntity>>)overload that accepts a factory instead of a provider instance. The builder stores an internal wrapper that holds the factory. Each time a container starts, the container creates its own provider from the factory and configures it for itself. All modules and the docs now use the factory overload. The existing overload that accepts a provider instance is marked obsolete. It passes a factory that always returns the same instance, so it keeps its previous behavior.Why is it important?
Containers built from the same builder shared one connection string provider instance. Every container start reconfigured that instance, so each container returned the connection string of the container that started last. For example, two PostgreSQL containers built from the same builder both returned the port of the second container. Creating a provider for each container makes every container return its own connection string.
Breaking changes
IContainerConfiguration.ConnectionStringProvideris replaced byConnectionStringProviderFactory, and theContainerConfigurationconstructor parameterconnectionStringProviderbyconnectionStringProviderFactory. Custom modules compiled against an earlier version must be recompiled.WithConnectionStringProvider(IConnectionStringProvider<TContainer, TConfiguration>)is obsolete. Containers built from the same builder share that provider instance. UseWithConnectionStringProvider(() => new MyProvider())or anIConnectionStringProviderFactory<TContainer, TConfiguration>to create one per container.Related issues
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Summary by CodeRabbit
New Features
Documentation
Compatibility