✨ added client builder #141
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WalkthroughThe recent update enhances the client connection configuration in the project by introducing a Changes
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- .gitignore (1 hunks)
- src/client.rs (3 hunks)
- src/lib.rs (1 hunks)
Additional comments: 4
src/lib.rs (1)
- 83-83: The addition of
ClientBuilderto the public exports is a significant change, making it accessible to users of the library. Ensure that the API ofClientBuilderis stable and well-documented, as it's now part of the public API.src/client.rs (3)
- 441-526: The
ClientBuilderstruct and its methods are well-structured and provide a flexible way to configure connection parameters. A few considerations:
- Ensure that all configurable parameters are documented, explaining their impact on the client's behavior.
- Consider adding validation for the parameters (e.g.,
max_sizeshould be positive) to prevent misconfiguration.- The
#[must_use]annotation on thebuildmethod is a good practice, encouraging users to handle the result properly.
- 76-78: The addition of the
buildermethod to theClientstruct is a key integration point for theClientBuilder. This method simplifies the creation of aClientinstance with custom configurations. Ensure that the method is documented, especially highlighting how it differs from theconnectmethod and when to use each.- 113-113: The modification of the
connectmethod to utilizeClientBuilderis a significant improvement, aligning with the PR's objectives to enhance flexibility and error resilience in client configuration. This change should be highlighted in the documentation, guiding users on the transition to the new configuration approach.
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Files skipped from review as they are similar to previous changes (1)
- src/lib.rs
Additional comments: 5
.gitignore (1)
- 7-7: The update to the
.gitignorefile correctly reflects the change in the memcached version used in the test setup. This ensures that the project's version control ignores are accurately aligned with the actual versions of external dependencies used in testing.src/client.rs (4)
- 76-78: The introduction of the
buildermethod in theClientstruct is a good design choice, facilitating a more flexible and error-resilient way of constructing client instances through theClientBuilder.- 113-113: Utilizing the
ClientBuilderin theconnectmethod of theClientstruct is a strategic enhancement. It improves the flexibility and error resilience of the client configuration process. Ensure that all existing calls toClient::connectare compatible with this change.- 441-526: The
ClientBuilderstruct and its methods for configuring connection parameters are well-implemented, following best practices for builder pattern design in Rust. However, thebuildmethod's current implementation does not return an error, despite being designed to accommodate potential future modifications that might introduce error conditions.Consider adding a comment explaining the rationale behind designing the
buildmethod to return aResulttype, even though it currently does not return an error. This will help future maintainers understand the design choice and ensure that the method's signature is forward-compatible with potential error conditions.
- 521-522: Setting the
read_timeoutandwrite_timeoutin thebuildmethod of theClientBuilderafter creating theClientinstance is a logical approach. However, it's important to ensure that these settings persist across dropped and re-established connections, as mentioned in the PR objectives. This might require additional logic in the connection management to re-apply these settings upon reconnection.
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src/client.rs
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| self | ||
| } | ||
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| #[must_use] |
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On second thought I'm wondering if this is truly needed. I don't imagine people would make a connection and just discard it.
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@coderabbitai review |
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Cargo.tomlis excluded by:!**/*.toml
Files selected for processing (3)
- .gitignore (1 hunks)
- src/client.rs (3 hunks)
- src/lib.rs (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- src/lib.rs
Additional comments: 3
.gitignore (1)
- 7-7: The update in the
.gitignorefile to referencememcached-1.6.9aligns with the PR objectives and ensures that the correct version is used in tests.src/client.rs (2)
- 441-526: The
ClientBuilderstruct and its methods are well-implemented, following the builder pattern to allow flexible configuration of theClient. The use of#[must_use]on thebuildmethod is a good practice to ensure that the method's result is not accidentally ignored. However, consider adding documentation comments to each method to explain their purpose and usage, enhancing maintainability and usability for other developers.- 73-82: > 📝 NOTE
This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [76-113]
The addition of the
buildermethod and the modification of theconnectmethod in theClientstruct to utilize theClientBuilderare correctly implemented. These changes enhance the flexibility and configurability of client connections. It's recommended to add documentation comments to thebuildermethod to explain its purpose and how it should be used, similar to the advice given for theClientBuildermethods.
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Hi, thank you for contribution, but can you add some basic test case for these newly added codes? And the coderabbitai is no quite useful now, please feel free to ignore it if you think it's wroung. |
I can add some unit tests to check the connection being created correctly, the connection itself then gets tested by the existing tests though. Would that be good? |
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Yes, please go ahead. |
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- src/client.rs (6 hunks)
Additional comments: 3
src/client.rs (3)
- 441-526: The
ClientBuilderstruct and its methods provide a fluent interface for configuring connection parameters. However, there are a few areas that could be improved for better code quality and maintainability:
Documentation: Each method in the
ClientBuildercould benefit from more detailed documentation, especially regarding the default values and the impact of each setting on the client's behavior.Error Handling in
buildMethod: Thebuildmethod uses.ok()?to silently ignore errors when parsing URLs and building connection pools. It might be more appropriate to return these errors to the caller to handle them accordingly.Pool Wait Timeout: The
pool_wait_timeoutfield is set but not used in thebuildmethod. If it's intended for future use, consider documenting its purpose or implementing its functionality.Test Coverage: Ensure that there are tests covering various configurations of the
ClientBuilder, especially edge cases and error scenarios.Usage of
#[must_use]: The#[must_use]attribute on thebuildmethod is a good practice. Consider adding a message to it, such as#[must_use = "The built client must be used or stored"]to provide more context.Consider these improvements to enhance the
ClientBuilderimplementation and its integration with theClient.
- 73-82: > 📝 NOTE
This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [76-113]
The integration of the
ClientBuilderwithin theClientstruct through thebuilderandconnectmethods is well-implemented. However, there's a potential improvement in theconnectmethod:
- Direct Use of
builderinconnect: Theconnectmethod directly delegates tobuilder(target).build(), which is concise but bypasses any additional configuration that might be done in thebuildermethod in the future. If thebuildermethod is expected to evolve, consider encapsulating the build process within it or providing a clear pathway for future enhancements.While the current implementation is functional, consider future-proofing the
builderandconnectintegration for potential enhancements.
- 438-554: > 📝 NOTE
This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [527-604]
The updated tests demonstrate the usage of the
ClientBuilderand validate its functionality. It's commendable that the tests cover various scenarios, including Unix sockets, TLS configurations, and basic operations like delete and increment. A few suggestions for the tests:
Negative Test Cases: Include tests that verify the behavior of the
ClientBuilderandClientwhen invalid configurations are provided, such as invalid URLs or unsupported parameters.Documentation: Adding comments to the tests explaining the purpose of each test case and the expected outcomes can improve readability and maintainability.
Refactoring: Some test cases are repeated for the direct
connectmethod and thebuildermethod. Consider refactoring these tests to reduce duplication and improve test coverage efficiency.Enhancing the test suite with negative test cases, better documentation, and refactoring can improve the robustness and clarity of the tests.
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I think the test code you added is a little bit redundant. I think they are not needed, and what I want to test is to check if the |
I'm not sure what you mean by building something and nothing is wrong, do you mean like using the builder and having the resulting connection not be configured the way the caller requested? |
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Yes, I think we should just test the build result is what we specified. |
I'm looking into adding tests for this but I am not seeing a clear path to do so. Please let me know if I'm misunderstanding something here. |
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- src/client.rs (6 hunks)
Additional comments: 3
src/client.rs (3)
- 76-78: The introduction of the
buildermethod in theClientstruct is a good practice as it provides a clear and fluent interface for constructing aClientinstance with customized settings. This approach enhances code readability and maintainability.- 113-113: The modification to the
connectmethod to utilize theClientBuilderfor constructing aClientinstance is a significant improvement. It leverages the builder pattern for more flexible and readable client configuration, aligning with modern Rust practices.- 492-523: The
buildmethod in theClientBuilderstruct correctly aggregates the configuration and constructs aClientinstance. However, it's important to ensure that the error handling strategy is consistent and robust, especially when dealing with external resources like connection pools. Consider explicitly handling potential errors during the pool creation process and returning a detailed error message to the caller.
src/client.rs
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| pub struct ClientBuilder<C: Connectable> { | ||
| target: C, | ||
| max_size: u32, | ||
| min_idle: Option<u32>, | ||
| max_lifetime: Option<Duration>, | ||
| read_timeout: Option<Duration>, | ||
| write_timeout: Option<Duration>, | ||
| } | ||
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| impl<C: Connectable> ClientBuilder<C> { | ||
| pub fn new(target: C) -> Self { | ||
| ClientBuilder { | ||
| target, | ||
| max_size: 1, | ||
| min_idle: None, | ||
| max_lifetime: None, | ||
| read_timeout: None, | ||
| write_timeout: None, | ||
| } | ||
| } | ||
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| /// Set the maximum number of connections managed by the pool. | ||
| pub fn max_pool_size(mut self, max_size: u32) -> Self { | ||
| self.max_size = max_size; | ||
| self | ||
| } | ||
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| /// Set the minimum number of idle connections to maintain in the pool. | ||
| pub fn min_idle_conns(mut self, min_idle: u32) -> Self { | ||
| self.min_idle = Some(min_idle); | ||
| self | ||
| } | ||
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| /// Set the maximum lifetime of connections in the pool. | ||
| pub fn max_conn_lifetime(mut self, max_lifetime: Duration) -> Self { | ||
| self.max_lifetime = Some(max_lifetime); | ||
| self | ||
| } | ||
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| /// Set the socket read timeout for TCP connections. | ||
| pub fn read_timeout(mut self, read_timeout: Duration) -> Self { | ||
| self.read_timeout = Some(read_timeout); | ||
| self | ||
| } | ||
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| /// Set the socket write timeout for TCP connections. | ||
| pub fn write_timeout(mut self, write_timeout: Duration) -> Self { | ||
| self.write_timeout = Some(write_timeout); | ||
| self | ||
| } | ||
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| /// Build the client. This will create a connection pool and return a client, or an error if the connection pool could not be created. | ||
| pub fn build(self) -> Result<Client, MemcacheError> { | ||
| let urls = self.target.get_urls(); | ||
| let max_size = self.max_size; | ||
| let min_idle = self.min_idle; | ||
| let max_lifetime = self.max_lifetime; | ||
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| let connections = urls | ||
| .iter() | ||
| .filter_map(|url| { | ||
| let url = Url::parse(url.as_str()).ok()?; | ||
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| r2d2::Pool::builder() | ||
| .max_size(max_size) | ||
| .min_idle(min_idle) | ||
| .max_lifetime(max_lifetime) | ||
| .connection_timeout(Duration::from_secs(30)) | ||
| .build(ConnectionManager::new(url)) | ||
| .ok() | ||
| }) | ||
| .collect(); | ||
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| let client = Client { | ||
| connections, | ||
| hash_function: default_hash_function, | ||
| }; | ||
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| client.set_read_timeout(self.read_timeout)?; | ||
| client.set_write_timeout(self.write_timeout)?; | ||
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| Ok(client) | ||
| } | ||
| } |
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The ClientBuilder struct and its implementation are well-designed, providing a fluent interface for configuring connection parameters. However, there are a few areas for improvement:
- The naming of the builder methods could be more consistent with Rust's conventions. For example,
max_pool_sizeandmin_idle_connscould be renamed towith_max_pool_sizeandwith_min_idle_connsto indicate that these methods are part of a builder pattern. - The
buildmethod's error handling could be enhanced. Currently, it silently ignores errors when parsing URLs and building the connection pool. It might be more appropriate to return an error if any URL is invalid or if the connection pool cannot be created for a specific URL.
- pub fn max_pool_size(mut self, max_size: u32) -> Self {
+ pub fn with_max_pool_size(mut self, max_size: u32) -> Self {
- pub fn min_idle_conns(mut self, min_idle: u32) -> Self {
+ pub fn with_min_idle_conns(mut self, min_idle: u32) -> Self {Consider improving error handling in the build method to ensure that failures in URL parsing or connection pool creation are communicated to the caller.
Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| pub struct ClientBuilder<C: Connectable> { | |
| target: C, | |
| max_size: u32, | |
| min_idle: Option<u32>, | |
| max_lifetime: Option<Duration>, | |
| read_timeout: Option<Duration>, | |
| write_timeout: Option<Duration>, | |
| } | |
| impl<C: Connectable> ClientBuilder<C> { | |
| pub fn new(target: C) -> Self { | |
| ClientBuilder { | |
| target, | |
| max_size: 1, | |
| min_idle: None, | |
| max_lifetime: None, | |
| read_timeout: None, | |
| write_timeout: None, | |
| } | |
| } | |
| /// Set the maximum number of connections managed by the pool. | |
| pub fn max_pool_size(mut self, max_size: u32) -> Self { | |
| self.max_size = max_size; | |
| self | |
| } | |
| /// Set the minimum number of idle connections to maintain in the pool. | |
| pub fn min_idle_conns(mut self, min_idle: u32) -> Self { | |
| self.min_idle = Some(min_idle); | |
| self | |
| } | |
| /// Set the maximum lifetime of connections in the pool. | |
| pub fn max_conn_lifetime(mut self, max_lifetime: Duration) -> Self { | |
| self.max_lifetime = Some(max_lifetime); | |
| self | |
| } | |
| /// Set the socket read timeout for TCP connections. | |
| pub fn read_timeout(mut self, read_timeout: Duration) -> Self { | |
| self.read_timeout = Some(read_timeout); | |
| self | |
| } | |
| /// Set the socket write timeout for TCP connections. | |
| pub fn write_timeout(mut self, write_timeout: Duration) -> Self { | |
| self.write_timeout = Some(write_timeout); | |
| self | |
| } | |
| /// Build the client. This will create a connection pool and return a client, or an error if the connection pool could not be created. | |
| pub fn build(self) -> Result<Client, MemcacheError> { | |
| let urls = self.target.get_urls(); | |
| let max_size = self.max_size; | |
| let min_idle = self.min_idle; | |
| let max_lifetime = self.max_lifetime; | |
| let connections = urls | |
| .iter() | |
| .filter_map(|url| { | |
| let url = Url::parse(url.as_str()).ok()?; | |
| r2d2::Pool::builder() | |
| .max_size(max_size) | |
| .min_idle(min_idle) | |
| .max_lifetime(max_lifetime) | |
| .connection_timeout(Duration::from_secs(30)) | |
| .build(ConnectionManager::new(url)) | |
| .ok() | |
| }) | |
| .collect(); | |
| let client = Client { | |
| connections, | |
| hash_function: default_hash_function, | |
| }; | |
| client.set_read_timeout(self.read_timeout)?; | |
| client.set_write_timeout(self.write_timeout)?; | |
| Ok(client) | |
| } | |
| } | |
| pub fn with_max_pool_size(mut self, max_size: u32) -> Self { | |
| self.max_size = max_size; | |
| self | |
| } | |
| pub fn with_min_idle_conns(mut self, min_idle: u32) -> Self { | |
| self.min_idle = Some(min_idle); | |
| self | |
| } |
Also added impl for `Connectable` on `Url`
| } | ||
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| #[test] | ||
| fn build_client_bad_url() { |
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I was able to come up with this, I do think it's much improved from what I previously wrote, as bad urls were just ignored from the list of connections without informing the caller
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- src/client.rs (7 hunks)
Additional comments: 10
src/client.rs (10)
- 447-454: The
ClientBuilderstruct is introduced to configure connection parameters flexibly. This is a positive change for enhancing configurability and future-proofing the client setup process.- 457-466: The
ClientBuilder::newmethod initializes the builder with default values. It's good practice to provide sensible defaults, ensuring a smooth user experience for common use cases.- 468-472: The method
with_max_pool_sizecorrectly sets the maximum number of connections managed by the pool. This method follows the builder pattern conventions in Rust, which is a good practice.- 474-478: The method
with_min_idle_connsallows setting the minimum number of idle connections, enhancing the flexibility of connection management. This is another example of the builder pattern being correctly applied.- 480-484: The method
with_max_conn_lifetimeintroduces the ability to set the maximum lifetime of connections in the pool. This addition is beneficial for managing resources effectively.- 486-490: The method
with_read_timeoutsets the socket read timeout for TCP connections. This is an important feature for controlling how long the client waits for a response.- 492-496: The method
with_write_timeoutsets the socket write timeout for TCP connections, complementing the read timeout setting and providing comprehensive timeout configuration.- 498-530: The
buildmethod inClientBuildercreates a connection pool and returns a client or an error if the pool could not be created. This method is crucial for the builder's functionality. However, it's noted that the method is designed to return aResulttype, even though it currently cannot fail. This design choice is made with future extensibility in mind, ensuring that any potential changes that could introduce errors in the future won't result in breaking changes. The function is also annotated with#[must_use]to encourage consumers to handle the result, enhancing error checking and future compatibility.- 535-539: The test
build_client_happy_pathverifies that a client can be successfully built using theClientBuilder. This is a basic test case that ensures the builder's primary functionality works as expected.- 541-544: The test
build_client_bad_urlchecks the builder's behavior when provided with an invalid URL. This test is important for ensuring error handling works correctly in the builder.
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Sorry, I'm new to gitmoji, which emotes should have been used for the failing commits? |
This doesn't matter, I will squash the commits when merge the commit, so only the PR title will be used as commit message. |
| max_size: 1, | ||
| min_idle: None, | ||
| max_lifetime: None, | ||
| read_timeout: None, | ||
| write_timeout: None, |
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I'd like to let these fields have the same name as the method names.
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This goes against the builder pattern, the method names would have with_ but not field names. If you still want them I can add them anyway though.
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Sorry, I made a misleading, I mean the method name without with_, like pool_max_size, but not the current max_size.
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Hi, I think this PR is almost done, except for the comments above, and the test case. I think we can just add some test cases. In these test cases, we can build a I'm not sure if these fields are accessble or not, if not, maybe we can found some other ways to make the test, but the goal should be same. |
Those fields are all private, but we can still test that the builder works |
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- src/client.rs (7 hunks)
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src/client.rs (1)
533-571: Thebuildmethod inClientBuilderis well-implemented, ensuring that aClientinstance is returned or an error if the connection pool could not be created. However, it's important to ensure that the error handling is comprehensive and informative for the user. Given the previous discussions about improving error handling, verify that all potential error cases are covered and that the errors returned are descriptive enough to help users diagnose issues.
src/client.rs
Outdated
| #[test] | ||
| fn build_client_happy_path() { | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345") | ||
| .build() | ||
| .unwrap(); | ||
| assert!(client.version().unwrap()[0].1 != ""); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_bad_url() { | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345:") | ||
| .build(); | ||
| assert!(client.is_err()); | ||
| } |
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The tests build_client_happy_path and build_client_bad_url effectively verify the basic functionality of the ClientBuilder. However, considering the discussion about adding more test cases, it would be beneficial to include tests that cover more scenarios, such as invalid configurations (e.g., setting a negative timeout) or edge cases in the connection parameters. This would ensure the robustness of the ClientBuilder implementation.
Would you like me to help draft additional test cases covering a wider range of scenarios for the ClientBuilder?
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The tests
build_client_happy_pathandbuild_client_bad_urleffectively verify the basic functionality of theClientBuilder. However, considering the discussion about adding more test cases, it would be beneficial to include tests that cover more scenarios, such as invalid configurations (e.g., setting a negative timeout) or edge cases in the connection parameters. This would ensure the robustness of theClientBuilderimplementation.Would you like me to help draft additional test cases covering a wider range of scenarios for the
ClientBuilder?
Yes
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#[cfg(test)]
mod additional_tests {
use super::*;
use std::time::Duration;
#[test]
fn build_client_with_negative_timeout() {
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_connection_timeout(Duration::from_secs(-1))
.build();
assert!(client.is_err(), "Expected error when setting a negative timeout");
}
#[test]
fn build_client_with_large_pool_size() {
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_max_pool_size(u32::MAX)
.build();
assert!(client.is_ok(), "Expected successful client creation with large pool size");
}
#[test]
fn build_client_with_custom_hash_function() {
fn custom_hash_function(_key: &str) -> u64 {
42 // A simple, predictable hash function for testing.
}
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_hash_function(custom_hash_function)
.build()
.unwrap();
// This test assumes that the custom hash function will affect the selection of connections.
// As the implementation details of connection selection are not exposed, this test might need to be adjusted.
assert_eq!((client.hash_function)("any_key"), 42, "Expected custom hash function to be used");
}
#[test]
fn build_client_with_unsupported_protocol() {
let client = Client::builder()
.add_server("unsupported://localhost:12345")
.build();
assert!(client.is_err(), "Expected error when using an unsupported protocol");
}
}These test cases cover a range of scenarios for the ClientBuilder, including handling of invalid configurations and the use of a custom hash function. Feel free to adjust these examples as needed to fit the specifics of your implementation and testing framework.
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@Shahab96, here are additional test cases for the ClientBuilder to cover a wider range of scenarios, including invalid configurations and edge cases in connection parameters:
#[cfg(test)]
mod additional_tests {
use super::*;
use std::time::Duration;
#[test]
fn build_client_exceed_max_pool_size() {
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_max_pool_size(u32::MAX)
.build();
assert!(client.is_ok(), "Should handle max pool size gracefully");
}
#[test]
fn build_client_negative_timeout() {
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_read_timeout(Duration::from_secs(u64::MAX))
.build();
assert!(client.is_err(), "Should fail on negative timeout");
}
#[test]
fn build_client_zero_min_idle_conns() {
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_min_idle_conns(0)
.build();
assert!(client.is_ok(), "Should handle zero min idle conns");
}
#[test]
fn build_client_invalid_hash_function() {
let invalid_hash_function = |_: &str| -> u64 { panic!("This should not be called"); };
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_hash_function(invalid_hash_function)
.build();
assert!(client.is_ok(), "Should handle custom hash function gracefully");
}
#[test]
fn build_client_with_all_optional_parameters() {
let client = Client::builder()
.add_server("memcache://localhost:12345")
.with_max_pool_size(10)
.with_min_idle_conns(2)
.with_max_conn_lifetime(Duration::from_secs(30))
.with_read_timeout(Duration::from_secs(5))
.with_write_timeout(Duration::from_secs(5))
.with_connection_timeout(Duration::from_secs(2))
.build();
assert!(client.is_ok(), "Should successfully build with all optional parameters");
}
}These tests aim to ensure that the ClientBuilder can handle various configurations and edge cases, such as handling maximum values, dealing with potential negative timeouts (simulated by using u64::MAX which would overflow), and ensuring that optional parameters are applied correctly.
It looks like there are ways we can test some of the items, like the connection timeout for example, by simulating activity. However since the current client implementation doesn't have these tests either, it's likely something to add to a separate PR, as this one is just for adding the builder. |
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src/client.rs (3)
491-494: The methodwith_max_pool_sizecorrectly sets the maximum pool size. However, the naming convention for builder pattern methods in Rust typically includes thewith_prefix, which you've followed here. This is good practice and aligns with Rust's conventions for builder patterns.
533-570: Thebuildmethod inClientBuilderis crucial for creating aClientinstance. It correctly aggregates the configuration and constructs theClient. However, it's important to ensure that error handling is robust, especially when parsing URLs and creating connection pools. Consider enhancing error handling to provide more detailed feedback to the caller in case of failure, such as invalid URLs or issues with connection pool creation.
576-591: The testsbuild_client_happy_path,build_client_bad_url,build_client_with_large_pool_size, andbuild_client_with_custom_hash_functioneffectively verify the basic functionality and error handling of theClientBuilder. It's good to see coverage for both successful paths and expected failures. Consider adding more tests to cover edge cases and invalid configurations to ensure the robustness of theClientBuilderimplementation.
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
| } | ||
| } | ||
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| impl Connectable for &[(&str, u16)] { |
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These two should allow consumers to either repeatedly call add_server with a single tuple, or with a slice of tuples. That'll take care of host:port specification.
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- src/client.rs (7 hunks)
- tests/setup_tests.sh (1 hunks)
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.gitignore (1)
7-7: The update from a specific version to a wildcard pattern for memcached directories in.gitignoreis a good practice. It simplifies management and ensures future versions are automatically ignored without needing additional updates.tests/setup_tests.sh (1)
5-5: Updating theMEMCACHED_VERSIONto "1.6.26" aligns with the PR objectives of ensuring compatibility with the latest memcached version. This is a straightforward and necessary update.src/client.rs (1)
21-37: The implementation of theConnectabletrait for various types ((&str, u16),&[(&str, u16)],Url,String,Vec<String>,&str,Vec<&str>) is a good practice. It provides flexibility in specifying connection targets for theClientBuilder. This approach enhances the usability of the API by accommodating different types of input.
src/client.rs
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| write_timeout: None, | ||
| connection_timeout: None, | ||
| hash_function: default_hash_function, | ||
| } | ||
| } | ||
|
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| /// Add a memcached server to the pool. | ||
| pub fn add_server<C: Connectable>(mut self, target: C) -> Self { | ||
| self.target.extend(target.get_urls()); | ||
| self | ||
| } | ||
|
|
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| /// Set the maximum number of connections managed by the pool. | ||
| pub fn with_max_pool_size(mut self, max_size: u32) -> Self { | ||
| self.max_size = max_size; | ||
| self | ||
| } | ||
|
|
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| /// Set the minimum number of idle connections to maintain in the pool. | ||
| pub fn with_min_idle_conns(mut self, min_idle: u32) -> Self { | ||
| self.min_idle = Some(min_idle); | ||
| self | ||
| } | ||
|
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| /// Set the maximum lifetime of connections in the pool. | ||
| pub fn with_max_conn_lifetime(mut self, max_lifetime: Duration) -> Self { | ||
| self.max_lifetime = Some(max_lifetime); | ||
| self | ||
| } | ||
|
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| /// Set the socket read timeout for TCP connections. | ||
| pub fn with_read_timeout(mut self, read_timeout: Duration) -> Self { | ||
| self.read_timeout = Some(read_timeout); | ||
| self | ||
| } | ||
|
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| /// Set the socket write timeout for TCP connections. | ||
| pub fn with_write_timeout(mut self, write_timeout: Duration) -> Self { | ||
| self.write_timeout = Some(write_timeout); | ||
| self | ||
| } | ||
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| /// Set the connection timeout for TCP connections. | ||
| pub fn with_connection_timeout(mut self, connection_timeout: Duration) -> Self { | ||
| self.connection_timeout = Some(connection_timeout); | ||
| self | ||
| } | ||
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| /// Set the hash function for the client. | ||
| pub fn with_hash_function(mut self, hash_function: fn(&str) -> u64) -> Self { | ||
| self.hash_function = hash_function; | ||
| self | ||
| } | ||
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| /// Build the client. This will create a connection pool and return a client, or an error if the connection pool could not be created. | ||
| pub fn build(self) -> Result<Client, MemcacheError> { | ||
| let urls = self.target.get_urls(); | ||
| let max_size = self.max_size; | ||
| let min_idle = self.min_idle; | ||
| let max_lifetime = self.max_lifetime; | ||
| let timeout = self.connection_timeout; | ||
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| let mut connections = vec![]; | ||
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| for url in urls.iter() { | ||
| let url = Url::parse(url.as_str()).map_err(|e| MemcacheError::BadURL(e.to_string()))?; | ||
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| match url.scheme() { | ||
| "memcache" | "memcache+tls" | "memcache+udp" => {} | ||
| _ => { | ||
| return Err(MemcacheError::BadURL(format!("Unsupported protocol: {}", url.scheme()))); | ||
| } | ||
| } | ||
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| let mut builder = r2d2::Pool::builder() | ||
| .max_size(max_size) | ||
| .min_idle(min_idle) | ||
| .max_lifetime(max_lifetime); | ||
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| if let Some(timeout) = timeout { | ||
| builder = builder.connection_timeout(timeout); | ||
| } | ||
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| let connection = builder | ||
| .build(ConnectionManager::new(url)) | ||
| .map_err(|e| MemcacheError::PoolError(e))?; | ||
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| connections.push(connection); | ||
| } | ||
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| let client = Client { | ||
| connections, | ||
| hash_function: self.hash_function, | ||
| }; | ||
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| client.set_read_timeout(self.read_timeout)?; | ||
| client.set_write_timeout(self.write_timeout)?; | ||
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| Ok(client) | ||
| } |
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The ClientBuilder struct and its methods are well-designed, providing a fluent interface for configuring connection parameters. However, there are a few areas for improvement:
-
Consistency in Method Naming: The naming of the builder methods could be more consistent with Rust's conventions. For example,
with_max_pool_sizeandwith_min_idle_connscould be renamed towith_max_pool_sizeandwith_min_idle_connsto indicate that these methods are part of a builder pattern. -
Error Handling in
buildMethod: Thebuildmethod's error handling could be enhanced. Currently, it silently ignores errors when parsing URLs and building the connection pool. It might be more appropriate to return an error if any URL is invalid or if the connection pool cannot be created for a specific URL.
- pub fn max_pool_size(mut self, max_size: u32) -> Self {
+ pub fn with_max_pool_size(mut self, max_size: u32) -> Self {
- pub fn min_idle_conns(mut self, min_idle: u32) -> Self {
+ pub fn with_min_idle_conns(mut self, min_idle: u32) -> Self {Consider improving error handling in the build method to ensure that failures in URL parsing or connection pool creation are communicated to the caller.
Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation.
| pub struct ClientBuilder { | |
| target: Vec<String>, | |
| max_size: u32, | |
| min_idle: Option<u32>, | |
| max_lifetime: Option<Duration>, | |
| read_timeout: Option<Duration>, | |
| write_timeout: Option<Duration>, | |
| connection_timeout: Option<Duration>, | |
| hash_function: fn(&str) -> u64, | |
| } | |
| impl ClientBuilder { | |
| /// Create an empty client builder. | |
| pub fn new() -> Self { | |
| ClientBuilder { | |
| target: vec![], | |
| max_size: 1, | |
| min_idle: None, | |
| max_lifetime: None, | |
| read_timeout: None, | |
| write_timeout: None, | |
| connection_timeout: None, | |
| hash_function: default_hash_function, | |
| } | |
| } | |
| /// Add a memcached server to the pool. | |
| pub fn add_server<C: Connectable>(mut self, target: C) -> Self { | |
| self.target.extend(target.get_urls()); | |
| self | |
| } | |
| /// Set the maximum number of connections managed by the pool. | |
| pub fn with_max_pool_size(mut self, max_size: u32) -> Self { | |
| self.max_size = max_size; | |
| self | |
| } | |
| /// Set the minimum number of idle connections to maintain in the pool. | |
| pub fn with_min_idle_conns(mut self, min_idle: u32) -> Self { | |
| self.min_idle = Some(min_idle); | |
| self | |
| } | |
| /// Set the maximum lifetime of connections in the pool. | |
| pub fn with_max_conn_lifetime(mut self, max_lifetime: Duration) -> Self { | |
| self.max_lifetime = Some(max_lifetime); | |
| self | |
| } | |
| /// Set the socket read timeout for TCP connections. | |
| pub fn with_read_timeout(mut self, read_timeout: Duration) -> Self { | |
| self.read_timeout = Some(read_timeout); | |
| self | |
| } | |
| /// Set the socket write timeout for TCP connections. | |
| pub fn with_write_timeout(mut self, write_timeout: Duration) -> Self { | |
| self.write_timeout = Some(write_timeout); | |
| self | |
| } | |
| /// Set the connection timeout for TCP connections. | |
| pub fn with_connection_timeout(mut self, connection_timeout: Duration) -> Self { | |
| self.connection_timeout = Some(connection_timeout); | |
| self | |
| } | |
| /// Set the hash function for the client. | |
| pub fn with_hash_function(mut self, hash_function: fn(&str) -> u64) -> Self { | |
| self.hash_function = hash_function; | |
| self | |
| } | |
| /// Build the client. This will create a connection pool and return a client, or an error if the connection pool could not be created. | |
| pub fn build(self) -> Result<Client, MemcacheError> { | |
| let urls = self.target.get_urls(); | |
| let max_size = self.max_size; | |
| let min_idle = self.min_idle; | |
| let max_lifetime = self.max_lifetime; | |
| let timeout = self.connection_timeout; | |
| let mut connections = vec![]; | |
| for url in urls.iter() { | |
| let url = Url::parse(url.as_str()).map_err(|e| MemcacheError::BadURL(e.to_string()))?; | |
| match url.scheme() { | |
| "memcache" | "memcache+tls" | "memcache+udp" => {} | |
| _ => { | |
| return Err(MemcacheError::BadURL(format!("Unsupported protocol: {}", url.scheme()))); | |
| } | |
| } | |
| let mut builder = r2d2::Pool::builder() | |
| .max_size(max_size) | |
| .min_idle(min_idle) | |
| .max_lifetime(max_lifetime); | |
| if let Some(timeout) = timeout { | |
| builder = builder.connection_timeout(timeout); | |
| } | |
| let connection = builder | |
| .build(ConnectionManager::new(url)) | |
| .map_err(|e| MemcacheError::PoolError(e))?; | |
| connections.push(connection); | |
| } | |
| let client = Client { | |
| connections, | |
| hash_function: self.hash_function, | |
| }; | |
| client.set_read_timeout(self.read_timeout)?; | |
| client.set_write_timeout(self.write_timeout)?; | |
| Ok(client) | |
| } |
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Bad feedback
- Url parsing error is mapped and returned via the
?operator. - The suggestion is to delete the builder.
There was a problem hiding this comment.
@Shahab96, I'm here to assist in enhancing the code and ensuring best practices. If there are specific aspects of the feedback you disagree with or if you have alternative suggestions, I'd be glad to discuss them further. Your insights are valuable, and I'm here to support you in making the best decisions for your project. Could you please share more details about your concerns?
src/client.rs
Outdated
| #[test] | ||
| fn build_client_happy_path() { | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345") | ||
| .build() | ||
| .unwrap(); | ||
| assert!(client.version().unwrap()[0].1 != ""); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_bad_url() { | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345:") | ||
| .build(); | ||
| assert!(client.is_err()); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_with_large_pool_size() { | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345") | ||
| // This is a large pool size, but it should still be valid. | ||
| // This does make the test run very slow however. | ||
| .with_max_pool_size(100) | ||
| .build(); | ||
| assert!( | ||
| client.is_ok(), | ||
| "Expected successful client creation with large pool size" | ||
| ); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_with_custom_hash_function() { | ||
| fn custom_hash_function(_key: &str) -> u64 { | ||
| 42 // A simple, predictable hash function for testing. | ||
| } | ||
|
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| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345") | ||
| .with_hash_function(custom_hash_function) | ||
| .build() | ||
| .unwrap(); | ||
|
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| // This test assumes that the custom hash function will affect the selection of connections. | ||
| // As the implementation details of connection selection are not exposed, this test might need to be adjusted. | ||
| assert_eq!( | ||
| (client.hash_function)("any_key"), | ||
| 42, | ||
| "Expected custom hash function to be used" | ||
| ); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_zero_min_idle_conns() { | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345") | ||
| .with_min_idle_conns(0) | ||
| .build(); | ||
| assert!(client.is_ok(), "Should handle zero min idle conns"); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_invalid_hash_function() { | ||
| let invalid_hash_function = |_: &str| -> u64 { | ||
| panic!("This should not be called"); | ||
| }; | ||
| let client = super::Client::builder() | ||
| .add_server("memcache://localhost:12345") | ||
| .with_hash_function(invalid_hash_function) | ||
| .build(); | ||
| assert!(client.is_ok(), "Should handle custom hash function gracefully"); | ||
| } | ||
|
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| #[test] | ||
| fn build_client_with_unsupported_protocol() { | ||
| let client = super::Client::builder() | ||
| .add_server("unsupported://localhost:12345") | ||
| .build(); | ||
| assert!(client.is_err(), "Expected error when using an unsupported protocol"); | ||
| } |
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The tests for the ClientBuilder (build_client_happy_path, build_client_bad_url, build_client_with_large_pool_size, build_client_with_custom_hash_function, build_client_zero_min_idle_conns, build_client_invalid_hash_function, build_client_with_unsupported_protocol, build_client_with_all_optional_parameters) effectively verify the basic functionality and error handling of the ClientBuilder. However, considering the discussion about adding more test cases, it would be beneficial to include tests that cover more scenarios, such as invalid configurations (e.g., setting a negative timeout) or edge cases in the connection parameters. This would ensure the robustness of the ClientBuilder implementation.
Would you like me to help draft additional test cases covering a wider range of scenarios for the ClientBuilder?
There was a problem hiding this comment.
@Shahab96, understood. If you have any other requests or need assistance in the future, feel free to let me know.
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- src/client.rs (4 hunks)
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src/client.rs (3)
459-588: TheClientBuilderstruct and its methods provide a fluent interface for configuring and building aClientinstance. However, there are several areas for improvement and clarification:
Error Handling in
add_serverandbuildMethods: Both methods perform URL validation but handle potential errors differently. It's good practice to ensure consistent error handling across the builder pattern. Consider refining the error messages for clarity and actionability.Method Naming Consistency: The method names like
with_max_pool_size,with_min_idle_conns, etc., follow the builder pattern naming convention well. However, ensure that all builder methods that set properties follow this naming convention for consistency.Documentation and Examples: While the methods have comments, adding more detailed documentation, especially for the
buildmethod, would be beneficial. Including examples of handling errors returned by thebuildmethod could improve usability.Validation of Configuration Values: Currently, there's no visible validation for the configuration values (e.g., negative timeouts, excessively large pool sizes). Adding validation steps could prevent runtime issues and provide clearer errors during the build process.
Connection Protocol Validation: The validation of supported protocols (
"memcache","memcache+tls","memcache+udp") in thebuildmethod is crucial. Consider extracting this into a separate method for clarity and potential reuse.Setting Timeouts on Client: The
buildmethod sets read and write timeouts on theClientafter its creation. This approach works but consider if there's a more integrated way to handle this within theClient's initialization to encapsulate all configuration steps within the builder.Consider these points to enhance the
ClientBuilder's usability, error handling, and documentation.
21-37: The implementations of theConnectabletrait for different types ((&str, u16),&[(&str, u16)],Url) are concise and serve their purpose well. However, consider the following for potential improvement:
Consistency in Return Statements: The
returnkeyword is used explicitly in these implementations, which is not necessary in Rust when returning the last expression in a block. Removingreturnand the semicolon for the last expression can make the code more idiomatic.Error Handling for URL Construction: For the tuple and array implementations, the format is straightforward and unlikely to fail. However, consider scenarios where URL construction might fail due to invalid inputs and how these cases are handled or reported.
Consider making the return statements more idiomatic by omitting the explicit
returnkeyword where possible.
594-707: The tests for theClientBuildercover various scenarios, including happy paths, bad URLs, unsupported protocols, and custom configurations. These tests are well-structured and provide good coverage of the builder's functionality. However, consider the following points for further enhancement:
Negative and Edge Case Testing: While some tests cover error scenarios (e.g.,
build_client_bad_url,build_client_with_unsupported_protocol), adding more tests for negative and edge cases, such as invalid configuration values (e.g., negative timeouts), could further ensure the robustness of the builder.Documentation and Comments: Adding comments to the tests explaining the purpose and expected outcomes can improve readability and maintainability, especially for more complex scenarios.
Test Organization: As the number of tests grows, organizing them into submodules or using a more descriptive naming convention could help manage the test suite more effectively.
Enhance the test suite by adding more negative and edge case tests, improving documentation, and considering test organization strategies.
|
Thank you for your contribution! |
resolves #107
Summary by CodeRabbit
New Features
ClientBuilderfor customizable configurations.Refactor
Chores
.gitignoreto reference the latestmemcachedversion.