Middleware support #8
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WalkthroughThis update advances the Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Provider
participant Target
participant ReqwestClient
participant Middleware as ClientWithMiddleware
participant Error
User->>Provider: new(..., timeout, ...)
User->>Provider: request(target)
Provider->>Target: base_url(), path(), query(), headers(), authentication(), body()
Target-->>Provider: String, HashMap<String, String>, Option<AuthMethod>, Result<HTTPBody, Error>
Provider->>ReqwestClient: build RequestBuilder (or Middleware)
ReqwestClient-->>Provider: RequestBuilder
Provider->>ReqwestClient: execute request
ReqwestClient-->>Provider: Result<Response, reqwest::Error>
Provider-->>User: Result<Response, Error>
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Hello @hewigovens, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
Gemini or gemini-code-assist here, providing a summary for this pull request. This PR introduces support for reqwest-middleware to the reqwest-enum library, allowing users to add middleware layers to their HTTP clients. It also includes significant improvements to error handling by introducing a custom Error enum using thiserror, enhances the flexibility of the Target trait by allowing String for URLs, queries, and headers, and adds a custom authentication method. The library version is bumped to 0.4.0 to reflect these changes.
Highlights
- Middleware Support: Adds an optional
middlewarefeature that integratesreqwest-middleware, enabling users to chain middleware layers for requests. - Improved Error Handling: Introduces a new
Errorenum usingthiserrorto provide more structured and informative error reporting, wrapping underlyingreqwest,reqwest-middleware, andserde_jsonerrors. - Flexible Target Trait: Updates the
Targettrait to useStringforbase_url,query, andheaders, removing the'staticlifetime constraint. Thebodymethod now returns aResultto handle potential serialization errors, and thetimeoutmethod has been removed from the trait (timeout is now handled at the Provider level). - Custom Authentication Method: Adds a new
AuthMethod::Customvariant and a helperheader_api_keyfunction to allow more flexible authentication logic. - Version Bump: The library version is updated from 0.3.3 to 0.4.0, indicating breaking changes due to the trait and API modifications.
Changelog
Click here to see the changelog
- Cargo.lock
- Added new dependencies:
anyhow(1.0.98),async-trait(0.1.88),reqwest-middleware(0.4.2),thiserror(1.0.69, 2.0.12),thiserror-impl(1.0.69, 2.0.12). - Updated existing dependencies:
ethereum-rpc(0.3.3 -> 0.4.0),reqwest-enum(0.3.3 -> 0.4.0),syn(2.0.79 -> 2.0.87).
- Added new dependencies:
- Cargo.toml
- Updated workspace version to 0.4.0 and edition to 2024.
- Added
middlewarefeature depending onreqwest-middleware. - Added
thiserror = "2.0.12"as a dependency. - Added
reqwest-middleware = { version = "0.4.2", optional = true }as a dependency.
- examples/ethereum-rpc/src/ethereum_rpc.rs
- Removed unused
extern crateandDurationimport (lines 1-2, 10). - Changed
base_urlreturn type inTargetimpl from&'static strtoString(line 144). - Changed
queryandheadersreturn types inTargetimpl fromHashMap<&'static str, &'static str>toHashMap<String, String>(lines 156, 160). - Changed
bodyreturn type inTargetimpl fromHTTPBodytoResult<HTTPBody, reqwest_enum::Error>and updated implementation to useHTTPBody::fromwhich now returns aResult(line 170). - Removed
timeoutmethod implementation fromTargettrait (lines 177-180).
- Removed unused
- reqwest-enum/Cargo.toml
- Added
thiserrorandreqwest-middlewaredependencies (lines 20, 26). - Added
middlewarefeature (line 17).
- Added
- reqwest-enum/src/error.rs
- Added a new file defining the
Errorenum usingthiserror(lines 1-15).
- Added a new file defining the
- reqwest-enum/src/http.rs
- Changed
HTTPBody::fromandfrom_arraymethods to returnResult<Self, serde_json::Error>(lines 59, 65). - Changed
AuthMethod::Basicvariant to acceptStringandOption<String>(line 74). - Added
AuthMethod::Customvariant for custom authentication logic (line 78). - Added
AuthMethod::header_api_keyhelper function (lines 81-88). - Implemented
DebugforAuthMethod(lines 91-102).
- Changed
- reqwest-enum/src/jsonrpc.rs
- Removed
#[cfg(feature = "jsonrpc")]attributes fromJsonRpcRequest,JsonRpcResponse,JsonRpcErrorResponse,JsonRpcError,JsonRpcIdstructs/enums and their implementations (lines 4, 14, 40, 49, 57, 64, 67, 83, 91). - Removed
From<JsonRpcRequest> for HTTPBodyimplementation (lines 33-38). - Added
From<crate::Error> for JsonRpcErrorimplementation to convert the new library error type (lines 60-77).
- Removed
- reqwest-enum/src/lib.rs
- Added
errormodule declaration and re-exportedError(lines 1-2).
- Added
- reqwest-enum/src/provider.rs
- Imported
Errorfrom crate root (line 12). - Imported
Duration(line 13). - Conditionally imported
ClientWithMiddlewareandMiddlewareClientBuilderbased onmiddlewarefeature (lines 17-18). - Updated
Providerstruct to includetimeoutfield and useClientWithMiddlewareconditionally (lines 57-61). - Updated
ProviderType::requestimplementation to handleResultfromtarget.body()and use the client'sexecutemethod (lines 68-71). - Updated
JsonRpcProviderType::batchandbatch_chunk_byimplementations to handleResultfromHTTPBody::from_arrayand use the client'sexecutemethod (lines 116, 123, 127, 159, 164). - Updated
Provider::newand addedwith_clientmethods to handle the conditional middleware client and the newtimeoutparameter (lines 194-239). - Changed
request_builderto returnResult<reqwest::RequestBuilder, Error>and moved body serialization and timeout application into this method (lines 249-286). - Updated
Defaultimplementation forProviderto handle the conditional middleware client andtimeout(lines 294-305). - Updated test cases (
test_request_builder_with_endpoint_fn,test_request_builder_with_request_fn) to match the newProvider::newsignature andrequest_builderreturn type (lines 407, 425, 428). - Added
HeaderAuthvariant toHttpBinenum for testing custom header authentication (line 334). - Updated
Targetimpl forHttpBinto handleHeaderAuth(lines 347, 360, 385). - Added
AuthMethod::header_api_keyusage inHttpBin::authenticationforHeaderAuth(lines 375-378). - Added
test_header_api_key_authtest case (lines 449-465).
- Imported
- reqwest-enum/src/target.rs
- Imported
Errorfrom crate root (line 2). - Removed
timeoutmethod from theTargettrait (line 12). - Changed
base_url,query, andheadersmethod signatures to returnStringandHashMap<String, String>respectively (lines 8, 11, 12). - Changed
bodymethod signature to returnResult<HTTPBody, Error>(line 14). - Updated
query_stringto collect intoVec<String>(line 21).
- Imported
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Pull Request Overview
Adds middleware support via reqwest-middleware, centralizes error handling, and refactors request building and target definitions.
- Updated
Targettrait to use ownedStringtypes and return a falliblebody() - Introduced a unified
Errorenum and conditional middleware client inProvider - Refactored request building to support timeouts, custom authentication, and JSON-RPC batch error mapping
Reviewed Changes
Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| reqwest-enum/src/target.rs | Changed trait signatures to owned types and fallible bodies |
| reqwest-enum/src/provider.rs | Integrated middleware client, added timeout handling, refactored builder |
| reqwest-enum/src/http.rs | Made HTTPBody constructors return Result, extended AuthMethod |
| reqwest-enum/src/error.rs | Added Error enum for unified error conversion |
| reqwest-enum/src/lib.rs | Exposed new error module |
| reqwest-enum/src/jsonrpc.rs | Mapped crate::Error to JsonRpcError |
| reqwest-enum/Cargo.toml | Added middleware feature, bumped dependencies |
| examples/ethereum-rpc/src/ethereum_rpc.rs | Updated example to new Target and error signatures |
| Cargo.toml | Bumped workspace version and edition |
Comments suppressed due to low confidence (2)
reqwest-enum/src/provider.rs:163
- Calling
send()on theRequestBuilderbypasses the middleware client in batch operations. Instead, build theRequestand useself.client.execute(...)so that middleware layers are applied to batch requests as well.
let response = request.send().await?;
reqwest-enum/src/http.rs:92
- Debug printing the password exposes sensitive credentials in logs. Consider masking or omitting the password field in the
Debugimplementation.
AuthMethod::Basic(username, password) => f.debug_tuple("Basic").field(username).field(password).finish(),
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Code Review
This pull request introduces middleware support to reqwest-enum, a significant enhancement that also brings along improved error handling and API flexibility. Key changes include the integration of reqwest-middleware, a new Error enum, and updates to the Target trait and Provider implementation.
The introduction of AuthMethod::Custom and Provider::with_client are excellent additions for extensibility. The move towards String types for various parameters and Result for fallible operations generally improves robustness.
However, there are a few points, including some breaking changes and a potentially premature Rust edition update, that warrant discussion and consideration.
Summary of Findings
- Rust Edition Update: The workspace is updated to Rust Edition 2024, which is not yet stable. This could impact users on stable toolchains.
- Error Handling in
FromImplementation: AFrom<JsonRpcRequest> for reqwest::Bodyimplementation uses.unwrap(), which could panic. Consider a fallible conversion for library code. - Temporary Client Creation: A temporary
reqwest::Clientis created inrequest_builderon each call. This is likely a workaround for middleware integration but worth confirming if it's optimal. - Removal of
Target::timeout(): Thetimeout()method was removed from theTargettrait, centralizing timeout logic to theProvideror requiring manual handling viarequest_fnfor per-request timeouts. This impacts flexibility. - Breaking Changes: The PR includes several breaking changes to the
Targettrait and other public APIs, which is expected for a0.x.0version bump introducing new features but should be clearly communicated to users.
Merge Readiness
This pull request introduces valuable middleware support and other improvements. However, before merging, I recommend addressing the concern about the Rust Edition 2024 update, as it could be a blocker for users on stable toolchains. The medium-severity points regarding Target::timeout() removal, unwrap() usage, and temp_client creation should also be considered for potential refinement or clarification.
I am unable to approve pull requests directly. Please ensure these points are discussed and, if necessary, addressed, and that other reviewers provide their approval before merging.
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Actionable comments posted: 4
🔭 Outside diff range comments (3)
reqwest-enum/src/provider.rs (3)
147-162:⚠️ Potential issueFix request builder handling in batch_chunk_by.
Similar issues to the batch method with Result wrapping:
let target = &chunk[0]; -let mut request = self.request_builder(target); +let mut request = self.request_builder(target)?; let mut requests = Vec::<JsonRpcRequest>::new(); for (k, v) in chunk.iter().enumerate() { let request = JsonRpcRequest::new( v.method_name(), v.params(), (chunk_idx * chunk_size + k + 1) as u64, ); requests.push(request); } let http_body = HTTPBody::from_array(&requests).map_err(|e| JsonRpcError { code: -32700, message: format!("Failed to serialize batch chunk: {}", e) })?; -request = Ok(request?.body(http_body.inner)); -rpc_requests.push(request?); +request = request.body(http_body.inner); +rpc_requests.push(request);
163-168:⚠️ Potential issueUse self.client for request execution to support middleware.
The current implementation uses
RequestBuilder::send()which bypasses the configured client and any middleware.Refactor to build requests and execute them through self.client:
-let bodies = join_all(rpc_requests.into_iter().map(|request| async move { - let response = request.send().await?; - let body = response.json::<Vec<JsonRpcResult<U>>>().await?; - Ok(body) -})) +let bodies = join_all(rpc_requests.into_iter().map(|request_builder| { + let client = self.client.clone(); + async move { + let request = request_builder.build()?; + let response = client.execute(request).await?; + let body = response.json::<Vec<JsonRpcResult<U>>>().await?; + Ok::<Vec<JsonRpcResult<U>>, crate::Error>(body) + } +}))This ensures middleware and client configuration are properly applied.
169-186: 🛠️ Refactor suggestionImprove error handling to preserve all chunk errors.
The current implementation only returns the last error if multiple chunks fail, losing valuable debugging information.
Consider collecting all errors or returning the first error:
let mut results = Vec::<JsonRpcResult<U>>::new(); -let mut error: Option<JsonRpcError> = None; +let mut errors = Vec::<JsonRpcError>::new(); for result in bodies { match result { Ok(body) => { results.extend(body); } Err(err) => { - error = Some(err); + errors.push(err.into()); } } } -if let Some(err) = error { - return Err(err); +if !errors.is_empty() { + // Return first error with count of total errors + let mut first_err = errors.into_iter().next().unwrap(); + if errors.len() > 1 { + first_err.message = format!("{} (and {} more errors)", first_err.message, errors.len() - 1); + } + return Err(first_err); } Ok(results)
🧹 Nitpick comments (1)
reqwest-enum/src/jsonrpc.rs (1)
60-78: LGTM with suggestion for error code specificityThe error conversion implementation correctly handles the different error variants from the unified
Errorenum. The delegation to existingFrom<reqwest::Error>forJsonRpcErroris appropriate, and the conditional compilation for middleware errors is properly handled.Consider using more specific JSON-RPC error codes:
-32700for parse errors (whenSerdeJsonerrors are parsing-related)-32603for internal errors (current usage is appropriate for middleware and general serialization errors)crate::Error::SerdeJson(e) => JsonRpcError { - code: -32603, // Internal error (could also be Parse error -32700 depending on context) + code: -32700, // Parse error - more appropriate for serialization errors message: format!("Serialization/deserialization error: {}", e), },
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⛔ Files ignored due to path filters (1)
Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (9)
Cargo.toml(1 hunks)examples/ethereum-rpc/src/ethereum_rpc.rs(3 hunks)reqwest-enum/Cargo.toml(1 hunks)reqwest-enum/src/error.rs(1 hunks)reqwest-enum/src/http.rs(1 hunks)reqwest-enum/src/jsonrpc.rs(1 hunks)reqwest-enum/src/lib.rs(1 hunks)reqwest-enum/src/provider.rs(11 hunks)reqwest-enum/src/target.rs(1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (2)
reqwest-enum/src/target.rs (2)
examples/ethereum-rpc/src/ethereum_rpc.rs (7)
base_url(144-146)method(148-150)path(152-154)query(156-158)headers(160-164)authentication(166-168)body(170-175)reqwest-enum/src/provider.rs (7)
base_url(338-340)method(342-349)path(351-362)query(364-366)headers(368-370)authentication(372-381)body(383-395)
reqwest-enum/src/provider.rs (3)
reqwest-enum/src/jsonrpc.rs (4)
from(24-26)from(52-57)from(61-77)new(13-20)reqwest-enum/src/http.rs (4)
from(44-55)from(59-63)from_array(65-69)header_api_key(82-88)reqwest-enum/src/target.rs (8)
body(14-14)base_url(8-8)path(10-10)method(9-9)query(11-11)query(18-21)headers(12-12)authentication(13-13)
🔇 Additional comments (15)
Cargo.toml (1)
2-2: Version bump is appropriate.The version bump from 0.3.3 to 0.4.0 correctly reflects the addition of middleware support as a significant new feature.
reqwest-enum/src/lib.rs (1)
1-2: Well-designed error handling infrastructure.The addition of a centralized error module with public re-export follows Rust best practices and provides a clean API for unified error handling across the crate.
reqwest-enum/Cargo.toml (1)
17-17: Well-designed optional middleware feature.The conditional dependency on
reqwest-middlewarethrough themiddlewarefeature flag provides good flexibility for users who don't need middleware support.reqwest-enum/src/error.rs (1)
1-15: Excellent error handling design.The
Errorenum demonstrates excellent Rust error handling practices:
- Uses
thiserrorfor clean error trait derivation- Provides descriptive error messages with context
- Enables automatic conversions with
#[from]attributes- Conditionally compiles middleware errors only when the feature is enabled
- Covers all major error sources (HTTP, middleware, serialization)
This creates a robust foundation for error propagation throughout the crate.
reqwest-enum/src/target.rs (3)
1-5: Clean import organizationThe updated imports correctly include the new
Errortype and maintain clean organization with the http module imports.
8-14: Excellent API evolution towards owned data and error handlingThe trait changes represent a well-thought-out evolution:
- Owned
Stringtypes provide greater flexibility for implementations- Fallible
body()method enables proper error propagation- Consistent use of
HashMap<String, String>for headers and query parametersThese changes align well with the broader crate refactor towards explicit error handling.
17-23: Helper method correctly adapted for owned stringsThe
query_stringmethod properly handles the transition fromVec<&str>toVec<String>in the collect operation, maintaining the same functionality with the new owned string types.examples/ethereum-rpc/src/ethereum_rpc.rs (4)
1-9: Clean import reorganizationThe import updates correctly reflect the new API structure, with explicit
HTTPBodyimport and proper use ofHashMapfrom std collections.
144-145: Correct adaptation to owned string APIThe
base_urlmethod properly returns an ownedStringusing.to_string(), aligning with the updatedTargettrait signature.
156-164: Proper implementation of owned string collectionsBoth
queryandheadersmethods correctly useHashMap<String, String>with owned strings. The header insertion properly converts both key and value to owned strings.
170-175: Excellent error handling integrationThe
bodymethod correctly:
- Returns
Result<HTTPBody, reqwest_enum::Error>- Uses the
?operator for error propagation fromHTTPBody::from(&req)?- Maintains the same logic while adding proper error handling
This demonstrates good integration with the new fallible API design.
reqwest-enum/src/http.rs (4)
59-69: Excellent transition to fallible serializationThe changes to make
HTTPBody::fromandfrom_arrayfallible are well-implemented:
- Using
Vec<u8>writer withserde_json::to_writeris efficient- Proper error propagation with the
?operator- Consistent
Result<Self, serde_json::Error>return typeThis eliminates the previous
.unwrap()calls that could panic, providing better error handling.
74-79: Enhanced authentication flexibilityThe
AuthMethodupdates provide excellent improvements:
- Owned
Stringtypes forBasicandBearervariants offer greater flexibility- The new
Customvariant with boxed closure enables arbitrary authentication logic- Optional password in
Basicauth is a practical additionThe closure approach for
Customauth is powerful and allows for complex authentication scenarios.
81-89: Useful helper function for common use caseThe
header_api_keyhelper function provides a convenient way to create custom header-based authentication. The implementation correctly:
- Uses
moveclosure to capture the owned strings- Clones the values in the closure for repeated use
- Returns the appropriate
AuthMethod::CustomvariantThis addresses a common authentication pattern while demonstrating the flexibility of the
Customvariant.
91-103: Thoughtful Debug implementation for complex enumThe manual
Debugimplementation properly handles all variants:
BasicandBearervariants show their actual valuesCustomvariant displays"<function>"placeholder, which is appropriate since closures can't be meaningfully debuggedThis provides useful debugging information while handling the non-debuggable closure case gracefully.
…builder type for middleware support
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Actionable comments posted: 1
🔭 Outside diff range comments (1)
reqwest-enum/src/provider.rs (1)
164-182:⚠️ Potential issueFix error handling inconsistency in batch chunking.
The error handling pattern is inconsistent and potentially problematic. Line 180-181 has redundant Result wrapping that could cause compilation issues.
Apply this diff to fix the error handling:
- let http_body = HTTPBody::from_array(&requests).map_err(|e| JsonRpcError { code: -32700, message: format!("Failed to serialize batch chunk: {}", e) })?; - request = Ok(request?.body(http_body.inner)); - rpc_requests.push(request?); + let http_body = HTTPBody::from_array(&requests).map_err(|e| JsonRpcError { code: -32700, message: format!("Failed to serialize batch chunk: {}", e) })?; + let request_builder = request?.body(http_body.inner); + rpc_requests.push(request_builder);
📜 Review details
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⛔ Files ignored due to path filters (1)
Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (6)
Cargo.toml(2 hunks)examples/ethereum-rpc/src/ethereum_rpc.rs(3 hunks)reqwest-enum/Cargo.toml(1 hunks)reqwest-enum/src/http.rs(2 hunks)reqwest-enum/src/provider.rs(11 hunks)reqwest-enum/src/target.rs(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (4)
- Cargo.toml
- reqwest-enum/Cargo.toml
- reqwest-enum/src/target.rs
- examples/ethereum-rpc/src/ethereum_rpc.rs
⏰ Context from checks skipped due to timeout of 90000ms (1)
- GitHub Check: test
🔇 Additional comments (12)
reqwest-enum/src/http.rs (4)
60-64: Excellent improvement making serialization fallible.The change from panicking to returning
Result<Self, serde_json::Error>is a significant improvement that allows callers to handle serialization errors gracefully rather than crashing the application.
66-70: Consistent error handling for array serialization.Good consistency with the
frommethod by making array serialization also fallible.
104-110: API key helper provides good convenience and security.The
header_api_keyhelper function is well-designed, providing a safe and convenient way to create custom authentication for API keys. The use ofclone()ensures the closure can be called multiple times safely.
113-125: Excellent Debug implementation handling closures appropriately.The manual
Debugimplementation correctly handles the function pointer by showing a placeholder, which is the appropriate approach since closures cannot be meaningfully debugged. This maintains debuggability while protecting against potential information disclosure.reqwest-enum/src/provider.rs (8)
17-23: Good conditional compilation for middleware support.The type aliases and conditional imports provide clean separation between middleware and non-middleware builds. This approach maintains API compatibility while adding optional functionality.
59-70: Excellent conditional client field design.The conditional compilation for the client field properly handles the different client types based on feature flags. This ensures the right client type is used with appropriate middleware support.
88-91: Proper error handling in request execution.The request method correctly builds the request with error propagation and executes it using the configured client. This addresses the previous concern about using temporary clients.
274-310: Excellent comprehensive request builder implementation.The
request_buildermethod now properly addresses the previous review concerns by:
- Using
self.clientinstead of creating temporary clients- Returning
Resultfor proper error handling- Systematically applying all request configuration (query, headers, auth, body, timeout)
- Supporting the new
AuthMethod::CustomvariantThis is a significant improvement over the previous implementation.
183-191: Good conditional error handling for middleware.The conditional compilation for different error types based on middleware feature is well-implemented, ensuring proper error handling in both scenarios.
457-466: Test improvements with async and proper error handling.The conversion to async tests using
tokio::testand proper error handling withexpectis a good improvement that aligns with the crate's async nature.
468-482: Good test coverage for custom authentication.The new test for header API key authentication provides good coverage of the new
AuthMethod::Customfunctionality, verifying that custom headers are properly applied.
127-149:Details
✅ Verification successful
Verify batch request construction logic.
The batch processing has been improved but needs verification of the request builder usage pattern.
Verify that using a single representative target for the entire batch request is correct:
🏁 Script executed:
#!/bin/bash # Search for batch request implementations to understand the intended pattern rg -A 15 "representative_target" --type rustLength of output: 1579
🏁 Script executed:
#!/bin/bash # Locate and display the definition of `request_builder` in the provider module rg -A 10 "fn request_builder" -n reqwest-enum/src/provider.rsLength of output: 586
Review Batch Request Builder Usage
The batch implementation uses the first target’s HTTP method, URL, query parameters, and headers to construct the
reqwest::RequestBuilder. JSON-RPC batch calls must hit the same HTTP endpoint with identical configurations, so reusing one “representative” target is correct—provided that all targets share the same base URL, HTTP method, query params, and headers.• Confirm that
T::query()andT::headers()return the same values across all batch targets.
• If certain targets require unique query parameters or headers, you’ll need to merge or override them per request instead of using justtargets[0].No further code changes required here if your RPC targets are homogeneous in URL, method, query, and headers.
Summary by CodeRabbit
New Features
Bug Fixes
Refactor
Stringtypes andResultfor better flexibility and error handling.Documentation
Tests
Chores