Refactor sendAndReceive
#64
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""" WalkthroughThe changes introduce a new Kafka client implementation, update request encoding logic, and refactor related APIs. The new client manages connections, sending, and receiving Kafka protocol messages, with enhanced error handling and logging. Request encoding is simplified and made self-contained. Utility functions for hexdump formatting and API key naming are added, and interface definitions are updated to support the new client. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Stage as stage_dtp2.go
participant Client as kafka_client.Client
participant Broker as Kafka Broker
User->>Stage: Initiate request
Stage->>Client: NewClient("localhost:9092")
Stage->>Client: ConnectWithRetries()
Client->>Broker: Establish TCP connection
Stage->>Client: SendAndReceive(request, logger)
Client->>Broker: Send encoded request bytes
Broker-->>Client: Return response bytes
Client-->>Stage: Return Response struct
Stage->>Client: Close()
Client-->>Stage: Connection closed
Estimated code review effort3 (~45 minutes) Poem
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| @@ -3,19 +3,12 @@ package kafkaapi | |||
| import ( | |||
| "github.com/codecrafters-io/kafka-tester/protocol" | |||
| "github.com/codecrafters-io/kafka-tester/protocol/decoder" | |||
| "github.com/codecrafters-io/kafka-tester/protocol/encoder" | |||
| "github.com/codecrafters-io/kafka-tester/protocol/errors" | |||
| "github.com/codecrafters-io/tester-utils/logger" | |||
| ) | |||
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| func EncodeDescribeTopicPartitionsRequest(request *DescribeTopicPartitionsRequest) []byte { | |||
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Actionable comments posted: 6
🧹 Nitpick comments (3)
protocol/utils/utils.go (1)
50-65: Consider more graceful error handling for unknown API keys.While the function correctly maps known API keys to names, using
panicfor unknown keys might be too harsh. Consider returning an error or a default string like "Unknown API Key (X)" to make the code more robust.-func APIKeyToName(apiKey int16) string { +func APIKeyToName(apiKey int16) string { switch apiKey { case 0: return "Produce" case 1: return "Fetch" case 18: return "ApiVersions" case 19: return "CreateTopics" case 75: return "DescribeTopicPartitions" default: - panic(fmt.Sprintf("CodeCrafters Internal Error: Unknown API key: %v", apiKey)) + return fmt.Sprintf("Unknown API Key (%d)", apiKey) } }However, if this is specifically for a testing framework where unknown API keys indicate programming errors, the current panic approach may be acceptable.
protocol/builder/interface.go (1)
5-8: Consider Go naming convention for interfaces.The interface design is solid and provides a clean abstraction for request handling. However, Go convention typically avoids the 'I' suffix for interfaces. Consider renaming to just
RequestorRequestEncoder.-type RequestI interface { +type Request interface { Encode() []byte GetHeader() kafkaapi.RequestHeader }protocol/kafka_client/client.go (1)
197-221: Improve error handling structure.The empty else block is unnecessary. Consider restructuring the error handling for better readability.
if err != nil && err != io.EOF { if netErr, ok := err.(net.Error); ok && netErr.Timeout() { - } else { + // Timeout is expected, return what we have + return buf.Bytes(), nil + } - return nil, fmt.Errorf("error reading from connection: %v", err) - } + return nil, fmt.Errorf("error reading from connection: %v", err) }
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📒 Files selected for processing (8)
internal/stage_dtp2.go(3 hunks)internal/utils.go(1 hunks)protocol/api/describe_topic_partitions.go(1 hunks)protocol/api/describe_topic_partitions_request.go(1 hunks)protocol/api/header.go(1 hunks)protocol/builder/interface.go(1 hunks)protocol/kafka_client/client.go(1 hunks)protocol/utils/utils.go(1 hunks)
🧬 Code Graph Analysis (5)
protocol/builder/interface.go (1)
protocol/api/header.go (1)
RequestHeader(12-21)
protocol/utils/utils.go (1)
internal/utils.go (1)
GetFormattedHexdump(25-65)
protocol/api/describe_topic_partitions_request.go (2)
protocol/api/header.go (1)
RequestHeader(12-21)protocol/encoder/encoder.go (1)
Encoder(13-16)
internal/stage_dtp2.go (1)
protocol/kafka_client/client.go (2)
NewClient(39-41)Client(31-35)
protocol/kafka_client/client.go (3)
internal/kafka_executable/kafka_executable.go (1)
KafkaExecutable(14-18)protocol/builder/interface.go (1)
RequestI(5-8)protocol/utils/utils.go (1)
APIKeyToName(50-65)
🧰 Additional context used
🧬 Code Graph Analysis (5)
protocol/builder/interface.go (1)
protocol/api/header.go (1)
RequestHeader(12-21)
protocol/utils/utils.go (1)
internal/utils.go (1)
GetFormattedHexdump(25-65)
protocol/api/describe_topic_partitions_request.go (2)
protocol/api/header.go (1)
RequestHeader(12-21)protocol/encoder/encoder.go (1)
Encoder(13-16)
internal/stage_dtp2.go (1)
protocol/kafka_client/client.go (2)
NewClient(39-41)Client(31-35)
protocol/kafka_client/client.go (3)
internal/kafka_executable/kafka_executable.go (1)
KafkaExecutable(14-18)protocol/builder/interface.go (1)
RequestI(5-8)protocol/utils/utils.go (1)
APIKeyToName(50-65)
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🔇 Additional comments (7)
protocol/utils/utils.go (1)
8-48: LGTM! Well-implemented hex dump formatter.The function correctly formats byte data into a readable hex dump with proper alignment, ASCII representation, and padding. The use of
strings.Builderfor efficient string concatenation is a good practice.internal/utils.go (1)
23-24: Good practice to document the deprecation and migration path.The TODO comment clearly indicates the planned removal and replacement, which will help with the refactoring process.
protocol/api/describe_topic_partitions.go (1)
10-12: Good simplification that aligns with the interface-driven refactoring.The change to delegate encoding to the request's own
Encode()method makes the code cleaner and more self-contained, supporting the newRequestIinterface pattern.internal/stage_dtp2.go (3)
9-9: Import statement correctly added for the new Kafka client.The import aligns with the PR's objective to replace the Broker component with the new Client implementation.
28-34: Connection logic successfully migrated to the new Kafka client.The changes improve connection handling with built-in retry logic and proper resource cleanup. The integration with the Kafka executable for monitoring is a good enhancement.
48-48: Request sending properly updated to use the new client interface.The change from manual encoding to structured request handling improves code maintainability and aligns with the new architecture.
protocol/kafka_client/client.go (1)
111-136: Well-implemented request/response orchestration.The method provides excellent logging and clean separation of concerns between sending and receiving operations.
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There are a bunch of things mixed in here. There's renaming broker -> client, there's changing the interface of SendAndReceive, and there's moving GetFormattedHexDump to utils, there's a bunch of interface stuff.
Split out, and try to avoid in-progress comments for things that can clearly be done in one PR, like migrating usages of GetFormattedHexDump
Summary by CodeRabbit
New Features
Refactor
Documentation