Add solution for Challenge 30 by imankhodadi#1080
Add solution for Challenge 30 by imankhodadi#1080imankhodadi wants to merge 1 commit intoRezaSi:mainfrom
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WalkthroughIntroduces a new Go context management module with a ContextManager interface providing comprehensive context manipulation capabilities, including cancellation, timeout handling, value attachment, task execution with cancellation awareness, concurrent processing, operation chaining, rate-limited execution, and cleanup support. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant CM as ContextManager
participant Task
participant Cancel as Cancellation Channel
rect rgb(220, 240, 255)
Note over Client,Cancel: Task Execution with Cancellation
Client->>CM: ExecuteWithContext(ctx, task)
activate CM
rect rgb(240, 248, 255)
Note over CM,Task: Check context before execution
CM->>Cancel: Select ctx.Done()
end
alt Context not cancelled
CM->>Task: Execute task()
activate Task
Task-->>CM: Return result/error
deactivate Task
CM-->>Client: Return result
else Context cancelled
CM-->>Cancel: ctx.Done() triggered
Cancel-->>Client: Return context.Canceled
end
deactivate CM
end
rect rgb(255, 240, 220)
Note over Client,Cancel: Timeout Execution
Client->>CM: ExecuteWithContextTimeout(ctx, task, timeout)
activate CM
CM->>CM: Create timeout context
CM->>CM: ExecuteWithContext(timeoutCtx, task)
CM-->>Client: Return (result or timeout error)
deactivate CM
end
sequenceDiagram
participant Client
participant CM as ContextManager
participant Pool as Worker Pool
participant Worker1 as Worker 1
participant Worker2 as Worker 2
rect rgb(220, 255, 220)
Note over Client,Worker2: Concurrent Item Processing
Client->>CM: ProcessItemsConcurrently(ctx, items, maxWorkers=2)
activate CM
CM->>Pool: Create worker pool (2 workers)
CM->>CM: Distribute items to workers
par Worker Execution
activate Worker1
Pool->>Worker1: Process item[0]
Worker1->>Worker1: Process & return result
Worker1-->>Pool: Result
deactivate Worker1
and
activate Worker2
Pool->>Worker2: Process item[1]
Worker2->>Worker2: Process & return result
Worker2-->>Pool: Result
deactivate Worker2
and
activate Worker1
Pool->>Worker1: Process item[2]
Worker1-->>Pool: Result
deactivate Worker1
end
alt All items processed successfully
Pool-->>CM: Aggregated results
CM-->>Client: Return []string, nil
else Error or Context Cancelled
alt ctx.Done() triggered
CM-->>Client: Return error (context cancelled)
else Worker error
CM-->>Client: Return error (propagated)
end
end
deactivate CM
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Possibly related PRs
Pre-merge checks❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 1
🤖 Fix all issues with AI Agents
In @challenge-30/submissions/imankhodadi/solution-template.go:
- Around line 252-270: The code currently returns results[:processedCount] on
cancellation which slices by position not by which indices were filled; instead
build and return a slice of only successfully processed values in index order:
after the receive loop (before returning on ctx.Err()) iterate the results
slice, collect indices with non-empty values into an int slice, sort it (add
"sort" to imports), then append results[idx] into a new []string and return that
slice with ctx.Err(); also run gofmt to fix inconsistent spacing.
📜 Review details
Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (1)
challenge-30/submissions/imankhodadi/solution-template.go
🔇 Additional comments (7)
challenge-30/submissions/imankhodadi/solution-template.go (7)
33-43: LGTM!These wrapper methods correctly delegate to the standard library context functions.
45-61: LGTM!The
GetValuecomment correctly documents the nil-value ambiguity. TheGetStringValueimplementation handles type assertion safely.
63-79: LGTM!The documentation clearly states the goroutine behavior on cancellation. The buffered channel prevents the goroutine from blocking on send when the context is cancelled.
88-126: LGTM!Both
WaitForCompletionandWaitWithProgresscorrectly use timers/tickers with proper cleanup viadefer. The minimum interval fallback inWaitWithProgressprevents issues with very small durations.
167-190: LGTM!Good use of pre-allocated slice capacity. The cancellation check pattern is correct, and partial results are properly returned on context cancellation.
290-325: LGTM!Both
ChainOperationsandRateLimitedExecutioncorrectly handle context cancellation. The rate limiter correctly skips the initial wait for the first task.
326-342: LGTM!Good demonstration of the API with proper cleanup using
defer cancel().
| results := make([]string, len(items)) | ||
| processedCount := 0 | ||
| for result := range resultChan { | ||
| if result.err != nil { | ||
| cancel() // Signal other workers to stop | ||
| // Drain remaining results | ||
| for range resultChan { | ||
| } | ||
| return nil, result.err | ||
| } | ||
| results[result.index] = result.value | ||
| processedCount++ | ||
| } | ||
| // Check if context was cancelled | ||
| if ctx.Err() != nil { | ||
| // Return only successfully processed results | ||
| return results[:processedCount], ctx.Err() | ||
| } | ||
| return results, nil |
There was a problem hiding this comment.
Bug: Incorrect result slice on cancellation returns unprocessed items.
When the context is cancelled, results[:processedCount] is returned, but results are indexed by their original position (not by order of completion). This can return empty strings for items that were never processed.
Example: If items at indices 0, 2, 4 complete before cancellation with processedCount=3, then results[:3] returns {processed_item0, "", processed_item2} — the empty string at index 1 was never processed.
🔎 Suggested fix: Return only successfully processed items
// Collect results
- results := make([]string, len(items))
- processedCount := 0
+ results := make([]string, len(items))
+ processedIndices := make([]int, 0, len(items))
for result := range resultChan {
if result.err != nil {
cancel() // Signal other workers to stop
// Drain remaining results
for range resultChan {
}
return nil, result.err
}
results[result.index] = result.value
- processedCount++
+ processedIndices = append(processedIndices, result.index)
}
// Check if context was cancelled
if ctx.Err() != nil {
- // Return only successfully processed results
- return results[:processedCount], ctx.Err()
+ // Return only successfully processed results in order
+ sort.Ints(processedIndices)
+ successfulResults := make([]string, len(processedIndices))
+ for i, idx := range processedIndices {
+ successfulResults[i] = results[idx]
+ }
+ return successfulResults, ctx.Err()
}
return results, nilThis requires adding "sort" to imports.
Additionally, there are inconsistent leading spaces on lines 252, 254, 255, 262 — consider running gofmt.
Committable suggestion skipped: line range outside the PR's diff.
🤖 Prompt for AI Agents
In @challenge-30/submissions/imankhodadi/solution-template.go around lines 252 -
270, The code currently returns results[:processedCount] on cancellation which
slices by position not by which indices were filled; instead build and return a
slice of only successfully processed values in index order: after the receive
loop (before returning on ctx.Err()) iterate the results slice, collect indices
with non-empty values into an int slice, sort it (add "sort" to imports), then
append results[idx] into a new []string and return that slice with ctx.Err();
also run gofmt to fix inconsistent spacing.
2 participants
Challenge 30 Solution
Submitted by: @imankhodadi
Challenge: Challenge 30
Description
This PR contains my solution for Challenge 30.
Changes
challenge-30/submissions/imankhodadi/solution-template.goTesting
Thank you for reviewing my submission! 🚀