fix(ai-image): forward the client's idempotency_key to the upstream by feruzm · Pull Request #87 · ecency/vision-api

feruzm · 2026-08-25T12:27:31Z

Forward idempotency_key in AiGenerateImage, mirroring how AiTranscribe already carries it. The upstream validates the key format itself and uses it to replay a paid-but-undelivered generation on retry instead of creating (and charging) a new one.

Fixes #86

Summary by CodeRabbit

Bug Fixes
- Improved image generation requests by forwarding the optional idempotency key, helping prevent duplicate processing when requests are retried.

The web client sends idempotency_key so a retry after a delivery-pending response recovers the same paid generation instead of charging a second one. The handler forwarded only prompt/aspect_ratio/power, so the key never reached the upstream and every retry was billed as a new generation. Fixes #86

qodo-code-review · 2026-08-25T12:27:36Z

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qodo-free-for-open-source-projects · 2026-08-25T12:28:19Z

PR Summary by Qodo

Forward ai-image idempotency_key to upstream to prevent double billing

🐞 Bug fix 🕐 10-20 Minutes

AI Description

• Forward client-provided "idempotency_key" in the AI image generation request.
• Enable upstream replay of paid-but-undelivered generations on retries, avoiding re-charges.
• Document the idempotency behavior and leave key validation to the upstream.

Diagram

sequenceDiagram
  actor C as "Web Client"
  participant API as "Ecency API"
  participant H as "AiGenerateImage"
  participant U as "Upstream AI"

  C->>API: POST /private-api/ai-image-generate\n(prompt, aspect_ratio, power, idempotency_key, code)
  API->>H: ValidateCode(code) + build payload
  H->>U: POST ai-image-generate\n(us, prompt, aspect_ratio, power, idempotency_key)
  U-->>H: Response (replay prior result on retry)
  H-->>C: Forward upstream response

High-Level Assessment

The following are alternative approaches to this PR:

1. Server-side idempotency cache (API-owned)

➕ Does not rely on clients to generate/store an idempotency key correctly
➕ Can enforce consistent idempotency behavior across multiple upstreams
➖ Requires state/storage and eviction strategy
➖ Duplicates logic the upstream already implements; higher operational complexity

2. Validate idempotency_key format at the edge

➕ Fail fast with clearer 4xx responses before reaching upstream
➖ Risk of drifting from upstream validation rules
➖ Does not solve the core issue if the key is simply not forwarded

Recommendation: Forwarding idempotency_key (this PR) is the best option because the upstream already validates the format and uses it to replay paid-but-undelivered generations; adding local idempotency would introduce unnecessary state and complexity. Local validation could be considered later only if upstream error messages are insufficient for client UX.

Files changed (1) +3 / -1

Bug fix (1) +3 / -1

PrivateApi.Misc.csInclude idempotency_key in AiGenerateImage upstream payload +3/-1

Include idempotency_key in AiGenerateImage upstream payload

• AiGenerateImage now copies the client-provided idempotency_key into the JsonObject forwarded to the upstream ai-image-generate endpoint. An inline comment explains that this enables retries to replay the same paid generation and avoids duplicate charges, while upstream owns validation.

dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs

qodo-free-for-open-source-projects · 2026-08-25T12:29:35Z

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0) 🎨 UX issues (0) 🔗 Cross-repo conflicts (0) 📜 Skill insights (0)

1. ~~Blank idempotency key forwarded~~ ✗ Dismissed 🐞 Bug ≡ Correctness

Description

AiGenerateImage forwards idempotency_key whenever it is present in the JSON body, including ""
/ whitespace / non-string values, which can trigger upstream 400 validation errors and break clients
that send an optional-but-empty field. The repo already codifies the opposite behavior for
idempotency keys: omit when empty so the request still succeeds (just without dedup).

Code

dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[R561-564]

+        // idempotency_key lets a retry recover the same paid generation instead of
+        // charging a second one; the upstream validates its format itself.
+        MiscCopyIfPresent(data, body, "prompt", "aspect_ratio", "power", "idempotency_key");
       // AI image generation legitimately takes 10-60s+; keep it long.

Relevance

●●● Strong
Recent reviews accept defensive validation of malformed optional upstream inputs, especially in this
handler and JSON boundaries.
PR-#62
PR-#80

ⓘ Recommendations generated based on similar findings in past PRs

Evidence
The PR change adds idempotency_key to MiscCopyIfPresent, which copies any present value
(including empty strings/null) into the upstream payload. The repo already documents that upstream
rejects blank idempotency keys and therefore intentionally omits them in AiTranscribe;
AiGenerateImage should match that behavior to avoid new 400s when clients send an empty optional
field.
dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[55-64]
dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[548-566]
dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[679-697]
dotnet/EcencyApi.Tests/AiTranscribeContentTests.cs[57-68]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
`AiGenerateImage` uses `MiscCopyIfPresent(...)` to forward `idempotency_key` whenever the property exists in the request JSON. That helper preserves “present but empty/null” values, which means `idempotency_key: ""` (or whitespace) will be forwarded upstream and can fail upstream validation.
The codebase already treats empty idempotency keys specially for `AiTranscribe`: it omits empty/blank keys because upstream rejects blanks, while an absent key is allowed.
## Issue Context
- `MiscCopyIfPresent` copies any present node (including empty strings and null) into the upstream payload.
- For idempotency keys, a blank value should be treated like “not provided” to preserve backward compatibility and avoid turning optional empty fields into hard failures.
## Fix Focus Areas
- dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[548-566]
- dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[55-64]
- dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[679-697]
## Implementation sketch
1. Keep `MiscCopyIfPresent(data, body, "prompt", "aspect_ratio", "power")` for existing fields.
2. Handle `idempotency_key` explicitly:
 - Extract as a string with `body.Str("idempotency_key")`.
 - If `idempotencyKey != null && idempotencyKey.Trim().Length > 0`, set `data["idempotency_key"] = idempotencyKey`.
 - Otherwise omit it entirely.
3. (Optional) Add a small unit test if there’s an existing pattern for handler-level tests; otherwise this is straightforward enough to rely on the established `AiTranscribe` behavior as precedent.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

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coderabbitai · 2026-08-25T12:30:29Z

📝 Walkthrough

Walkthrough

AiGenerateImage now forwards the request’s optional idempotency_key with the existing image-generation parameters.

Changes

Image generation request forwarding

Layer / File(s)	Summary
Forward idempotency key `dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs`	`AiGenerateImage` includes `idempotency_key` in the upstream payload with `prompt`, `aspect_ratio`, and `power`.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: 🔵 Low · up to 457bf

Image requests containing an empty optional idempotency key may now receive a 400 response instead of succeeding. The change is otherwise localized, but the empty-value handling should be corrected or explicitly accepted before merge.

Poem

A rabbit checks the image trail
The key now rides each retry’s sail
Prompts and power travel too
The upstream gets the full queue
One small field keeps requests in tune

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the primary change: forwarding the client's idempotency_key for AI image generation.
Linked Issues check	✅ Passed	The change adds idempotency_key to AiGenerateImage forwarding, which directly satisfies issue `#86` and supports paid-generation recovery without duplicate charges, vendor calls, or rate-limit usage.
Out of Scope Changes check	✅ Passed	The only reported code change updates AiGenerateImage to forward idempotency_key. This change is directly related to issue `#86` and the stated objectives.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

Create stacked PR
Commit on current branch

🧪 Generate unit tests (beta)

Create PR with unit tests
Commit unit tests in branch fix/ai-image-idempotency-key

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Actionable comments posted: 1

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs`:
- Around line 561-563: Update the MiscCopyIfPresent call in the relevant
request-building flow to exclude idempotency_key when its value is an empty
string, matching the handling in AiTranscribe while continuing to forward
non-empty keys.

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Create a new PR with the fixes

ℹ️ Review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: 934c94e5-6c83-4dc5-bc1b-e6a0968a2dcf

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Reviewing files that changed from the base of the PR and between b08b5b4 and 457bf60.

📒 Files selected for processing (1)

dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs

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qodo-code-review · 2026-08-25T12:33:12Z

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📜 Skill insights (0)

1. ~~Blank idempotency key forwarded~~ ✗ Dismissed 🐞 Bug ≡ Correctness

Description

AiGenerateImage forwards idempotency_key whenever it is present in the JSON body, including ""
/ whitespace / non-string values, which can trigger upstream 400 validation errors and break clients
that send an optional-but-empty field. The repo already codifies the opposite behavior for
idempotency keys: omit when empty so the request still succeeds (just without dedup).

Code

dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[R561-564]

+        // idempotency_key lets a retry recover the same paid generation instead of
+        // charging a second one; the upstream validates its format itself.
+        MiscCopyIfPresent(data, body, "prompt", "aspect_ratio", "power", "idempotency_key");
        // AI image generation legitimately takes 10-60s+; keep it long.

Relevance

●●● Strong
Recent reviews accept defensive validation of malformed optional upstream inputs, especially in this
handler and JSON boundaries.
PR-#62
PR-#80

ⓘ Recommendations generated based on similar findings in past PRs

Evidence
The PR change adds idempotency_key to MiscCopyIfPresent, which copies any present value
(including empty strings/null) into the upstream payload. The repo already documents that upstream
rejects blank idempotency keys and therefore intentionally omits them in AiTranscribe;
AiGenerateImage should match that behavior to avoid new 400s when clients send an empty optional
field.
dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[55-64]
dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[548-566]
dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[679-697]
dotnet/EcencyApi.Tests/AiTranscribeContentTests.cs[57-68]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
`AiGenerateImage` uses `MiscCopyIfPresent(...)` to forward `idempotency_key` whenever the property exists in the request JSON. That helper preserves “present but empty/null” values, which means `idempotency_key: ""` (or whitespace) will be forwarded upstream and can fail upstream validation.

The codebase already treats empty idempotency keys specially for `AiTranscribe`: it omits empty/blank keys because upstream rejects blanks, while an absent key is allowed.

## Issue Context
- `MiscCopyIfPresent` copies any present node (including empty strings and null) into the upstream payload.
- For idempotency keys, a blank value should be treated like “not provided” to preserve backward compatibility and avoid turning optional empty fields into hard failures.

## Fix Focus Areas
- dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[548-566]
- dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[55-64]
- dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs[679-697]

## Implementation sketch
1. Keep `MiscCopyIfPresent(data, body, "prompt", "aspect_ratio", "power")` for existing fields.
2. Handle `idempotency_key` explicitly:
  - Extract as a string with `body.Str("idempotency_key")`.
  - If `idempotencyKey != null && idempotencyKey.Trim().Length > 0`, set `data["idempotency_key"] = idempotencyKey`.
  - Otherwise omit it entirely.
3. (Optional) Add a small unit test if there’s an existing pattern for handler-level tests; otherwise this is straightforward enough to rely on the established `AiTranscribe` behavior as precedent.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

Context sources

✅ Compliance rules (platform): 21 rules

Review mode: ⚖️ Balanced: This is a small, localized runtime change, but it affects paid AI generation retries and idempotency behavior, making a careful standard review warranted.

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coderabbitai Bot reviewed Aug 25, 2026

View reviewed changes

Comment thread dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs

qodo-code-review Bot reviewed Aug 25, 2026

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Comment thread dotnet/EcencyApi/Handlers/PrivateApi.Misc.cs

feruzm mentioned this pull request Aug 25, 2026

fix(ai-image): keep the idempotency key on 409 in_progress and auto-poll for the finished image ecency/vision-web#1686

Merged

feruzm merged commit 889ef91 into main Aug 25, 2026
4 checks passed

feruzm deleted the fix/ai-image-idempotency-key branch August 25, 2026 13:19

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fix(ai-image): forward the client's idempotency_key to the upstream - #87

fix(ai-image): forward the client's idempotency_key to the upstream#87
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