feat: 为渠道添加上下文限制功能 #1704
feat: 为渠道添加上下文限制功能 #1704
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WalkthroughAdds a per-channel token limit: new context key and Channel model field/method, middleware propagation into context, RelayInfo field, relay text validation that can return a new error code, and a web UI input to configure the limit. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
participant UI as Web UI (Edit Channel)
participant API as API Server
participant MW as Middleware (Distributor)
participant RC as RelayCommon (GenRelayInfo)
participant RT as RelayText (TextHelper)
UI->>API: Save Channel with token_limit
Note right of API: token_limit persisted on Channel
API->>MW: Incoming request (selected channel)
MW->>MW: ctx[ContextKeyChannelTokenLimit] = channel.GetTokenLimit()
MW->>RC: GenRelayInfo(ctx)
RC->>RC: RelayInfo.ChannelTokenLimit = ctx value
RC-->>RT: RelayInfo
RT->>RT: Count promptTokens
RT->>RT: checkPromptTokensInBotChannel(promptTokens, RelayInfo)
alt tokens > ChannelTokenLimit
RT-->>API: Error: prompt_tokens_too_large
API-->>UI: 4xx with error code
else OK
RT->>RT: continue pricing/relay
RT-->>API: normal response
API-->>UI: success
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
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✅ Files skipped from review due to trivial changes (1)
🚧 Files skipped from review as they are similar to previous changes (6)
✨ Finishing Touches
🧪 Generate unit tests
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Actionable comments posted: 1
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⚠️ Outside diff range comments (1)
relay/relay-text.go (1)
116-128: Bug: relayInfo.PromptTokens isn’t set when computed here (breaks fallback usage/logging).If prompt_tokens isn’t already in the Gin context, you compute it but never assign to relayInfo.PromptTokens. Later, postConsumeQuota uses relayInfo.PromptTokens when usage is nil, resulting in 0.
} else { promptTokens, err = getPromptTokens(textRequest, relayInfo) // count messages token error 计算promptTokens错误 if err != nil { return types.NewError(err, types.ErrorCodeCountTokenFailed) } c.Set("prompt_tokens", promptTokens) + relayInfo.PromptTokens = promptTokens }
🧹 Nitpick comments (8)
constant/context_key.go (1)
34-34: Document the semantics (0 = unlimited) and unit for the new key.Please add a brief comment clarifying that this value is a per-channel prompt token cap, measured in tokens, and that 0 disables the cap. This avoids ambiguity across middleware/relay layers.
Apply this diff:
- ContextKeyChannelTokenLimit ContextKey = "channel_token_limit" + // per-channel prompt token limit (prompt/context tokens only); 0 means unlimited + ContextKeyChannelTokenLimit ContextKey = "channel_token_limit"Can you confirm that the enforcement code treats values <= 0 as “unlimited”?
types/error.go (1)
41-41: Set client error status for prompt-token limit
In relay/relay-text.go at thecheckPromptTokensInBotChannelerror path (line 132),types.NewError(err, types.ErrorCodePromptTokensTooLarge)defaults to HTTP 500. Replace it withtypes.NewErrorWithStatusCode(err, types.ErrorCodePromptTokensTooLarge, http.StatusBadRequest)(or 422) so token-limit violations return a 4xx status.web/src/pages/Channel/EditChannel.js (1)
1375-1384: Clarify UX: show “0 = unlimited” and what is being limited.Add brief help text and a clearer placeholder to reduce confusion between prompt vs output tokens.
Apply this diff:
<Form.InputNumber field='token_limit' - label={t('最大上下文')} - placeholder={t('最大上下文')} + label={t('最大上下文')} + placeholder={t('最大上下文，0 表示不限制')} min={0} onNumberChange={(value) => handleInputChange('token_limit', value)} style={{ width: '100%' }} + extraText={t('仅限制提示词 tokens（输入上下文），不限制输出 tokens')} />relay/common/relay_info.go (2)
65-65: Document the semantics of ChannelTokenLimit (0 = unlimited) and avoid negative surprises.Add a short field comment to make the contract explicit. Consider treating negatives as 0.
- ChannelTokenLimit int + ChannelTokenLimit int // 0 means unlimited; negative values are treated as 0
219-221: Clamp channelTokenLimit to zero if negative.Add a guard after reading the value to prevent negative limits from blocking requests:
- channelTokenLimit := common.GetContextKeyInt(c, constant.ContextKeyChannelTokenLimit) + channelTokenLimit := common.GetContextKeyInt(c, constant.ContextKeyChannelTokenLimit) + if channelTokenLimit < 0 { + channelTokenLimit = 0 + }relay/relay-text.go (3)
130-134: Return 400 Bad Request on limit violation (don’t use 500).Exceeding a per-channel prompt limit is a client error. Use NewErrorWithStatusCode to return 400.
- err = checkPromptTokensInBotChannel(promptTokens, relayInfo) - if err != nil { - return types.NewError(err, types.ErrorCodePromptTokensTooLarge) - } + err = checkPromptTokensInBotChannel(promptTokens, relayInfo) + if err != nil { + return types.NewErrorWithStatusCode(err, types.ErrorCodePromptTokensTooLarge, http.StatusBadRequest) + }
268-274: Name/message polish and defensive semantics.
- Function name can be clearer; current name mixes “Bot” jargon. Suggest “checkPromptTokensAgainstChannelLimit”.
- Grammar: “tokens are greater…”
- Optional: treat negative limits as unlimited (defensive).
-func checkPromptTokensInBotChannel(promptTokens int, info *relaycommon.RelayInfo) error { - if info.ChannelTokenLimit > 0 && promptTokens > info.ChannelTokenLimit { - return fmt.Errorf("prompt tokens (%d) is greater than channel token limit (%d)", promptTokens, info.ChannelTokenLimit) - } - return nil -} +func checkPromptTokensAgainstChannelLimit(promptTokens int, info *relaycommon.RelayInfo) error { + limit := info.ChannelTokenLimit + if limit < 0 { + limit = 0 + } + if limit > 0 && promptTokens > limit { + return fmt.Errorf("prompt tokens (%d) are greater than channel token limit (%d)", promptTokens, limit) + } + return nil +}And update the call site:
-err = checkPromptTokensInBotChannel(promptTokens, relayInfo) +err = checkPromptTokensAgainstChannelLimit(promptTokens, relayInfo)
268-274: Optional: enforce “prompt + planned completion” against the limit.If “最大上下文” is intended as total context tokens, consider also checking promptTokens + max(textRequest.MaxTokens, textRequest.MaxCompletionTokens) against the limit. Would require passing the request into the check function; keep it off by default to avoid false rejections on generous limits.
Do you want me to draft this change gated by a config flag (e.g., enforce_total_context_limit: bool) so it can be rolled out safely?
Also applies to: 130-134
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📒 Files selected for processing (7)
constant/context_key.go(1 hunks)middleware/distributor.go(1 hunks)model/channel.go(2 hunks)relay/common/relay_info.go(3 hunks)relay/relay-text.go(3 hunks)types/error.go(1 hunks)web/src/pages/Channel/EditChannel.js(2 hunks)
🧰 Additional context used
🧠 Learnings (1)
📚 Learning: 2025-06-21T03:37:41.726Z
Learnt from: 9Ninety
PR: QuantumNous/new-api#1273
File: relay/channel/gemini/relay-gemini.go:97-116
Timestamp: 2025-06-21T03:37:41.726Z
Learning: In relay/channel/gemini/relay-gemini.go, the thinking budget calculation logic (including the MaxOutputTokens multiplication) was introduced in PR #1247. PR #1273 focused specifically on decoupling the thoughts summary feature from thinking budget settings and did not modify the existing thinking budget behavior.
Applied to files:
relay/relay-text.go
🧬 Code graph analysis (4)
middleware/distributor.go (2)
common/gin.go (1)
SetContextKey(49-51)constant/context_key.go (1)
ContextKeyChannelTokenLimit(34-34)
relay/common/relay_info.go (2)
common/gin.go (1)
GetContextKeyInt(61-63)constant/context_key.go (1)
ContextKeyChannelTokenLimit(34-34)
web/src/pages/Channel/EditChannel.js (1)
web/src/pages/Detail/index.js (1)
handleInputChange(624-630)
relay/relay-text.go (2)
types/error.go (2)
NewError(146-154)ErrorCodePromptTokensTooLarge(41-41)relay/common/relay_info.go (1)
RelayInfo(62-113)
🔇 Additional comments (5)
model/channel.go (1)
47-47: Pointer + default: verify migration and allow‐null semantics
- Confirm
&model.Channelis included in theDB.AutoMigrate(...)call (model/main.go) so thetoken_limitcolumn is created.- Ensure the column is NULL-able and that
GetTokenLimit()correctly treats nil as 0.- Server-side must still sanitize negative
token_limitvalues from raw API clients, despite the UI’smin=0.web/src/pages/Channel/EditChannel.js (1)
105-105: LGTM: sensible default.Defaulting
token_limitto 0 (unlimited) matches server semantics.middleware/distributor.go (1)
270-270: LGTM: propagates channel token limit via context.This surfaces the limit early for relay code to consume. With the accessor clamping negatives to 0, the context value will be safe to read.
Please confirm
relay/common/relay_info.GenRelayInforeads this viacommon.GetContextKeyIntand that enforcement checks use “> 0” before comparing.relay/common/relay_info.go (1)
240-241: LGTM — value is plumbed into RelayInfo.relay/relay-text.go (1)
504-504: LGTM — simpler string concatenation over fmt.Sprintf.Minor readability/micro-alloc improvement.
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