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Describe basic request ratelimit system
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protocol-spec/basic-request-ratelimit.md
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protocol-spec/basic-request-ratelimit.md
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# Basic request ratelimit system
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## Introduction
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This extension is intended to limit the number of requests from clients per unit of time. It is based on Protocol Errors extension.
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## Message type identifiers
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None.
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## Use cases
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- Client:
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```json
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{
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"id": "abcd",
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"type": "profile:register",
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"to": "cadmium.org",
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"payload": {
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"username": "spam_spam_spam",
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"thirdPIDs": [],
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"password": "spam"
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}
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}
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```
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- Server:
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```json
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{
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"id": "abcd",
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"type": "profile:register",
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"from": "cadmium.org",
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"ok": false,
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"payload": {
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"errCode": "ratelimit_exceed",
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"errText": "Request ratelimit exceed! Please, try again later!",
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"errPayload": {
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"retryAfter": 2
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}
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}
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}
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```
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## Error Identifiers
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### Global error identifiers
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- `ratelimit_exceed`
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## Business Rules
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- Server MUST count number of requests per unit of time and drop new requests after specified number of made requests with Protocol Error message.
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- Number of requests and used unit of time SHOULD be configurable on server
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## JSON Schema
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### Error payload
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```typescript
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interface RatelimitExceedErrorPayload {
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/**
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* How long after the client can retry the request (in seconds)
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*/
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retryAfter: number
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}
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```
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