AICentral 0.21.1

AI Central

AI Central gives you control over your AI services.

• Minimal overhead - written on Asp.Net Core, on dotnet 8. One of the fastest web-servers in the business.
• Enable advanced Azure APIm scenarios such as passing a Subscription Key, and a JWT from libraries like PromptFlow that don't support that out-of-the-box.
• PII Stripping logging to Cosmos DB
  • Powered by graemefoster/aicentral.logging.piistripping
• Lightweight out-the-box token metrics surfaced through Open Telemetry
  • Does not buffer and block streaming
  • Use for PTU Chargeback scenarios
  • Gain quick insights into who's using what, how much, and how often
  • Standard Open Telemetry format to surface Dashboards in you monitoring solution of choice
• Prompt and usage logging to Azure Monitor
  • Works for streaming endpoints as-well as non-streaming
• Intelligent Routing
  • Endpoint Selector that favours endpoints reporting higher available capacity
  • Random endpoint selector
  • Prioritised endpoint selector with fallback
  • Lowest Latency endpoint selector
• Can proxy asynchronous requests such as Azure OpenAI DALLE2 Image Generation across fleets of servers
• Custom consumer OAuth2 authorisation
• Can mint JWT time-bound and consumer-bound JWT tokens to make it easy to run events like Hackathons without blowing your budget
• Circuit breakers and backoff-retry over downstream AI services
• Local token rate limiting
  • By consumer / by endpoint
  • By number of tokens (including streaming by estimated token count)
• Local request rate limiting
  • By consumer / by endpoint
• Bulkhead support for buffering requests to backend
• Distributed token rate limiting (using Redis)
  • Powered by an extension graemefoster/aicentral.ratelimiting.distributedredis
• AI Search Vectorization endpoint
  • Powered by an extension graemefoster/aicentral.azureaisearchvectorizer
• Support for Azure Inference endpoint

Configuration

See docs on Github for more details.

Minimal

This sample produces a AI-Central proxy that

• Listens on a hostname of your choosing
• Proxies directly through to a back-end Open AI server
• Can be accessed using standard SDKs
• Outputs open-telemetry metrics to capture usage information

{
  "AICentral": {
    "Endpoints": [
      {
        "Type": "AzureOpenAIEndpoint",
        "Name": "openai-1",
        "Properties": {
          "LanguageEndpoint": "https://<my-ai>.openai.azure.com",
          "AuthenticationType": "ApiKey",
          "ApiKey": "<key>"
        }
      }
    ],
    "EndpointSelectors": [
      {
        "Type": "SingleEndpoint",
        "Name": "default",
        "Properties": {
          "Endpoint": "openai-1"
        }
      }
    ],
    "AuthProviders": [
      {
        "Type": "ApiKey",
        "Name": "apikey",
        "Properties": {
          "Clients": [
            {
              "ClientName": "Consumer-1",
              "Key1": "<random-key>",
              "Key2": "<random-key>"
            }
          ]
        }
      }
    ],
    "Pipelines": [
      {
        "Name": "OpenAIPipeline",
        "Host": "mypipeline.mydomain.com",
        "EndpointSelector": "default",
        "AuthProvider": "apikey",
        "OpenTelemetryConfig": {
          "AddClientNameTag": true,
          "Transmit": true
        }
      }
    ]
  }
}

Full example

This pipeline will:

• Present an Azure Open AI, and an Open AI downstream as a single upstream endpoint
  • maps the incoming deployment Name "GPT35Turbo0613" to the downstream Azure Open AI deployment "MyGptModel"
  • maps incoming Azure Open AI deployments to Open AI models
• Present it as an Azure Open AI style endpoint
• Protect the front-end by requiring an AAD token issued for your own AAD application
• Put a local Asp.Net core rate-limiting policy over the endpoint
• Emit Open Telemetry to be picked up by your OTel collector
• Add rich logging to Azure monitor
  • Logs quota, client caller information (IP and identity name), and in this case the Prompt but not the response.
• Publish the client-name as a tag in Open Telemetry

{
  "AICentral": {
    "Endpoints": [
      {
        "Type": "AzureOpenAIEndpoint",
        "Name": "openai-priority",
        "Properties": {
          "LanguageEndpoint": "https://<my-ai>.openai.azure.com",
          "AuthenticationType": "Entra|EntraPassThrough|ApiKey",
          "MaxConcurrency": 10,
          "ModelMappings": {
            "Gpt35Turbo0613": "MyGptModel"
          }
        }
      },
      {
        "Type": "OpenAIEndpoint",
        "Name": "openai-fallback",
        "Properties": {
          "LanguageEndpoint": "https://api.openai.com",
          "ModelMappings": {
            "Gpt35Turbo0613": "gpt-3.5-turbo",
            "Ada002Embedding": "text-embedding-ada-002"
          },
          "ApiKey": "<my-api-key>",
          "Organization": "<optional-organisation>"
        }
      }
    ],
    "AuthProviders": [
      {
        "Type": "Entra",
        "Name": "simple-aad",
        "Properties": {
          "Entra": {
            "ClientId": "<my-client-id>",
            "TenantId": "<my-tenant-id>",
            "Instance": "https://login.microsoftonline.com/",
            "Audience": "<custom-audience>"
          }
        }
      }
    ],
    "EndpointSelectors": [
      {
        "Type": "Prioritised",
        "Name": "my-endpoint-selector",
        "Properties": {
          "PriorityEndpoints": ["openai-1"],
          "FallbackEndpoints": ["openai-fallback"]
        }
      }
    ],
    "GenericSteps": [
      {
        "Type": "AspNetCoreFixedWindowRateLimiting",
        "Name": "token-rate-limiter",
        "Properties": {
          "LimitType": "PerConsumer|PerAICentralEndpoint",
          "MetricType": "Tokens",
          "Options": {
            "Window": "00:01:00",
            "PermitLimit": 1000
          }
        }
      },
      {
        "Type": "AspNetCoreFixedWindowRateLimiting",
        "Name": "window-rate-limiter",
        "Properties": {
          "LimitType": "PerConsumer|PerAICentralEndpoint",
          "MetricType": "Requests",
          "Options": {
            "Window": "00:00:10",
            "PermitLimit": 100
          }
        }
      },
      {
        "Type": "AzureMonitorLogger",
        "Name": "azure-monitor-logger",
        "Properties": {
          "WorkspaceId": "<workspace-id>",
          "Key": "<key>",
          "LogPrompt": true,
          "LogResponse": false,
          "LogClient": true
        }
      },
      {
        "Type": "BulkHead",
        "Name": "bulk-head",
        "Properties": {
          "MaxConcurrency": 20
        }
      }
    ],
    "Pipelines": [
      {
        "Name": "MyPipeline",
        "Host": "prioritypipeline.mydomain.com",
        "EndpointSelector": "my-endpoint-selector",
        "AuthProvider": "simple-aad",
        "Steps": [
          "window-rate-limiter",
          "bulk-head",
          "azure-monitor-logger"
        ],
        "OpenTelemetryConfig": {
          "AddClientNameTag": true,
          "Transmit": true
        }
      }
    ]
  }
}