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Add AWS Bedrock Converse/ConverseStream provider support
This commit implements full support for AWS Bedrock's Converse and ConverseStream APIs in ECA. Key Features: - Standard chat completions via Converse API - Streaming responses via ConverseStream API - Full tool use support with proper formatting - Custom binary event stream parser (no AWS SDK required) - Bearer token authentication via external proxy - Model aliasing for convenience - Support for additional model parameters (e.g., top_k, topP) Implementation Details: - Uses hato.client for HTTP requests (consistent with other providers) - Custom binary stream parser following AWS Event Stream protocol - Proper CRC checksum handling for streaming responses - Comprehensive error handling and logging Testing: - 8 tests covering all major functionality (17 assertions) - Tool use workflows - Binary stream parsing - Response parsing - Payload building Configuration Example: ```clojure {:providers {:bedrock {:api "anthropic" :key "${env:BEDROCK_API_KEY}" :url "https://proxy.example.com/model/{modelId}/converse" :region "us-east-1" :models {:claude-3-sonnet {:modelName "anthropic.claude-3-sonnet-20240229-v1:0"}}}}} ``` Usage: ```clojure ;; Standard request (provider/request bedrock-config messages {:temperature 0.5 :top_k 200}) ;; With tools (provider/request bedrock-config messages {:tools [tool-spec] :temperature 0.7}) ;; Streaming (provider/request bedrock-stream-config messages {:temperature 0.7}) ``` Files Changed: - src/eca/llm_api.clj: Added require for aws-bedrock provider - src/eca/llm_providers/aws_bedrock.clj: New provider implementation - test/eca/llm_providers/aws_bedrock_test.clj: Comprehensive test suite - AWS_BEDROCK_EXAMPLE.md: Usage documentation This implementation follows the established patterns in the codebase and is ready for production use.
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‎AWS_BEDROCK_EXAMPLE.md‎

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# AWS Bedrock Provider for ECA
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This document explains how to configure and use the AWS Bedrock provider in ECA.
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## Configuration
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To use AWS Bedrock with ECA, you need to configure the provider in your ECA configuration file (`.eca/config.json`).
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### Basic Configuration
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```json
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{
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"providers": {
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"bedrock": {
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"api": "anthropic",
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"key": "${env:BEDROCK_API_KEY}",
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"url": "https://your-proxy.example.com/model/{modelId}/converse",
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"region": "us-east-1",
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"models": {
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"claude-3-sonnet": {
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"modelName": "anthropic.claude-3-sonnet-20240229-v1:0"
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},
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"claude-3-opus": {
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"modelName": "anthropic.claude-3-opus-20240229-v1:0"
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}
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}
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}
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}
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}
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```
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### Environment Variable Setup
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Set your AWS Bedrock API key as an environment variable:
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```bash
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export BEDROCK_API_KEY="your-api-key-here"
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```
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## Usage
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Once configured, you can use the AWS Bedrock provider like any other provider in ECA:
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### Basic Chat
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```clojure
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(provider/request bedrock-config messages {:temperature 0.7})
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```
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### With Tools
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```clojure
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(provider/request bedrock-config messages
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{:tools [tool-spec]
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:temperature 0.7
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:top_k 200})
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```
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### Streaming Responses
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```clojure
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(provider/request bedrock-stream-config messages {:temperature 0.7})
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```
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## Supported Parameters
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The AWS Bedrock provider supports the following parameters:
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- `temperature`: Controls randomness (0.0 to 1.0)
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- `top_k`: Number of top tokens to consider (default: 200)
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- `max_tokens`: Maximum tokens to generate (default: 1024)
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- `stopSequences`: Sequences that stop generation
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- `tools`: Tool specifications for tool use
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## Authentication
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This implementation uses Bearer token authentication via an external proxy that handles AWS SigV4 signing. The proxy should:
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1. Accept a Bearer token in the Authorization header
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2. Handle AWS SigV4 signing for the actual AWS Bedrock API calls
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3. Forward requests to the AWS Bedrock Converse API
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## Model Aliasing
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You can use model aliases for convenience:
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```json
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"models": {
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"claude-3-sonnet": {
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"modelName": "anthropic.claude-3-sonnet-20240229-v1:0"
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}
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}
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```
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Then use `bedrock/claude-3-sonnet` as the model identifier.
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## Troubleshooting
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### Common Issues
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1. **Authentication Errors**: Make sure your proxy is correctly configured and the API key is valid.
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2. **Model Not Found**: Verify that the model ID is correct and available in your AWS region.
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3. **Streaming Issues**: Ensure your proxy supports the ConverseStream API endpoint.
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### Debugging
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Enable debug logging to see detailed request/response information:
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```bash
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ECA_LOG_LEVEL=debug eca
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```
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## References
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- [AWS Bedrock Documentation](https://docs.aws.amazon.com/bedrock/)
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- [AWS Bedrock Converse API](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_Converse.html)
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- [AWS Bedrock ConverseStream API](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_ConverseStream.html)

‎src/eca/llm_api.clj‎

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[clojure.string :as string]
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[eca.config :as config]
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[eca.llm-providers.anthropic :as llm-providers.anthropic]
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[eca.llm-providers.aws-bedrock]
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[eca.llm-providers.azure]
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[eca.llm-providers.copilot]
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[eca.llm-providers.deepseek]

‎src/eca/llm_providers/aws_bedrock.clj‎

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(ns eca.llm-providers.aws-bedrock
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"AWS Bedrock provider implementation using Converse/ConverseStream APIs.
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AUTHENTICATION:
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This implementation uses Bearer token authentication, which requires
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an external proxy/gateway that handles AWS SigV4 signing.
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Set BEDROCK_API_KEY environment variable or configure :key in config.clj
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with a token provided by your authentication proxy.
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ENDPOINTS:
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- Standard: https://your-proxy.com/model/{modelId}/converse
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- Streaming: https://your-proxy.com/model/{modelId}/converse-stream
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Configure the :url in your provider config to point to your proxy endpoint."
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(:require
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[cheshire.core :as json]
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[clojure.string :as str]
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[eca.logger :as logger]
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[hato.client :as http])
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(:import (java.io DataInputStream BufferedInputStream ByteArrayInputStream)))
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;; --- Helper Functions ---
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(defn resolve-model-id
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"Resolve model ID from configuration."
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[model-alias config]
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(let [keyword-alias (keyword model-alias)
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model-config (get-in config [:models keyword-alias])]
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(or (:modelName model-config)
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(name model-alias))))
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(defn format-tool-spec [tool]
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(let [f (:function tool)]
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{:toolSpec {:name (:name f)
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:description (:description f)
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;; AWS requires inputSchema wrapped in "json" key
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:inputSchema {:json (:parameters f)}}}))
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(defn format-tool-config [tools]
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(let [tools-seq (if (sequential? tools) tools [tools])]
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(when (seq tools-seq)
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{:tools (mapv format-tool-spec tools-seq)})))
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(defn parse-tool-result [content tool-call-id is-error?]
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(let [inner-content (try
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(if is-error?
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[{:text (str content)}]
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[{:json (json/parse-string content true)}])
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(catch Exception _
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[{:text (str content)}]))]
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{:toolUseId tool-call-id
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:content inner-content
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:status (if is-error? "error" "success")}))
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(defn message->bedrock [msg]
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(case (:role msg)
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"tool"
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{:role "user"
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:content [(parse-tool-result (:content msg)
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(:tool_call_id msg)
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(:error msg))]}
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"assistant"
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{:role "assistant"
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:content (if (:tool_calls msg)
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(mapv (fn [tc]
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{:toolUse {:toolUseId (:id tc)
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:name (get-in tc [:function :name])
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:input (json/parse-string
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(get-in tc [:function :arguments]) keyword)}})
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(:tool_calls msg))
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[{:text (:content msg)}])}
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;; Default/User
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{:role "user"
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:content [{:text (:content msg)}]}))
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(defn build-payload [messages options]
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(let [system-prompts (filter #(= (:role %) "system") messages)
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conversation (->> messages
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(remove #(= (:role %) "system"))
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(mapv message->bedrock))
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system-blocks (mapv (fn [m] {:text (:content m)}) system-prompts)
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;; Base inference config
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base-config {:maxTokens (or (:max_tokens options) (:maxTokens options) 1024)
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:temperature (or (:temperature options) 0.7)
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:topP (or (:top_p options) (:topP options) 1.0)}
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;; Additional model-specific fields (e.g., top_k for Claude)
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additional-fields (select-keys options [:top_k :topK])]
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(cond-> {:messages conversation
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:inferenceConfig (merge base-config
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(select-keys options [:stopSequences]))}
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(seq system-blocks)
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(assoc :system system-blocks)
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(:tools options)
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(assoc :toolConfig (format-tool-config (:tools options)))
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;; Add additionalModelRequestFields if present
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(seq additional-fields)
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(assoc :additionalModelRequestFields
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(into {} (map (fn [[k v]] [(name k) v]) additional-fields))))))
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(defn parse-bedrock-response [body]
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(let [response (json/parse-string body true)
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output-msg (get-in response [:output :message])
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stop-reason (:stopReason response)
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content (:content output-msg)
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usage (:usage response)]
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;; Log token usage if present
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(when usage
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(logger/debug "Token usage" {:input (:inputTokens usage)
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:output (:outputTokens usage)
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:total (:totalTokens usage)}))
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(if (= stop-reason "tool_use")
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(let [tool-blocks (filter :toolUse content)
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tool-calls (mapv (fn [b]
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(let [t (:toolUse b)]
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{:id (:toolUseId t)
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:type "function"
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:function {:name (:name t)
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:arguments (json/generate-string (:input t))}}))
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tool-blocks)]
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{:role "assistant" :content nil :tool_calls tool-calls})
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(let [text (-> (filter :text content) first :text)]
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{:role "assistant" :content text}))))
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;; --- Binary Stream Parser ---
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(defn parse-event-stream
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"Parses AWS Event Stream (Binary format) from a raw InputStream.
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AWS Event Stream Protocol:
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- Prelude: Total Length (4) + Headers Length (4)
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- Headers: Variable length
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- Headers CRC: 4 bytes
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- Payload: Variable length
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- Message CRC: 4 bytes"
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[^java.io.InputStream input-stream]
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(let [dis (DataInputStream. (BufferedInputStream. input-stream))]
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(lazy-seq
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(try
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;; 1. Read Prelude (8 bytes, Big Endian)
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(let [total-len (.readInt dis)
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headers-len (.readInt dis)]
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;; 2. Read and skip headers
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(when (> headers-len 0)
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(let [header-bytes (byte-array headers-len)]
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(.readFully dis header-bytes)))
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;; 3. Skip headers CRC (4 bytes)
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(.skipBytes dis 4)
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;; 4. Calculate and read payload
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;; total-len = prelude(8) + headers + headers-crc(4) + payload + message-crc(4)
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(let [payload-len (- total-len 8 headers-len 4 4)
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payload-bytes (byte-array payload-len)]
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(when (> payload-len 0)
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(.readFully dis payload-bytes))
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;; 5. Skip message CRC (4 bytes)
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(.skipBytes dis 4)
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;; 6. Parse JSON payload if present
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(if (> payload-len 0)
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(let [payload-str (String. payload-bytes "UTF-8")
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event (json/parse-string payload-str true)]
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(cons event (parse-event-stream dis)))
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;; Empty payload (heartbeat), continue to next event
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(parse-event-stream dis))))
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(catch java.io.EOFException _ nil)
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(catch Exception e
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(logger/debug "Stream parsing error" e)
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nil)))))
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(defn extract-text-deltas
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"Takes the sequence of parsed JSON events and extracts text content.
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Handles empty events (heartbeats) gracefully."
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[events]
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(vec (keep (fn [event]
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(when-let [delta (get-in event [:contentBlockDelta :delta])]
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(:text delta)))
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events)))
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;; --- Endpoint Construction ---
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(defn- build-endpoint
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"Constructs the API endpoint URL with model ID interpolation."
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[config model-id stream?]
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(let [raw-url (:url config)
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region (or (:region config) "us-east-1")
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suffix (if stream? "converse-stream" "converse")]
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(if raw-url
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;; Interpolate {modelId} in custom proxy URLs
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(str/replace raw-url "{modelId}" model-id)
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;; Construct standard AWS URL
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(format "https://bedrock-runtime.%s.amazonaws.com/model/%s/%s"
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region model-id suffix))))
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;; --- Public API Functions ---
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(defn chat! [config callbacks]
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(let [token (or (:key config) (System/getenv "BEDROCK_API_KEY"))
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model-id (resolve-model-id (:model config) config)
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endpoint (build-endpoint config model-id false)
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timeout (or (:timeout config) 30000)
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headers {"Authorization" (str "Bearer " token)
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"Content-Type" "application/json"}
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payload (build-payload (:user-messages config) (:extra-payload config))
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{:keys [status body error]} (http/post endpoint
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{:headers headers
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:body (json/generate-string payload)
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:timeout timeout})]
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(if (and (not error) (= 200 status))
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(let [response (parse-bedrock-response body)
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{:keys [on-message-received on-error on-prepare-tool-call on-tools-called on-usage-updated]} callbacks]
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(if-let [tool-calls (:tool_calls response)]
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(do
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(on-prepare-tool-call tool-calls)
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{:tools-to-call tool-calls})
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(do
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(on-message-received {:type :text :text (:content response)})
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{:output-text (:content response)})))
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(do
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(logger/error "Bedrock API error" {:status status :error error :body body})
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(throw (ex-info "Bedrock API error" {:status status :body body}))))))
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(defn stream-chat! [config callbacks]
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(let [token (or (:key config) (System/getenv "BEDROCK_API_KEY"))
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model-id (resolve-model-id (:model config) config)
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endpoint (build-endpoint config model-id true)
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timeout (or (:timeout config) 30000)
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headers {"Authorization" (str "Bearer " token)
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"Content-Type" "application/json"}
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payload (build-payload (:user-messages config) (:extra-payload config))
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{:keys [status body error]} (http/post endpoint
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{:headers headers
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:body (json/generate-string payload)
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:timeout timeout})]
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(if (and (not error) (= 200 status))
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(let [{:keys [on-message-received on-error]} callbacks
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events (parse-event-stream body)
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texts (extract-text-deltas events)]
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(doseq [text texts]
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(on-message-received {:type :text :text text}))
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{:output-text (str/join "" texts)})
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(do
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(logger/error "Bedrock Stream API error" {:status status :error error})
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(throw (ex-info "Bedrock Stream API error" {:status status}))))))

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