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...backend/src/main/java/com/comet/opik/api/resources/v1/events/LlmAsJudgeMessageRender.java
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|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package com.comet.opik.api.resources.v1.events; | ||
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| import com.comet.opik.api.AutomationRuleEvaluatorLlmAsJudge; | ||
| import com.comet.opik.api.Trace; | ||
| import com.fasterxml.jackson.databind.JsonNode; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.jayway.jsonpath.JsonPath; | ||
| import dev.ai4j.openai4j.chat.Message; | ||
| import dev.ai4j.openai4j.chat.SystemMessage; | ||
| import dev.ai4j.openai4j.chat.UserMessage; | ||
| import lombok.Builder; | ||
| import lombok.experimental.UtilityClass; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.commons.text.StringSubstitutor; | ||
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|
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| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.stream.Collectors; | ||
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| @UtilityClass | ||
| @Slf4j | ||
| public class LlmAsJudgeMessageRender { | ||
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| /** | ||
| * Render the rule evaluator message template using the values from an actual trace. | ||
| * | ||
| * As the rule my consist in multiple messages, we check each one of them for variables to fill. | ||
| * Then we go through every variable template to replace them for the value from the trace. | ||
| * | ||
| * @param trace the trace with value to use to replace template variables | ||
| * @param evaluatorCode the evaluator | ||
| * @return a list of AI messages, with templates rendered | ||
| */ | ||
| public static List<Message> renderMessages(Trace trace, | ||
| AutomationRuleEvaluatorLlmAsJudge.LlmAsJudgeCode evaluatorCode) { | ||
| // prepare the map of replacements to use in all messages | ||
| var parsedVariables = variableMapping(evaluatorCode.variables()); | ||
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| // extract the actual value from the Trace | ||
| var replacements = parsedVariables.stream().map(mapper -> { | ||
| var traceSection = switch (mapper.traceSection) { | ||
| case INPUT -> trace.input(); | ||
| case OUTPUT -> trace.output(); | ||
| case METADATA -> trace.metadata(); | ||
| }; | ||
|
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| return mapper.toBuilder() | ||
| .valueToReplace(extractFromJson(traceSection, mapper.jsonPath())) | ||
| .build(); | ||
| }) | ||
| .filter(mapper -> mapper.valueToReplace() != null) | ||
| .collect( | ||
| Collectors.toMap(LlmAsJudgeMessageRender.MessageVariableMapping::variableName, | ||
| LlmAsJudgeMessageRender.MessageVariableMapping::valueToReplace)); | ||
|
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| // will convert all '{{key}}' into 'value' | ||
| // TODO: replace with Mustache Java to be in confirm with FE | ||
| var templateRenderer = new StringSubstitutor(replacements, "{{", "}}"); | ||
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| // render the message templates from evaluator rule | ||
| return evaluatorCode.messages().stream() | ||
| .map(templateMessage -> { | ||
| var renderedMessage = templateRenderer.replace(templateMessage.content()); | ||
|
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| return switch (templateMessage.role()) { | ||
| case USER -> UserMessage.from(renderedMessage); | ||
| case SYSTEM -> SystemMessage.from(renderedMessage); | ||
| default -> { | ||
| log.info("No mapping for message role type {}", templateMessage.role()); | ||
| yield null; | ||
| } | ||
| }; | ||
| }) | ||
| .filter(Objects::nonNull) | ||
| .toList(); | ||
| } | ||
|
|
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| /** | ||
| * Parse evaluator\'s variable mapper into an usable list of | ||
| * | ||
| * @param evaluatorVariables a map with variables and a path into a trace input/output/metadata to replace | ||
| * @return a parsed list of mappings, easier to use for the template rendering | ||
| */ | ||
| public static List<MessageVariableMapping> variableMapping(Map<String, String> evaluatorVariables) { | ||
| return evaluatorVariables.entrySet().stream() | ||
| .map(mapper -> { | ||
| var templateVariable = mapper.getKey(); | ||
| var tracePath = mapper.getValue(); | ||
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| var builder = MessageVariableMapping.builder().variableName(templateVariable); | ||
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| if (tracePath.startsWith("input.")) { | ||
| builder.traceSection(TraceSection.INPUT) | ||
| .jsonPath("$" + tracePath.substring("input".length())); | ||
| } else if (tracePath.startsWith("output.")) { | ||
| builder.traceSection(TraceSection.OUTPUT) | ||
| .jsonPath("$" + tracePath.substring("output".length())); | ||
| } else if (tracePath.startsWith("metadata.")) { | ||
| builder.traceSection(TraceSection.METADATA) | ||
| .jsonPath("$" + tracePath.substring("metadata".length())); | ||
| } else { | ||
| log.info("Couldn't map trace path '{}' into a input/output/metadata path", tracePath); | ||
| return null; | ||
| } | ||
|
|
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| return builder.build(); | ||
| }) | ||
| .filter(Objects::nonNull) | ||
| .toList(); | ||
| } | ||
|
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| final ObjectMapper objectMapper = new ObjectMapper(); | ||
|
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| String extractFromJson(JsonNode json, String path) { | ||
| try { | ||
| // JsonPath didnt work with JsonNode, even explicitly using JacksonJsonProvider, so we convert to a Map | ||
| var forcedObject = objectMapper.convertValue(json, Map.class); | ||
| return JsonPath.parse(forcedObject).read(path); | ||
| } catch (Exception e) { | ||
| log.debug("Couldn't find path '{}' inside json {}: {}", path, json, e.getMessage()); | ||
| return null; | ||
| } | ||
| } | ||
|
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| public enum TraceSection { | ||
| INPUT, | ||
| OUTPUT, | ||
| METADATA | ||
| } | ||
|
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| @Builder(toBuilder = true) | ||
| public record MessageVariableMapping(TraceSection traceSection, String variableName, String jsonPath, | ||
| String valueToReplace) { | ||
| } | ||
| } |
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