package com.vincent.rsf.server.ai.service.impl.chat;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.vincent.rsf.framework.exception.CoolException;
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import com.vincent.rsf.server.ai.dto.AiChatDoneDto;
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import com.vincent.rsf.server.ai.dto.AiChatStatusDto;
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import com.vincent.rsf.server.ai.enums.AiErrorCategory;
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import com.vincent.rsf.server.ai.exception.AiChatException;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.ai.chat.metadata.ChatResponseMetadata;
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import org.springframework.ai.chat.metadata.Usage;
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import org.springframework.http.MediaType;
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import org.springframework.stereotype.Component;
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import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
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import java.io.IOException;
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import java.time.Instant;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.concurrent.atomic.AtomicReference;
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@Slf4j
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@Component
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@RequiredArgsConstructor
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public class AiSseEventPublisher {
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private final ObjectMapper objectMapper;
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public void markFirstToken(AtomicReference<Long> firstTokenAtRef, SseEmitter emitter, String requestId,
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Long sessionId, String model, long startedAt, AiChatTraceEmitter traceEmitter) {
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if (!firstTokenAtRef.compareAndSet(null, System.currentTimeMillis())) {
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return;
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}
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if (traceEmitter != null) {
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traceEmitter.startAnswer();
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}
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emitSafely(emitter, "status", AiChatStatusDto.builder()
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.requestId(requestId)
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.sessionId(sessionId)
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.status("FIRST_TOKEN")
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.model(model)
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.timestamp(Instant.now().toEpochMilli())
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.elapsedMs(System.currentTimeMillis() - startedAt)
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.firstTokenLatencyMs(resolveFirstTokenLatency(startedAt, firstTokenAtRef.get()))
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.build());
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}
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public void emitDone(SseEmitter emitter, String requestId, ChatResponseMetadata metadata, String fallbackModel,
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Long sessionId, long startedAt, Long firstTokenAt) {
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Usage usage = metadata == null ? null : metadata.getUsage();
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emitStrict(emitter, "done", AiChatDoneDto.builder()
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.requestId(requestId)
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.sessionId(sessionId)
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.model(metadata != null && metadata.getModel() != null && !metadata.getModel().isBlank() ? metadata.getModel() : fallbackModel)
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.elapsedMs(System.currentTimeMillis() - startedAt)
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.firstTokenLatencyMs(resolveFirstTokenLatency(startedAt, firstTokenAt))
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.promptTokens(usage == null ? null : usage.getPromptTokens())
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.completionTokens(usage == null ? null : usage.getCompletionTokens())
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.totalTokens(usage == null ? null : usage.getTotalTokens())
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.build());
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}
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public AiChatStatusDto buildTerminalStatus(String requestId, Long sessionId, String status, String model, long startedAt, Long firstTokenAt) {
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return AiChatStatusDto.builder()
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.requestId(requestId)
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.sessionId(sessionId)
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.status(status)
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.model(model)
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.timestamp(Instant.now().toEpochMilli())
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.elapsedMs(System.currentTimeMillis() - startedAt)
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.firstTokenLatencyMs(resolveFirstTokenLatency(startedAt, firstTokenAt))
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.build();
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}
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public Long resolveFirstTokenLatency(long startedAt, Long firstTokenAt) {
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return firstTokenAt == null ? null : Math.max(0L, firstTokenAt - startedAt);
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}
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public Map<String, String> buildMessagePayload(String... keyValues) {
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Map<String, String> payload = new LinkedHashMap<>();
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if (keyValues == null || keyValues.length == 0) {
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return payload;
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}
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if (keyValues.length % 2 != 0) {
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throw new CoolException("消息载荷参数必须成对出现");
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}
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for (int i = 0; i < keyValues.length; i += 2) {
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payload.put(keyValues[i], keyValues[i + 1] == null ? "" : keyValues[i + 1]);
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}
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return payload;
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}
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public void emitStrict(SseEmitter emitter, String eventName, Object payload) {
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try {
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String data = objectMapper.writeValueAsString(payload);
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emitter.send(SseEmitter.event()
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.name(eventName)
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.data(data, MediaType.APPLICATION_JSON));
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} catch (IOException e) {
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throw new AiChatException("AI_SSE_EMIT_ERROR", AiErrorCategory.STREAM, "SSE_EMIT", "SSE 输出失败: " + e.getMessage(), e);
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}
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}
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public void emitSafely(SseEmitter emitter, String eventName, Object payload) {
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try {
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emitStrict(emitter, eventName, payload);
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} catch (Exception e) {
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log.warn("AI SSE event emit skipped, eventName={}, message={}", eventName, e.getMessage());
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}
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}
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}
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