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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | 22x 22x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 10x 1x 1x 9x 9x 1x 8x 8x 8x 8x 18x 18x 18x 18x 18x 18x 18x 164x 164x 164x 164x 164x 7x 7x 1x 1x 7x 157x 157x 157x 1x 155x 164x 164x 164x 148x 155x 3x 3x 3x 1x 2x 2x 2x 2x 2x 2x 4x 1x 3x 11x 4x | import { ChatRequest, ChatChunk } from "../Provider.js";
import { APIError } from "../../errors/index.js";
import { logger } from "../../utils/logger.js";
import { mapSystemMessages } from "../utils.js";
import { fetchWithTimeout } from "../../utils/fetch.js";
export class DeepSeekStreaming {
constructor(
private readonly baseUrl: string,
private readonly apiKey: string
) {}
async *execute(request: ChatRequest, controller?: AbortController): AsyncGenerator<ChatChunk> {
const abortController = controller || new AbortController();
const {
model,
messages,
tools,
max_tokens,
response_format,
thinking: _thinking,
headers: _headers,
requestTimeout,
...rest
} = request;
const mappedMessages = mapSystemMessages(messages, false);
const body: Record<string, unknown> = {
model,
messages: mappedMessages,
stream: true,
...rest
};
if (max_tokens) body.max_tokens = max_tokens;
Iif (tools && tools.length > 0) body.tools = tools;
Iif (response_format) body.response_format = response_format;
let done = false;
// Track tool calls being built across chunks
const toolCallsMap = new Map<
number,
{ id: string; type: string; function: { name: string; arguments: string } }
>();
try {
const url = `${this.baseUrl}/chat/completions`;
logger.logRequest("DeepSeek", "POST", url, body);
const response = await fetchWithTimeout(
url,
{
method: "POST",
headers: {
Authorization: `Bearer ${this.apiKey}`,
"Content-Type": "application/json",
...request.headers
},
body: JSON.stringify(body),
signal: abortController.signal
},
requestTimeout
);
if (!response.ok) {
const errorText = await response.text();
throw new Error(`DeepSeek API error: ${response.status} - ${errorText}`);
}
logger.debug("DeepSeek streaming started", {
status: response.status,
statusText: response.statusText
});
if (!response.body) {
throw new Error("No response body for streaming");
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = "";
while (true) {
const { value, done: readerDone } = await reader.read();
Iif (readerDone) break;
const chunk = decoder.decode(value, { stream: true });
buffer += chunk;
const lines = buffer.split("\n\n");
buffer = lines.pop() || "";
for (const line of lines) {
let trimmed = line.trim();
// Handle carriage returns
Iif (trimmed.endsWith("\r")) {
trimmed = trimmed.substring(0, trimmed.length - 1);
}
Iif (!trimmed.startsWith("data: ")) continue;
const data = trimmed.replace("data: ", "").trim();
if (data === "[DONE]") {
done = true;
// Yield final tool calls if any were accumulated
if (toolCallsMap.size > 0) {
const toolCalls = Array.from(toolCallsMap.values()).map((tc) => ({
id: tc.id,
type: "function" as const,
function: {
name: tc.function.name,
arguments: tc.function.arguments
}
}));
yield { content: "", tool_calls: toolCalls, done: true };
}
return;
}
try {
const json = JSON.parse(data);
// Check for errors in the data
if (json.error) {
throw new APIError("DeepSeek", response.status, json.error.message || "Stream error");
}
const delta = json.choices?.[0]?.delta;
const deltaContent = delta?.content;
const deltaReasoning = delta?.reasoning_content;
if (deltaContent || deltaReasoning) {
yield {
content: deltaContent || "",
reasoning: deltaReasoning || "",
thinking: deltaReasoning ? { text: deltaReasoning } : undefined
};
}
// Handle tool calls delta
if (delta?.tool_calls) {
for (const toolCallDelta of delta.tool_calls) {
const index = toolCallDelta.index;
if (!toolCallsMap.has(index)) {
toolCallsMap.set(index, {
id: toolCallDelta.id || "",
type: "function",
function: {
name: toolCallDelta.function?.name || "",
arguments: toolCallDelta.function?.arguments || ""
}
});
} else {
const existing = toolCallsMap.get(index)!;
Iif (toolCallDelta.id) existing.id = toolCallDelta.id;
Iif (toolCallDelta.function?.name) {
existing.function.name += toolCallDelta.function.name;
}
Eif (toolCallDelta.function?.arguments) {
existing.function.arguments += toolCallDelta.function.arguments;
}
}
}
}
} catch (e) {
// Re-throw APIError
if (e instanceof APIError) throw e;
// Ignore other parse errors
}
}
}
done = true;
} catch (e) {
// Graceful exit on abort
if (e instanceof Error && e.name === "AbortError") {
return;
}
throw e;
} finally {
// Cleanup: abort if user breaks early
if (!done) {
abortController.abort();
}
}
}
}
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