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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 | 49x 49x 49x 12x 12x 12x 12x 12x 12x 12x 12x 12x 1x 12x 3x 1x 2x 12x 12x 12x 1x 12x 12x 12x 12x 12x 12x 12x 2x 10x 10x 1x 9x 9x 9x 9x 17x 17x 17x 17x 17x 17x 17x 41x 41x 41x 39x 39x 9x 9x 9x 30x 30x 30x 29x 41x 22x 29x 29x 1x 3x 3x 12x 3x | import { ChatRequest, ChatChunk } from "../Provider.js";
import { Capabilities } from "./Capabilities.js";
import { handleOpenAIError } from "./Errors.js";
import { buildUrl } from "./utils.js";
import { APIError } from "../../errors/index.js";
import { logger } from "../../utils/logger.js";
import { fetchWithTimeout } from "../../utils/fetch.js";
import { OpenAIProvider } from "./OpenAIProvider.js";
import { mapSystemMessages } from "../utils.js";
export class OpenAIStreaming {
private readonly baseUrl: string;
constructor(
private readonly providerOrUrl: OpenAIProvider | string,
private readonly apiKey: string
) {
this.baseUrl = typeof providerOrUrl === "string" ? providerOrUrl : providerOrUrl.apiBase();
}
async *execute(request: ChatRequest, controller?: AbortController): AsyncGenerator<ChatChunk> {
const internalController = new AbortController();
const abortController = controller || internalController;
const signal = request.signal ? (request.signal as AbortSignal) : abortController.signal;
const temperature = Capabilities.normalizeTemperature(request.temperature, request.model);
const isMainOpenAI = this.baseUrl.includes("api.openai.com");
const supportsDeveloperRole =
isMainOpenAI &&
(typeof this.providerOrUrl === "string"
? Capabilities.supportsDeveloperRole(request.model)
: this.providerOrUrl.capabilities?.supportsDeveloperRole(request.model));
const mappedMessages = mapSystemMessages(request.messages, !!supportsDeveloperRole);
const body: Record<string, unknown> = {
model: request.model,
messages: mappedMessages,
stream: true
};
if (temperature !== undefined && temperature !== null) {
body.temperature = temperature;
}
if (request.max_tokens) {
if (Capabilities.needsMaxCompletionTokens(request.model)) {
body.max_completion_tokens = request.max_tokens;
} else {
body.max_tokens = request.max_tokens;
}
}
Iif (request.response_format) {
body.response_format = request.response_format;
}
Iif (request.tools && request.tools.length > 0) {
body.tools = request.tools;
}
if (request.thinking?.effort && request.thinking.effort !== "none") {
body.reasoning_effort = request.thinking.effort;
}
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 = buildUrl(this.baseUrl, "/chat/completions");
logger.logRequest("OpenAI", "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
},
request.requestTimeout
);
if (!response.ok) {
await handleOpenAIError(response, request.model);
}
logger.debug("OpenAI 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() || ""; // Keep the last incomplete part in the buffer
for (const line of lines) {
let trimmed = line.trim();
// Handle carriage returns
Iif (trimmed.endsWith("\r")) {
trimmed = trimmed.substring(0, trimmed.length - 1);
}
if (!trimmed.startsWith("data: ")) continue;
const data = trimmed.replace("data: ", "").trim();
if (data === "[DONE]") {
done = true;
// Yield final tool calls if any were accumulated
Iif (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
Iif (json.error) {
throw new APIError("OpenAI", response.status, json.error.message || "Stream error");
}
const delta = json.choices?.[0]?.delta;
// Handle content delta
if (delta?.content) {
yield { content: delta.content };
}
// Handle reasoning content delta
Iif (delta?.reasoning_content) {
yield { content: "", thinking: { text: delta.reasoning_content } };
}
// Handle tool calls delta
Iif (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)!;
if (toolCallDelta.id) existing.id = toolCallDelta.id;
if (toolCallDelta.function?.name) {
existing.function.name += toolCallDelta.function.name;
}
if (toolCallDelta.function?.arguments) {
existing.function.arguments += toolCallDelta.function.arguments;
}
}
}
}
} catch (e) {
// Re-throw APIError
Iif (e instanceof APIError) throw e;
// Ignore other parse errors
}
}
}
done = true;
} catch (e) {
// Graceful exit on abort
Iif (e instanceof Error && e.name === "AbortError") {
return;
}
throw e;
} finally {
// Cleanup: abort if user breaks early
if (!done) {
abortController.abort();
}
}
}
}
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