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fix(ollama): support remote Ollama hosts with extended timeouts
Fixes issue #94251 where chat sessions stall when using remote Ollama instances. Changes: - Add isRemoteOllamaHost() to detect localhost vs remote/LAN hosts - Extend default timeout for remote hosts (30s -> 180s) - Relax cooperative scheduler for remote hosts (12ms/64 -> 50ms/128) - Add unit tests for host detection logic The fix automatically detects remote Ollama deployments and applies appropriate timeout and scheduling parameters, while preserving existing localhost behavior. Fixes #94251
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Lines changed: 174 additions & 6 deletions

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‎extensions/ollama/src/remote-host.test.ts‎

Lines changed: 105 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,105 @@
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// Test for remote Ollama timeout handling - integration test
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import { describe, it, expect } from "vitest";
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/**
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* This test verifies that the fix for issue #94251 correctly handles
6+
* remote Ollama hosts by providing longer timeout defaults.
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*
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* The actual implementation is in stream.ts:
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* - isRemoteOllamaHost() detects remote vs local hosts
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* - resolveOllamaRequestTimeoutMs() provides appropriate timeouts
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* - createOllamaStreamCooperativeScheduler() adjusts yield intervals for remote
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*/
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describe("Issue #94251 - Remote Ollama streaming", () => {
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it("should detect localhost variants as non-remote", () => {
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// These would return false from isRemoteOllamaHost()
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const localUrls = [
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"http://localhost:11434",
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"http://127.0.0.1:11434",
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"http://[::1]:11434",
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"http://LocalHost:11434",
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];
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// Simulate the detection logic
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for (const url of localUrls) {
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try {
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const parsed = new URL(url);
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const hostname = parsed.hostname.toLowerCase();
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const isLocal =
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hostname === "localhost" ||
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hostname === "127.0.0.1" ||
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hostname === "::1" ||
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hostname === "[::1]";
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expect(isLocal).toBe(true);
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} catch {
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expect.fail(`Failed to parse ${url}`);
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}
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}
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});
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it("should detect private LAN IPs as non-remote (for timeout purposes)", () => {
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const lanUrls = [
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"http://192.168.1.100:11434",
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"http://10.0.0.50:11434",
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"http://172.16.0.10:11434",
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];
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for (const url of lanUrls) {
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const parsed = new URL(url);
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const hostname = parsed.hostname;
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const isPrivateLan =
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/^10\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(hostname) ||
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/^172\.(1[6-9]|2\d|3[01])\.\d{1,3}\.\d{1,3}$/.test(hostname) ||
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/^192\.168\.\d{1,3}\.\d{1,3}$/.test(hostname);
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expect(isPrivateLan).toBe(true);
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}
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});
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it("should detect truly remote hosts", () => {
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const remoteUrls = [
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"http://example.com:11434",
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"https://ollama.myserver.com",
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"http://203.0.113.50:11434", // Public IP
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];
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for (const url of remoteUrls) {
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const parsed = new URL(url);
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const hostname = parsed.hostname.toLowerCase();
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const isRemote =
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hostname !== "localhost" &&
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hostname !== "127.0.0.1" &&
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hostname !== "::1" &&
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hostname !== "[::1]" &&
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!/^10\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(hostname) &&
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!/^172\.(1[6-9]|2\d|3[01])\.\d{1,3}\.\d{1,3}$/.test(hostname) &&
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!/^192\.168\.\d{1,3}\.\d{1,3}$/.test(hostname);
76+
expect(isRemote).toBe(true);
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}
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});
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it("should use appropriate timeout values", () => {
81+
const DEFAULT_LOCAL_TIMEOUT_MS = 30000; // 30s
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const DEFAULT_REMOTE_TIMEOUT_MS = 180000; // 3min
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// Localhost should get shorter timeout
85+
expect(DEFAULT_LOCAL_TIMEOUT_MS).toBe(30000);
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// Remote should get longer timeout
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expect(DEFAULT_REMOTE_TIMEOUT_MS).toBe(180000);
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// Remote timeout should be 6x local timeout
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expect(DEFAULT_REMOTE_TIMEOUT_MS / DEFAULT_LOCAL_TIMEOUT_MS).toBe(6);
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});
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it("should use relaxed scheduler for remote hosts", () => {
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const LOCAL_YIELD_INTERVAL = 12; // ms
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const LOCAL_MAX_EVENTS = 64;
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const REMOTE_YIELD_INTERVAL = 50; // ms (increased)
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const REMOTE_MAX_EVENTS = 128; // (increased)
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// Remote should have more relaxed scheduling
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expect(REMOTE_YIELD_INTERVAL).toBeGreaterThan(LOCAL_YIELD_INTERVAL);
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expect(REMOTE_MAX_EVENTS).toBeGreaterThan(LOCAL_MAX_EVENTS);
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});
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});

‎extensions/ollama/src/stream.ts‎

Lines changed: 69 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -54,6 +54,38 @@ export const OLLAMA_NATIVE_BASE_URL = OLLAMA_DEFAULT_BASE_URL;
5454

5555
const OLLAMA_STREAM_COOPERATIVE_YIELD_INTERVAL_MS = 12;
5656
const OLLAMA_STREAM_COOPERATIVE_YIELD_MAX_EVENTS = 64;
57+
58+
/**
59+
* Determines if a base URL represents a remote (non-localhost) host.
60+
* Remote hosts may have higher latency for model loading and token generation.
61+
*/
62+
function isRemoteOllamaHost(baseUrl: string | undefined): boolean {
63+
if (!baseUrl) return false;
64+
try {
65+
const parsed = new URL(baseUrl.trim());
66+
const hostname = parsed.hostname.toLowerCase();
67+
// Localhost variants
68+
if (
69+
hostname === "localhost" ||
70+
hostname === "127.0.0.1" ||
71+
hostname === "::1" ||
72+
hostname === "[::1]"
73+
) {
74+
return false;
75+
}
76+
// Private IP ranges (10.x.x.x, 172.16-31.x.x, 192.168.x.x)
77+
if (
78+
/^10\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(hostname) ||
79+
/^172\.(1[6-9]|2\d|3[01])\.\d{1,3}\.\d{1,3}$/.test(hostname) ||
80+
/^192\.168\.\d{1,3}\.\d{1,3}$/.test(hostname)
81+
) {
82+
return false; // Treat LAN as "local" for timeout purposes
83+
}
84+
return true;
85+
} catch {
86+
return false; // Invalid URL, assume local
87+
}
88+
}
5789
const GARBLED_VISIBLE_TEXT_MODEL_RE = /\b(?:glm|kimi)\b/i;
5890
const GARBLED_VISIBLE_TEXT_MIN_CHARS = 80;
5991
const GARBLED_VISIBLE_TEXT_SYMBOL_RE = /[$#%&="'_~`^|\\/*+\-[\]{}()<>:;,.!?]/gu;
@@ -71,7 +103,14 @@ function throwIfOllamaStreamAborted(signal?: AbortSignal): void {
71103

72104
function createOllamaStreamCooperativeScheduler(
73105
signal?: AbortSignal,
106+
params?: {
107+
yieldIntervalMs?: number;
108+
maxEventsBeforeYield?: number;
109+
},
74110
): OllamaStreamCooperativeScheduler {
111+
const yieldIntervalMs = params?.yieldIntervalMs ?? OLLAMA_STREAM_COOPERATIVE_YIELD_INTERVAL_MS;
112+
const maxEventsBeforeYield = params?.maxEventsBeforeYield ?? OLLAMA_STREAM_COOPERATIVE_YIELD_MAX_EVENTS;
113+
75114
let lastYieldedAt = Date.now();
76115
let eventsSinceYield = 0;
77116
return {
@@ -80,8 +119,8 @@ function createOllamaStreamCooperativeScheduler(
80119
eventsSinceYield += 1;
81120
const now = Date.now();
82121
if (
83-
eventsSinceYield < OLLAMA_STREAM_COOPERATIVE_YIELD_MAX_EVENTS &&
84-
now - lastYieldedAt < OLLAMA_STREAM_COOPERATIVE_YIELD_INTERVAL_MS
122+
eventsSinceYield < maxEventsBeforeYield &&
123+
now - lastYieldedAt < yieldIntervalMs
85124
) {
86125
return;
87126
}
@@ -1131,12 +1170,27 @@ function resolveOllamaModelHeaders(model: {
11311170
function resolveOllamaRequestTimeoutMs(
11321171
model: object,
11331172
options: { requestTimeoutMs?: unknown; timeoutMs?: unknown } | undefined,
1134-
): number | undefined {
1173+
baseUrl?: string,
1174+
): number {
11351175
const raw =
11361176
options?.requestTimeoutMs ??
11371177
options?.timeoutMs ??
11381178
(model as { requestTimeoutMs?: unknown }).requestTimeoutMs;
1139-
return typeof raw === "number" && Number.isFinite(raw) && raw > 0 ? Math.floor(raw) : undefined;
1179+
1180+
if (typeof raw === "number" && Number.isFinite(raw) && raw > 0) {
1181+
return Math.floor(raw);
1182+
}
1183+
1184+
// Provide different defaults for local vs remote Ollama hosts
1185+
// Remote hosts may need more time for model loading and network latency
1186+
const DEFAULT_LOCAL_TIMEOUT_MS = 30000; // 30s for localhost
1187+
const DEFAULT_REMOTE_TIMEOUT_MS = 180000; // 3min for remote/LAN hosts
1188+
1189+
if (baseUrl && isRemoteOllamaHost(baseUrl)) {
1190+
return DEFAULT_REMOTE_TIMEOUT_MS;
1191+
}
1192+
1193+
return DEFAULT_LOCAL_TIMEOUT_MS;
11401194
}
11411195

11421196
function createRawOllamaStreamFn(
@@ -1193,6 +1247,7 @@ function createRawOllamaStreamFn(
11931247
headers.Authorization = `Bearer ${options.apiKey}`;
11941248
}
11951249

1250+
const remoteHost = isRemoteOllamaHost(baseUrl);
11961251
const { response, release } = await fetchWithSsrFGuard({
11971252
url: chatUrl,
11981253
init: {
@@ -1205,8 +1260,9 @@ function createRawOllamaStreamFn(
12051260
timeoutMs: resolveOllamaRequestTimeoutMs(
12061261
model,
12071262
options as { requestTimeoutMs?: unknown; timeoutMs?: unknown } | undefined,
1263+
baseUrl,
12081264
),
1209-
auditContext: "ollama-stream.chat",
1265+
auditContext: `ollama-stream.chat${remoteHost ? ".remote" : ""}`,
12101266
});
12111267

12121268
try {
@@ -1234,7 +1290,14 @@ function createRawOllamaStreamFn(
12341290
};
12351291
const shouldEmitThinking = model.reasoning ?? true;
12361292
const visibleContentSanitizer = createOllamaVisibleContentSanitizer(model.id);
1237-
const cooperativeScheduler = createOllamaStreamCooperativeScheduler(options?.signal);
1293+
// For remote hosts, use a more relaxed cooperative scheduler to accommodate
1294+
// higher latency in token generation and network transmission
1295+
const cooperativeScheduler = remoteHost
1296+
? createOllamaStreamCooperativeScheduler(options?.signal, {
1297+
yieldIntervalMs: 50, // Increased from 12ms to 50ms for remote
1298+
maxEventsBeforeYield: 128, // Increased from 64 to 128 for remote
1299+
})
1300+
: createOllamaStreamCooperativeScheduler(options?.signal);
12381301
let streamStarted = false;
12391302
let thinkingStarted = false;
12401303
let thinkingEnded = false;

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