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Recover from fatal Ollama crash from LangChain library #693

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Merged
merged 1 commit into from
Feb 8, 2024
Merged

Recover from fatal Ollama crash from LangChain library #693

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77 changes: 51 additions & 26 deletions server/utils/AiProviders/ollama/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -119,9 +119,14 @@ class OllamaAILLM {
});
const textResponse = await model
.pipe(new StringOutputParser())
.invoke(this.#convertToLangchainPrototypes(messages));
.invoke(this.#convertToLangchainPrototypes(messages))
.catch((e) => {
throw new Error(
`Ollama::getChatCompletion failed to communicate with Ollama. ${e.message}`
);
});

if (!textResponse.length)
if (!textResponse || !textResponse.length)
throw new Error(`Ollama::sendChat text response was empty.`);

return textResponse;
Expand Down Expand Up @@ -150,9 +155,14 @@ class OllamaAILLM {
const model = this.#ollamaClient({ temperature });
const textResponse = await model
.pipe(new StringOutputParser())
.invoke(this.#convertToLangchainPrototypes(messages));
.invoke(this.#convertToLangchainPrototypes(messages))
.catch((e) => {
throw new Error(
`Ollama::getChatCompletion failed to communicate with Ollama. ${e.message}`
);
});

if (!textResponse.length)
if (!textResponse || !textResponse.length)
throw new Error(`Ollama::getChatCompletion text response was empty.`);

return textResponse;
Expand All @@ -170,34 +180,49 @@ class OllamaAILLM {
const { uuid = uuidv4(), sources = [] } = responseProps;

return new Promise(async (resolve) => {
let fullText = "";
for await (const chunk of stream) {
if (chunk === undefined)
throw new Error(
"Stream returned undefined chunk. Aborting reply - check model provider logs."
);

const content = chunk.hasOwnProperty("content") ? chunk.content : chunk;
fullText += content;
try {
let fullText = "";
for await (const chunk of stream) {
if (chunk === undefined)
throw new Error(
"Stream returned undefined chunk. Aborting reply - check model provider logs."
);

const content = chunk.hasOwnProperty("content")
? chunk.content
: chunk;
fullText += content;
writeResponseChunk(response, {
uuid,
sources: [],
type: "textResponseChunk",
textResponse: content,
close: false,
error: false,
});
}

writeResponseChunk(response, {
uuid,
sources: [],
sources,
type: "textResponseChunk",
textResponse: content,
close: false,
textResponse: "",
close: true,
error: false,
});
resolve(fullText);
} catch (error) {
writeResponseChunk(response, {
uuid,
sources: [],
type: "textResponseChunk",
textResponse: "",
close: true,
error: `Ollama:streaming - could not stream chat. ${
error?.cause ?? error.message
}`,
});
}

writeResponseChunk(response, {
uuid,
sources,
type: "textResponseChunk",
textResponse: "",
close: true,
error: false,
});
resolve(fullText);
});
}

Expand Down