haraldwolff/llama.cpp
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Simple webchat for server (#1998)

Browse source 
* expose simple web interface on root domain

* embed index and add --path for choosing static dir

* allow server to multithread

because web browsers send a lot of garbage requests we want the server
to multithread when serving 404s for favicon's etc. To avoid blowing up
llama we just take a mutex when it's invoked.


* let's try this with the xxd tool instead and see if msvc is happier with that

* enable server in Makefiles

* add /completion.js file to make it easy to use the server from js

* slightly nicer css

* rework state management into session, expose historyTemplate to settings

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Tobias Lütke 2023-07-04 10:05:27 -04:00 committed by GitHub
parent acc111caf9
commit 7ee76e45af
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 3416 additions and 8 deletions
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2
CMakeLists.txt
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@ -79,7 +79,7 @@ option(LLAMA_QKK_64 "llama: use super-block size of 64
option(LLAMA_BUILD_TESTS "llama: build tests" ${LLAMA_STANDALONE})
option(LLAMA_BUILD_EXAMPLES "llama: build examples" ${LLAMA_STANDALONE})
option(LLAMA_BUILD_SERVER "llama: build server example" OFF)
option(LLAMA_BUILD_SERVER "llama: build server example" ON)
#
# Build info header

193
examples/server/completion.js.hpp Normal file
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@ -0,0 +1,193 @@
unsigned char completion_js[] = {
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unsigned int completion_js_len = 2275;

22
examples/server/deps.sh Executable file
View file

@ -0,0 +1,22 @@
#!/bin/bash
# Download and update deps for binary
# get the directory of this script file
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
PUBLIC=$DIR/public
OUTPUT=$DIR/templats.hpp
echo "// Generated file, do not edit" > $OUTPUT
echo "" > $OUTPUT
echo "download js bundle files"
curl https://npm.reversehttp.com/@preact/signals-core,@preact/signals,htm/preact,preact,preact/hooks > $PUBLIC/index.js
echo >> $PUBLIC/index.js # add newline
FILES=$(ls $PUBLIC)
for FILE in $FILES; do
func=$(echo $FILE | tr '.' '_')
echo "generate $FILE.hpp ($func)"
xxd -n $func -i $PUBLIC/$FILE > $DIR/$FILE.hpp
done

846
examples/server/index.html.hpp Normal file
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@ -0,0 +1,846 @@
unsigned char index_html[] = {
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};
unsigned int index_html_len = 10108;

1851
examples/server/index.js.hpp Normal file
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File diff suppressed because it is too large Load diff

81
examples/server/public/completion.js Normal file
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@ -0,0 +1,81 @@
const paramDefaults = {
stream: true,
n_predict: 500,
temperature: 0.2,
stop: ["</s>"]
};
/**
* This function completes the input text using a llama dictionary.
* @param {object} params - The parameters for the completion request.
* @param {object} controller - an instance of AbortController if you need one, or null.
* @param {function} callback - The callback function to call when the completion is done.
* @returns {string} the completed text as a string. Ideally ignored, and you get at it via the callback.
*/
export const llamaComplete = async (params, controller, callback) => {
if (!controller) {
controller = new AbortController();
}
const completionParams = { ...paramDefaults, ...params };
// we use fetch directly here becasue the built in fetchEventSource does not support POST
const response = await fetch("/completion", {
method: 'POST',
body: JSON.stringify(completionParams),
headers: {
'Connection': 'keep-alive',
'Content-Type': 'application/json',
'Accept': 'text/event-stream'
},
signal: controller.signal,
});
const reader = response.body.getReader();
const decoder = new TextDecoder();
let content = "";
try {
let cont = true;
while (cont) {
const result = await reader.read();
if (result.done) {
break;
}
// sse answers in the form multiple lines of: value\n with data always present as a key. in our case we
// mainly care about the data: key here, which we expect as json
const text = decoder.decode(result.value);
// parse all sse events and add them to result
const regex = /^(\S+):\s(.*)$/gm;
for (const match of text.matchAll(regex)) {
result[match[1]] = match[2]
}
// since we know this is llama.cpp, let's just decode the json in data
result.data = JSON.parse(result.data);
content += result.data.content;
// callack
if (callback) {
cont = callback(result) != false;
}
// if we got a stop token from server, we will break here
if (result.data.stop) {
break;
}
}
} catch (e) {
console.error("llama error: ", e);
throw e;
}
finally {
controller.abort();
}
return content;
}

359
examples/server/public/index.html Normal file
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@ -0,0 +1,359 @@
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
<title>llama.cpp - chat</title>
<style>
body {
background-color: #fff;
color: #000;
font-family: system-ui;
font-size: 90%;
}
#container {
margin: 0em auto;
display: flex;
flex-direction: column;
justify-content: space-between;
height: 100%;
}
header, footer {
text-align: center;
}
main {
margin: 3px;
display: flex;
flex-direction: column;
justify-content: space-between;
gap: 1em;
flex-grow: 1;
overflow-y: auto;
border: 1px solid #ccc;
border-radius: 5px;
padding: 0.5em;
}
body {
max-width: 600px;
min-width: 300px;
line-height: 1.2;
margin: 0 auto;
padding: 0 0.5em;
}
p {
overflow-wrap: break-word;
word-wrap: break-word;
hyphens: auto;
margin-top: 0.5em;
margin-bottom: 0.5em;
}
#write form {
margin: 1em 0 0 0;
display: flex;
flex-direction: column;
gap: 0.5em;
align-items: stretch;
}
.right {
display: flex;
flex-direction: row;
gap: 0.5em;
justify-content: flex-end;
}
fieldset {
border: none;
padding: 0;
margin: 0;
}
textarea {
padding: 5px;
flex-grow: 1;
width: 100%;
}
pre code {
display: block;
background-color: #222;
color: #ddd;
}
code {
font-family: monospace;
padding: 0.1em 0.3em;
border-radius: 3px;
}
fieldset label {
margin: 0.5em 0;
display: block;
}
</style>
<script type="module">
import {
html, h, signal, effect, computed, render, useSignal, useEffect, useRef
} from '/index.js';
import { llamaComplete } from '/completion.js';
const session = signal({
prompt: "This is a conversation between user and llama, a friendly chatbot. respond in markdown.",
template: "{{prompt}}\n\n{{history}}\n{{char}}:",
historyTemplate: "{{name}}: {{message}}",
transcript: [],
type: "chat",
char: "llama",
user: "User",
})
const transcriptUpdate = (transcript) => {
session.value = {
...session.value,
transcript
}
}
const chatStarted = computed(() => session.value.transcript.length > 0)
const params = signal({
n_predict: 400,
temperature: 0.7,
repeat_last_n: 256,
repeat_penalty: 1.18,
top_k: 40,
top_p: 0.5,
})
const controller = signal(null)
const generating = computed(() => controller.value == null )
// simple template replace
const template = (str, extraSettings) => {
let settings = session.value;
if (extraSettings) {
settings = { ...settings, ...extraSettings };
}
return String(str).replaceAll(/\{\{(.*?)\}\}/g, (_, key) => template(settings[key]));
}
// send message to server
const chat = async (msg) => {
if (controller.value) {
console.log('already running...');
return;
}
controller.value = new AbortController();
transcriptUpdate([...session.value.transcript, ["{{user}}", msg]])
const payload = template(session.value.template, {
message: msg,
history: session.value.transcript.flatMap(([name, message]) => template(session.value.historyTemplate, {name, message})).join("\n"),
});
let currentMessage = '';
const history = session.value.transcript
const llamaParams = {
...params.value,
prompt: payload,
stop: ["</s>", template("{{char}}:"), template("{{user}}:")],
}
await llamaComplete(llamaParams, controller.value, (message) => {
const data = message.data;
currentMessage += data.content;
// remove leading whitespace
currentMessage = currentMessage.replace(/^\s+/, "")
transcriptUpdate([...history, ["{{char}}", currentMessage]])
if (data.stop) {
console.log("-->", data, ' response was:', currentMessage, 'transcript state:', session.value.transcript);
}
})
controller.value = null;
}
function MessageInput() {
const message = useSignal("")
const stop = (e) => {
e.preventDefault();
if (controller.value) {
controller.value.abort();
controller.value = null;
}
}
const reset = (e) => {
stop(e);
transcriptUpdate([]);
}
const submit = (e) => {
stop(e);
chat(message.value);
message.value = "";
}
const enterSubmits = (event) => {
if (event.which === 13 && !event.shiftKey) {
submit(event);
}
}
return html`
<form onsubmit=${submit}>
<div>
<textarea type="text" rows=2 onkeypress=${enterSubmits} value="${message}" oninput=${(e) => message.value = e.target.value} placeholder="Say something..."/>
</div>
<div class="right">
<button type="submit" disabled=${!generating.value} >Send</button>
<button onclick=${stop} disabled=${generating}>Stop</button>
<button onclick=${reset}>Reset</button>
</div>
</form>
`
}
const ChatLog = (props) => {
const messages = session.value.transcript;
const container = useRef(null)
useEffect(() => {
// scroll to bottom (if needed)
if (container.current && container.current.scrollHeight <= container.current.scrollTop + container.current.offsetHeight + 300) {
container.current.scrollTo(0, container.current.scrollHeight)
}
}, [messages])
const chatLine = ([user, msg]) => {
return html`<p key=${msg}><strong>${template(user)}:</strong> <${Markdown} text=${template(msg)} /></p>`
};
return html`
<section id="chat" ref=${container}>
${messages.flatMap(chatLine)}
</section>`;
};
const ConfigForm = (props) => {
const updateSession = (el) => session.value = { ...session.value, [el.target.name]: el.target.value }
const updateParams = (el) => params.value = { ...params.value, [el.target.name]: el.target.value }
const updateParamsFloat = (el) => params.value = { ...params.value, [el.target.name]: parseFloat(el.target.value) }
return html`
<form>
<fieldset>
<div>
<label for="prompt">Prompt</label>
<textarea type="text" name="prompt" value="${session.value.prompt}" rows=4 oninput=${updateSession}/>
</div>
<div>
<label for="user">User name</label>
<input type="text" name="user" value="${session.value.user}" oninput=${updateSession} />
</div>
<div>
<label for="bot">Bot name</label>
<input type="text" name="char" value="${session.value.char}" oninput=${updateSession} />
</div>
<div>
<label for="template">Prompt template</label>
<textarea id="template" name="template" value="${session.value.template}" rows=4 oninput=${updateSession}/>
</div>
<div>
<label for="template">Chat history template</label>
<textarea id="template" name="historyTemplate" value="${session.value.historyTemplate}" rows=1 oninput=${updateSession}/>
</div>
<div>
<label for="temperature">Temperature</label>
<input type="range" id="temperature" min="0.0" max="1.0" step="0.01" name="temperature" value="${params.value.temperature}" oninput=${updateParamsFloat} />
<span>${params.value.temperature}</span>
</div>
<div>
<label for="nPredict">Predictions</label>
<input type="range" id="nPredict" min="1" max="2048" step="1" name="n_predict" value="${params.value.n_predict}" oninput=${updateParamsFloat} />
<span>${params.value.n_predict}</span>
</div>
<div>
<label for="repeat_penalty">Penalize repeat sequence</label>
<input type="range" id="repeat_penalty" min="0.0" max="2.0" step="0.01" name="repeat_penalty" value="${params.value.repeat_penalty}" oninput=${updateParamsFloat} />
<span>${params.value.repeat_penalty}</span>
</div>
<div>
<label for="repeat_last_n">Consider N tokens for penalize</label>
<input type="range" id="repeat_last_n" min="0.0" max="2048" name="repeat_last_n" value="${params.value.repeat_last_n}" oninput=${updateParamsFloat} />
<span>${params.value.repeat_last_n}</span>
</div>
</fieldset>
</form>
`
}
const Markdown = (params) => {
const md = params.text
.replace(/^#{1,6} (.*)$/gim, '<h3>$1</h3>')
.replace(/\*\*(.*?)\*\*/g, '<strong>$1</strong>')
.replace(/__(.*?)__/g, '<strong>$1</strong>')
.replace(/\*(.*?)\*/g, '<em>$1</em>')
.replace(/_(.*?)_/g, '<em>$1</em>')
.replace(/```.*?\n([\s\S]*?)```/g, '<pre><code>$1</code></pre>')
.replace(/`(.*?)`/g, '<code>$1</code>')
.replace(/\n/gim, '<br />');
return html`<span dangerouslySetInnerHTML=${{ __html: md }} />`;
};
function App(props) {
return html`
<div id="container">
<header>
<h1>llama.cpp</h1>
</header>
<main id="content">
<${chatStarted.value ? ChatLog : ConfigForm} />
</main>
<footer id="write">
<${MessageInput} />
</footer>
<footer>
<p>Powered by <a href="https://github.com/ggerganov/llama.cpp">llama.cpp</a> and <a href="https://ggml.ai">ggml.ai</a></p>
</footer>
</div>
`;
}
render(h(App), document.body);
</script>
</head>
<body>
</body>
</html>

1
examples/server/public/index.js Normal file
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69
examples/server/server.cpp
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@ -2,8 +2,6 @@
#include "llama.h"
#include "build-info.h"
// single thread
#define CPPHTTPLIB_THREAD_POOL_COUNT 1
#ifndef NDEBUG
// crash the server in debug mode, otherwise send an http 500 error
#define CPPHTTPLIB_NO_EXCEPTIONS 1
@ -12,6 +10,11 @@
#include "httplib.h"
#include "json.hpp"
// auto generated files (update with ./deps.sh)
#include "index.html.hpp"
#include "index.js.hpp"
#include "completion.js.hpp"
#ifndef SERVER_VERBOSE
#define SERVER_VERBOSE 1
#endif
@ -21,6 +24,7 @@ using json = nlohmann::json;
struct server_params {
std::string hostname = "127.0.0.1";
std::string public_path = "examples/server/public";
int32_t port = 8080;
int32_t read_timeout = 600;
int32_t write_timeout = 600;
@ -172,6 +176,12 @@ struct llama_server_context {
std::string stopping_word;
int32_t multibyte_pending = 0;
std::mutex mutex;
std::unique_lock<std::mutex> lock() {
return std::unique_lock<std::mutex>(mutex);
}
~llama_server_context() {
if (ctx) {
llama_free(ctx);
@ -539,6 +549,7 @@ static void server_print_usage(const char * argv0, const gpt_params & params,
fprintf(stderr, " --lora-base FNAME optional model to use as a base for the layers modified by the LoRA adapter\n");
fprintf(stderr, " --host ip address to listen (default (default: %s)\n", sparams.hostname.c_str());
fprintf(stderr, " --port PORT port to listen (default (default: %d)\n", sparams.port);
fprintf(stderr, " --path PUBLIC_PATH path from which to serve static files (default %s)\n", sparams.public_path.c_str());
fprintf(stderr, " -to N, --timeout N server read/write timeout in seconds (default: %d)\n", sparams.read_timeout);
fprintf(stderr, " --embedding enable embedding vector output (default: %s)\n", params.embedding ? "enabled" : "disabled");
fprintf(stderr, "\n");
@ -565,6 +576,12 @@ static void server_params_parse(int argc, char ** argv, server_params & sparams,
break;
}
sparams.hostname = argv[i];
} else if (arg == "--path") {
if (++i >= argc) {
invalid_param = true;
break;
}
sparams.public_path = argv[i];
} else if (arg == "--timeout" || arg == "-to") {
if (++i >= argc) {
invalid_param = true;
@ -839,17 +856,24 @@ static void parse_options_completion(const json & body, llama_server_context & l
LOG_VERBOSE("completion parameters parsed", format_generation_settings(llama));
}
static void log_server_request(const Request & req, const Response & res) {
LOG_INFO("request", {
{ "remote_addr", req.remote_addr },
{ "remote_port", req.remote_port },
{ "status", res.status },
{ "method", req.method },
{ "path", req.path },
{ "params", req.params },
});
LOG_VERBOSE("request", {
{ "request", req.body },
{ "response", res.body },
});
}
int main(int argc, char ** argv) {
// own arguments required by this example
gpt_params params;
@ -884,16 +908,34 @@ int main(int argc, char ** argv) {
Server svr;
svr.set_default_headers({
{ "Server", "llama.cpp" },
{ "Access-Control-Allow-Origin", "*" },
{ "Access-Control-Allow-Headers", "content-type" }
});
// this is only called if no index.js is found in the public --path
svr.Get("/index.js", [](const Request &, Response & res) {
res.set_content(reinterpret_cast<const char *>(&index_js), index_js_len, "text/javascript");
return false;
});
// this is only called if no index.html is found in the public --path
svr.Get("/", [](const Request &, Response & res) {
res.set_content("<h1>llama.cpp server works</h1>", "text/html");
res.set_content(reinterpret_cast<const char*>(&index_html), index_html_len, "text/html");
return false;
});
// this is only called if no index.html is found in the public --path
svr.Get("/completion.js", [](const Request &, Response & res) {
res.set_content(reinterpret_cast<const char*>(&completion_js), completion_js_len, "application/javascript");
return false;
});
svr.Post("/completion", [&llama](const Request & req, Response & res) {
auto lock = llama.lock();
llama.rewind();
llama_reset_timings(llama.ctx);
parse_options_completion(json::parse(req.body), llama);
@ -1002,6 +1044,8 @@ int main(int argc, char ** argv) {
});
svr.Post("/tokenize", [&llama](const Request & req, Response & res) {
auto lock = llama.lock();
const json body = json::parse(req.body);
const std::string content = body.value("content", "");
const std::vector<llama_token> tokens = llama_tokenize(llama.ctx, content, false);
@ -1010,6 +1054,8 @@ int main(int argc, char ** argv) {
});
svr.Post("/embedding", [&llama](const Request & req, Response & res) {
auto lock = llama.lock();
const json body = json::parse(req.body);
llama.rewind();
@ -1040,18 +1086,27 @@ int main(int argc, char ** argv) {
res.status = 500;
});
svr.set_error_handler([](const Request &, Response & res) {
res.set_content("File Not Found", "text/plain");
res.status = 404;
});
// set timeouts and change hostname and port
svr.set_read_timeout(sparams.read_timeout);
svr.set_write_timeout(sparams.write_timeout);
if (!svr.bind_to_port(sparams.hostname, sparams.port)) {
LOG_ERROR("couldn't bind to server socket", {
{ "hostname", sparams.hostname },
{ "port", sparams.port },
});
fprintf(stderr, "\ncouldn't bind to server socket: hostname=%s port=%d\n\n", sparams.hostname.c_str(), sparams.port);
return 1;
}
// Set the base directory for serving static files
svr.set_base_dir(sparams.public_path);
// to make it ctrl+clickable:
fprintf(stdout, "\nllama server listening at http://%s:%d\n\n", sparams.hostname.c_str(), sparams.port);
LOG_INFO("HTTP server listening", {
{ "hostname", sparams.hostname },
{ "port", sparams.port },