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919 lines (764 loc) · 34.6 KB
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import std/[asynchttpserver, asyncdispatch, asyncnet]
import std/[os, cmdline, strutils, strformat, json, tables, options, times, sequtils, parseutils]
import libchatllm
type
RequestHandler* = proc(request: Request) {.async gcsafe.}
Router* = object
## Called when the HTTP method is not registered for the route
errorHandler*: RequestErrorHandler
## Called when the route request handler raises an Exception
routes*: seq[Route]
RequestErrorHandler* = proc(request: Request, e: ref Exception) {.async gcsafe.}
Route = object
httpMethod: HttpMethod
route: string
handler: RequestHandler
proc addRoute(router: var Router, httpMethod: HttpMethod, route: string | static string, handler: RequestHandler) =
router.routes.add(Route(httpMethod: httpMethod, route: route, handler: handler))
proc get*(router: var Router, route: string | static string, handler: RequestHandler) =
router.addRoute(HttpMethod.HttpGet, route, handler)
proc head*(router: var Router, route: string | static string, handler: RequestHandler) =
router.addRoute(HttpMethod.HttpHead, route, handler)
proc post*(router: var Router, route: string | static string, handler: RequestHandler) =
router.addRoute(HttpMethod.HttpPost, route, handler)
proc put*(router: var Router, route: string | static string, handler: RequestHandler) =
router.addRoute(HttpMethod.HttpPut, route, handler)
proc delete*(router: var Router, route: string | static string, handler: RequestHandler) =
router.addRoute(HttpMethod.HttpDelete, route, handler)
proc options*(router: var Router, route: string | static string, handler: RequestHandler) =
router.addRoute(HttpMethod.HttpOptions, route, handler)
proc defaultNotFoundHandler(request: Request) {.async gcsafe.} =
const body = "<h1>Not Found</h1>"
echo "TODO: handler is missing for ", request.reqMethod, " ", request.url.path
if request.reqMethod == HttpMethod.HttpHead:
let headers = {"Content-type": "text/html", "Content-Length": $body.len}
await request.respond(Http404, "", headers.newHttpHeaders())
else:
let headers = {"Content-type": "text/html"}
await request.respond(Http404, body, headers.newHttpHeaders())
proc defaultMethodNotAllowedHandler(request: Request) {.async gcsafe.} =
const body = "<h1>Method Not Allowed</h1>"
echo "TODO: handler is missing for ", request.reqMethod, " ", request.url.path
if request.reqMethod == HttpMethod.HttpHead:
let headers = {"Content-type": "text/html", "Content-Length": $body.len}
await request.respond(Http405, "", headers.newHttpHeaders())
else:
let headers = {"Content-type": "text/html"}
await request.respond(Http405, body, headers.newHttpHeaders())
proc toHandler*(router: Router): RequestHandler =
return proc(request: Request) {.async .} =
echo $request.reqMethod & " " & request.url.path
## All requests arrive here to be routed
template notFound() =
await defaultNotFoundHandler(request)
let path = request.url.path
if path.len == 0 or path[0] != '/':
notFound()
return
try:
var matchedSomeRoute: bool = false
for route in router.routes:
if route.route == path:
matchedSomeRoute = true
if request.reqMethod == route.httpMethod: # We have a winner
await route.handler(request)
request.client.close()
return
if matchedSomeRoute: # We matched a route but not the HTTP method
await defaultMethodNotAllowedHandler(request)
else:
notFound()
except Exception as e:
if router.errorHandler != nil:
await router.errorHandler(request, e)
else:
raise e
type
StreamerType = enum
Chat = "chat"
FIM = "fim"
Emb = "emb"
FlatMessage = tuple[role: string; content: seq[tuple[t: string, content: string]]]
StreamerWithHistory = ref object of Streamer
history: seq[tuple[pos: int; messages: seq[FlatMessage]]]
tokens_start: int
const ARG_SEP = "---"
var port = 11434
var ui: string = ""
var streamer_table = initTable[StreamerType, StreamerWithHistory]()
converter toStreamerType(s: string): StreamerType =
for t in StreamerType:
if s == $t: return t
raise newException(ValueError, s)
proc get_streamer(t: StreamerType): StreamerWithHistory {.gcsafe.} =
{.cast(gcsafe).}:
result = streamer_table.getOrDefault(t, nil)
if result != nil:
if result.busy():
result.abort()
while result.busy():
sleep(10)
proc newStreamerWithHistory*(args: openArray[string], auto_restart: bool = false): StreamerWithHistory =
var streamer: StreamerWithHistory
new(streamer)
let r = initStreamer(streamer, args, auto_restart)
result = if r: streamer else: nil
func flatten(messages: JsonNode, sys_prompt: var string): seq[FlatMessage] =
result = @[]
for m in messages.getElems():
let role = m["role"].getStr()
if role == "system":
sys_prompt &= m["content"].getStr()
continue
if (result.len < 1) or (result[^1].role != role):
result.add (role: role, content: @[(t: "text", content: "")])
var t = "text"
case m["content"].kind:
of JString:
if result[^1].content[^1].t == "text":
result[^1].content[^1].content &= m["content"].getStr()
else:
result[^1].content.add (t: t, content: m["content"].getStr())
of JObject:
t = m["content"]["type"].getStr()
if t == "input_audio":
result[^1].content.add (t: t, content: m["content"][t]["data"].getStr())
elif "url" in t:
result[^1].content.add (t: t, content: m["content"][t]["url"].getStr())
else:
result[^1].content.add (t: t, content: m["content"]["text"].getStr())
of JArray:
for o in m["content"].getElems():
t = o["type"].getStr()
if t == "input_audio":
result[^1].content.add (t: t, content: o[t]["data"].getStr())
elif "url" in t:
result[^1].content.add (t: t, content: o[t]["url"].getStr())
elif o.contains("text"):
result[^1].content.add (t: t, content: o["text"].getStr())
else:
raise newException(ValueError, fmt"""expected kind: {m["content"].kind}""")
proc start_chat(streamer: StreamerWithHistory, messages: JsonNode): bool =
result = false
var sys_prompt = ""
let msg = flatten(messages, sys_prompt)
if streamer.system_prompt != sys_prompt:
streamer.history = @[]
streamer.set_system_prompt(sys_prompt)
streamer.flush()
var k = 0
var pos = -1
block search:
for i in 0..<streamer.history.len:
let items = streamer.history[i]
for j in 0..<items.messages.len:
if k >= msg.len:
break search
if msg[k] != items.messages[j]:
pos = i - 1
break search
inc k
if k >= msg.len:
pos = streamer.history.len - 2
elif pos < 0:
pos = streamer.history.len - 1
if pos >= 0:
if pos < streamer.history.len - 1:
if streamer.history.len >= pos + 2:
streamer.history.delete(pos + 1, streamer.history.len - 1)
discard streamer.set_cursor(streamer.history[pos].pos)
else:
streamer.restart()
streamer.history = @[]
k = 0
for i in 0..pos:
let items = streamer.history[i]
k += items.messages.len
func extract_base64(s: string): string =
# data:image/png;base64,
doAssert s.startswith("data:")
let pos = s.find(";base64,")
doAssert pos > 0
return s.substr(pos + 8)
proc add_mm_msg(parts: openArray[tuple[t: string, content: string]]) =
streamer.llm.chatllm_multimedia_msg_prepare()
for m in parts:
case m.t:
of "text":
discard streamer.llm.chatllm_multimedia_msg_append("text", m.content.cstring)
of "image_url":
discard streamer.llm.chatllm_multimedia_msg_append("image", extract_base64(m.content).cstring)
of "audio_url":
discard streamer.llm.chatllm_multimedia_msg_append("audio", extract_base64(m.content).cstring)
of "video_url":
discard streamer.llm.chatllm_multimedia_msg_append("video", extract_base64(m.content).cstring)
of "input_audio":
discard streamer.llm.chatllm_multimedia_msg_append("audio", m.content.cstring)
streamer.history.add (pos: -1, messages: @[])
for i in k..<msg.len: streamer.history[^1].messages.add msg[i]
while k <= msg.len - 2:
add_mm_msg(msg[k].content)
case msg[k].role:
of "user":
discard streamer.llm.chatllm_history_append_multimedia_msg(cint(RoleType.ROLE_USER))
of "assistant":
discard streamer.llm.chatllm_history_append_multimedia_msg(cint(RoleType.ROLE_ASSISTANT))
else:
discard streamer.llm.chatllm_history_append_multimedia_msg(cint(RoleType.ROLE_TOOL))
inc(k)
streamer.tokens_start = streamer.get_cursor()
case msg[^1].role:
of "user":
add_mm_msg(msg[^1].content)
result = streamer.llm.chatllm_async_user_input_multimedia_msg() == 0
of "tool":
doAssert (msg[^1].content.len == 1) and (msg[^1].content[0].t == "text")
result = streamer.llm.chatllm_async_tool_completion(msg[^1].content[0].content.cstring) == 0
else:
raise newException(ValueError, fmt"unexpected {msg[^1].role}")
if result:
streamer.is_generating = true
proc sendCode(req: Request, code: HttpCode): Future[void] =
var msg = "HTTP/1.1 " & $code & "\c\L"
result = req.client.send(msg)
proc sendStr(req: Request, str: string): Future[void] =
result = req.client.send(str)
type
APIUsage = object
prompt_tokens: int = 1
completion_tokens: Option[int]
total_tokens: int = 1
ChatMessageTimings = object
cache_n: int = 0
predicted_ms: float = 0.0
predicted_n: int = 0
prompt_ms: float = 0.0
prompt_n: int = 0
ChunkChoiceDelta = object
role: string = "assistant"
content: Option[string] = none(string)
reasoning_content: Option[string] = none(string)
ChunkChoice = object
delta: ChunkChoiceDelta
index: int = 0
logprobs: Option[string]
finish_reason: Option[string]
CompletionChunkResponse = object
id: string
created: int
model: string
choices: seq[ChunkChoice]
`object`: string = "chat.completion.chunk"
system_fingerprint: string = "fp_xxx"
timings: Option[ChatMessageTimings] = none(ChatMessageTimings)
CompletionResponse = object
id: string
created: int
model: string
choices: seq[ChunkChoice]
`object`: string = "chat.completion.chunk"
system_fingerprint: string = "fp_xxx"
usage: APIUsage
HttpResponder = ref object of RootObj
req: Request
timestamp: int
model: string
id: string
timings: ChatMessageTimings
ChatCompletionStreamResponder = ref object of HttpResponder
ChatCompletionNonStreamResponder = ref object of HttpResponder
type
OllamaChatRspMessage = object
role: string = "assistant"
content: string = ""
thinking: Option[string] = none(string)
OllamaChatResponse = object
model: string
created_at: string
message: OllamaChatRspMessage
done: bool = false
done_reason: Option[string] = none(string)
total_duration: int
load_duration: int
prompt_eval_count: int
prompt_eval_duration: int
eval_count: int
eval_duration: int
OllamaChatStreamResponder = ref object of HttpResponder
OllamaChatNonStreamResponder = ref object of HttpResponder
proc initHttpResponder(responder: HttpResponder, req: Request, timestamp: int, model, id: string) =
responder.req = req
responder.timestamp = timestamp
responder.model = model
responder.id = id
method recv_chunk(self: HttpResponder, chunk: string): Future[bool] {.async base gcsafe.} =
result = true
method recv_thought(self: HttpResponder, chunk: string): Future[bool] {.async base gcsafe.} =
result = true
method done(self: HttpResponder; all, thought: string, prompt_tokens, completion_tokens: int): Future[bool] {.async base gcsafe.} =
result = true
method send_str(self: HttpResponder, s: string): Future[bool] {.async base gcsafe.} =
try:
await self.req.client.send(s, {})
result = true
except:
echo "send error"
result = false
proc newChatCompletionStreamResponder(req: Request, timestamp: int, model, id: string): ChatCompletionStreamResponder =
new(result)
initHttpResponder(result, req, timestamp, model, id)
method recv_chunk(self: ChatCompletionStreamResponder, chunk: string): Future[bool] {.async.} =
var rsp = CompletionChunkResponse(id: self.id, created: self.timestamp, model: self.model)
rsp.choices.add(ChunkChoice(delta: ChunkChoiceDelta(content: some(chunk))))
rsp.timings = some(self.timings)
return await self.send_str("data: " & $(%* rsp) & "\n\n")
method recv_thought(self: ChatCompletionStreamResponder, chunk: string): Future[bool] {.async.} =
var rsp = CompletionChunkResponse(id: self.id, created: self.timestamp, model: self.model)
rsp.choices.add(ChunkChoice(delta: ChunkChoiceDelta(reasoning_content: some(chunk))))
rsp.timings = some(self.timings)
return await self.send_str("data: " & $(%* rsp) & "\n\n")
method done(self: ChatCompletionStreamResponder; all, thought: string, prompt_tokens, completion_tokens: int): Future[bool] {.async.} =
var rsp = CompletionResponse(id: self.id, created: self.timestamp, model: self.model)
rsp.usage = APIUsage(prompt_tokens: prompt_tokens, completion_tokens: some(completion_tokens), total_tokens: prompt_tokens + completion_tokens)
rsp.choices.add(ChunkChoice(delta: ChunkChoiceDelta(), finish_reason: some("stop")))
return await self.send_str("data: " & $(%* rsp) & "\n\ndata: [DONE]\n")
proc newChatCompletionNoneStreamResponder(req: Request, timestamp: int, model, id: string): ChatCompletionNonStreamResponder =
new(result)
initHttpResponder(result, req, timestamp, model, id)
method done(self: ChatCompletionNonStreamResponder; all, thought: string, prompt_tokens, completion_tokens: int): Future[bool] {.async.} =
var rsp = CompletionResponse(id: self.id, created: self.timestamp, model: self.model)
rsp.usage = APIUsage(prompt_tokens: prompt_tokens, completion_tokens: some(completion_tokens), total_tokens: prompt_tokens + completion_tokens)
rsp.choices.add(ChunkChoice(
delta: ChunkChoiceDelta(content: some(all), reasoning_content: if thought != "": some(thought) else: none(string)),
finish_reason: some("stop")))
return await self.send_str($(%* rsp) & "\n\n")
proc newOllamaChatStreamResponder(req: Request, timestamp: int, model, id: string): OllamaChatStreamResponder =
new(result)
initHttpResponder(result, req, timestamp, model, id)
method recv_chunk(self: OllamaChatStreamResponder, chunk: string): Future[bool] {.async.} =
var rsp = OllamaChatResponse(model: self.model, created_at: $ self.timestamp.fromUnix())
rsp.message.content = chunk
return await self.send_str($(%* rsp) & "\n")
method recv_thought(self: OllamaChatStreamResponder, chunk: string): Future[bool] {.async.} =
var rsp = OllamaChatResponse(model: self.model, created_at: $ self.timestamp.fromUnix())
rsp.message.thinking = some(chunk)
return await self.send_str($(%* rsp) & "\n")
method done(self: OllamaChatStreamResponder; all, thought: string, prompt_tokens, completion_tokens: int): Future[bool] {.async.} =
var rsp = OllamaChatResponse(model: self.model, created_at: $ self.timestamp.fromUnix())
rsp.done = true
rsp.done_reason = some("stop")
return await self.send_str($(%* rsp) & "\n")
proc newOllamaChatNonStreamResponder(req: Request, timestamp: int, model, id: string): OllamaChatNonStreamResponder =
new(result)
initHttpResponder(result, req, timestamp, model, id)
method done(self: OllamaChatNonStreamResponder; all, thought: string, prompt_tokens, completion_tokens: int): Future[bool] {.async.} =
var rsp = OllamaChatResponse(model: self.model, created_at: $ self.timestamp.fromUnix())
rsp.message.content = all
if thought.len > 0: rsp.message.thinking = some(thought)
rsp.done = true
rsp.done_reason = some("stop")
return await self.send_str($(%* rsp) & "\n")
proc send_headers(req: Request, headers: seq[(string, string)]) {.async gcsafe.} =
await req.sendHeaders(headers.newHttpHeaders)
proc send_header(req: Request, name, value: string) {.async gcsafe.} =
await req.sendHeaders([(name, value)].newHttpHeaders)
proc end_headers(req: Request, length: int = -1) {.async gcsafe.} =
let more = [("Access-Control-Allow-Origin", "*"),
("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT"),
("Access-Control-Max-Age", "0"),
("Access-Control-Allow-Headers", "Content-Type,Access-Token,Authorization,ybg")]
await req.sendHeaders(more.newHttpHeaders)
if length > 0:
let more = [("Content-Length", $ length)]
await req.sendHeaders(more.newHttpHeaders)
await req.client.send "\c\L"
proc end_headers_send(req: Request, response: string) {.async gcsafe.} =
await req.end_headers(response.len)
await req.client.send response
proc do_completions(req: Request, streamer: StreamerWithHistory, cls: HttpResponder, messages: JsonNode, contentType: string) {.async gcsafe.} =
let headers = @[("Cache-Control", "no-cache"),
("vary", "origin, access-control-request-method, access-control-request-headers"),
("access-control-allow-credentials", "true"),
("x-content-type-options", "nosniff")]
if (messages == nil) or (messages.kind != JArray):
await req.respond(Http404, "`messages` is missing")
return
let t_prompt_start = cpuTime()
if not streamer.start_chat(messages):
await req.respond(Http404, "Interval error")
return
await req.sendCode(Http200)
await req.send_headers(headers)
await req.send_header("Content-type", contentType)
await req.end_headers()
cls.timings.cache_n = streamer.tokens_start
var waiting_first = true
var t_prediction_start = 0.0
var predict_tok_n = 0
for chunk in chunks(streamer):
if req.client.isClosed():
streamer.abort()
break
var t = cpuTime()
if waiting_first:
waiting_first = false
predict_tok_n = streamer.get_cursor() - 1
t_prediction_start = t
cls.timings.prompt_n = streamer.get_cursor() - cls.timings.cache_n
cls.timings.prompt_ms = (t - t_prompt_start) * 1000
cls.timings.predicted_n = streamer.get_cursor() - predict_tok_n
cls.timings.predicted_ms = (t - t_prediction_start) * 1000
case chunk[0]:
of ChunkType.Chat:
if not await cls.recv_chunk(chunk[1]):
streamer.abort()
break
of ChunkType.Thought:
if not await cls.recv_thought(chunk[1]):
streamer.abort()
break
else: discard
streamer.history[^1].messages.add (role: "assistant", content: @[(t: "text", content: streamer.acc)])
streamer.history[^1].pos = streamer.get_cursor()
if streamer.tokens_start > streamer.history[^1].pos:
streamer.tokens_start = streamer.history[^1].pos
if not req.client.isClosed():
discard await cls.done(streamer.acc, streamer.thought_acc, cls.timings.prompt_n, cls.timings.predicted_n)
streamer.acc = ""
proc handle_completions(req: Request) {.async gcsafe.} =
let streamer = get_streamer(StreamerType.Chat)
if streamer == nil:
await req.respond(Http404, "model not available")
return
let body = parseJson(req.body)
let stream = body.getOrDefault("stream").getBool()
let model = body.getOrDefault("model").getStr("chat")
let timestamp = getTime().toUnix()
let id = "id_" & $streamer.id()
streamer.set_max_gen_tokens(body.getOrDefault("max_tokens").getInt(-1))
let contentType = if stream: "text/event-stream; charset=utf-8" else: "application/json"
let cls: HttpResponder = if stream: newChatCompletionStreamResponder(req, timestamp, model, id) else: newChatCompletionNoneStreamResponder(req, timestamp, model, id)
await do_completions(req, streamer, cls, body["messages"], contentType)
proc handle_ollama_chat(req: Request) {.async gcsafe.} =
let streamer = get_streamer(StreamerType.Chat)
if streamer == nil:
await req.respond(Http404, "model not available")
return
let body = parseJson(req.body)
let stream = body.getOrDefault("stream").getBool()
let model = body.getOrDefault("model").getStr("chat")
let timestamp = getTime().toUnix()
let id = "id_" & $streamer.id()
streamer.set_max_gen_tokens(body.getOrDefault("max_tokens").getInt(-1))
let contentType = if stream: "application/x-ndjson" else: "application/json"
let cls: HttpResponder = if stream: newOllamaChatStreamResponder(req, timestamp, model, id) else: newOllamaChatNonStreamResponder(req, timestamp, model, id)
await do_completions(req, streamer, cls, body["messages"], contentType)
func parse_embedding(s: string): seq[float] =
result = @[]
for w in s.tokenize({',', ' ', '\n', '\r'}):
if w[1]: continue
result.add parseFloat(w[0])
proc handle_embeddings(req: Request) {.async gcsafe.} =
let streamer = get_streamer(StreamerType.Emb)
if streamer == nil:
await req.respond(Http404, "model not available")
return
let body = parseJson(req.body)
let model = body.getOrDefault("model").getStr()
let encoding_format = body.getOrDefault("encoding_format").getStr("float")
if encoding_format != "float":
await req.respond(Http404, fmt"unsupported {encoding_format}")
return
var inputs = newSeq[string]()
let input = body.getOrDefault("input")
if input.kind == JString:
inputs.add input.getStr()
elif input.kind == JArray:
for s in input.getElems():
inputs.add(s.getStr())
if inputs.len < 1:
await req.respond(Http404, fmt"malformed input")
return
let headers = @[("Cache-Control", "no-cache"),
("vary", "origin, access-control-request-method, access-control-request-headers"),
("access-control-allow-credentials", "true"),
("x-content-type-options", "nosniff"),
("Content-type", "application/json")]
type
EmbObject = object
`object`: string = "embedding"
embedding: seq[float]
index: int
Result = object
`object`: string = "list"
data: seq[EmbObject]
model: string
usage: APIUsage
await req.sendCode(Http200)
var r = Result(data: @[], model: model)
for i in 0 ..< inputs.len:
var o = EmbObject(index: i)
discard streamer.llm.chatllm_embedding(inputs[i].cstring, cint(EmbeddingPurpose.EMBEDDING_FOR_DOC))
o.embedding = parse_embedding(streamer.result_embedding)
r.data.add o
await req.send_headers(headers)
await req.end_headers_send($(%* r))
proc handle_index(req: Request) {.async gcsafe.} =
const defaultUI {.strdefine: "defaultUI".}: string = currentSourcePath.parentDir() & "/../scripts/chat_ui.html"
const compiled_file = readFile(defaultUI)
var headers = @[("Content-type", "text/html; charset=utf-8")]
{.cast(gcsafe).}:
let fn_ui = if ui != "": ui else: defaultUI
let content = if ui != "": readFile(ui) else: compiled_file
if fn_ui.endswith(".gz"):
headers.add ("Content-Encoding", "gzip")
await req.respond(Http200, content, headers.newHttpHeaders())
proc handle_oai_models(req: Request) {.async gcsafe.} =
type
Meta = object
n_params: int
n_ctx_train: int
Info = object
id: string
`object`: string = "model"
created: int
owned_by: string = "You"
meta: Meta
Infos = object
`object`: string = "list"
data: seq[Info]
var infos = Infos()
let streamer = get_streamer(StreamerType.Chat)
if streamer != nil:
let info = parseJson(streamer.model_info)
var m = Info(id: info["name"].getStr(), created: now().toTime().toUnix())
m.meta.n_params = info["param_num"].getInt()
m.meta.n_ctx_train = info["training_context_length"].getInt()
infos.data.add(m)
let headers = {"Content-type": "application/json"}
await req.respond(Http200, $(%* infos), headers.newHttpHeaders())
func format_model_name(info: JsonNode): string =
let name = info.getOrDefault("name").getStr()
let native = info.getOrDefault("native_name").getStr()
let n = info.getOrDefault("param_num").getInt()
result = fmt"{name}-{float(n)/1000000000.0:.1f}B"
if native != "":
result = result & fmt" ({native})"
proc handle_ollama_tags(req: Request) {.async gcsafe.} =
type
Details = object
format: string = "ggmm"
family: string = "llm"
families: seq[string] = @["llm"]
parameter_size: string
quantization_level: string = "Q8_0"
Info = object
name: string
model: string
modified_at: string = "2025-01-01T00:00:00.0+00:00"
size: int = 100
digest: string = "123"
details: Details
Infos = object
models: seq[Info]
{.cast(gcsafe).}:
var tags = Infos(models: @[])
for k in streamer_table.keys():
let info = parseJson(streamer_table[k].model_info)
var m = Info(model: info["name"].getStr() & ":latest", name: info["name"].getStr())
let n = info.getOrDefault("param_num").getInt()
m.details.parameter_size = fmt"{float(n)/1000000000.0:.1f}B"
tags.models.add(m)
let headers = {"Content-type": "application/json"}
await req.respond(Http200, $(%* tags), headers.newHttpHeaders())
proc handle_ollama_version(req: Request) {.async gcsafe.} =
let rsp = """{"version": "0.13.0"}"""
let headers = {"Content-type": "application/json"}
await req.respond(Http200, rsp, headers.newHttpHeaders())
proc handle_ollama_show(req: Request) {.async gcsafe.} =
let reqObj = parseJson(req.body)
var model_name = if reqObj.contains("model"): reqObj["model"].getStr() else: ""
if model_name.endswith(":latest"): model_name = model_name[0..^8]
var model: JsonNode = nil
{.cast(gcsafe).}:
for k in streamer_table.keys():
let info = parseJson(streamer_table[k].model_info)
if info["name"].getStr() == model_name:
model = info
break
if model == nil:
await req.respond(Http404, "NOT FOUND")
return
var rsp = parseJson("{}")
var info = parseJson("{}")
info["general.parameter_count"] = model["param_num"]
info["llama.context_length"] = model["context_length"]
rsp["template"] = %"|placeholder|"
rsp["model_info"] = info
rsp["capabilities"] = newJArray()
const mapping = toTable({"Text Embedding": "embedding", "Ranker": "ranking", "Text": "completion", "Image Input": "vision", "Audio Input": "audio"})
for s in model["capabilities"].getElems():
let ss = s.getStr()
if ss in mapping:
rsp["capabilities"].add(% mapping[ss])
let headers = {"Content-type": "application/json"}
await req.respond(Http200, $(%* rsp), headers.newHttpHeaders())
proc handle_ollama_ps(req: Request) {.async gcsafe.} =
type
Details = object
parent_model: string = ""
format: string = "ggmm"
family: string = "llm"
families: seq[string] = @["llm"]
parameter_size: string
quantization_level: string = "Q8_0"
Info = object
model: string
size: int = 100
digest: string = "123"
expires_at: string = "2125-01-01T00:00:00.0+00:00"
size_vram: int = 100
context_length: int
details: Details
Infos = object
models: seq[Info]
var tags = Infos(models: @[])
{.cast(gcsafe).}:
for k in streamer_table.keys():
let info = parseJson(streamer_table[k].model_info)
var m = Info(model: info["name"].getStr(), context_length: info["context_length"].getInt())
let n = info.getOrDefault("param_num").getInt()
m.details.parameter_size = fmt"{float(n)/1000000000.0:.1f}B"
tags.models.add(m)
let headers = {"Content-type": "application/json"}
await req.respond(Http200, $(%* tags), headers.newHttpHeaders())
proc handle_llama_health(req: Request) {.async gcsafe.} =
let headers = {"Content-type": "application/json"}
await req.respond(Http200, "{\"status\": \"ok\"}", headers.newHttpHeaders())
proc handle_llama_props(req: Request) {.async gcsafe.} =
type
Empty = object
Modalities = object
vision: bool = false
audio: bool = false
GenerationSettings = object
id: int = 0
id_task: int = -1
n_ctx: int = 0
speculative: bool = false
is_processing: bool
params: Empty
Props = object
default_generation_settings: GenerationSettings
total_slots: int = 1
model_alias: string = ""
model_path: string = "/some/where"
modalities: Modalities
build_info: string = "Today"
var props = Props()
var streamer = get_streamer(StreamerType.Chat)
if streamer != nil:
let info = parseJson(streamer.model_info)
let capabilities = info.getOrDefault("capabilities")
props.default_generation_settings.n_ctx = info["context_length"].getInt()
props.default_generation_settings.is_processing = streamer.busy()
props.model_alias = format_model_name(info)
for c in capabilities.getElems():
if c.getStr() == "Image Input":
props.modalities.vision = true
elif (c.getStr() == "Audio Input") or (c.getStr() == "ASR"):
props.modalities.audio = true
let headers = {"Content-type": "application/json"}
await req.respond(Http200, $(%* props), headers.newHttpHeaders())
proc handle_llama_slots(req: Request) {.async gcsafe.} =
type
Params = object
n_predict: int = -1
seed: int = 1
temperature: float = 0.8
dynatemp_rang: float = 0.0
dynatemp_exponent: float = 1.0
top_k: int = 40
Slot = object
id: int = 0
id_task: int = 1
n_ctx: int = 0
speculative: bool = false
is_processing: bool
params: Params
var slot = Slot()
var streamer = get_streamer(StreamerType.Chat)
if streamer != nil:
let info = parseJson(streamer.model_info)
slot.n_ctx = info.getOrDefault("context_length").getInt()
slot.is_processing = streamer.busy()
let headers = {"Content-type": "application/json"}
await req.respond(Http200, $(%* [slot]), headers.newHttpHeaders())
proc run {.async.} =
var server = newAsyncHttpServer()
var router = Router()
router.get "/", handle_index
# OAI-compatible
router.post "/v1/chat/completions", handle_completions
router.post "/v1/embeddings", handle_embeddings
router.get "/v1/models", handle_oai_models
# llama-compatible
router.get "/props", handle_llama_props
router.get "/slots", handle_llama_slots
router.get "/health", handle_llama_health
# ollama-compatible
router.get "/api/tags", handle_ollama_tags
router.get "/api/version", handle_ollama_version
router.post "/api/show", handle_ollama_show
router.get "/api/ps", handle_ollama_ps
router.post "/api/chat", handle_ollama_chat
server.listen(Port(port))
let port = server.getPort
echo "Serving at curl http://localhost:" & $port.uint16 & "/"
while true:
if server.shouldAcceptRequest():
try:
await server.acceptRequest(router.toHandler())
except:
discard
else:
await sleepAsync(500)
proc main(): int =
if paramCount() < 1:
echo fmt"usage: {paramStr(0)} [app_args] [{ARG_SEP}TYPE path/to/model [additional args]]"
echo fmt"where app_args :: --ui /path/to/ui --port PORT"
echo fmt"where TYPE ::= chat | fim | emb"
return -1
var args: seq[string] = @[]
for i in 1..paramCount():
args.add paramStr(i)
var args_tab = initTable[StreamerType, seq[string]]()
for t in StreamerType:
args_tab[t] = @["-m"]
while args.len > 0:
if args[0] == "--ui":
doAssert args.len >= 2
ui = args[1]
args.delete(0, 1)
elif args[0] == "--port":
doAssert args.len >= 2
port = parseInt(args[1])
args.delete(0, 1)
elif args[0].startswith(ARG_SEP):
break
else:
raise newException(ValueError, fmt"bad argument: {args[0]}")
var current: ptr seq[string] = nil
for i in 0 ..< args.len:
if args[i].startswith(ARG_SEP):
let tag = args[i][len(ARG_SEP)..^1]
current = addr args_tab[tag]
else:
doAssert current != nil
current[].add(args[i])
for t in StreamerType:
if args_tab[t].len > 1:
streamer_table[t] = newStreamerWithHistory(args_tab[t])
waitFor run()
return 0
quit(main())