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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| local CONTENT_TYPE_JSON = "application/json" | ||
| local core = require("apisix.core") | ||
| local bad_request = ngx.HTTP_BAD_REQUEST | ||
| local internal_server_error = ngx.HTTP_INTERNAL_SERVER_ERROR | ||
| local schema = require("apisix.plugins.ai-proxy.schema") | ||
| local ngx_req = ngx.req | ||
| local ngx_print = ngx.print | ||
| local ngx_flush = ngx.flush | ||
|
|
||
| local function keepalive_or_close(conf, httpc) | ||
| if conf.set_keepalive then | ||
| httpc:set_keepalive(10000, 100) | ||
| return | ||
| end | ||
| httpc:close() | ||
| end | ||
|
|
||
| local _M = {} | ||
|
|
||
| function _M.new(proxy_request_to_llm_func, get_model_name_func) | ||
| return function(conf, ctx) | ||
| local ct = core.request.header(ctx, "Content-Type") or CONTENT_TYPE_JSON | ||
| if not core.string.has_prefix(ct, CONTENT_TYPE_JSON) then | ||
| return bad_request, "unsupported content-type: " .. ct | ||
| end | ||
|
|
||
| local request_table, err = core.request.get_json_request_body_table() | ||
| if not request_table then | ||
| return bad_request, err | ||
| end | ||
|
|
||
| local ok, err = core.schema.check(schema.chat_request_schema, request_table) | ||
| if not ok then | ||
| return bad_request, "request format doesn't match schema: " .. err | ||
| end | ||
|
|
||
| request_table.model = get_model_name_func(conf) | ||
|
|
||
| if core.table.try_read_attr(conf, "model", "options", "stream") then | ||
| request_table.stream = true | ||
| end | ||
|
|
||
| local res, err, httpc = proxy_request_to_llm_func(conf, request_table, ctx) | ||
| if not res then | ||
| core.log.error("failed to send request to LLM service: ", err) | ||
| return internal_server_error | ||
| end | ||
|
|
||
| local body_reader = res.body_reader | ||
| if not body_reader then | ||
| core.log.error("LLM sent no response body") | ||
| return internal_server_error | ||
| end | ||
|
|
||
| if conf.passthrough then | ||
| ngx_req.init_body() | ||
| while true do | ||
| local chunk, err = body_reader() -- will read chunk by chunk | ||
| if err then | ||
| core.log.error("failed to read response chunk: ", err) | ||
| break | ||
| end | ||
| if not chunk then | ||
| break | ||
| end | ||
| ngx_req.append_body(chunk) | ||
| end | ||
| ngx_req.finish_body() | ||
| keepalive_or_close(conf, httpc) | ||
| return | ||
| end | ||
|
|
||
| if request_table.stream then | ||
| while true do | ||
| local chunk, err = body_reader() -- will read chunk by chunk | ||
| if err then | ||
| core.log.error("failed to read response chunk: ", err) | ||
| break | ||
| end | ||
| if not chunk then | ||
| break | ||
| end | ||
| ngx_print(chunk) | ||
| ngx_flush(true) | ||
| end | ||
| keepalive_or_close(conf, httpc) | ||
| return | ||
| else | ||
| local res_body, err = res:read_body() | ||
| if not res_body then | ||
| core.log.error("failed to read response body: ", err) | ||
| return internal_server_error | ||
| end | ||
| keepalive_or_close(conf, httpc) | ||
| return res.status, res_body | ||
| end | ||
| end | ||
| end | ||
|
|
||
| return _M |