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Current Path : /proc/thread-self/root/opt/imunify360-webshield/lualib/ngx/ |
Current File : //proc/thread-self/root/opt/imunify360-webshield/lualib/ngx/balancer.lua |
-- Copyright (C) Yichun Zhang (agentzh) local base = require "resty.core.base" base.allows_subsystem('http', 'stream') local ffi = require "ffi" local C = ffi.C local ffi_str = ffi.string local errmsg = base.get_errmsg_ptr() local FFI_OK = base.FFI_OK local FFI_ERROR = base.FFI_ERROR local int_out = ffi.new("int[1]") local get_request = base.get_request local get_string_buf = base.get_string_buf local get_size_ptr = base.get_size_ptr local error = error local type = type local tonumber = tonumber local max = math.max local subsystem = ngx.config.subsystem local ngx_lua_ffi_balancer_set_current_peer local ngx_lua_ffi_balancer_enable_keepalive local ngx_lua_ffi_balancer_set_more_tries local ngx_lua_ffi_balancer_get_last_failure local ngx_lua_ffi_balancer_set_timeouts -- used by both stream and http local ngx_lua_ffi_balancer_set_upstream_tls local ngx_lua_ffi_balancer_bind_to_local_addr if subsystem == 'http' then ffi.cdef[[ int ngx_http_lua_ffi_balancer_set_current_peer(ngx_http_request_t *r, const unsigned char *addr, size_t addr_len, int port, const unsigned char *host, ssize_t host_len, char **err); int ngx_http_lua_ffi_balancer_enable_keepalive(ngx_http_request_t *r, unsigned long timeout, unsigned int max_requests, char **err); int ngx_http_lua_ffi_balancer_set_more_tries(ngx_http_request_t *r, int count, char **err); int ngx_http_lua_ffi_balancer_get_last_failure(ngx_http_request_t *r, int *status, char **err); int ngx_http_lua_ffi_balancer_set_timeouts(ngx_http_request_t *r, long connect_timeout, long send_timeout, long read_timeout, char **err); int ngx_http_lua_ffi_balancer_recreate_request(ngx_http_request_t *r, char **err); int ngx_http_lua_ffi_balancer_set_upstream_tls(ngx_http_request_t *r, int on, char **err); int ngx_http_lua_ffi_balancer_bind_to_local_addr(ngx_http_request_t *r, const u_char *addr, size_t addr_len, u_char *errbuf, size_t *errbuf_size); ]] ngx_lua_ffi_balancer_set_current_peer = C.ngx_http_lua_ffi_balancer_set_current_peer ngx_lua_ffi_balancer_enable_keepalive = C.ngx_http_lua_ffi_balancer_enable_keepalive ngx_lua_ffi_balancer_set_more_tries = C.ngx_http_lua_ffi_balancer_set_more_tries ngx_lua_ffi_balancer_get_last_failure = C.ngx_http_lua_ffi_balancer_get_last_failure ngx_lua_ffi_balancer_set_timeouts = C.ngx_http_lua_ffi_balancer_set_timeouts ngx_lua_ffi_balancer_set_upstream_tls = C.ngx_http_lua_ffi_balancer_set_upstream_tls ngx_lua_ffi_balancer_bind_to_local_addr = C.ngx_http_lua_ffi_balancer_bind_to_local_addr elseif subsystem == 'stream' then ffi.cdef[[ int ngx_stream_lua_ffi_balancer_set_current_peer( ngx_stream_lua_request_t *r, const unsigned char *addr, size_t addr_len, int port, char **err); int ngx_stream_lua_ffi_balancer_set_more_tries(ngx_stream_lua_request_t *r, int count, char **err); int ngx_stream_lua_ffi_balancer_get_last_failure( ngx_stream_lua_request_t *r, int *status, char **err); int ngx_stream_lua_ffi_balancer_set_timeouts(ngx_stream_lua_request_t *r, long connect_timeout, long timeout, char **err); int ngx_stream_lua_ffi_balancer_bind_to_local_addr( ngx_stream_lua_request_t *r, const char *addr, size_t addr_len, char *errbuf, size_t *errbuf_size); ]] ngx_lua_ffi_balancer_set_current_peer = C.ngx_stream_lua_ffi_balancer_set_current_peer ngx_lua_ffi_balancer_set_more_tries = C.ngx_stream_lua_ffi_balancer_set_more_tries ngx_lua_ffi_balancer_get_last_failure = C.ngx_stream_lua_ffi_balancer_get_last_failure local ngx_stream_lua_ffi_balancer_set_timeouts = C.ngx_stream_lua_ffi_balancer_set_timeouts ngx_lua_ffi_balancer_set_timeouts = function(r, connect_timeout, send_timeout, read_timeout, err) local timeout = max(send_timeout, read_timeout) return ngx_stream_lua_ffi_balancer_set_timeouts(r, connect_timeout, timeout, err) end ngx_lua_ffi_balancer_bind_to_local_addr = C.ngx_stream_lua_ffi_balancer_bind_to_local_addr else error("unknown subsystem: " .. subsystem) end local DEFAULT_KEEPALIVE_IDLE_TIMEOUT = 60000 local DEFAULT_KEEPALIVE_MAX_REQUESTS = 100 local peer_state_names = { [1] = "keepalive", [2] = "next", [4] = "failed", } local _M = { version = base.version } if subsystem == "http" then function _M.set_current_peer(addr, port, host) local r = get_request() if not r then error("no request found") end if not port then port = 0 elseif type(port) ~= "number" then port = tonumber(port) end if host ~= nil and type(host) ~= "string" then error("bad argument #3 to 'set_current_peer' " .. "(string expected, got " .. type(host) .. ")") end local rc = ngx_lua_ffi_balancer_set_current_peer(r, addr, #addr, port, host, host and #host or 0, errmsg) if rc == FFI_OK then return true end return nil, ffi_str(errmsg[0]) end else function _M.set_current_peer(addr, port, host) local r = get_request() if not r then error("no request found") end if not port then port = 0 elseif type(port) ~= "number" then port = tonumber(port) end if host ~= nil then error("bad argument #3 to 'set_current_peer' ('host' not yet " .. "implemented in " .. subsystem .. " subsystem)", 2) end local rc = ngx_lua_ffi_balancer_set_current_peer(r, addr, #addr, port, errmsg) if rc == FFI_OK then return true end return nil, ffi_str(errmsg[0]) end end if subsystem == "http" then function _M.enable_keepalive(idle_timeout, max_requests) local r = get_request() if not r then error("no request found") end if not idle_timeout then idle_timeout = DEFAULT_KEEPALIVE_IDLE_TIMEOUT elseif type(idle_timeout) ~= "number" then error("bad argument #1 to 'enable_keepalive' " .. "(number expected, got " .. type(idle_timeout) .. ")", 2) elseif idle_timeout < 0 then error("bad argument #1 to 'enable_keepalive' (expected >= 0)", 2) else idle_timeout = idle_timeout * 1000 end if not max_requests then max_requests = DEFAULT_KEEPALIVE_MAX_REQUESTS elseif type(max_requests) ~= "number" then error("bad argument #2 to 'enable_keepalive' " .. "(number expected, got " .. type(max_requests) .. ")", 2) elseif max_requests < 0 then error("bad argument #2 to 'enable_keepalive' (expected >= 0)", 2) end local rc = ngx_lua_ffi_balancer_enable_keepalive(r, idle_timeout, max_requests, errmsg) if rc == FFI_OK then return true end return nil, ffi_str(errmsg[0]) end else function _M.enable_keepalive() error("'enable_keepalive' not yet implemented in " .. subsystem .. " subsystem", 2) end end function _M.set_more_tries(count) local r = get_request() if not r then error("no request found") end local rc = ngx_lua_ffi_balancer_set_more_tries(r, count, errmsg) if rc == FFI_OK then if errmsg[0] == nil then return true end return true, ffi_str(errmsg[0]) -- return the warning end return nil, ffi_str(errmsg[0]) end function _M.get_last_failure() local r = get_request() if not r then error("no request found") end local state = ngx_lua_ffi_balancer_get_last_failure(r, int_out, errmsg) if state == 0 then return nil end if state == FFI_ERROR then return nil, nil, ffi_str(errmsg[0]) end return peer_state_names[state] or "unknown", int_out[0] end function _M.set_timeouts(connect_timeout, send_timeout, read_timeout) local r = get_request() if not r then error("no request found") end if not connect_timeout then connect_timeout = 0 elseif type(connect_timeout) ~= "number" or connect_timeout <= 0 then error("bad connect timeout", 2) else connect_timeout = connect_timeout * 1000 end if not send_timeout then send_timeout = 0 elseif type(send_timeout) ~= "number" or send_timeout <= 0 then error("bad send timeout", 2) else send_timeout = send_timeout * 1000 end if not read_timeout then read_timeout = 0 elseif type(read_timeout) ~= "number" or read_timeout <= 0 then error("bad read timeout", 2) else read_timeout = read_timeout * 1000 end local rc rc = ngx_lua_ffi_balancer_set_timeouts(r, connect_timeout, send_timeout, read_timeout, errmsg) if rc == FFI_OK then return true end return false, ffi_str(errmsg[0]) end if subsystem == 'http' then function _M.recreate_request() local r = get_request() if not r then error("no request found") end local rc = C.ngx_http_lua_ffi_balancer_recreate_request(r, errmsg) if rc == FFI_OK then return true end if errmsg[0] ~= nil then return nil, ffi_str(errmsg[0]) end return nil, "failed to recreate the upstream request" end function _M.set_upstream_tls(on) local r = get_request() if not r then return error("no request found") end local rc if on == 0 or on == false then on = 0 else on = 1 end rc = ngx_lua_ffi_balancer_set_upstream_tls(r, on, errmsg); if rc == FFI_OK then return true end return nil, ffi_str(errmsg[0]) end end function _M.bind_to_local_addr(addr) local r = get_request() if not r then error("no request found") end if type(addr) ~= "string" then error("bad argument #1 to 'bind_to_local_addr' " .. "(string expected, got " .. type(addr) .. ")") end local errbuf_size = 1024 local errbuf = get_string_buf(errbuf_size) local sizep = get_size_ptr() sizep[0] = errbuf_size local rc = ngx_lua_ffi_balancer_bind_to_local_addr(r, addr, #addr, errbuf, sizep) if rc == FFI_OK then return true end return nil, ffi_str(errbuf, sizep[0]) end return _M