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{%
'use strict';
import * as fs from "fs";
import { connect } from "ubus";
import { cursor } from "uci";
function debug(...s) {
if (global.debug)
warn("DEBUG: ", ...s, "\n");
}
function puts(...s) {
return uhttpd.send(...s, "\n");
}
function govalue(value) {
if (value == Infinity)
return "+Inf";
else if (value == -Infinity)
return "-Inf";
else if (value != value)
return "NaN";
else if (type(value) in [ "int", "double" ])
return value;
else if (type(value) in [ "bool", "string" ])
return +value;
return null;
}
function metric(name, mtype, help, skipdecl) {
let func;
let decl = skipdecl == true ? false : true;
let yield = function(labels, value) {
let v = govalue(value);
if (v == null) {
debug(`skipping metric: unsupported value '${value}' (${name})`);
return func;
}
let labels_str = "";
if (length(labels)) {
let sep = "";
let s;
labels_str = "{";
for (let l in labels) {
if (labels[l] == null)
s = "";
else if (type(labels[l]) == "string") {
s = labels[l];
s = replace(labels[l], "\\", "\\\\");
s = replace(s, "\"", "\\\"");
s = replace(s, "\n", "\\n");
} else {
s = govalue(labels[l]);
if (!s)
continue;
}
labels_str += sep + l + "=\"" + s + "\"";
sep = ",";
}
labels_str += "}";
}
if (decl) {
if (help)
puts("# HELP ", name, " ", help);
puts("# TYPE ", name, " ", mtype);
decl = false;
}
puts(name, labels_str, " ", v);
return func;
};
func = yield;
return func;
}
function counter(name, help, skipdecl) {
return metric(name, "counter", help, skipdecl);
}
function gauge(name, help, skipdecl) {
return metric(name, "gauge", help, skipdecl);
}
function httpstatus(status) {
puts("Status: ", status, "\nContent-Type: text/plain; version=0.0.4; charset=utf-8\n");
}
function clockdiff(t1, t2) {
return (t2[0] - t1[0]) * 1000000000 + t2[1] - t1[1];
}
let collectors = {};
global.handle_request = function(env) {
let scope = {
config: null,
fs,
ubus: connect(),
counter,
gauge,
wsplit: function(line) {
return split(line, /\s+/);
},
nextline: function(f) {
return rtrim(f.read("line"), "\n");
},
oneline: function(fn) {
let f = fs.open(fn);
if (!f)
return null;
return nextline(f);
},
poneline: function(cmd) {
let f = fs.popen(cmd);
if (!f)
return null;
return nextline(f);
},
};
if (length(collectors) < 1) {
httpstatus("404 No Collectors found");
return;
}
let cols = [];
for (let q in split(env.QUERY_STRING, "&")) {
let s = split(q, "=", 2);
if (length(s) == 2 && s[0] == "collect") {
if (!(s[1] in collectors)) {
httpstatus(`404 Collector ${s[1]} not found`);
return;
}
push(cols, s[1]);
}
}
if (length(cols) > 0)
cols = uniq(cols);
else
cols = keys(collectors);
httpstatus("200 OK");
let duration = gauge("node_scrape_collector_duration_seconds");
let success = gauge("node_scrape_collector_success");
for (let col in cols) {
let ok = false;
let t1, t2;
scope["config"] = collectors[col].config;
t1 = clock(true);
try {
ok = call(collectors[col].func, null, scope) != false;
} catch(e) {
warn(`error running collector '${col}':\n${e.message}\n`);
}
t2 = clock(true);
duration({ collector: col }, clockdiff(t1, t2) / 1000000000.0);
success({ collector: col }, ok);
}
};
const lib = "/usr/share/ucode/node-exporter/lib";
const opts = {
strict_declarations: true,
raw_mode: true,
};
let cols = fs.lsdir(lib, "*.uc");
for (let col in cols) {
let func;
let uci = cursor();
try {
func = loadfile(lib + "/" + col, opts);
} catch(e) {
warn(`error compiling collector '${col}':\n${e.message}\n`);
continue;
}
let name = substr(col, 0, -3);
let config = uci.get_all("prometheus-node-exporter-ucode", name);
if (!config || config[".type"] != "collector")
config = {};
else {
delete config[".anonymous"];
delete config[".type"];
delete config[".name"];
}
collectors[name] = {
func,
config,
};
}
warn(`prometheus-node-exporter-ucode now serving requests with ${length(collectors)} collectors\n`);
if (!("uhttpd" in global)) {
global.debug = true;
puts = function(...s) {
return print(...s, "\n");
};
handle_request({
QUERY_STRING: join("&", map(ARGV, v => "collect=" + v)),
});
}
%}
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