fix: configurable telegraf schema support

lib/handlers/influx_write.js

@@ -62,7 +62,9 @@ async function handler (req, res) {
     throw new errors.QrynBadRequest(e.toString())
   }
   const promises = []
-  if (streams) {
+  if (process.env.ADVANCED_TELEGRAF_METRICS_SCHEMA === 'telegraf-prometheus-v2') {
+    await Promise.all(telegrafPrometheusV1(streams))
+  } else if (streams) {
     streams.forEach(function (stream) {
       let JSONLabels = {}
       let JSONFields = {}
@@ -116,7 +118,7 @@ async function handler (req, res) {
           const values = [
             finger,
             BigInt(pad('0000000000000000000', timestamp, true)),
-            _value || 0,
+            parseFloat(_value) || 0,
             key || ''
           ]
           bulk.add([values])
@@ -139,6 +141,61 @@ async function handler (req, res) {
   return res.code(204).send('')
 }
 
+function telegrafPrometheusV1 (stream) {
+  const promises = []
+  for (const entry of stream) {
+    const timestamp = BigInt(entry.timestamp)
+    if (entry.measurement === 'syslog' || entry.fields.message) {
+      const labels = {
+        ...entry.tags,
+        measurement: entry.measurement
+      }
+      const strLabels = stringify(Object.fromEntries(Object.entries(labels).sort()))
+      const fp = fingerPrint(strLabels)
+      promises.push(bulk_labels.add([[
+        new Date().toISOString().split('T')[0],
+        fp,
+        strLabels,
+        entry.measurement || ''
+      ]]))
+      const values = [
+        fp,
+        timestamp,
+        0,
+        entry.fields.message || ''
+      ]
+      promises.push(bulk.add([values]))
+    }
+    for (const [key, value] of Object.entries(entry.fields)) {
+      const iValue = parseFloat(value)
+      if (typeof iValue !== 'number') {
+        continue
+      }
+      const labels = {
+        ...entry.tags,
+        measurement: entry.measurement,
+        __name__: key
+      }
+      const strLabels = stringify(Object.fromEntries(Object.entries(labels).sort()))
+      const fp = fingerPrint(strLabels)
+      promises.push(bulk_labels.add([[
+        new Date().toISOString().split('T')[0],
+        fp,
+        strLabels,
+        entry.measurement || ''
+      ]]))
+      const values = [
+        fp,
+        timestamp,
+        iValue || 0,
+        key || ''
+      ]
+      promises.push(bulk.add([values]))
+    }
+  }
+  return promises
+}
+
 function pad (pad, str, padLeft) {
   if (typeof str === 'undefined') {
     return pad