String-Bearbeitung (msg.payload) in Node-Red

harryp · 6. Februar 2024 um 09:07

Hallo,

mal wieder ein Node-Red-Problem.

Ich habe die Integration des DWD in HA installiert um mich über Wetterwarnungen in meiner Umgebung/Stadt informieren zu lassen.
Wenn eine Wetterwarung kommt, schicke ich mir eine Benachrichtigung auf iPhone, das eine Warnung vorliegt.
Zum Beginn der Warnperiode (meist kommt die Warnung/Ankündigung früher) schicke ich mir den Text der Warnung per telegram aufs iPhone und zu ALEXA, die mir den Text dann ansagt.
So weit so gut.

Gestern kam folgender Text:

“Es liegt eine Wetterwarnung vor: Es treten Windböen mit Geschwindigkeiten zwischen 50km/h (14 m/s, 28 kn, Bft 7) und 60 km/h (17 m/s, 33 kn, Bft 7) anfangs aus wehster Richtung auf.”

Die Textpassage in den Klammern, würde ich gerne entfernen, bevor ich den Text verschicke. Gibt es eine Möglichkeit, aus einer msg.paload alles zwischen 2 Klammern zu entfernen, auch wenn die Klammer nicht immer an der selben Stelle steht und unterschiedlich lang ist?

noschvie · 6. Februar 2024 um 10:01

Welches Feld verwendest du bzw. von welchem Feld der API kommt der Text? warning__headline oder description?

harryp · 6. Februar 2024 um 10:05

Den hier:

msg.data.attributes.warning_1_description

Alles, wie hier erklärt:

mickym · 6. Februar 2024 um 10:31

bitte sehr

[{"id":"bc1430f835c93119","type":"change","z":"7e6af0015415146d","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"\\(.*?\\)","fromt":"re","to":"","tot":"str"},{"t":"set","p":"payload","pt":"msg","to":"$trim(payload)\t","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":470,"y":5860,"wires":[["f056e363494a7401"]]}]

Nachtrag: Flow geändert mit

$trim(payload)

um überflüssige Leerzeichen zu entfernen.

Für alle die es nicht importieren wollen - hier die Lösung als Bild:

harryp · 6. Februar 2024 um 10:38

Du bist mein Held!

Gibt es für die Logik der 1. Regel irgendwo eine Anleitung oder eine Beschreibung, wo man solche Regeln/Funktionen nachlesen kann?

mickym · 6. Februar 2024 um 10:41

Grundsätzlich kannst Du sehr vieles über reguläre Ausdrücke lösen. Ich empfehle Dir diese Seite, da sie sowohl erklärt - aber Du kannst dort auch üben. Ich hoffe dich stört das Englisch nicht.

mickym · 6. Februar 2024 um 10:56

Ach manchmal nähere ich mich erst der elegantesten Lösung. Man kann das ganze natürlich auch mit einer Regel machen:

$trim($replace(payload, /\(.*?\)/, ''))

harryp · 6. Februar 2024 um 11:07

Und dabei ist es erst Mittag!

BTW:
Da fällt mir noch eine zweite Frage bzgl. DWD ein:

Der DWD liefert ja für die verschiedenen Warnstufen unterschiedliche Informationen und kennzeichnen das auf der HP mit :

jetzt könnte ich natürlich für die unterschiedlichen Warnstufen (1-4)

4x den gleichen flow bauen und nur die Variable der Entität:

msg.data.attributes.warning_x_description

von 1-4 ändern.

Aber das geht doch bestimmt einfacher in einem flow, mit einer Abfrage welche Stufe ausgelöst wurde. Nur wie bekomme ich die Zahl an die “x”-Position bei der Entität?

mickym · 6. Februar 2024 um 11:24

Na Du kannst entweder in einer switch Node nach den level verzweigen oder keine Ahnung was Du machst - abfragen, ob eine Eigenschaft existiert oder nicht.

Ich geh doch mal davon aus, dass die DWD Entität Dir in msg.data oder was weiß ich alle diese Felder liefert.

Du kannst doch dann in Deinem Flow direkt unterscheiden mit einer switch Node:

Falls das x durch 1, 2, etc. geändert wird - dann wertest Du halt Dein gesamtes attributes objekt aus.

harryp · 6. Februar 2024 um 11:48

Ja, das ist klar.
Ich kann mit einer “switch”-node abfragen, welche Stufe 1-4 oder keine = 0 ausgelöst wurde.
Momentan habe ich meinen flow für Stufe “1” aufgebaut, d.h. bei allen verwendeten Entitäten steht anstelle des “X” eine “1”, wie z.B.: hier:

msg.data.attributes.warning_1_description

Jetzt könnte ich hier der “switch”-node 4 parallele flows anordnen und einfach nur die “1” durch “2-4” ersetzen.
Meine Frage war, ob das nicht einfacher geht, d.h. ich kann in den entsprechenden nodes jeweils die Zahl der jeweiligen Stufe setzten und habe damit nur einen flow und nicht 4 parallele.

mickym · 6. Februar 2024 um 12:05

So hier meine Lösung:

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Heute abend kann ich dann noch die 0 vielleicht ausschliessen - mal schauen.

harryp · 6. Februar 2024 um 12:31

Ich hab’s hinbekommen.
Musste einfach die “switch”-node erweitern und die Meldungsaufbereitung auf
4 Varianten erweitern.
Der obere Flow ist der neue, der untere war der alte.

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''))","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":1739.9999389648438,"y":1556.000018119812,"wires":[["010080c483544834"]]},{"id":"8e3d0fd006f1b6f9","type":"switch","z":"5e38a40b1ab38ea9","name":"Warnung","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"2","vt":"num"},{"t":"eq","v":"3","vt":"num"},{"t":"eq","v":"4","vt":"num"}],"checkall":"false","repair":false,"outputs":4,"x":1378,"y":1570,"wires":[["178bb5445060d660"],["3c4d607a6e971d16"],["4abd905a73757868"],["51bbf82bdf91cb54"]]},{"id":"1bc9613086394754","type":"switch","z":"5e38a40b1ab38ea9","name":"Warnung","property":"payload","propertyType":"msg","rules":[{"t":"gt","v":"0","vt":"num"}],"checkall":"false","repair":false,"outputs":1,"x":342,"y":1332,"wires":[["83abbd668e554cc6"]]},{"id":"a1aba8eb.bfd618","type":"server","name":"Home Assistant","version":5,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true,"cacheJson":true,"heartbeat":false,"heartbeatInterval":30,"areaSelector":"friendlyName","deviceSelector":"friendlyName","entitySelector":"friendlyName","statusSeparator":"at: ","statusYear":"hidden","statusMonth":"short","statusDay":"numeric","statusHourCycle":"h23","statusTimeFormat":"h:m","enableGlobalContextStore":true},{"id":"1dc2bfdd622bc8d9","type":"alexa-remote-account","name":"ALEXA","authMethod":"proxy","proxyOwnIp":"192.168.178.72","proxyPort":"3456","cookieFile":"/homeassistant/amazon.txt","refreshInterval":"3","alexaServiceHost":"layla.amazon.de","pushDispatchHost":"","amazonPage":"amazon.de","acceptLanguage":"de-DE","onKeywordInLanguage":"on","userAgent":"","autoInit":"on"}]

Damit kann ich erstmal gut leben. Muss zum vollständigen testen auf die nächste “echte” Wetterwarung warten.

mickym · 6. Februar 2024 um 21:43

So ich hab mal Deine Anforderungen angeschaut - und es geht Dir ja nur um die Warnmeldungen . Ich habe das jetzt alles in 2 Regeln gepackt - dann kannst Dir die Switch node und die function Nodes sparen.

Ich habe jetzt mit einem regulären Ausdruck einen Filter eingebaut.

Sprich mit Level 0 wird keine Warnung ausgegeben und in der 2. Regel wird keine Warnung - dann in “Keine Warnung” übersetzt.

Damit kannst Dir die switch und die ganzen funktion Nodes sparen und auch das Entferner der im Klammer stehenden Textes habe ich gleich mit übernommen. Das ist der blau markierte Teil - den kannst auch wieder weg nehmen, wenn Du das lieber in einer eigenen Change Node haben willst.

Hier mal zum Test und ggf. zur Verwendung:

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Nachtrag: Das mit dem Satz: Das ist eine Wetterwarnung ist ggf. doppelt gemoppelt. Ich dachte nur - ich hätte gesehen, dass das in der function Node hinzugefügt wurde.

Falls das in der original Meldung bereits drin ist, dann halt die 2. Regel ändern.