nim_nordnet_api
Okay, not really an API. Actually not even close to an API. Nordnet wasn't gonna play with me, so this ended up as an oldschool scraper.
The originale purpose to develop a sensor for https://www.home-assistant.io/
What is Nordnet
Nordnet is an online stockbroker with customers in Denmark, Norway, Sweden, and Finland. It serves stock from around the world. Checkout their website www.nordnet.dk and start trading with a low fee and an excellent UI.
What is this?
Well, this is a simple scraper. You provide the URL to the stock, and this little Nim program provide you with the latest data on the stock.
You can use this library in 3 ways:
- Normal library, either by cloning the repo or installing with Nimble
- CLI tool which outputs the data to the console
- Home Assistant "plugin" to serve data to your dashboard
What not to do
You should absolutely not set the scraping interval to low (!!). This is not an API provided by Nordnet, so please use.
What's next?
Nothing. Nordnet properly changes their div-structure on monday, and then the scraping is failing.
How to use it
For all the 3 methods, you have to provide the URL to stock page. Navigate to the site, e.g. for Novo:
https://www.nordnet.dk/markedet/aktiekurser/16256554-novo-nordisk-b
Now grab the last part of the url, which is what you need:
16256554-novo-nordisk-b
You can provide multiple URLs, so repeat the above until satisfied.
Normal library
import nordnet
let nnObject = nordnetData("Novo", "16256554-novo-nordisk-b")
echo nnObject.priceLatest # The price
echo nordnetJson(nnObject) # JsonNode
CLI
Just find the url path and run:
$ nim c -d:ssl -d:release nordnet.nim
$ ./nordnet 16256554-novo-nordisk-b
Home Assistant
The following is for implementing the data in https://www.home-assistant.io/.
Compile
First compile the file:
nim c -d:ssl -d:release nordnet.nim
Config file
Then edit the config file, config.json
, to your needs.
If you need to place your config file elsewhere, just edit the "config"
path. Otherwise leave blank.
nano config/config.json
Auto run
Now adjust the service file and deploy for autorun:
nano nordnet.service
sudo cp nordnet.service /etc/systemd/system/nordnet.service
sudo systemctl enable nordnet
sudo systemctl start nordnet
sudo systemctl status nordnet
Node red
We are making 3 nodes:
- MQTT-in node - convert to JSON object
- Switch node - prepared for more stocks
- HA entity node - make the sensor
Node red JSON code
[ { "id": "99ad52.619902b", "type": "mqtt in", "z": "f9f7e30c.acb0a", "name": "", "topic": "nordnet/#", "qos": "2", "datatype": "json", "broker": "6e85e811.77a988", "x": 160, "y": 460, "wires": [ [ "a55a5b7e.c1b6f8" ] ] }, { "id": "a55a5b7e.c1b6f8", "type": "switch", "z": "f9f7e30c.acb0a", "name": "Determine stock", "property": "topic", "propertyType": "msg", "rules": [ { "t": "eq", "v": "nordnet/Novo", "vt": "str" }, { "t": "eq", "v": "nordnet/Alibaba", "vt": "str" } ], "checkall": "false", "repair": false, "outputs": 2, "x": 360, "y": 460, "wires": [ [ "7ec6bbab.c507a4" ], [ "447985cf.024a3c" ] ] }, { "id": "7ec6bbab.c507a4", "type": "ha-entity", "z": "f9f7e30c.acb0a", "name": "Stock Novo", "server": "b95e3a52.453dc8", "version": 1, "debugenabled": true, "outputs": 1, "entityType": "sensor", "config": [ { "property": "name", "value": "nordnet_novo" }, { "property": "device_class", "value": "" }, { "property": "icon", "value": "" }, { "property": "unit_of_measurement", "value": "DKK" } ], "state": "payload.Novo.priceLatest", "stateType": "msg", "attributes": [ { "property": "percentToday", "value": "payload.Novo.percentToday", "valueType": "msg" }, { "property": "plusminusToday", "value": "payload.Novo.plusminusToday", "valueType": "msg" }, { "property": "priceBuy", "value": "payload.Novo.priceBuy", "valueType": "msg" }, { "property": "priceSell", "value": "payload.Novo.priceSell", "valueType": "msg" }, { "property": "priceHighest", "value": "payload.Novo.priceHighest", "valueType": "msg" }, { "property": "priceLowest", "value": "payload.Novo.priceLowest", "valueType": "msg" }, { "property": "tradeTotal", "value": "payload.Novo.tradeTotal", "valueType": "msg" }, { "property": "orderdepthBuy", "value": "payload.Novo.orderdepthBuy", "valueType": "msg" }, { "property": "orderdepthSell", "value": "payload.Novo.orderdepthSell", "valueType": "msg" }, { "property": "epochtime", "value": "payload.Novo.epochtime", "valueType": "msg" }, { "property": "success", "value": "payload.Novo.success", "valueType": "msg" } ], "resend": true, "outputLocation": "", "outputLocationType": "none", "inputOverride": "allow", "x": 590, "y": 420, "wires": [ [] ] }, { "id": "6a83e811.77a988", "type": "mqtt-broker", "z": "", "name": "Main MQTT", "broker": "127.0.0.1", "port": "1883", "clientid": "noderedmqtt", "usetls": false, "compatmode": false, "keepalive": "60", "cleansession": true, "birthTopic": "", "birthQos": "0", "birthPayload": "", "closeTopic": "", "closeQos": "0", "closePayload": "", "willTopic": "", "willQos": "0", "willPayload": "" }, { "id": "b93f3a12.453dc8", "type": "server", "z": "", "name": "Home Assistant", "legacy": false, "addon": true, "rejectUnauthorizedCerts": true, "ha_boolean": "y|yes|true|on|home|open", "connectionDelay": true, "cacheJson": true } ]Graph
Now just create a sensor-graph with the sensor sensor.nordnet_novo
, or use the
mini-graph with the following code:
type: 'custom:mini-graph-card'
name: 'Stock: Novo'
icon: 'mdi:chart-bell-curve'
entities:
- entity: sensor.nordnet_novo
name: Latest price
hours_to_show: 168
points_per_hour: 30
Types
MqttInfo* = object
MqttInfo* = object
host*: string
port*: int
username*: string
password*: string
topic*: string
ssl*: bool
clientname*: string
Nordnetapi* = object
Nordnetapi* = object
urls*: seq[string]
wait*: int
refresh*: int
Nordnet* = object
Nordnet* = object
success*: bool
name*: string
epochtime*: int
priceLatest*: float
priceBuy*: float
priceSell*: float
priceHighest*: float
priceLowest*: float
percentToday*: float
plusminusToday*: float
tradeTotal*: int
orderdepthSell*: int
orderdepthBuy*: int
Procs
nordnetConfig*
proc nordnetConfig*(configPath = "config/config.json") =
Load the config
nordnetData*
proc nordnetData*(name, url: string): Nordnet =
Scrape the data and return the Nordnet object
(success: true, name: "Novo", epochtime: 1584771256, priceLatest: 359.35, priceBuy: 359.35, priceSell: 359.35, priceHighest: 381.5, priceLowest: 355.75, percentToday: -1.55, plusminusToday: -5.65, tradeTotal: 6914045, orderdepthSell: 0, orderdepthBuy: 0)
nordnetJson*
proc nordnetJson*(nn: Nordnet): JsonNode =
Transform the Nordnet object to a JsonNode
{
"Novo": {
"priceLatest": 359.35,
"percentToday": -1.55,
"plusminusToday": -5.65,
"priceBuy": 359.35,
"priceSell": 359.35,
"priceHighest": 381.5,
"priceLowest": 355.75,
"tradeTotal": 6914045,
"orderdepthBuy": 0,
"orderdepthSell": 0,
"epochtime": 1584771256,
"success": true
}
}
apiRun*
proc apiRun*() {.async.} =
Run the async scraping. This will first load the config into memory, then connect to the mqtt broker, and then do the first scraping. After the first scraping the loading time will start.