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added first simple listener script
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@justdeko
justdeko committed Jul 17, 2021
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5 changes: 5 additions & 0 deletions mongo_event_listener/go.mod
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module function

go 1.16

require go.mongodb.org/mongo-driver v1.5.3
125 changes: 125 additions & 0 deletions mongo_event_listener/go.sum
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github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
59 changes: 59 additions & 0 deletions mongo_event_listener/listener.go
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package main

import (
"context"
"fmt"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"log"
"os"
)

type DocKey struct {
ID string `bson:"_id"`
}

type StreamEvent struct {
OperationType string `bson:"operationType"` // can be "insert", "update" or "delete"
FullDocument map[string]interface{} `bson:"fullDocument"`
DocumentKey DocKey `bson:"documentKey"`
}

func main() {
ctx := context.Background()
// check mongodb value
mongoUrl, present := os.LookupEnv("mongo_url")
if !present {
log.Println("MongoDB url not found, defaulting to namespace")
mongoUrl = "localhost:27017/?directConnection=true" // default mongodb location if no env passed
}
uri := fmt.Sprintf("mongodb://%s", mongoUrl)
log.Println(uri)
client, err := mongo.Connect(ctx, options.Client().ApplyURI(uri))
stopFatal(err)

opts := options.ChangeStream().SetFullDocument("updateLookup")
sensors := client.Database("syncmesh").Collection("sensor_data")
sensorStream, err := sensors.Watch(ctx, mongo.Pipeline{}, opts)
stopFatal(err)
defer func(sensorStream *mongo.ChangeStream, ctx context.Context) {
err := sensorStream.Close(ctx)
if err != nil {
log.Fatal(err)
}
}(sensorStream, ctx)

for sensorStream.Next(ctx) {
var data StreamEvent
err := sensorStream.Decode(&data)
stopFatal(err)
fmt.Printf("%v\n", data) // TODO: request after each change to syncmesh-fn
}
}

// logPanic is a fatal log if the error is not nil
func stopFatal(err error) {
if err != nil {
log.Fatal(err)
}
}

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