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latest.go
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latest.go
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package main
import (
"context"
"html/template"
"net/http"
"os"
"github.com/apex/log"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
)
func (s *server) latest() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// parse id from get request
id := r.URL.Query().Get("id")
log.WithField("id", id).Info("getting latest")
expr, err := expression.NewBuilder().WithKeyCondition(expression.Key("id").Equal(expression.Value(id))).Build()
if err != nil {
log.WithError(err).Fatal("couldn't build query expression")
}
records, err := s.client.Query(context.TODO(), &dynamodb.QueryInput{
KeyConditionExpression: expr.KeyCondition(),
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
TableName: aws.String(os.Getenv("TABLE_NAME")),
ScanIndexForward: aws.Bool(false),
Limit: aws.Int32(1),
})
if err != nil {
log.WithError(err).Fatal("couldn't get records")
}
var selection []Record
err = attributevalue.UnmarshalListOfMaps(records.Items, &selection)
if err != nil {
log.WithError(err).Fatal("couldn't parse records")
}
t, err := template.ParseFS(tmpl, "templates/*.html")
if err != nil {
log.WithError(err).Fatal("Failed to parse templates")
}
w.Header().Set("Content-Type", "text/html")
err = t.ExecuteTemplate(w, "index.html", struct {
Selection []Record
}{
selection,
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
log.WithError(err).Fatal("Failed to execute templates")
}
}
}