set job scraping limit to 20 jobs

scraper.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/aws/aws-lambda-go/lambda"
 	"github.com/gocolly/colly"
@@ -29,6 +30,13 @@ type skills struct {
 	Typescript bool `json:"typescript"`
 }
 
+var (
+	jobs      []job
+	lastFetch time.Time
+	cacheTTL  = time.Minute * 5
+	jobLimit  = 20
+)
+
 func skillChecker(description string) skills {
 	return skills{
 		React:      strings.Contains(description, "React"),
@@ -40,13 +48,9 @@ func skillChecker(description string) skills {
 	}
 }
 
-// Slice to store job details
-var jobs []job
-
-func handler(ctx context.Context) ([]job, error) {
+func fetchData() error {
 
 	baseUrl := "https://thehub.io"
-	searchString := "https://thehub.io/jobs?roles=frontenddeveloper&roles=fullstackdeveloper&roles=backenddeveloper&roles=devops&paid=true&countryCode=DK&sorting=newJobs"
 	// Instantiate default collector
 	c := colly.NewCollector(
 		// visit only the hub
@@ -60,8 +64,16 @@ func handler(ctx context.Context) ([]job, error) {
 	excluded := []string{"senior", "lead"}
 	// Instantiate a new collector to visit the job details page
 	detailsCollector := c.Clone()
+
+	// Limit the number of jobs to fetch
+	jobCount := 0
+
 	// On every <div> element with class "card__content attribute call callback
 	c.OnHTML("div[class=card__content]", func(e *colly.HTMLElement) {
+		// Return if the job limit has been reached
+		if jobCount >= jobLimit {
+			return
+		}
 		// Get the title and ensure it doesn't contain any excluded words
 		title := e.ChildText("span.card-job-find-list__position")
 		for _, excludedWord := range excluded {
@@ -80,6 +92,9 @@ func handler(ctx context.Context) ([]job, error) {
 	})
 
 	detailsCollector.OnHTML("div.view-job-details", func(e *colly.HTMLElement) {
+		if jobCount >= jobLimit {
+			return
+		}
 		// Get logo and trim the url
 
 		logo := e.ChildAttr("div.media-item__image", "style")
@@ -99,6 +114,7 @@ func handler(ctx context.Context) ([]job, error) {
 			Skills:      skillChecker(e.ChildText("content.text-block__content > span")),
 		}
 		jobs = append(jobs, jobDetails)
+		jobCount++
 	})
 	// Handle pagination
 	c.OnHTML("a.page-link", func(e *colly.HTMLElement) {
@@ -109,8 +125,29 @@ func handler(ctx context.Context) ([]job, error) {
 			e.Request.Visit(fullNextPage)
 		}
 	})
+	// Visit the initial URL to start scraping
+	err := c.Visit("https://thehub.io/jobs?roles=frontenddeveloper&roles=fullstackdeveloper&roles=backenddeveloper&search=developer&paid=true&countryCode=DK&sorting=newJobs")
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func handler(ctx context.Context) ([]job, error) {
+	// Check if cache is valid
+	if time.Since(lastFetch) < cacheTTL && len(jobs) > 0 {
+		return jobs, nil
+	}
+
+	// Fetch new data
+	err := fetchData()
+	if err != nil {
+		return nil, err
+	}
+
+	// Update cache timestamp
+	lastFetch = time.Now()
 
-	c.Visit(searchString)
 	return jobs, nil
 }