1 files changed, 64 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/modules/prometheus/init.go b/src/go/collectors/go.d.plugin/modules/prometheus/init.go
new file mode 100644
index 000000000..f5cc8bca9
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/prometheus/init.go
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package prometheus
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/matcher"
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/prometheus"
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
+)
+
+func (p *Prometheus) validateConfig() error {
+	if p.URL == "" {
+		return errors.New("'url' can not be empty")
+	}
+	return nil
+}
+
+func (p *Prometheus) initPrometheusClient() (prometheus.Prometheus, error) {
+	httpClient, err := web.NewHTTPClient(p.Client)
+	if err != nil {
+		return nil, fmt.Errorf("init HTTP client: %v", err)
+	}
+
+	req := p.Request.Copy()
+	if p.BearerTokenFile != "" {
+		token, err := os.ReadFile(p.BearerTokenFile)
+		if err != nil {
+			return nil, fmt.Errorf("bearer token file: %v", err)
+		}
+		req.Headers["Authorization"] = "Bearer " + string(token)
+	}
+
+	sr, err := p.Selector.Parse()
+	if err != nil {
+		return nil, fmt.Errorf("parsing selector: %v", err)
+	}
+
+	if sr != nil {
+		return prometheus.NewWithSelector(httpClient, req, sr), nil
+	}
+	return prometheus.New(httpClient, req), nil
+}
+
+func (p *Prometheus) initFallbackTypeMatcher(expr []string) (matcher.Matcher, error) {
+	if len(expr) == 0 {
+		return nil, nil
+	}
+
+	m := matcher.FALSE()
+
+	for _, pattern := range expr {
+		v, err := matcher.NewGlobMatcher(pattern)
+		if err != nil {
+			return nil, fmt.Errorf("error on parsing pattern '%s': %v", pattern, err)
+		}
+		m = matcher.Or(m, v)
+	}
+
+	return m, nil
+}