Satisfy linters

backend/couchdb/auth.go

@@ -14,8 +14,8 @@ func (l *AuthTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	return l.transport.RoundTrip(req)
 }
 
-func (rt *AuthTransport) Transport() http.RoundTripper {
-	return rt.transport
+func (l *AuthTransport) Transport() http.RoundTripper {
+	return l.transport
 }
 
 func (l *AuthTransport) SetTransport(rt http.RoundTripper) {

backend/couchdb/db.go

@@ -64,6 +64,7 @@ func clientAndDB(ctx context.Context, dbName string, cfg *Config) (*kivik.Client
 	if db.Err() != nil {
 		return nil, nil, db.Err()
 	}
+
 	return client, db, err
 }
 
@@ -74,6 +75,7 @@ func Client(cfg *Config) (*kivik.Client, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	rts := []transport.ChainableRoundTripper{
 		&AuthTransport{
 			Username: cfg.User,
@@ -84,10 +86,11 @@ func Client(cfg *Config) (*kivik.Client, error) {
 	if !cfg.DisableRequestLogging {
 		rts = append(rts, &transport.LoggingRoundTripper{})
 	}
+
 	chain := transport.Chain(rts...)
 	tr := couchdb.SetTransport(chain)
-	err = client.Authenticate(ctx, tr)
-	if err != nil {
+
+	if err := client.Authenticate(ctx, tr); err != nil {
 		return nil, err
 	}
 
@@ -96,9 +99,10 @@ func Client(cfg *Config) (*kivik.Client, error) {
 
 func ParseConfig() (*Config, error) {
 	var cfg Config
-	err := env.Parse(&cfg)
-	if err != nil {
+
+	if err := env.Parse(&cfg); err != nil {
 		return nil, err
 	}
+
 	return &cfg, nil
 }

backend/couchdb/health_check.go

@@ -7,7 +7,9 @@ import (
 	"time"
 
 	kivik "github.com/go-kivik/kivik/v3"
+
 	"github.com/pace/bricks/maintenance/health/servicehealthcheck"
+	"github.com/pace/bricks/maintenance/log"
 )
 
 // HealthCheck checks the state of the object storage client. It must not be changed
@@ -28,7 +30,7 @@ var (
 
 // HealthCheck checks if the object storage client is healthy. If the last result is outdated,
 // object storage is checked for upload and download,
-// otherwise returns the old result
+// otherwise returns the old result.
 func (h *HealthCheck) HealthCheck(ctx context.Context) servicehealthcheck.HealthCheckResult {
 	if time.Since(h.state.LastChecked()) <= h.Config.HealthCheckResultTTL {
 		// the last health check is not outdated, an can be reused.
@@ -38,14 +40,16 @@ func (h *HealthCheck) HealthCheck(ctx context.Context) servicehealthcheck.Health
 	checkTime := time.Now()
 
 	var doc Doc
+
 	var err error
+
 	var row *kivik.Row
 
 check:
 	// check if context was canceled
 	select {
 	case <-ctx.Done():
-		h.state.SetErrorState(fmt.Errorf("failed: %v", ctx.Err()))
+		h.state.SetErrorState(fmt.Errorf("failed: %w", ctx.Err()))
 		return h.state.GetState()
 	default:
 	}
@@ -55,16 +59,22 @@ check:
 		if kivik.StatusCode(row.Err) == http.StatusNotFound {
 			goto put
 		}
-		h.state.SetErrorState(fmt.Errorf("failed to get: %#v", row.Err))
+
+		h.state.SetErrorState(fmt.Errorf("failed to get: %w", row.Err))
+
 		return h.state.GetState()
 	}
-	defer row.Body.Close()
+
+	defer func() {
+		if err := row.Body.Close(); err != nil {
+			log.Ctx(ctx).Debug().Err(err).Msg("Failed closing body")
+		}
+	}()
 
 	// check if document exists
 	if row.Rev != "" {
-		err = row.ScanDoc(&doc)
-		if err != nil {
-			h.state.SetErrorState(fmt.Errorf("failed to get: %v", row.Err))
+		if err := row.ScanDoc(&doc); err != nil {
+			h.state.SetErrorState(fmt.Errorf("failed to get: %w", row.Err))
 			return h.state.GetState()
 		}
 
@@ -77,23 +87,27 @@ check:
 put:
 	// update document
 	doc.ID = h.Config.HealthCheckKey
+
 	doc.Time = time.Now().Format(healthCheckTimeFormat)
+
 	_, err = h.DB.Put(ctx, h.Config.HealthCheckKey, doc)
 	if err != nil {
 		// not yet created, try to create
 		if h.Config.DatabaseAutoCreate && kivik.StatusCode(err) == http.StatusNotFound {
-			err := h.Client.CreateDB(ctx, h.Name)
-			if err != nil {
-				h.state.SetErrorState(fmt.Errorf("failed to put object: %v", err))
+			if err := h.Client.CreateDB(ctx, h.Name); err != nil {
+				h.state.SetErrorState(fmt.Errorf("failed to put object: %w", err))
 				return h.state.GetState()
 			}
+
 			goto put
 		}
 
 		if kivik.StatusCode(err) == http.StatusConflict {
 			goto check
 		}
-		h.state.SetErrorState(fmt.Errorf("failed to put object: %v", err))
+
+		h.state.SetErrorState(fmt.Errorf("failed to put object: %w", err))
+
 		return h.state.GetState()
 	}
 
@@ -103,6 +117,7 @@ put:
 healthy:
 	// If uploading and downloading worked set the Health Check to healthy
 	h.state.SetHealthy()
+
 	return h.state.GetState()
 }
 
@@ -116,15 +131,15 @@ type Doc struct {
 // time span concurrent request to the objstore may break the assumption
 // that the value is the same, but in this case it would be acceptable.
 // Assumption all instances are created equal and one providing evidence
-// of a good write would be sufficient. See #244
+// of a good write would be sufficient. See #244.
 func wasConcurrentHealthCheck(checkTime time.Time, observedValue string) bool {
 	t, err := time.Parse(healthCheckTimeFormat, observedValue)
 	if err == nil {
 		allowedStart := checkTime.Add(-healthCheckConcurrentSpan)
 		allowedEnd := checkTime.Add(healthCheckConcurrentSpan)
 
 		// timestamp we got from the document is in allowed range
-		// concider it healthy
+		// consider it healthy
 		return t.After(allowedStart) && t.Before(allowedEnd)
 	}
 

backend/k8sapi/client.go

@@ -15,76 +15,84 @@ import (
 	"strings"
 
 	"github.com/caarlos0/env/v10"
+
 	"github.com/pace/bricks/http/transport"
 	"github.com/pace/bricks/maintenance/log"
 )
 
-// Client minimal client for the kubernetes API
+// Client minimal client for the kubernetes API.
 type Client struct {
 	Podname    string
 	Namespace  string
 	CACert     []byte
 	Token      string
 	cfg        Config
-	HttpClient *http.Client
+	HTTPClient *http.Client
 }
 
-// NewClient create new api client
+// NewClient create new api client.
 func NewClient() (*Client, error) {
 	cl := Client{
-		HttpClient: &http.Client{},
+		HTTPClient: &http.Client{},
 	}
 
 	// lookup hostname (for pod update)
 	hostname, err := os.Hostname()
 	if err != nil {
 		return nil, err
 	}
+
 	cl.Podname = hostname
 
 	// parse environment including secrets mounted by kubernetes
-	err = env.Parse(&cl.cfg)
-	if err != nil {
+	if err := env.Parse(&cl.cfg); err != nil {
 		return nil, err
 	}
 
 	caData, err := os.ReadFile(cl.cfg.CACertFile)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read %q: %v", cl.cfg.CACertFile, err)
+		return nil, fmt.Errorf("failed to read %q: %w", cl.cfg.CACertFile, err)
 	}
+
 	cl.CACert = []byte(strings.TrimSpace(string(caData)))
 
 	namespaceData, err := os.ReadFile(cl.cfg.NamespaceFile)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read %q: %v", cl.cfg.NamespaceFile, err)
+		return nil, fmt.Errorf("failed to read %q: %w", cl.cfg.NamespaceFile, err)
 	}
+
 	cl.Namespace = strings.TrimSpace(string(namespaceData))
 
 	tokenData, err := os.ReadFile(cl.cfg.TokenFile)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read %q: %v", cl.cfg.CACertFile, err)
+		return nil, fmt.Errorf("failed to read %q: %w", cl.cfg.CACertFile, err)
 	}
+
 	cl.Token = strings.TrimSpace(string(tokenData))
 
 	// add kubernetes api server cert
 	chain := transport.NewDefaultTransportChain()
 	pool := x509.NewCertPool()
+
 	ok := pool.AppendCertsFromPEM(cl.CACert)
 	if !ok {
 		return nil, fmt.Errorf("failed to load kubernetes ca cert")
 	}
+
 	chain.Final(&http.Transport{
 		TLSClientConfig: &tls.Config{
-			RootCAs: pool,
+			RootCAs:    pool,
+			MinVersion: tls.VersionTLS12,
 		},
 	})
-	cl.HttpClient.Transport = chain
+
+	cl.HTTPClient.Transport = chain
 
 	return &cl, nil
 }
 
 // SimpleRequest send a simple http request to kubernetes with the passed
-// method, url and requestObj, decoding the result into responseObj
+// method, url and requestObj, decoding the result into responseObj.
 func (c *Client) SimpleRequest(ctx context.Context, method, url string, requestObj, responseObj interface{}) error {
 	data, err := json.Marshal(requestObj)
 	if err != nil {
@@ -99,16 +107,22 @@ func (c *Client) SimpleRequest(ctx context.Context, method, url string, requestO
 	req.Header.Set("Content-Type", "application/json-patch+json")
 	req.Header.Set("Authorization", "Bearer "+c.Token)
 
-	resp, err := c.HttpClient.Do(req)
+	resp, err := c.HTTPClient.Do(req)
 	if err != nil {
 		log.Ctx(ctx).Debug().Err(err).Msg("failed to do api request")
 		return err
 	}
-	defer resp.Body.Close()
+
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			log.Ctx(ctx).Debug().Err(err).Msg("failed to close response body")
+		}
+	}()
 
 	if resp.StatusCode > 299 {
-		body, _ := io.ReadAll(resp.Body) // nolint: errcheck
+		body, _ := io.ReadAll(resp.Body)
 		log.Ctx(ctx).Debug().Msgf("failed to do api request, due to: %s", string(body))
+
 		return fmt.Errorf("k8s request failed with %s", resp.Status)
 	}
 

backend/k8sapi/config.go

@@ -3,7 +3,7 @@
 package k8sapi
 
 // Config gathers the required kubernetes system configuration to use the
-// kubernetes API
+// kubernetes API.
 type Config struct {
 	Host          string `env:"KUBERNETES_SERVICE_HOST" envDefault:"localhost"`
 	Port          int    `env:"KUBERNETES_PORT_443_TCP_PORT" envDefault:"433"`

backend/k8sapi/pod.go

@@ -9,13 +9,13 @@ import (
 )
 
 // SetCurrentPodLabel set the label for the current pod in the current
-// namespace (requires patch on pods resource)
+// namespace (requires patch on pods resource).
 func (c *Client) SetCurrentPodLabel(ctx context.Context, label, value string) error {
 	return c.SetPodLabel(ctx, c.Namespace, c.Podname, label, value)
 }
 
 // SetPodLabel sets the label and value for the pod of the given namespace
-// (requires patch on pods resource in the given namespace)
+// (requires patch on pods resource in the given namespace).
 func (c *Client) SetPodLabel(ctx context.Context, namespace, podname, label, value string) error {
 	pr := []struct {
 		Op    string `json:"op"`
@@ -30,6 +30,7 @@ func (c *Client) SetPodLabel(ctx context.Context, namespace, podname, label, val
 	}
 	url := fmt.Sprintf("https://%s:%d/api/v1/namespaces/%s/pods/%s",
 		c.cfg.Host, c.cfg.Port, namespace, podname)
+
 	var resp interface{}
 
 	return c.SimpleRequest(ctx, http.MethodPatch, url, &pr, &resp)