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entrypointer.go
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/
entrypointer.go
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/*
Copyright 2022 The Tekton Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package spire
import (
"context"
"time"
"github.com/pkg/errors"
"github.com/spiffe/go-spiffe/v2/svid/x509svid"
"github.com/spiffe/go-spiffe/v2/workloadapi"
spireconfig "github.com/tektoncd/pipeline/pkg/spire/config"
)
// NewEntrypointerAPIClient creates the EntrypointerAPIClient
func NewEntrypointerAPIClient(c *spireconfig.SpireConfig) EntrypointerAPIClient {
return &spireEntrypointerAPIClient{
config: c,
}
}
type spireEntrypointerAPIClient struct {
config *spireconfig.SpireConfig
client *workloadapi.Client
}
func (w *spireEntrypointerAPIClient) setupClient(ctx context.Context) error {
if w.config == nil {
return errors.New("config has not been set yet")
}
if w.client == nil {
return w.dial(ctx)
}
return nil
}
func (w *spireEntrypointerAPIClient) dial(ctx context.Context) error {
// spire workloadapi client for entrypoint - https://github.com/spiffe/go-spiffe/blob/main/v2/workloadapi/client.go
client, err := workloadapi.New(ctx, workloadapi.WithAddr(w.config.SocketPath))
if err != nil {
return errors.Wrap(err, "spire workload API not initialized due to error")
}
w.client = client
return nil
}
// package-level timeout and backoff enable shortened timeout for unit tests
var (
timeout = 20 * time.Second
backoff = 2 * time.Second
)
func (w *spireEntrypointerAPIClient) getWorkloadSVID(ctx context.Context) (*x509svid.SVID, error) {
// Should this be using exponential backoff? IDK enough about the underlying
// implementation to know if exponential backoff is in fact justified, so
// when I modified this code to use a ticker I didn't change the backoff
// logic.
ticker := time.NewTicker(backoff)
defer ticker.Stop()
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
for {
var xsvid *x509svid.SVID
var err error
if xsvid, err = w.client.FetchX509SVID(ctx); err == nil { // No err -- return immediately on success
return xsvid, nil
}
select {
case <-ticker.C:
// do nothing; loop will try again
case <-ctx.Done():
// ctx timed out or was cancelled
return nil, errors.Wrap(ctx.Err(), errors.Wrap(err, "failed to fetch SVID").Error())
}
}
}
func (w *spireEntrypointerAPIClient) Close() error {
if w.client != nil {
return w.client.Close()
}
return nil
}