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move vault token watcher inside runner
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The runner is the external API and adding the clients to the parameters
breaks that 1 API. This moves the code to create the clients and start
the vault token watcher inside the runner which preserves the API while
still keeping the desired encapsulation.
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@eikenb
eikenb committed Sep 29, 2022
1 parent 201be0e commit 6334a1a
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Showing 8 changed files with 169 additions and 143 deletions.
19 changes: 2 additions & 17 deletions cli.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@ import (
"github.com/hashicorp/consul-template/service_os"
"github.com/hashicorp/consul-template/signals"
"github.com/hashicorp/consul-template/version"
"github.com/hashicorp/consul-template/watch"
)

// Exit codes are int values that represent an exit code for a particular error.
Expand Down Expand Up @@ -104,20 +103,8 @@ func (cli *CLI) Run(args []string) int {
return ExitCodeOK
}

// Create the clientset
clients, err := manager.NewClientSet(config)
if err != nil {
return logError(err, ExitCodeConfigError)
}

// vault token watcher
vtwatchErrCh := watch.VaultTokenWatcher(clients, config.Vault)
if err != nil {
return logError(err, ExitCodeRunnerError)
}

// Initial runner
runner, err := manager.NewRunner(clients, config, dry)
runner, err := manager.NewRunner(config, dry)
if err != nil {
return logError(err, ExitCodeRunnerError)
}
Expand All @@ -128,8 +115,6 @@ func (cli *CLI) Run(args []string) int {

for {
select {
case err := <-vtwatchErrCh:
return logError(err, ExitCodeRunnerError)
case err := <-runner.ErrCh:
// Check if the runner's error returned a specific exit status, and return
// that value. If no value was given, return a generic exit status.
Expand Down Expand Up @@ -165,7 +150,7 @@ func (cli *CLI) Run(args []string) int {
return logError(err, ExitCodeConfigError)
}

runner, err = manager.NewRunner(clients, config, dry)
runner, err = manager.NewRunner(config, dry)
if err != nil {
return logError(err, ExitCodeRunnerError)
}
Expand Down
35 changes: 29 additions & 6 deletions manager/runner.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,8 @@ type Runner struct {
// dependenciesLock is a lock around touching the dependencies map.
dependenciesLock sync.Mutex

// token watcher
vaultTokenWatcher *watch.Watcher
// watcher is the watcher this runner is using.
watcher *watch.Watcher

Expand Down Expand Up @@ -172,7 +174,7 @@ type RenderEvent struct {

// NewRunner accepts a slice of TemplateConfigs and returns a pointer to the new
// Runner and any error that occurred during creation.
func NewRunner(clients *dep.ClientSet, config *config.Config, dry bool) (*Runner, error) {
func NewRunner(config *config.Config, dry bool) (*Runner, error) {
log.Printf("[INFO] (runner) creating new runner (dry: %v, once: %v)",
dry, config.Once)

Expand All @@ -181,10 +183,21 @@ func NewRunner(clients *dep.ClientSet, config *config.Config, dry bool) (*Runner
dry: dry,
}

if err := runner.init(clients); err != nil {
// Create the clientset
clients, err := NewClientSet(config)
if err != nil {
return nil, fmt.Errorf("runner: %w", err)
}
// needs to be run early to do initial token handling
runner.vaultTokenWatcher, err = watch.VaultTokenWatcher(
clients, config.Vault, runner.DoneCh)
if err != nil {
return nil, err
}

if err := runner.init(clients); err != nil {
return nil, err
}
return runner, nil
}

Expand Down Expand Up @@ -226,7 +239,7 @@ func (r *Runner) Start() {

if r.child != nil {
r.stopDedup()
r.stopWatcher()
r.stopWatchers()

log.Printf("[INFO] (runner) waiting for child process to exit")
select {
Expand Down Expand Up @@ -330,7 +343,7 @@ func (r *Runner) Start() {

if r.child != nil {
r.stopDedup()
r.stopWatcher()
r.stopWatchers()

log.Printf("[INFO] (runner) waiting for child process to exit")
select {
Expand Down Expand Up @@ -384,6 +397,12 @@ func (r *Runner) Start() {
r.ErrCh <- err
return

case err := <-r.vaultTokenWatcher.ErrCh():
// Push the error back up the stack
log.Printf("[ERR] (runner): %s", err)
r.ErrCh <- err
return

case tmpl := <-r.quiescenceCh:
// Remove the quiescence for this template from the map. This will force
// the upcoming Run call to actually evaluate and render the template.
Expand Down Expand Up @@ -455,7 +474,7 @@ func (r *Runner) internalStop(immediately bool) {

log.Printf("[INFO] (runner) stopping")
r.stopDedup()
r.stopWatcher()
r.stopWatchers()
r.stopChild(immediately)

if err := r.deletePid(); err != nil {
Expand All @@ -475,11 +494,15 @@ func (r *Runner) stopDedup() {
}
}

func (r *Runner) stopWatcher() {
func (r *Runner) stopWatchers() {
if r.watcher != nil {
log.Printf("[DEBUG] (runner) stopping watcher")
r.watcher.Stop()
}
if r.vaultTokenWatcher != nil {
log.Printf("[DEBUG] (runner) stopping vault token watcher")
r.vaultTokenWatcher.Stop()
}
}

func (r *Runner) stopChild(immediately bool) {
Expand Down
26 changes: 13 additions & 13 deletions manager/runner_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ func TestRunner_initTemplates(t *testing.T) {
},
})

r, err := NewRunner(testClients, c, true)
r, err := NewRunner(c, true)
if err != nil {
t.Fatal(err)
}
Expand All @@ -51,7 +51,7 @@ func TestRunner_initTemplates(t *testing.T) {

func TestRunner_Receive(t *testing.T) {
c := config.TestConfig(&config.Config{Once: true})
r, err := NewRunner(testClients, c, true)
r, err := NewRunner(c, true)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -476,7 +476,7 @@ func TestRunner_Run(t *testing.T) {
c.Once = true
c.Finalize()

r, err := NewRunner(testClients, c, true)
r, err := NewRunner(c, true)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -523,7 +523,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -564,7 +564,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -611,7 +611,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -659,7 +659,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -705,7 +705,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -760,7 +760,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -826,7 +826,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -902,7 +902,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -952,7 +952,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, true)
r, err := NewRunner(c, true)
if err != nil {
t.Fatal(err)
}
Expand Down Expand Up @@ -1010,7 +1010,7 @@ func TestRunner_Start(t *testing.T) {
})
c.Finalize()

r, err := NewRunner(testClients, c, false)
r, err := NewRunner(c, false)
if err != nil {
t.Fatal(err)
}
Expand Down
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