add git.iim.gay/grufwub/go-store for storage backend, replacing blob.Storage

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

vendor/git.iim.gay/grufwub/go-nowish/README.md

@@ -0,0 +1,5 @@
+nowish is a very simple library for creating Go clocks that give a good (ish)
+estimate of the "now" time, "ish" depending on the precision you request
+
+similar to fastime, but more bare bones and using unsafe pointers instead of
+atomic value since we don't need to worry about type changes

vendor/git.iim.gay/grufwub/go-nowish/time.go

@@ -0,0 +1,141 @@
+package nowish
+
+import (
+	"sync"
+	"sync/atomic"
+	"time"
+	"unsafe"
+)
+
+// Start returns a new Clock instance initialized and
+// started with the provided precision, along with the
+// stop function for it's underlying timer
+func Start(precision time.Duration) (*Clock, func()) {
+	c := Clock{}
+	return &c, c.Start(precision)
+}
+
+type Clock struct {
+	noCopy noCopy //nolint noCopy because a copy will fuck with atomics
+
+	// format stores the time formatting style string
+	format string
+
+	// valid indicates whether the current value stored in .Format is valid
+	valid uint32
+
+	// mutex protects writes to .Format, not because it would be unsafe, but
+	// because we want to minimize unnnecessary allocations
+	mutex sync.Mutex
+
+	// Format is an unsafe pointer to the last-updated time format string
+	Format unsafe.Pointer
+
+	// Time is an unsafe pointer to the last-updated time.Time object
+	Time unsafe.Pointer
+}
+
+// Start starts the clock with the provided precision, the
+// returned function is the stop function for the underlying timer
+func (c *Clock) Start(precision time.Duration) func() {
+	// Create ticker from duration
+	tick := time.NewTicker(precision)
+
+	// Set initial time
+	t := time.Now()
+	atomic.StorePointer(&c.Time, unsafe.Pointer(&t))
+
+	// Set initial format
+	s := ""
+	atomic.StorePointer(&c.Format, unsafe.Pointer(&s))
+
+	// If formatting string unset, set default
+	c.mutex.Lock()
+	if c.format == "" {
+		c.format = time.RFC822
+	}
+	c.mutex.Unlock()
+
+	// Start main routine
+	go c.run(tick)
+
+	// Return stop fn
+	return tick.Stop
+}
+
+// run is the internal clock ticking loop
+func (c *Clock) run(tick *time.Ticker) {
+	for {
+		// Wait on tick
+		_, ok := <-tick.C
+
+		// Channel closed
+		if !ok {
+			break
+		}
+
+		// Update time
+		t := time.Now()
+		atomic.StorePointer(&c.Time, unsafe.Pointer(&t))
+
+		// Invalidate format string
+		atomic.StoreUint32(&c.valid, 0)
+	}
+}
+
+// Now returns a good (ish) estimate of the current 'now' time
+func (c *Clock) Now() time.Time {
+	return *(*time.Time)(atomic.LoadPointer(&c.Time))
+}
+
+// NowFormat returns the formatted "now" time, cached until next tick and "now" updates
+func (c *Clock) NowFormat() string {
+	// If format still valid, return this
+	if atomic.LoadUint32(&c.valid) == 1 {
+		return *(*string)(atomic.LoadPointer(&c.Format))
+	}
+
+	// Get mutex lock
+	c.mutex.Lock()
+
+	// Double check still invalid
+	if atomic.LoadUint32(&c.valid) == 1 {
+		c.mutex.Unlock()
+		return *(*string)(atomic.LoadPointer(&c.Format))
+	}
+
+	// Calculate time format
+	b := c.Now().AppendFormat(
+		make([]byte, 0, len(c.format)),
+		c.format,
+	)
+
+	// Update the stored value and set valid!
+	atomic.StorePointer(&c.Format, unsafe.Pointer(&b))
+	atomic.StoreUint32(&c.valid, 1)
+
+	// Unlock and return
+	c.mutex.Unlock()
+
+	// Note:
+	// it's safe to do this conversion here
+	// because this byte slice will never change.
+	// and we have the direct pointer to it, we're
+	// not requesting it atomicly via c.Format
+	return *(*string)(unsafe.Pointer(&b))
+}
+
+// SetFormat sets the time format string used by .NowFormat()
+func (c *Clock) SetFormat(format string) {
+	// Get mutex lock
+	c.mutex.Lock()
+
+	// Update time format
+	c.format = format
+
+	// Invalidate current format string
+	atomic.StoreUint32(&c.valid, 0)
+
+	// Unlock
+	c.mutex.Unlock()
+}

vendor/git.iim.gay/grufwub/go-nowish/timeout.go

@@ -0,0 +1,111 @@
+package nowish
+
+import (
+	"errors"
+	"sync/atomic"
+	"time"
+)
+
+// ErrTimeoutStarted is returned if a Timeout interface is attempted to be reused while still in operation
+var ErrTimeoutStarted = errors.New("nowish: timeout already started")
+
+// timeoutState provides a thread-safe timeout state mechanism
+type timeoutState uint32
+
+// start attempts to start the state, must be already reset, returns success
+func (t *timeoutState) start() bool {
+	return atomic.CompareAndSwapUint32((*uint32)(t), 0, 1)
+}
+
+// stop attempts to stop the state, must already be started, returns success
+func (t *timeoutState) stop() bool {
+	return atomic.CompareAndSwapUint32((*uint32)(t), 1, 2)
+}
+
+// reset is fairly self explanatory
+func (t *timeoutState) reset() {
+	atomic.StoreUint32((*uint32)(t), 0)
+}
+
+// Timeout provides a reusable structure for enforcing timeouts with a cancel
+type Timeout interface {
+	// Start starts the timer with supplied timeout. If timeout is reached before
+	// cancel then supplied timeout hook will be called. Error may be called if
+	// Timeout is already running when this function is called
+	Start(time.Duration, func()) error
+
+	// Cancel cancels the currently running timer. If a cancel is achieved, then
+	// this function will return after the timeout goroutine is finished
+	Cancel()
+}
+
+// NewTimeout returns a new Timeout instance
+func NewTimeout() Timeout {
+	t := &timeout{
+		tk: time.NewTicker(time.Minute),
+		ch: make(chan struct{}),
+	}
+	t.tk.Stop() // don't keep it running
+	return t
+}
+
+// timeout is the Timeout implementation that we force
+// initialization on via NewTimeout by unexporting it
+type timeout struct {
+	noCopy noCopy //nolint noCopy because a copy will mess with atomics
+
+	tk *time.Ticker  // tk is the underlying timeout-timer
+	ch chan struct{} // ch is the cancel propagation channel
+	st timeoutState  // st stores the current timeout state (and protects concurrent use)
+}
+
+func (t *timeout) Start(d time.Duration, hook func()) error {
+	// Attempt to acquire start
+	if !t.st.start() {
+		return ErrTimeoutStarted
+	}
+
+	// Start the ticker
+	t.tk.Reset(d)
+
+	go func() {
+		cancelled := false
+
+		select {
+		// Timeout reached
+		case <-t.tk.C:
+			if !t.st.stop() {
+				// cancel was called in the nick of time
+				<-t.ch
+				cancelled = true
+			}
+
+		// Cancel called
+		case <-t.ch:
+			cancelled = true
+		}
+
+		// Stop ticker
+		t.tk.Stop()
+
+		// If timed out call hook
+		if !cancelled {
+			hook()
+		}
+
+		// Finally, reset state
+		t.st.reset()
+	}()
+
+	return nil
+}
+
+func (t *timeout) Cancel() {
+	// Attempt to acquire stop
+	if !t.st.stop() {
+		return
+	}
+
+	// Send a cancel signal
+	t.ch <- struct{}{}
+}

vendor/git.iim.gay/grufwub/go-nowish/util.go

@@ -0,0 +1,10 @@
+package nowish
+
+//nolint
+type noCopy struct{}
+
+//nolint
+func (*noCopy) Lock() {}
+
+//nolint
+func (*noCopy) Unlock() {}