Merge pull request #1767 from restic/update-blazer

Update github.com/kurin/blazer

Gopkg.lock

@@ -93,9 +93,9 @@
 
 [[projects]]
   name = "github.com/kurin/blazer"
-  packages = ["b2","base","internal/b2types","internal/blog"]
-  revision = "cd0304efa98725679cf68422cefa328d3d96f2f4"
-  version = "v0.3.0"
+  packages = ["b2","base","internal/b2assets","internal/b2types","internal/blog","x/window"]
+  revision = "b7c9cf27cae3aec98c2caaeb5181608bfe05b17c"
+  version = "v0.3.1"
 
 [[projects]]
   name = "github.com/marstr/guid"

vendor/github.com/kurin/blazer/b2/b2.go

@@ -45,7 +45,7 @@ type Client struct {
 	slock    sync.Mutex
 	sWriters map[string]*Writer
 	sReaders map[string]*Reader
-	sMethods map[string]int
+	sMethods []methodCounter
 }
 
 // NewClient creates and returns a new Client with valid B2 service account
@@ -55,7 +55,12 @@ func NewClient(ctx context.Context, account, key string, opts ...ClientOption) (
 		backend: &beRoot{
 			b2i: &b2Root{},
 		},
-		sMethods: make(map[string]int),
+		sMethods: []methodCounter{
+			newMethodCounter(time.Minute, time.Second),
+			newMethodCounter(time.Minute*5, time.Second),
+			newMethodCounter(time.Hour, time.Minute),
+			newMethodCounter(0, 0), // forever
+		},
 	}
 	opts = append(opts, client(c))
 	if err := c.backend.authorizeAccount(ctx, account, key, opts...); err != nil {
@@ -73,6 +78,26 @@ type clientOptions struct {
 	userAgents      []string
 }
 
+// for testing
+func (c clientOptions) eq(o clientOptions) bool {
+	if c.client != o.client ||
+		c.transport != o.transport ||
+		c.failSomeUploads != o.failSomeUploads ||
+		c.expireTokens != o.expireTokens ||
+		c.capExceeded != o.capExceeded {
+		return false
+	}
+	if len(c.userAgents) != len(o.userAgents) {
+		return false
+	}
+	for i := range c.userAgents {
+		if c.userAgents[i] != o.userAgents[i] {
+			return false
+		}
+	}
+	return true
+}
+
 // A ClientOption allows callers to adjust various per-client settings.
 type ClientOption func(*clientOptions)
 
@@ -131,17 +156,30 @@ type clientTransport struct {
 }
 
 func (ct *clientTransport) RoundTrip(r *http.Request) (*http.Response, error) {
-	method := r.Header.Get("X-Blazer-Method")
-	if method != "" && ct.client != nil {
-		ct.client.slock.Lock()
-		ct.client.sMethods[method]++
-		ct.client.slock.Unlock()
-	}
+	m := r.Header.Get("X-Blazer-Method")
 	t := ct.rt
 	if t == nil {
 		t = http.DefaultTransport
 	}
-	return t.RoundTrip(r)
+	b := time.Now()
+	resp, err := t.RoundTrip(r)
+	e := time.Now()
+	if err != nil {
+		return resp, err
+	}
+	if m != "" && ct.client != nil {
+		ct.client.slock.Lock()
+		m := method{
+			name:     m,
+			duration: e.Sub(b),
+			status:   resp.StatusCode,
+		}
+		for _, counter := range ct.client.sMethods {
+			counter.record(m)
+		}
+		ct.client.slock.Unlock()
+	}
+	return resp, nil
 }
 
 // Bucket is a reference to a B2 bucket.

vendor/github.com/kurin/blazer/b2/backend.go

@@ -37,6 +37,7 @@ type beRootInterface interface {
 type beRoot struct {
 	account, key string
 	b2i          b2RootInterface
+	options      []ClientOption
 }
 
 type beBucketInterface interface {
@@ -156,13 +157,14 @@ func (r *beRoot) authorizeAccount(ctx context.Context, account, key string, opts
 		}
 		r.account = account
 		r.key = key
+		r.options = opts
 		return nil
 	}
 	return withBackoff(ctx, r, f)
 }
 
 func (r *beRoot) reauthorizeAccount(ctx context.Context) error {
-	return r.authorizeAccount(ctx, r.account, r.key)
+	return r.authorizeAccount(ctx, r.account, r.key, r.options...)
 }
 
 func (r *beRoot) createBucket(ctx context.Context, name, btype string, info map[string]string, rules []LifecycleRule) (beBucketInterface, error) {

vendor/github.com/kurin/blazer/b2/integration_test.go

@@ -25,7 +25,6 @@ import (
 	"net/http"
 	"os"
 	"reflect"
-	"sync"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -734,26 +733,7 @@ func TestWriteEmpty(t *testing.T) {
 	}
 }
 
-type rtCounter struct {
-	rt    http.RoundTripper
-	trips int
-	sync.Mutex
-}
-
-func (rt *rtCounter) RoundTrip(r *http.Request) (*http.Response, error) {
-	rt.Lock()
-	defer rt.Unlock()
-	rt.trips++
-	return rt.rt.RoundTrip(r)
-}
-
 func TestAttrsNoRoundtrip(t *testing.T) {
-	rt := &rtCounter{rt: defaultTransport}
-	defaultTransport = rt
-	defer func() {
-		defaultTransport = rt.rt
-	}()
-
 	ctx := context.Background()
 	ctx, cancel := context.WithTimeout(ctx, 10*time.Minute)
 	defer cancel()
@@ -774,7 +754,10 @@ func TestAttrsNoRoundtrip(t *testing.T) {
 		t.Fatalf("unexpected objects: got %d, want 1", len(objs))
 	}
 
-	trips := rt.trips
+	var trips int
+	for range bucket.c.Status().table()["1m"] {
+		trips += 1
+	}
 	attrs, err := objs[0].Attrs(ctx)
 	if err != nil {
 		t.Fatal(err)
@@ -783,8 +766,12 @@ func TestAttrsNoRoundtrip(t *testing.T) {
 		t.Errorf("got the wrong object: got %q, want %q", attrs.Name, smallFileName)
 	}
 
-	if trips != rt.trips {
-		t.Errorf("Attrs() should not have caused any net traffic, but it did: old %d, new %d", trips, rt.trips)
+	var newTrips int
+	for range bucket.c.Status().table()["1m"] {
+		newTrips += 1
+	}
+	if trips != newTrips {
+		t.Errorf("Attrs() should not have caused any net traffic, but it did: old %d, new %d", trips, newTrips)
 	}
 }
 
@@ -837,8 +824,8 @@ func TestSmallUploadsFewRoundtrips(t *testing.T) {
 		}
 	}
 	si := bucket.c.Status()
-	getURL := si.MethodCalls["b2_get_upload_url"]
-	uploadFile := si.MethodCalls["b2_upload_file"]
+	getURL := si.RPCs[0].CountByMethod()["b2_get_upload_url"]
+	uploadFile := si.RPCs[0].CountByMethod()["b2_upload_file"]
 	if getURL >= uploadFile {
 		t.Errorf("too many calls to b2_get_upload_url")
 	}
@@ -882,6 +869,37 @@ func TestListUnfinishedLargeFiles(t *testing.T) {
 	}
 }
 
+func TestReauthPreservesOptions(t *testing.T) {
+	ctx := context.Background()
+	bucket, done := startLiveTest(ctx, t)
+	defer done()
+
+	var first []ClientOption
+	opts := bucket.r.(*beRoot).options
+	for _, o := range opts {
+		first = append(first, o)
+	}
+
+	if err := bucket.r.reauthorizeAccount(ctx); err != nil {
+		t.Fatalf("reauthorizeAccount: %v", err)
+	}
+
+	second := bucket.r.(*beRoot).options
+	if len(second) != len(first) {
+		t.Fatalf("options mismatch: got %d options, wanted %d", len(second), len(first))
+	}
+
+	var f, s clientOptions
+	for i := range first {
+		first[i](&f)
+		second[i](&s)
+	}
+
+	if !f.eq(s) {
+		t.Errorf("options mismatch: got %v, want %v", s, f)
+	}
+}
+
 type object struct {
 	o   *Object
 	err error

vendor/github.com/kurin/blazer/b2/monitor.go

@@ -14,13 +14,83 @@
 
 package b2
 
-import "fmt"
+import (
+	"fmt"
+	"html/template"
+	"math"
+	"net/http"
+	"sort"
+	"time"
+
+	"github.com/kurin/blazer/internal/b2assets"
+	"github.com/kurin/blazer/x/window"
+)
 
 // StatusInfo reports information about a client.
 type StatusInfo struct {
-	Writers     map[string]*WriterStatus
-	Readers     map[string]*ReaderStatus
-	MethodCalls map[string]int
+	// Writers contains the status of all current uploads with progress.
+	Writers map[string]*WriterStatus
+
+	// Readers contains the status of all current downloads with progress.
+	Readers map[string]*ReaderStatus
+
+	// RPCs contains information about recently made RPC calls over the last
+	// minute, five minutes, hour, and for all time.
+	RPCs map[time.Duration]MethodList
+}
+
+// MethodList is an accumulation of RPC calls that have been made over a given
+// period of time.
+type MethodList []method
+
+// CountByMethod returns the total RPC calls made per method.
+func (ml MethodList) CountByMethod() map[string]int {
+	r := make(map[string]int)
+	for i := range ml {
+		r[ml[i].name]++
+	}
+	return r
+}
+
+type method struct {
+	name     string
+	duration time.Duration
+	status   int
+}
+
+type methodCounter struct {
+	d time.Duration
+	w *window.Window
+}
+
+func (mc methodCounter) record(m method) {
+	mc.w.Insert([]method{m})
+}
+
+func (mc methodCounter) retrieve() MethodList {
+	ms := mc.w.Reduce()
+	return MethodList(ms.([]method))
+}
+
+func newMethodCounter(d, res time.Duration) methodCounter {
+	r := func(i, j interface{}) interface{} {
+		a, ok := i.([]method)
+		if !ok {
+			a = nil
+		}
+		b, ok := j.([]method)
+		if !ok {
+			b = nil
+		}
+		for _, m := range b {
+			a = append(a, m)
+		}
+		return a
+	}
+	return methodCounter{
+		d: d,
+		w: window.New(d, res, r),
+	}
 }
 
 // WriterStatus reports the status for each writer.
@@ -43,9 +113,9 @@ func (c *Client) Status() *StatusInfo {
 	defer c.slock.Unlock()
 
 	si := &StatusInfo{
-		Writers:     make(map[string]*WriterStatus),
-		Readers:     make(map[string]*ReaderStatus),
-		MethodCalls: make(map[string]int),
+		Writers: make(map[string]*WriterStatus),
+		Readers: make(map[string]*ReaderStatus),
+		RPCs:    make(map[time.Duration]MethodList),
 	}
 
 	for name, w := range c.sWriters {
@@ -56,13 +126,30 @@ func (c *Client) Status() *StatusInfo {
 		si.Readers[name] = r.status()
 	}
 
-	for name, n := range c.sMethods {
-		si.MethodCalls[name] = n
+	for _, c := range c.sMethods {
+		si.RPCs[c.d] = c.retrieve()
 	}
 
 	return si
 }
 
+func (si *StatusInfo) table() map[string]map[string]int {
+	r := make(map[string]map[string]int)
+	for d, c := range si.RPCs {
+		for _, m := range c {
+			if _, ok := r[m.name]; !ok {
+				r[m.name] = make(map[string]int)
+			}
+			dur := "all time"
+			if d > 0 {
+				dur = d.String()
+			}
+			r[m.name][dur]++
+		}
+	}
+	return r
+}
+
 func (c *Client) addWriter(w *Writer) {
 	c.slock.Lock()
 	defer c.slock.Unlock()
@@ -106,3 +193,59 @@ func (c *Client) removeReader(r *Reader) {
 
 	delete(c.sReaders, fmt.Sprintf("%s/%s", r.o.b.Name(), r.name))
 }
+
+var (
+	funcMap = template.FuncMap{
+		"inc":    func(i int) int { return i + 1 },
+		"lookUp": func(m map[string]int, s string) int { return m[s] },
+		"pRange": func(i int) string {
+			f := float64(i)
+			min := int(math.Pow(2, f)) - 1
+			max := min + int(math.Pow(2, f))
+			return fmt.Sprintf("%v - %v", time.Duration(min)*time.Millisecond, time.Duration(max)*time.Millisecond)
+		},
+		"methods": func(si *StatusInfo) []string {
+			methods := make(map[string]bool)
+			for _, ms := range si.RPCs {
+				for _, m := range ms {
+					methods[m.name] = true
+				}
+			}
+			var names []string
+			for name := range methods {
+				names = append(names, name)
+			}
+			sort.Strings(names)
+			return names
+		},
+		"durations": func(si *StatusInfo) []string {
+			var ds []time.Duration
+			for d := range si.RPCs {
+				ds = append(ds, d)
+			}
+			sort.Slice(ds, func(i, j int) bool { return ds[i] < ds[j] })
+			var r []string
+			for _, d := range ds {
+				dur := "all time"
+				if d > 0 {
+					dur = d.String()
+				}
+				r = append(r, dur)
+			}
+			return r
+		},
+		"table": func(si *StatusInfo) map[string]map[string]int { return si.table() },
+	}
+	statusTemplate = template.Must(template.New("status").Funcs(funcMap).Parse(string(b2assets.MustAsset("data/status.html"))))
+)
+
+// ServeHTTP serves diagnostic information about the current state of the
+// client; essentially everything available from Client.Status()
+//
+// ServeHTTP satisfies the http.Handler interface.  This means that a Client
+// can be passed directly to a path via http.Handle (or on a custom ServeMux or
+// a custom http.Server).
+func (c *Client) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	info := c.Status()
+	statusTemplate.Execute(rw, info)
+}

vendor/github.com/kurin/blazer/base/base.go

@@ -42,7 +42,7 @@ import (
 
 const (
 	APIBase          = "https://api.backblazeb2.com"
-	DefaultUserAgent = "blazer/0.3.0"
+	DefaultUserAgent = "blazer/0.3.1"
 )
 
 type b2err struct {

vendor/github.com/kurin/blazer/internal/b2assets/b2assets.go

@@ -0,0 +1,237 @@
+// Code generated by go-bindata.
+// sources:
+// data/status.html
+// DO NOT EDIT!
+
+package b2assets
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+func bindataRead(data []byte, name string) ([]byte, error) {
+	gz, err := gzip.NewReader(bytes.NewBuffer(data))
+	if err != nil {
+		return nil, fmt.Errorf("Read %q: %v", name, err)
+	}
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, gz)
+	clErr := gz.Close()
+
+	if err != nil {
+		return nil, fmt.Errorf("Read %q: %v", name, err)
+	}
+	if clErr != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+type asset struct {
+	bytes []byte
+	info  os.FileInfo
+}
+
+type bindataFileInfo struct {
+	name    string
+	size    int64
+	mode    os.FileMode
+	modTime time.Time
+}
+
+func (fi bindataFileInfo) Name() string {
+	return fi.name
+}
+func (fi bindataFileInfo) Size() int64 {
+	return fi.size
+}
+func (fi bindataFileInfo) Mode() os.FileMode {
+	return fi.mode
+}
+func (fi bindataFileInfo) ModTime() time.Time {
+	return fi.modTime
+}
+func (fi bindataFileInfo) IsDir() bool {
+	return false
+}
+func (fi bindataFileInfo) Sys() interface{} {
+	return nil
+}
+
+var _dataStatusHtml = []byte("\x1f\x8b\x08\x00\x00\x09\x6e\x88\x00\xff\xd4\x93\x41\x6f\xe3\x20\x10\x85\xef\xf9\x15\xb3\x56\x8e\x51\x90\x73\x5c\x4d\xb8\xec\xee\x79\xa3\xaa\x52\xd5\x23\x36\xa3\x60\x09\x43\x84\x71\x9a\xc8\xe2\xbf\x57\x18\x83\xa3\xb6\x87\x5e\x7b\xf2\x98\xf7\xe6\xf1\xbe\x03\xf8\xeb\xef\xff\x3f\xcf\xaf\xa7\x7f\xa0\x7c\xaf\xf9\x06\xf3\x87\x84\xe4\x1b\x00\xf4\x9d\xd7\xc4\x9b\x03\xb4\xba\x23\xe3\x61\xf0\xc2\x8f\x03\xb2\x74\xbe\x41\x96\x9c\xd8\x58\x79\x8f\x0b\xd3\xb4\xed\xc9\x2b\x2b\x07\xf8\x7d\x84\x3c\xee\x43\x48\x9a\x1c\x9d\xf0\x9d\x35\xb3\xba\xfe\x14\xdd\x8b\x46\x53\xd4\xd2\x90\xce\x51\xd5\xbc\xb5\xa3\xf1\xd0\xdc\xa1\xb5\x92\x90\xa9\x3a\xb5\x8b\xae\x38\xc5\x65\x27\xcc\x99\x60\xb9\x3e\x66\xe4\x26\x73\x48\x74\xbb\x64\x8d\xa3\xe4\xa5\x69\x08\xc8\xbc\xcc\x52\xc9\xc9\xed\xe6\xa4\x52\x75\xc9\x5a\x43\x3a\x23\xe9\x06\x4b\xf1\x7c\x79\xf1\x7f\xcc\x26\x23\x73\x1b\x96\xeb\xac\xa7\xc8\x0a\x50\x64\x1e\x2f\xda\x0a\x39\x64\xda\x87\x6e\x46\xf4\xb4\x83\xed\x55\xe8\xd8\x6e\xff\xe2\x3a\x4f\xae\x70\xaa\x03\x9f\xa6\x64\x82\x58\x40\x1d\x3e\xc1\x75\x72\x07\xdb\x8b\xb3\xe7\x99\xee\x2a\xf4\xfe\xe4\xec\xd9\xd1\xb0\x02\x46\xb4\x36\x3a\x43\x00\xbc\x2c\x2a\x5c\x85\x1e\xe9\x58\x4d\xd3\xbc\x1d\x42\x05\xbd\xb8\x1d\xab\xba\xe2\xc8\xb2\x89\x63\xe3\x80\x7d\x05\xfd\x80\xaa\x6a\x2e\xed\x9b\xf9\x26\xe1\x13\x09\xf9\xa3\x08\x91\xa5\x17\x81\x2c\xbd\xa8\xf7\x00\x00\x00\xff\xff\xd4\xf0\x90\xb4\x69\x03\x00\x00")
+
+func dataStatusHtmlBytes() ([]byte, error) {
+	return bindataRead(
+		_dataStatusHtml,
+		"data/status.html",
+	)
+}
+
+func dataStatusHtml() (*asset, error) {
+	bytes, err := dataStatusHtmlBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "data/status.html", size: 873, mode: os.FileMode(436), modTime: time.Unix(1520578750, 0)}
+	a := &asset{bytes: bytes, info: info}
+	return a, nil
+}
+
+// Asset loads and returns the asset for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func Asset(name string) ([]byte, error) {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[cannonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("Asset %s can't read by error: %v", name, err)
+		}
+		return a.bytes, nil
+	}
+	return nil, fmt.Errorf("Asset %s not found", name)
+}
+
+// MustAsset is like Asset but panics when Asset would return an error.
+// It simplifies safe initialization of global variables.
+func MustAsset(name string) []byte {
+	a, err := Asset(name)
+	if err != nil {
+		panic("asset: Asset(" + name + "): " + err.Error())
+	}
+
+	return a
+}
+
+// AssetInfo loads and returns the asset info for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func AssetInfo(name string) (os.FileInfo, error) {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[cannonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("AssetInfo %s can't read by error: %v", name, err)
+		}
+		return a.info, nil
+	}
+	return nil, fmt.Errorf("AssetInfo %s not found", name)
+}
+
+// AssetNames returns the names of the assets.
+func AssetNames() []string {
+	names := make([]string, 0, len(_bindata))
+	for name := range _bindata {
+		names = append(names, name)
+	}
+	return names
+}
+
+// _bindata is a table, holding each asset generator, mapped to its name.
+var _bindata = map[string]func() (*asset, error){
+	"data/status.html": dataStatusHtml,
+}
+
+// AssetDir returns the file names below a certain
+// directory embedded in the file by go-bindata.
+// For example if you run go-bindata on data/... and data contains the
+// following hierarchy:
+//     data/
+//       foo.txt
+//       img/
+//         a.png
+//         b.png
+// then AssetDir("data") would return []string{"foo.txt", "img"}
+// AssetDir("data/img") would return []string{"a.png", "b.png"}
+// AssetDir("foo.txt") and AssetDir("notexist") would return an error
+// AssetDir("") will return []string{"data"}.
+func AssetDir(name string) ([]string, error) {
+	node := _bintree
+	if len(name) != 0 {
+		cannonicalName := strings.Replace(name, "\\", "/", -1)
+		pathList := strings.Split(cannonicalName, "/")
+		for _, p := range pathList {
+			node = node.Children[p]
+			if node == nil {
+				return nil, fmt.Errorf("Asset %s not found", name)
+			}
+		}
+	}
+	if node.Func != nil {
+		return nil, fmt.Errorf("Asset %s not found", name)
+	}
+	rv := make([]string, 0, len(node.Children))
+	for childName := range node.Children {
+		rv = append(rv, childName)
+	}
+	return rv, nil
+}
+
+type bintree struct {
+	Func     func() (*asset, error)
+	Children map[string]*bintree
+}
+var _bintree = &bintree{nil, map[string]*bintree{
+	"data": &bintree{nil, map[string]*bintree{
+		"status.html": &bintree{dataStatusHtml, map[string]*bintree{}},
+	}},
+}}
+
+// RestoreAsset restores an asset under the given directory
+func RestoreAsset(dir, name string) error {
+	data, err := Asset(name)
+	if err != nil {
+		return err
+	}
+	info, err := AssetInfo(name)
+	if err != nil {
+		return err
+	}
+	err = os.MkdirAll(_filePath(dir, filepath.Dir(name)), os.FileMode(0755))
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(_filePath(dir, name), data, info.Mode())
+	if err != nil {
+		return err
+	}
+	err = os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// RestoreAssets restores an asset under the given directory recursively
+func RestoreAssets(dir, name string) error {
+	children, err := AssetDir(name)
+	// File
+	if err != nil {
+		return RestoreAsset(dir, name)
+	}
+	// Dir
+	for _, child := range children {
+		err = RestoreAssets(dir, filepath.Join(name, child))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func _filePath(dir, name string) string {
+	cannonicalName := strings.Replace(name, "\\", "/", -1)
+	return filepath.Join(append([]string{dir}, strings.Split(cannonicalName, "/")...)...)
+}
+

vendor/github.com/kurin/blazer/internal/b2assets/data/status.html

@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>b2 client status</title>
+</head>
+<body>
+  {{$methods := methods .}}
+  {{$durations := durations .}}
+  {{$table := table .}}
+  <h1>count by code</h1>
+  <table>
+    {{range $method := $methods}}
+    <tr>
+      <td>{{$method}}</td>
+      {{range $duration := $durations}}
+        <td>{{index $table $method $duration}}</td>
+      {{end}}
+    </tr>
+    {{end}}
+  </table>
+  <h1>uploads</h1>
+    {{range $name, $val := .Writers}}
+    <h2>{{ $name }}</h2>
+      {{range $id, $prog := $val.Progress}}
+      {{inc $id}} <progress value="{{$prog}}" max="1"></progress><br />
+      {{end}}
+    {{end}}
+  <h1>downloads</h1>
+    {{range $name, $val := .Readers}}
+    <h2>{{ $name }}</h2>
+      {{range $id, $prog := $val.Progress}}
+      {{inc $id}} <progress value="{{$prog}}" max="1"></progress><br />
+      {{end}}
+    {{end}}
+</body>
+</html>

vendor/github.com/kurin/blazer/internal/b2assets/gen.go

@@ -0,0 +1,18 @@
+// Copyright 2018, Google
+//
+// 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 b2assets contains data required by other libraries in blazer.
+package b2assets
+
+//go:generate go-bindata -pkg $GOPACKAGE -o b2assets.go data/

vendor/github.com/kurin/blazer/x/window/accum_test.go

@@ -0,0 +1,63 @@
+// Copyright 2018, Google
+//
+// 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 window_test
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/kurin/blazer/x/window"
+)
+
+type Accumulator struct {
+	w *window.Window
+}
+
+func (a Accumulator) Add(s string) {
+	a.w.Insert([]string{s})
+}
+
+func (a Accumulator) All() []string {
+	v := a.w.Reduce()
+	return v.([]string)
+}
+
+func NewAccum(size time.Duration) Accumulator {
+	r := func(i, j interface{}) interface{} {
+		a, ok := i.([]string)
+		if !ok {
+			a = nil
+		}
+		b, ok := j.([]string)
+		if !ok {
+			b = nil
+		}
+		for _, s := range b {
+			a = append(a, s)
+		}
+		return a
+	}
+	return Accumulator{w: window.New(size, time.Second, r)}
+}
+
+func Example_accumulator() {
+	a := NewAccum(time.Minute)
+	a.Add("this")
+	a.Add("is")
+	a.Add("that")
+	fmt.Printf("total: %v\n", a.All())
+	// Output:
+	// total: [this is that]
+}

vendor/github.com/kurin/blazer/x/window/counter_test.go

@@ -0,0 +1,60 @@
+// Copyright 2018, Google
+//
+// 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 window_test
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/kurin/blazer/x/window"
+)
+
+type Counter struct {
+	w *window.Window
+}
+
+func (c Counter) Add() {
+	c.w.Insert(1)
+}
+
+func (c Counter) Count() int {
+	v := c.w.Reduce()
+	return v.(int)
+}
+
+func New(size time.Duration) Counter {
+	r := func(i, j interface{}) interface{} {
+		a, ok := i.(int)
+		if !ok {
+			a = 0
+		}
+		b, ok := j.(int)
+		if !ok {
+			b = 0
+		}
+		return a + b
+	}
+	return Counter{w: window.New(size, time.Second, r)}
+}
+
+func Example_counter() {
+	c := New(time.Minute)
+	c.Add()
+	c.Add()
+	c.Add()
+	fmt.Printf("total: %d\n", c.Count())
+	// Output:
+	// total: 3
+}

vendor/github.com/kurin/blazer/x/window/window.go

@@ -0,0 +1,151 @@
+// Copyright 2018, Google
+//
+// 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 window provides a type for efficiently recording events as they
+// occur over a given span of time.  Events added to the window will remain
+// until the time expires.
+package window
+
+import (
+	"sync"
+	"time"
+)
+
+// A Window efficiently records events that have occurred over a span of time
+// extending from some fixed interval ago to now.  Events that pass beyond this
+// horizon effectively "fall off" the back of the window.
+type Window struct {
+	mu      sync.Mutex
+	events  []interface{}
+	res     time.Duration
+	last    time.Time
+	reduce  Reducer
+	forever bool
+	e       interface{}
+}
+
+// A Reducer should take two values from the window and combine them into a
+// third value that will be stored in the window.  The values i or j may be
+// nil.  The underlying types for both arguments and the output should be
+// identical.
+//
+// If the reducer is any kind of slice or list, then data usage will grow
+// linearly with the number of events added to the window.
+//
+// Reducer will be called on its own output: Reducer(Reducer(x, y), z).
+type Reducer func(i, j interface{}) interface{}
+
+// New returns an initialized window for events over the given duration at the
+// given resolution.  Windows with tight resolution (i.e., small values for
+// that argument) will be more accurate, at the cost of some memory.
+//
+// A size of 0 means "forever"; old events will never be removed.
+func New(size, resolution time.Duration, r Reducer) *Window {
+	if size > 0 {
+		return &Window{
+			res:    resolution,
+			events: make([]interface{}, size/resolution),
+			reduce: r,
+		}
+	}
+	return &Window{
+		forever: true,
+		reduce:  r,
+	}
+}
+
+func (w *Window) bucket(now time.Time) int {
+	nanos := now.UnixNano()
+	abs := nanos / int64(w.res)
+	return int(abs) % len(w.events)
+}
+
+// sweep keeps the window valid.  It needs to be called from every method that
+// views or updates the window, and the caller needs to hold the mutex.
+func (w *Window) sweep(now time.Time) {
+	if w.forever {
+		return
+	}
+	defer func() {
+		w.last = now
+	}()
+
+	b := w.bucket(now)
+	p := w.bucket(w.last)
+
+	if b == p && now.Sub(w.last) <= w.res {
+		// We're in the same bucket as the previous sweep, so all buckets are
+		// valid.
+		return
+	}
+
+	if now.Sub(w.last) > w.res*time.Duration(len(w.events)) {
+		// We've gone longer than this window measures since the last sweep, just
+		// zero the thing and have done.
+		for i := range w.events {
+			w.events[i] = nil
+		}
+		return
+	}
+
+	// Expire all invalid buckets.  This means buckets not seen since the
+	// previous sweep and now, including the current bucket but not including the
+	// previous bucket.
+	old := int(w.last.UnixNano()) / int(w.res)
+	new := int(now.UnixNano()) / int(w.res)
+	for i := old + 1; i <= new; i++ {
+		b := i % len(w.events)
+		w.events[b] = nil
+	}
+}
+
+// Insert adds the given event.
+func (w *Window) Insert(e interface{}) {
+	w.insertAt(time.Now(), e)
+}
+
+func (w *Window) insertAt(t time.Time, e interface{}) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if w.forever {
+		w.e = w.reduce(w.e, e)
+		return
+	}
+
+	w.sweep(t)
+	w.events[w.bucket(t)] = w.reduce(w.events[w.bucket(t)], e)
+}
+
+// Reduce runs the window's reducer over the valid values and returns the
+// result.
+func (w *Window) Reduce() interface{} {
+	return w.reducedAt(time.Now())
+}
+
+func (w *Window) reducedAt(t time.Time) interface{} {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if w.forever {
+		return w.e
+	}
+
+	w.sweep(t)
+	var n interface{}
+	for i := range w.events {
+		n = w.reduce(n, w.events[i])
+	}
+	return n
+}

vendor/github.com/kurin/blazer/x/window/window_test.go

@@ -0,0 +1,88 @@
+// Copyright 2018, Google
+//
+// 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 window
+
+import (
+	"testing"
+	"time"
+)
+
+type epair struct {
+	e interface{}
+	t time.Time
+}
+
+func adder(i, j interface{}) interface{} {
+	a, ok := i.(int)
+	if !ok {
+		a = 0
+	}
+	b, ok := j.(int)
+	if !ok {
+		b = 0
+	}
+	return a + b
+}
+
+func TestWindows(t *testing.T) {
+	table := []struct {
+		size, dur time.Duration
+		incs      []epair
+		look      time.Time
+		reduce    Reducer
+		want      interface{}
+	}{
+		{
+			size: time.Minute,
+			dur:  time.Second,
+			incs: []epair{
+				// year, month, day, hour, min, sec, nano
+				{t: time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 2, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 3, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 4, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 5, 0, time.UTC), e: 1},
+			},
+			look:   time.Date(2000, 1, 1, 0, 1, 0, 0, time.UTC),
+			want:   5,
+			reduce: adder,
+		},
+		{
+			incs: []epair{
+				// year, month, day, hour, min, sec, nano
+				{t: time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 2, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 3, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 4, 0, time.UTC), e: 1},
+				{t: time.Date(2000, 1, 1, 0, 0, 5, 0, time.UTC), e: 1},
+			},
+			want:   6,
+			reduce: adder,
+		},
+	}
+
+	for _, e := range table {
+		w := New(e.size, e.dur, e.reduce)
+		for _, inc := range e.incs {
+			w.insertAt(inc.t, inc.e)
+		}
+		ct := w.reducedAt(e.look)
+		if ct != e.want {
+			t.Errorf("reducedAt(%v) got %v, want %v", e.look, ct, e.want)
+		}
+	}
+}