Update github.com/kurin/blazer to 0.3.0

This commit will reduce the number of HTTP requests per file uploaded
from two to one.

Gopkg.lock

@@ -88,8 +88,8 @@
 [[projects]]
   name = "github.com/kurin/blazer"
   packages = ["b2","base","internal/b2types","internal/blog"]
-  revision = "5b348b2bdb078b06baa46ab7e12cdff12ee028ab"
-  version = "v0.2.2"
+  revision = "cd0304efa98725679cf68422cefa328d3d96f2f4"
+  version = "v0.3.0"
 
 [[projects]]
   name = "github.com/marstr/guid"

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

@@ -45,6 +45,7 @@ type Client struct {
 	slock    sync.Mutex
 	sWriters map[string]*Writer
 	sReaders map[string]*Reader
+	sMethods map[string]int
 }
 
 // NewClient creates and returns a new Client with valid B2 service account
@@ -54,7 +55,9 @@ func NewClient(ctx context.Context, account, key string, opts ...ClientOption) (
 		backend: &beRoot{
 			b2i: &b2Root{},
 		},
+		sMethods: make(map[string]int),
 	}
+	opts = append(opts, client(c))
 	if err := c.backend.authorizeAccount(ctx, account, key, opts...); err != nil {
 		return nil, err
 	}
@@ -62,6 +65,7 @@ func NewClient(ctx context.Context, account, key string, opts ...ClientOption) (
 }
 
 type clientOptions struct {
+	client          *Client
 	transport       http.RoundTripper
 	failSomeUploads bool
 	expireTokens    bool
@@ -115,13 +119,38 @@ func ForceCapExceeded() ClientOption {
 	}
 }
 
+func client(cl *Client) ClientOption {
+	return func(c *clientOptions) {
+		c.client = cl
+	}
+}
+
+type clientTransport struct {
+	client *Client
+	rt     http.RoundTripper
+}
+
+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()
+	}
+	t := ct.rt
+	if t == nil {
+		t = http.DefaultTransport
+	}
+	return t.RoundTrip(r)
+}
+
 // Bucket is a reference to a B2 bucket.
 type Bucket struct {
 	b beBucketInterface
 	r beRootInterface
 
 	c       *Client
-	urlPool sync.Pool
+	urlPool *urlPool
 }
 
 type BucketType string
@@ -189,6 +218,36 @@ func IsNotExist(err error) bool {
 	return berr.notFoundErr
 }
 
+const uploadURLPoolSize = 100
+
+type urlPool struct {
+	ch chan beURLInterface
+}
+
+func newURLPool() *urlPool {
+	return &urlPool{ch: make(chan beURLInterface, uploadURLPoolSize)}
+}
+
+func (p *urlPool) get() beURLInterface {
+	select {
+	case ue := <-p.ch:
+		// if the channel has an upload URL available, use that
+		return ue
+	default:
+		// otherwise return nil, a new upload URL needs to be generated
+		return nil
+	}
+}
+
+func (p *urlPool) put(u beURLInterface) {
+	select {
+	case p.ch <- u:
+		// put the URL back if possible
+	default:
+		// if the channel is full, throw it away
+	}
+}
+
 // Bucket returns a bucket if it exists.
 func (c *Client) Bucket(ctx context.Context, name string) (*Bucket, error) {
 	buckets, err := c.backend.listBuckets(ctx)
@@ -198,9 +257,10 @@ func (c *Client) Bucket(ctx context.Context, name string) (*Bucket, error) {
 	for _, bucket := range buckets {
 		if bucket.name() == name {
 			return &Bucket{
-				b: bucket,
-				r: c.backend,
-				c: c,
+				b:       bucket,
+				r:       c.backend,
+				c:       c,
+				urlPool: newURLPool(),
 			}, nil
 		}
 	}
@@ -221,9 +281,10 @@ func (c *Client) NewBucket(ctx context.Context, name string, attrs *BucketAttrs)
 	for _, bucket := range buckets {
 		if bucket.name() == name {
 			return &Bucket{
-				b: bucket,
-				r: c.backend,
-				c: c,
+				b:       bucket,
+				r:       c.backend,
+				c:       c,
+				urlPool: newURLPool(),
 			}, nil
 		}
 	}
@@ -235,9 +296,10 @@ func (c *Client) NewBucket(ctx context.Context, name string, attrs *BucketAttrs)
 		return nil, err
 	}
 	return &Bucket{
-		b: b,
-		r: c.backend,
-		c: c,
+		b:       b,
+		r:       c.backend,
+		c:       c,
+		urlPool: newURLPool(),
 	}, err
 }
 
@@ -250,9 +312,10 @@ func (c *Client) ListBuckets(ctx context.Context) ([]*Bucket, error) {
 	var buckets []*Bucket
 	for _, b := range bs {
 		buckets = append(buckets, &Bucket{
-			b: b,
-			r: c.backend,
-			c: c,
+			b:       b,
+			r:       c.backend,
+			c:       c,
+			urlPool: newURLPool(),
 		})
 	}
 	return buckets, nil

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

@@ -138,9 +138,11 @@ func (b *b2Root) authorizeAccount(ctx context.Context, account, key string, opts
 		f(c)
 	}
 	var aopts []base.AuthOption
+	ct := &clientTransport{client: c.client}
 	if c.transport != nil {
-		aopts = append(aopts, base.Transport(c.transport))
+		ct.rt = c.transport
 	}
+	aopts = append(aopts, base.Transport(ct))
 	if c.failSomeUploads {
 		aopts = append(aopts, base.FailSomeUploads())
 	}

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

@@ -17,7 +17,9 @@ package b2
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"crypto/sha1"
+	"encoding/hex"
 	"fmt"
 	"io"
 	"net/http"
@@ -735,21 +737,14 @@ func TestWriteEmpty(t *testing.T) {
 type rtCounter struct {
 	rt    http.RoundTripper
 	trips int
-	api   string
 	sync.Mutex
 }
 
 func (rt *rtCounter) RoundTrip(r *http.Request) (*http.Response, error) {
 	rt.Lock()
 	defer rt.Unlock()
-	resp, err := rt.rt.RoundTrip(r)
-	if err != nil {
-		return resp, err
-	}
-	if rt.api == "" || r.Header.Get("X-Blazer-Method") == rt.api {
-		rt.trips++
-	}
-	return resp, nil
+	rt.trips++
+	return rt.rt.RoundTrip(r)
 }
 
 func TestAttrsNoRoundtrip(t *testing.T) {
@@ -828,12 +823,6 @@ func TestAttrsNoRoundtrip(t *testing.T) {
 }*/
 
 func TestSmallUploadsFewRoundtrips(t *testing.T) {
-	rt := &rtCounter{rt: defaultTransport, api: "b2_get_upload_url"}
-	defaultTransport = rt
-	defer func() {
-		defaultTransport = rt.rt
-	}()
-
 	ctx := context.Background()
 	ctx, cancel := context.WithTimeout(ctx, 10*time.Minute)
 	defer cancel()
@@ -847,9 +836,11 @@ func TestSmallUploadsFewRoundtrips(t *testing.T) {
 			t.Fatal(err)
 		}
 	}
-	if rt.trips > 3 {
-		// Pool is not guaranteed to be valid, so 3 calls allows some slack.
-		t.Errorf("too many calls to b2_get_upload_url: got %d, want < 3", rt.trips)
+	si := bucket.c.Status()
+	getURL := si.MethodCalls["b2_get_upload_url"]
+	uploadFile := si.MethodCalls["b2_upload_file"]
+	if getURL >= uploadFile {
+		t.Errorf("too many calls to b2_get_upload_url")
 	}
 }
 
@@ -1001,6 +992,16 @@ func (cc *ccRC) Close() error {
 	return cc.ReadCloser.Close()
 }
 
+var uniq string
+
+func init() {
+	b := make([]byte, 4)
+	if _, err := rand.Read(b); err != nil {
+		panic(err)
+	}
+	uniq = hex.EncodeToString(b)
+}
+
 func startLiveTest(ctx context.Context, t *testing.T) (*Bucket, func()) {
 	id := os.Getenv(apiID)
 	key := os.Getenv(apiKey)
@@ -1016,7 +1017,7 @@ func startLiveTest(ctx context.Context, t *testing.T) (*Bucket, func()) {
 		t.Fatal(err)
 		return nil, nil
 	}
-	bucket, err := client.NewBucket(ctx, id+"-"+bucketName, nil)
+	bucket, err := client.NewBucket(ctx, fmt.Sprintf("%s-%s-%s", id, bucketName, uniq), nil)
 	if err != nil {
 		t.Fatal(err)
 		return nil, nil

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

@@ -18,8 +18,9 @@ import "fmt"
 
 // StatusInfo reports information about a client.
 type StatusInfo struct {
-	Writers map[string]*WriterStatus
-	Readers map[string]*ReaderStatus
+	Writers     map[string]*WriterStatus
+	Readers     map[string]*ReaderStatus
+	MethodCalls map[string]int
 }
 
 // WriterStatus reports the status for each writer.
@@ -42,8 +43,9 @@ func (c *Client) Status() *StatusInfo {
 	defer c.slock.Unlock()
 
 	si := &StatusInfo{
-		Writers: make(map[string]*WriterStatus),
-		Readers: make(map[string]*ReaderStatus),
+		Writers:     make(map[string]*WriterStatus),
+		Readers:     make(map[string]*ReaderStatus),
+		MethodCalls: make(map[string]int),
 	}
 
 	for name, w := range c.sWriters {
@@ -54,6 +56,10 @@ func (c *Client) Status() *StatusInfo {
 		si.Readers[name] = r.status()
 	}
 
+	for name, n := range c.sMethods {
+		si.MethodCalls[name] = n
+	}
+
 	return si
 }
 

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

@@ -246,12 +246,12 @@ func (w *Writer) Write(p []byte) (int, error) {
 }
 
 func (w *Writer) getUploadURL(ctx context.Context) (beURLInterface, error) {
-	u := w.o.b.urlPool.Get()
+	u := w.o.b.urlPool.get()
 	if u == nil {
 		return w.o.b.b.getUploadURL(w.ctx)
 	}
-	ue := u.(beURLInterface)
-	return ue, nil
+
+	return u, nil
 }
 
 func (w *Writer) simpleWriteFile() error {
@@ -261,7 +261,7 @@ func (w *Writer) simpleWriteFile() error {
 	}
 	// This defer needs to be in a func() so that we put whatever the value of ue
 	// is at function exit.
-	defer func() { w.o.b.urlPool.Put(ue) }()
+	defer func() { w.o.b.urlPool.put(ue) }()
 	sha1 := w.w.Hash()
 	ctype := w.contentType
 	if ctype == "" {

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

@@ -42,7 +42,7 @@ import (
 
 const (
 	APIBase          = "https://api.backblazeb2.com"
-	DefaultUserAgent = "blazer/0.2.2"
+	DefaultUserAgent = "blazer/0.3.0"
 )
 
 type b2err struct {
@@ -903,6 +903,9 @@ func (l *LargeFile) FinishLargeFile(ctx context.Context) (*File, error) {
 	}
 	b2resp := &b2types.FinishLargeFileResponse{}
 	for k, v := range l.hashes {
+		if len(b2req.Hashes) < k {
+			return nil, fmt.Errorf("b2_finish_large_file: invalid index %d", k)
+		}
 		b2req.Hashes[k-1] = v
 	}
 	headers := map[string]string{