bump snap version

Bump golang.org/x/net from 0.5.0 to 0.7.0

README.md

@@ -156,6 +156,8 @@ zagent248.hola.org,165.22.65.3,22222,22223,22224,22225,22226,digitalocean
 
 | Argument | Type | Description |
 | -------- | ---- | ----------- |
+| backoff-deadline | Duration | total duration of zgettunnels method attempts (default 5m0s) |
+| backoff-initial | Duration | initial average backoff delay for zgettunnels (randomized by +/-50%) (default 3s) |
 | bind-address | String | HTTP proxy address to listen to (default "127.0.0.1:8080") |
 | cafile | String | use custom CA certificate bundle file |
 | country | String | desired proxy location (default "us") |

credservice.go

@@ -12,9 +12,10 @@ const DEFAULT_LIST_LIMIT = 3
 func CredService(interval, timeout time.Duration,
 	country string,
 	proxytype string,
-	logger *CondLogger) (auth AuthProvider,
-	tunnels *ZGetTunnelsResponse,
-	err error) {
+	logger *CondLogger,
+	backoffInitial time.Duration,
+	backoffDeadline time.Duration,
+) (auth AuthProvider, tunnels *ZGetTunnelsResponse, err error) {
 	var mux sync.Mutex
 	var auth_header, user_uuid string
 	auth = func() (res string) {
@@ -25,7 +26,8 @@ func CredService(interval, timeout time.Duration,
 	}
 
 	tx_res, tx_err := EnsureTransaction(context.Background(), timeout, func(ctx context.Context, client *http.Client) bool {
-		tunnels, user_uuid, err = Tunnels(ctx, logger, client, country, proxytype, DEFAULT_LIST_LIMIT)
+		tunnels, user_uuid, err = Tunnels(ctx, logger, client, country, proxytype,
+			DEFAULT_LIST_LIMIT, timeout, backoffInitial, backoffDeadline)
 		if err != nil {
 			logger.Error("Configuration bootstrap error: %v. Retrying with the fallback mechanism...", err)
 			return false
@@ -55,7 +57,8 @@ func CredService(interval, timeout time.Duration,
 			<-ticker.C
 			logger.Info("Rotating credentials...")
 			tx_res, tx_err := EnsureTransaction(context.Background(), timeout, func(ctx context.Context, client *http.Client) bool {
-				tuns, user_uuid, err = Tunnels(ctx, logger, client, country, proxytype, DEFAULT_LIST_LIMIT)
+				tuns, user_uuid, err = Tunnels(ctx, logger, client, country, proxytype,
+					DEFAULT_LIST_LIMIT, timeout, backoffInitial, backoffDeadline)
 				if err != nil {
 					logger.Error("Credential rotation error: %v. Retrying with the fallback mechanism...", err)
 					return false

go.mod

@@ -3,36 +3,32 @@ module github.com/Snawoot/hola-proxy
 go 1.19
 
 require (
-	github.com/AdguardTeam/dnsproxy v0.46.6
+	github.com/AdguardTeam/dnsproxy v0.48.2
 	github.com/campoy/unique v0.0.0-20180121183637-88950e537e7e
+	github.com/cenkalti/backoff/v4 v4.2.0
 	github.com/google/uuid v1.3.0
-	github.com/miekg/dns v1.1.50
-	golang.org/x/net v0.5.0
+	github.com/miekg/dns v1.1.52
+	golang.org/x/net v0.8.0
 )
 
 require (
-	github.com/AdguardTeam/golibs v0.11.4 // indirect
+	github.com/AdguardTeam/golibs v0.13.0 // indirect
 	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da // indirect
 	github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 // indirect
-	github.com/ameshkov/dnscrypt/v2 v2.2.5 // indirect
+	github.com/ameshkov/dnscrypt/v2 v2.2.6 // indirect
 	github.com/ameshkov/dnsstamps v1.0.3 // indirect
-	github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0 // indirect
-	github.com/bluele/gcache v0.0.2 // indirect
-	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
 	github.com/golang/mock v1.6.0 // indirect
-	github.com/google/pprof v0.0.0-20230131232505-5a9e8f65f08f // indirect
-	github.com/jessevdk/go-flags v1.5.0 // indirect
-	github.com/lucas-clemente/quic-go v0.31.1 // indirect
-	github.com/marten-seemann/qpack v0.3.0 // indirect
-	github.com/marten-seemann/qtls-go1-18 v0.1.4 // indirect
-	github.com/marten-seemann/qtls-go1-19 v0.1.2 // indirect
-	github.com/onsi/ginkgo/v2 v2.8.0 // indirect
-	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
-	golang.org/x/crypto v0.5.0 // indirect
-	golang.org/x/exp v0.0.0-20230203172020-98cc5a0785f9 // indirect
-	golang.org/x/mod v0.7.0 // indirect
-	golang.org/x/sys v0.4.0 // indirect
-	golang.org/x/text v0.6.0 // indirect
-	golang.org/x/tools v0.5.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
+	github.com/google/pprof v0.0.0-20230323073829-e72429f035bd // indirect
+	github.com/onsi/ginkgo/v2 v2.9.2 // indirect
+	github.com/quic-go/qpack v0.4.0 // indirect
+	github.com/quic-go/qtls-go1-19 v0.3.0 // indirect
+	github.com/quic-go/qtls-go1-20 v0.2.0 // indirect
+	github.com/quic-go/quic-go v0.33.0 // indirect
+	golang.org/x/crypto v0.7.0 // indirect
+	golang.org/x/exp v0.0.0-20230321023759-10a507213a29 // indirect
+	golang.org/x/mod v0.9.0 // indirect
+	golang.org/x/sys v0.6.0 // indirect
+	golang.org/x/text v0.8.0 // indirect
+	golang.org/x/tools v0.7.0 // indirect
 )

go.sum

@@ -1,132 +1,90 @@
-github.com/AdguardTeam/dnsproxy v0.46.5 h1:TiJZhwaIDDaKkqEfJ9AD9aroFjcHN8oEbKB8WfTjSIs=
-github.com/AdguardTeam/dnsproxy v0.46.5/go.mod h1:yKBVgFlE6CqTQtye++3e7SATaMPc4Ixij+KkHsM6HhM=
-github.com/AdguardTeam/dnsproxy v0.46.6 h1:a6Ex1ZIytHelbEyHJRGEKWNaJgY3OtArYkjoGLwErlI=
-github.com/AdguardTeam/dnsproxy v0.46.6/go.mod h1:ZEkTmTJ2XInT3aVy0mHtEnSWSclpHHj/9hfNXDuAk5k=
-github.com/AdguardTeam/golibs v0.11.2 h1:JbQB1Dg2JWStXgHh1QqBbOLWnP4t9oDjppoBH6TVXSE=
-github.com/AdguardTeam/golibs v0.11.2/go.mod h1:87bN2x4VsTritptE3XZg9l8T6gznWsIxHBcQ1DeRIXA=
-github.com/AdguardTeam/golibs v0.11.4 h1:IltyvxwCTN+xxJF5sh6VadF8Zfbf8elgCm9dgijSVzM=
-github.com/AdguardTeam/golibs v0.11.4/go.mod h1:87bN2x4VsTritptE3XZg9l8T6gznWsIxHBcQ1DeRIXA=
+github.com/AdguardTeam/dnsproxy v0.48.2 h1:zEWeImyJGPeQAZ7+F/sgOJ2WbCRN1zbINLsDAEnFWjI=
+github.com/AdguardTeam/dnsproxy v0.48.2/go.mod h1:Y7g7jRTd/u7+KJ/QvnGI2PCE8vnisp6EsW47/Sz0DZw=
+github.com/AdguardTeam/golibs v0.13.0 h1:hVBeNQXT/BgcjKz/4FMpFGvEYqXiXDJG+b5XpGCUOLk=
+github.com/AdguardTeam/golibs v0.13.0/go.mod h1:rIglKDHdLvFT1UbhumBLHO9S4cvWS9MEyT1njommI/Y=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
 github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 h1:52m0LGchQBBVqJRyYYufQuIbVqRawmubW3OFGqK1ekw=
 github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635/go.mod h1:lmLxL+FV291OopO93Bwf9fQLQeLyt33VJRUg5VJ30us=
-github.com/ameshkov/dnscrypt/v2 v2.2.5 h1:Ju1gQeez+6XLtk/b/k3RoJ2t+Ls+BSItLTZjZeedneY=
-github.com/ameshkov/dnscrypt/v2 v2.2.5/go.mod h1:Cu5GgMvCR10BeXgACiGDwXyOpfMktsSIidml1XBp6uM=
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-github.com/bluele/gcache v0.0.2 h1:WcbfdXICg7G/DGBh1PFfcirkWOQV+v077yF1pSy3DGw=
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-github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
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+github.com/quic-go/quic-go v0.33.0/go.mod h1:YMuhaAV9/jIu0XclDXwZPAsP/2Kgr5yMYhe9oxhhOFA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90 h1:Y/gsMcFOcR+6S6f3YeMKl5g+dZMEWqcz5Czj/GWYbkM=
-golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/crypto v0.5.0 h1:U/0M97KRkSFvyD/3FSmdP5W5swImpNgle/EHFhOsQPE=
-golang.org/x/crypto v0.5.0/go.mod h1:NK/OQwhpMQP3MwtdjgLlYHnH9ebylxKWv3e0fK+mkQU=
-golang.org/x/exp v0.0.0-20221019170559-20944726eadf h1:nFVjjKDgNY37+ZSYCJmtYf7tOlfQswHqplG2eosjOMg=
-golang.org/x/exp v0.0.0-20221019170559-20944726eadf/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
-golang.org/x/exp v0.0.0-20230203172020-98cc5a0785f9 h1:frX3nT9RkKybPnjyI+yvZh6ZucTZatCCEm9D47sZ2zo=
-golang.org/x/exp v0.0.0-20230203172020-98cc5a0785f9/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
+golang.org/x/crypto v0.7.0 h1:AvwMYaRytfdeVt3u6mLaxYtErKYjxA2OXjJ1HHq6t3A=
+golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU=
+golang.org/x/exp v0.0.0-20230321023759-10a507213a29 h1:ooxPy7fPvB4kwsA2h+iBNHkAbp/4JxTSwCmvdjEYmug=
+golang.org/x/exp v0.0.0-20230321023759-10a507213a29/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
-golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
-golang.org/x/mod v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
-golang.org/x/mod v0.7.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.9.0 h1:KENHtAZL2y3NLMYZeHY9DW8HW8V+kQyJsY/V9JlKvCs=
+golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
-golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.5.0 h1:GyT4nK/YDHSqa1c4753ouYCDajOYKTja9Xb/OHtgvSw=
-golang.org/x/net v0.5.0/go.mod h1:DivGGAXEgPSlEBzxGzZI+ZLohi+xUj054jfeKui00ws=
+golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
+golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 h1:uVc8UZUe6tr40fFVnUP5Oj+veunVezqYl9z7DYw9xzw=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
-golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.6.0 h1:3XmdazWV+ubf7QgHSTWeykHOci5oeekaGJBLkrkaw4k=
-golang.org/x/text v0.6.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68=
+golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
-golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
-golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
-golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/tools v0.5.0 h1:+bSpV5HIeWkuvgaMfI3UmKRThoTA5ODJTUd8T17NO+4=
-golang.org/x/tools v0.5.0/go.mod h1:N+Kgy78s5I24c24dU8OfWNEotWjutIs8SnJvn5IDq+k=
+golang.org/x/tools v0.7.0 h1:W4OVu8VVOaIO0yzWMNdepAulS7YfoS3Zabrm8DOXXU4=
+golang.org/x/tools v0.7.0/go.mod h1:4pg6aUX35JBAogB10C9AtvVL+qowtN4pT3CGSQex14s=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

holaapi.go

@@ -20,6 +20,7 @@ import (
 	"time"
 
 	"github.com/campoy/unique"
+	"github.com/cenkalti/backoff/v4"
 	"github.com/google/uuid"
 )
 
@@ -35,11 +36,9 @@ const LOGIN_PREFIX = "user-uuid-"
 const FALLBACK_CONF_URL = "https://www.dropbox.com/s/jemizcvpmf2qb9v/cloud_failover.conf?dl=1"
 const AGENT_SUFFIX = ".hola.org"
 
-const MinTunnelsPause = 10 * time.Second
-const MaxTunnelsPause = 25 * time.Second
-
 var TemporaryBanError = errors.New("temporary ban detected")
 var PermanentBanError = errors.New("permanent ban detected")
+var EmptyResponseError = errors.New("empty response")
 
 type CountryList []string
 
@@ -251,7 +250,13 @@ func zgettunnels(ctx context.Context,
 		reterr = err
 		return
 	}
-	reterr = json.Unmarshal(data, &tunnels)
+	err = json.Unmarshal(data, &tunnels)
+	if err != nil {
+		return nil, fmt.Errorf("unable to unmashal zgettunnels response: %w", err)
+	}
+	if len(tunnels.IPList) == 0 {
+		return nil, EmptyResponseError
+	}
 	res = &tunnels
 	return
 }
@@ -322,18 +327,42 @@ func Tunnels(ctx context.Context,
 	client *http.Client,
 	country string,
 	proxy_type string,
-	limit uint) (res *ZGetTunnelsResponse, user_uuid string, reterr error) {
+	limit uint,
+	timeout time.Duration,
+	backoffInitial time.Duration,
+	backoffDeadline time.Duration,
+) (res *ZGetTunnelsResponse, user_uuid string, reterr error) {
 	u := uuid.New()
 	user_uuid = hex.EncodeToString(u[:])
-	initres, err := background_init(ctx, client, user_uuid)
+	ctx1, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	initres, err := background_init(ctx1, client, user_uuid)
 	if err != nil {
 		reterr = err
 		return
 	}
-	sleepDuration := time.Duration(RandRange(float64(MinTunnelsPause), float64(MaxTunnelsPause)))
-	logger.Info("Sleeping for %v...", sleepDuration)
-	time.Sleep(sleepDuration)
-	res, reterr = zgettunnels(ctx, client, user_uuid, initres.Key, country, proxy_type, limit)
+	var bo backoff.BackOff = &backoff.ExponentialBackOff{
+		InitialInterval:     backoffInitial,
+		RandomizationFactor: 0.5,
+		Multiplier:          1.5,
+		MaxInterval:         10 * time.Minute,
+		MaxElapsedTime:      backoffDeadline,
+		Stop:                backoff.Stop,
+		Clock:               backoff.SystemClock,
+	}
+	bo = backoff.WithContext(bo, ctx)
+	err = backoff.RetryNotify(func() error {
+		ctx1, cancel := context.WithTimeout(ctx, timeout)
+		defer cancel()
+		res, reterr = zgettunnels(ctx1, client, user_uuid, initres.Key, country, proxy_type, limit)
+		return reterr
+	}, bo, func(err error, dur time.Duration) {
+		logger.Info("zgettunnels error: %v; will retry after %v", err, dur.Truncate(time.Millisecond))
+	})
+	if err != nil {
+		logger.Error("All attempts failed: %v", err)
+		return nil, "", err
+	}
 	return
 }
 
@@ -376,19 +405,18 @@ func httpClientWithProxy(agent *FallbackAgent) *http.Client {
 	}
 }
 
-func EnsureTransaction(baseCtx context.Context, txnTimeout time.Duration, txn func(context.Context, *http.Client) bool) (bool, error) {
+func EnsureTransaction(ctx context.Context, getFBTimeout time.Duration, txn func(context.Context, *http.Client) bool) (bool, error) {
 	client := httpClientWithProxy(nil)
 	defer client.CloseIdleConnections()
 
-	ctx, cancel := context.WithTimeout(baseCtx, txnTimeout)
-	defer cancel()
-
 	if txn(ctx, client) {
 		return true, nil
 	}
 
 	// Fallback needed
-	fbc, err := GetFallbackProxies(baseCtx)
+	getFBCtx, cancel := context.WithTimeout(ctx, getFBTimeout)
+	defer cancel()
+	fbc, err := GetFallbackProxies(getFBCtx)
 	if err != nil {
 		return false, err
 	}
@@ -396,10 +424,6 @@ func EnsureTransaction(baseCtx context.Context, txnTimeout time.Duration, txn fu
 	for _, agent := range fbc.Agents {
 		client = httpClientWithProxy(&agent)
 		defer client.CloseIdleConnections()
-
-		ctx, cancel = context.WithTimeout(baseCtx, txnTimeout)
-		defer cancel()
-
 		if txn(ctx, client) {
 			return true, nil
 		}

main.go

@@ -54,6 +54,10 @@ type CLIArgs struct {
 	showVersion                             bool
 	proxy                                   string
 	caFile                                  string
+	minPause                                time.Duration
+	maxPause                                time.Duration
+	backoffInitial                          time.Duration
+	backoffDeadline                         time.Duration
 }
 
 func parse_args() CLIArgs {
@@ -66,8 +70,10 @@ func parse_args() CLIArgs {
 	flag.StringVar(&args.bind_address, "bind-address", "127.0.0.1:8080", "HTTP proxy listen address")
 	flag.IntVar(&args.verbosity, "verbosity", 20, "logging verbosity "+
 		"(10 - debug, 20 - info, 30 - warning, 40 - error, 50 - critical)")
-	flag.DurationVar(&args.timeout, "timeout", 35*time.Second, "timeout for network operations")
+	flag.DurationVar(&args.timeout, "timeout", 10*time.Second, "timeout for network operations")
 	flag.DurationVar(&args.rotate, "rotate", 1*time.Hour, "rotate user ID once per given period")
+	flag.DurationVar(&args.backoffInitial, "backoff-initial", 3*time.Second, "initial average backoff delay for zgettunnels (randomized by +/-50%)")
+	flag.DurationVar(&args.backoffDeadline, "backoff-deadline", 5*time.Minute, "total duration of zgettunnels method attempts")
 	flag.StringVar(&args.proxy_type, "proxy-type", "direct", "proxy type: direct or lum") // or skip but not mentioned
 	// skip would be used something like this: `./bin/hola-proxy -proxy-type skip -force-port-field 24232 -country ua.peer` for debugging
 	flag.StringVar(&args.resolver, "resolver", "https://cloudflare-dns.com/dns-query",
@@ -163,8 +169,10 @@ func run() int {
 	if args.list_countries {
 		return print_countries(args.timeout)
 	}
+
 	if args.list_proxies {
-		return print_proxies(mainLogger, args.country, args.proxy_type, args.limit, args.timeout)
+		return print_proxies(mainLogger, args.country, args.proxy_type, args.limit, args.timeout,
+			args.backoffInitial, args.backoffDeadline)
 	}
 
 	mainLogger.Info("hola-proxy client version %s is starting...", version)
@@ -176,7 +184,8 @@ func run() int {
 	}
 
 	mainLogger.Info("Initializing configuration provider...")
-	auth, tunnels, err := CredService(args.rotate, args.timeout, args.country, args.proxy_type, credLogger)
+	auth, tunnels, err := CredService(args.rotate, args.timeout, args.country, args.proxy_type, credLogger,
+		args.backoffInitial, args.backoffDeadline)
 	if err != nil {
 		mainLogger.Critical("Unable to instantiate credential service: %v", err)
 		return 4

snapcraft.yaml

@@ -1,5 +1,5 @@
 name: hola-proxy
-version: '1.5.9'
+version: '1.7.1'
 summary: Standalone Hola proxy client.
 description: |
   Standalone Hola proxy client. Just run it and it'll start plain HTTP proxy server forwarding traffic via Hola proxies of your choice.

utils.go

@@ -112,7 +112,9 @@ func print_countries(timeout time.Duration) int {
 		err       error
 	)
 	tx_res, tx_err := EnsureTransaction(context.Background(), timeout, func(ctx context.Context, client *http.Client) bool {
-		countries, err = VPNCountries(ctx, client)
+		ctx1, cancel := context.WithTimeout(ctx, timeout)
+		defer cancel()
+		countries, err = VPNCountries(ctx1, client)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Transaction error: %v. Retrying with the fallback mechanism...\n", err)
 			return false
@@ -133,14 +135,16 @@ func print_countries(timeout time.Duration) int {
 	return 0
 }
 
-func print_proxies(logger *CondLogger, country string, proxy_type string, limit uint, timeout time.Duration) int {
+func print_proxies(logger *CondLogger, country string, proxy_type string,
+	limit uint, timeout time.Duration, backoffInitial time.Duration, backoffDeadline time.Duration,
+) int {
 	var (
 		tunnels   *ZGetTunnelsResponse
 		user_uuid string
 		err       error
 	)
 	tx_res, tx_err := EnsureTransaction(context.Background(), timeout, func(ctx context.Context, client *http.Client) bool {
-		tunnels, user_uuid, err = Tunnels(ctx, logger, client, country, proxy_type, limit)
+		tunnels, user_uuid, err = Tunnels(ctx, logger, client, country, proxy_type, limit, timeout, backoffInitial, backoffDeadline)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Transaction error: %v. Retrying with the fallback mechanism...\n", err)
 			return false
@@ -294,10 +298,10 @@ func copyBody(wr io.Writer, body io.Reader) {
 	}
 }
 
-func RandRange(low, hi float64) float64 {
+func RandRange(low, hi int64) int64 {
 	if low >= hi {
 		panic("RandRange: low boundary is greater or equal to high boundary")
 	}
 	delta := hi - low
-	return low + rand.New(RandomSource).Float64()*delta
+	return low + rand.New(RandomSource).Int63n(delta+1)
 }