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4 files changed, 0 insertions, 920 deletions

diff --git a/vendor/github.com/hashicorp/go-retryablehttp/LICENSE b/vendor/github.com/hashicorp/go-retryablehttp/LICENSE
deleted file mode 100644
index e87a115..0000000
--- a/vendor/github.com/hashicorp/go-retryablehttp/LICENSE
+++ /dev/null
@@ -1,363 +0,0 @@
-Mozilla Public License, version 2.0
-
-1. Definitions
-
-1.1. "Contributor"
-
-     means each individual or legal entity that creates, contributes to the
-     creation of, or owns Covered Software.
-
-1.2. "Contributor Version"
-
-     means the combination of the Contributions of others (if any) used by a
-     Contributor and that particular Contributor's Contribution.
-
-1.3. "Contribution"
-
-     means Covered Software of a particular Contributor.
-
-1.4. "Covered Software"
-
-     means Source Code Form to which the initial Contributor has attached the
-     notice in Exhibit A, the Executable Form of such Source Code Form, and
-     Modifications of such Source Code Form, in each case including portions
-     thereof.
-
-1.5. "Incompatible With Secondary Licenses"
-     means
-
-     a. that the initial Contributor has attached the notice described in
-        Exhibit B to the Covered Software; or
-
-     b. that the Covered Software was made available under the terms of
-        version 1.1 or earlier of the License, but not also under the terms of
-        a Secondary License.
-
-1.6. "Executable Form"
-
-     means any form of the work other than Source Code Form.
-
-1.7. "Larger Work"
-
-     means a work that combines Covered Software with other material, in a
-     separate file or files, that is not Covered Software.
-
-1.8. "License"
-
-     means this document.
-
-1.9. "Licensable"
-
-     means having the right to grant, to the maximum extent possible, whether
-     at the time of the initial grant or subsequently, any and all of the
-     rights conveyed by this License.
-
-1.10. "Modifications"
-
-     means any of the following:
-
-     a. any file in Source Code Form that results from an addition to,
-        deletion from, or modification of the contents of Covered Software; or
-
-     b. any new file in Source Code Form that contains any Covered Software.
-
-1.11. "Patent Claims" of a Contributor
-
-      means any patent claim(s), including without limitation, method,
-      process, and apparatus claims, in any patent Licensable by such
-      Contributor that would be infringed, but for the grant of the License,
-      by the making, using, selling, offering for sale, having made, import,
-      or transfer of either its Contributions or its Contributor Version.
-
-1.12. "Secondary License"
-
-      means either the GNU General Public License, Version 2.0, the GNU Lesser
-      General Public License, Version 2.1, the GNU Affero General Public
-      License, Version 3.0, or any later versions of those licenses.
-
-1.13. "Source Code Form"
-
-      means the form of the work preferred for making modifications.
-
-1.14. "You" (or "Your")
-
-      means an individual or a legal entity exercising rights under this
-      License. For legal entities, "You" includes any entity that controls, is
-      controlled by, or is under common control with You. For purposes of this
-      definition, "control" means (a) the power, direct or indirect, to cause
-      the direction or management of such entity, whether by contract or
-      otherwise, or (b) ownership of more than fifty percent (50%) of the
-      outstanding shares or beneficial ownership of such entity.
-
-
-2. License Grants and Conditions
-
-2.1. Grants
-
-     Each Contributor hereby grants You a world-wide, royalty-free,
-     non-exclusive license:
-
-     a. under intellectual property rights (other than patent or trademark)
-        Licensable by such Contributor to use, reproduce, make available,
-        modify, display, perform, distribute, and otherwise exploit its
-        Contributions, either on an unmodified basis, with Modifications, or
-        as part of a Larger Work; and
-
-     b. under Patent Claims of such Contributor to make, use, sell, offer for
-        sale, have made, import, and otherwise transfer either its
-        Contributions or its Contributor Version.
-
-2.2. Effective Date
-
-     The licenses granted in Section 2.1 with respect to any Contribution
-     become effective for each Contribution on the date the Contributor first
-     distributes such Contribution.
-
-2.3. Limitations on Grant Scope
-
-     The licenses granted in this Section 2 are the only rights granted under
-     this License. No additional rights or licenses will be implied from the
-     distribution or licensing of Covered Software under this License.
-     Notwithstanding Section 2.1(b) above, no patent license is granted by a
-     Contributor:
-
-     a. for any code that a Contributor has removed from Covered Software; or
-
-     b. for infringements caused by: (i) Your and any other third party's
-        modifications of Covered Software, or (ii) the combination of its
-        Contributions with other software (except as part of its Contributor
-        Version); or
-
-     c. under Patent Claims infringed by Covered Software in the absence of
-        its Contributions.
-
-     This License does not grant any rights in the trademarks, service marks,
-     or logos of any Contributor (except as may be necessary to comply with
-     the notice requirements in Section 3.4).
-
-2.4. Subsequent Licenses
-
-     No Contributor makes additional grants as a result of Your choice to
-     distribute the Covered Software under a subsequent version of this
-     License (see Section 10.2) or under the terms of a Secondary License (if
-     permitted under the terms of Section 3.3).
-
-2.5. Representation
-
-     Each Contributor represents that the Contributor believes its
-     Contributions are its original creation(s) or it has sufficient rights to
-     grant the rights to its Contributions conveyed by this License.
-
-2.6. Fair Use
-
-     This License is not intended to limit any rights You have under
-     applicable copyright doctrines of fair use, fair dealing, or other
-     equivalents.
-
-2.7. Conditions
-
-     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
-     Section 2.1.
-
-
-3. Responsibilities
-
-3.1. Distribution of Source Form
-
-     All distribution of Covered Software in Source Code Form, including any
-     Modifications that You create or to which You contribute, must be under
-     the terms of this License. You must inform recipients that the Source
-     Code Form of the Covered Software is governed by the terms of this
-     License, and how they can obtain a copy of this License. You may not
-     attempt to alter or restrict the recipients' rights in the Source Code
-     Form.
-
-3.2. Distribution of Executable Form
-
-     If You distribute Covered Software in Executable Form then:
-
-     a. such Covered Software must also be made available in Source Code Form,
-        as described in Section 3.1, and You must inform recipients of the
-        Executable Form how they can obtain a copy of such Source Code Form by
-        reasonable means in a timely manner, at a charge no more than the cost
-        of distribution to the recipient; and
-
-     b. You may distribute such Executable Form under the terms of this
-        License, or sublicense it under different terms, provided that the
-        license for the Executable Form does not attempt to limit or alter the
-        recipients' rights in the Source Code Form under this License.
-
-3.3. Distribution of a Larger Work
-
-     You may create and distribute a Larger Work under terms of Your choice,
-     provided that You also comply with the requirements of this License for
-     the Covered Software. If the Larger Work is a combination of Covered
-     Software with a work governed by one or more Secondary Licenses, and the
-     Covered Software is not Incompatible With Secondary Licenses, this
-     License permits You to additionally distribute such Covered Software
-     under the terms of such Secondary License(s), so that the recipient of
-     the Larger Work may, at their option, further distribute the Covered
-     Software under the terms of either this License or such Secondary
-     License(s).
-
-3.4. Notices
-
-     You may not remove or alter the substance of any license notices
-     (including copyright notices, patent notices, disclaimers of warranty, or
-     limitations of liability) contained within the Source Code Form of the
-     Covered Software, except that You may alter any license notices to the
-     extent required to remedy known factual inaccuracies.
-
-3.5. Application of Additional Terms
-
-     You may choose to offer, and to charge a fee for, warranty, support,
-     indemnity or liability obligations to one or more recipients of Covered
-     Software. However, You may do so only on Your own behalf, and not on
-     behalf of any Contributor. You must make it absolutely clear that any
-     such warranty, support, indemnity, or liability obligation is offered by
-     You alone, and You hereby agree to indemnify every Contributor for any
-     liability incurred by such Contributor as a result of warranty, support,
-     indemnity or liability terms You offer. You may include additional
-     disclaimers of warranty and limitations of liability specific to any
-     jurisdiction.
-
-4. Inability to Comply Due to Statute or Regulation
-
-   If it is impossible for You to comply with any of the terms of this License
-   with respect to some or all of the Covered Software due to statute,
-   judicial order, or regulation then You must: (a) comply with the terms of
-   this License to the maximum extent possible; and (b) describe the
-   limitations and the code they affect. Such description must be placed in a
-   text file included with all distributions of the Covered Software under
-   this License. Except to the extent prohibited by statute or regulation,
-   such description must be sufficiently detailed for a recipient of ordinary
-   skill to be able to understand it.
-
-5. Termination
-
-5.1. The rights granted under this License will terminate automatically if You
-     fail to comply with any of its terms. However, if You become compliant,
-     then the rights granted under this License from a particular Contributor
-     are reinstated (a) provisionally, unless and until such Contributor
-     explicitly and finally terminates Your grants, and (b) on an ongoing
-     basis, if such Contributor fails to notify You of the non-compliance by
-     some reasonable means prior to 60 days after You have come back into
-     compliance. Moreover, Your grants from a particular Contributor are
-     reinstated on an ongoing basis if such Contributor notifies You of the
-     non-compliance by some reasonable means, this is the first time You have
-     received notice of non-compliance with this License from such
-     Contributor, and You become compliant prior to 30 days after Your receipt
-     of the notice.
-
-5.2. If You initiate litigation against any entity by asserting a patent
-     infringement claim (excluding declaratory judgment actions,
-     counter-claims, and cross-claims) alleging that a Contributor Version
-     directly or indirectly infringes any patent, then the rights granted to
-     You by any and all Contributors for the Covered Software under Section
-     2.1 of this License shall terminate.
-
-5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
-     license agreements (excluding distributors and resellers) which have been
-     validly granted by You or Your distributors under this License prior to
-     termination shall survive termination.
-
-6. Disclaimer of Warranty
-
-   Covered Software is provided under this License on an "as is" basis,
-   without warranty of any kind, either expressed, implied, or statutory,
-   including, without limitation, warranties that the Covered Software is free
-   of defects, merchantable, fit for a particular purpose or non-infringing.
-   The entire risk as to the quality and performance of the Covered Software
-   is with You. Should any Covered Software prove defective in any respect,
-   You (not any Contributor) assume the cost of any necessary servicing,
-   repair, or correction. This disclaimer of warranty constitutes an essential
-   part of this License. No use of  any Covered Software is authorized under
-   this License except under this disclaimer.
-
-7. Limitation of Liability
-
-   Under no circumstances and under no legal theory, whether tort (including
-   negligence), contract, or otherwise, shall any Contributor, or anyone who
-   distributes Covered Software as permitted above, be liable to You for any
-   direct, indirect, special, incidental, or consequential damages of any
-   character including, without limitation, damages for lost profits, loss of
-   goodwill, work stoppage, computer failure or malfunction, or any and all
-   other commercial damages or losses, even if such party shall have been
-   informed of the possibility of such damages. This limitation of liability
-   shall not apply to liability for death or personal injury resulting from
-   such party's negligence to the extent applicable law prohibits such
-   limitation. Some jurisdictions do not allow the exclusion or limitation of
-   incidental or consequential damages, so this exclusion and limitation may
-   not apply to You.
-
-8. Litigation
-
-   Any litigation relating to this License may be brought only in the courts
-   of a jurisdiction where the defendant maintains its principal place of
-   business and such litigation shall be governed by laws of that
-   jurisdiction, without reference to its conflict-of-law provisions. Nothing
-   in this Section shall prevent a party's ability to bring cross-claims or
-   counter-claims.
-
-9. Miscellaneous
-
-   This License represents the complete agreement concerning the subject
-   matter hereof. If any provision of this License is held to be
-   unenforceable, such provision shall be reformed only to the extent
-   necessary to make it enforceable. Any law or regulation which provides that
-   the language of a contract shall be construed against the drafter shall not
-   be used to construe this License against a Contributor.
-
-
-10. Versions of the License
-
-10.1. New Versions
-
-      Mozilla Foundation is the license steward. Except as provided in Section
-      10.3, no one other than the license steward has the right to modify or
-      publish new versions of this License. Each version will be given a
-      distinguishing version number.
-
-10.2. Effect of New Versions
-
-      You may distribute the Covered Software under the terms of the version
-      of the License under which You originally received the Covered Software,
-      or under the terms of any subsequent version published by the license
-      steward.
-
-10.3. Modified Versions
-
-      If you create software not governed by this License, and you want to
-      create a new license for such software, you may create and use a
-      modified version of this License if you rename the license and remove
-      any references to the name of the license steward (except to note that
-      such modified license differs from this License).
-
-10.4. Distributing Source Code Form that is Incompatible With Secondary
-      Licenses If You choose to distribute Source Code Form that is
-      Incompatible With Secondary Licenses under the terms of this version of
-      the License, the notice described in Exhibit B of this License must be
-      attached.
-
-Exhibit A - Source Code Form License Notice
-
-      This Source Code Form is subject to the
-      terms of the Mozilla Public License, v.
-      2.0. If a copy of the MPL was not
-      distributed with this file, You can
-      obtain one at
-      http://mozilla.org/MPL/2.0/.
-
-If it is not possible or desirable to put the notice in a particular file,
-then You may include the notice in a location (such as a LICENSE file in a
-relevant directory) where a recipient would be likely to look for such a
-notice.
-
-You may add additional accurate notices of copyright ownership.
-
-Exhibit B - "Incompatible With Secondary Licenses" Notice
-
-      This Source Code Form is "Incompatible
-      With Secondary Licenses", as defined by
-      the Mozilla Public License, v. 2.0.
-
diff --git a/vendor/github.com/hashicorp/go-retryablehttp/Makefile b/vendor/github.com/hashicorp/go-retryablehttp/Makefile
deleted file mode 100644
index da17640..0000000
--- a/vendor/github.com/hashicorp/go-retryablehttp/Makefile
+++ /dev/null
@@ -1,11 +0,0 @@
-default: test
-
-test:
-	go vet ./...
-	go test -race ./...
-
-updatedeps:
-	go get -f -t -u ./...
-	go get -f -u ./...
-
-.PHONY: default test updatedeps
diff --git a/vendor/github.com/hashicorp/go-retryablehttp/README.md b/vendor/github.com/hashicorp/go-retryablehttp/README.md
deleted file mode 100644
index ccdc7e8..0000000
--- a/vendor/github.com/hashicorp/go-retryablehttp/README.md
+++ /dev/null
@@ -1,46 +0,0 @@
-go-retryablehttp
-================
-
-[![Build Status](http://img.shields.io/travis/hashicorp/go-retryablehttp.svg?style=flat-square)][travis]
-[![Go Documentation](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)][godocs]
-
-[travis]: http://travis-ci.org/hashicorp/go-retryablehttp
-[godocs]: http://godoc.org/github.com/hashicorp/go-retryablehttp
-
-The `retryablehttp` package provides a familiar HTTP client interface with
-automatic retries and exponential backoff. It is a thin wrapper over the
-standard `net/http` client library and exposes nearly the same public API. This
-makes `retryablehttp` very easy to drop into existing programs.
-
-`retryablehttp` performs automatic retries under certain conditions. Mainly, if
-an error is returned by the client (connection errors, etc.), or if a 500-range
-response code is received (except 501), then a retry is invoked after a wait
-period.  Otherwise, the response is returned and left to the caller to
-interpret.
-
-The main difference from `net/http` is that requests which take a request body
-(POST/PUT et. al) can have the body provided in a number of ways (some more or
-less efficient) that allow "rewinding" the request body if the initial request
-fails so that the full request can be attempted again. See the
-[godoc](http://godoc.org/github.com/hashicorp/go-retryablehttp) for more
-details.
-
-Example Use
-===========
-
-Using this library should look almost identical to what you would do with
-`net/http`. The most simple example of a GET request is shown below:
-
-```go
-resp, err := retryablehttp.Get("/foo")
-if err != nil {
-    panic(err)
-}
-```
-
-The returned response object is an `*http.Response`, the same thing you would
-usually get from `net/http`. Had the request failed one or more times, the above
-call would block and retry with exponential backoff.
-
-For more usage and examples see the
-[godoc](http://godoc.org/github.com/hashicorp/go-retryablehttp).
diff --git a/vendor/github.com/hashicorp/go-retryablehttp/client.go b/vendor/github.com/hashicorp/go-retryablehttp/client.go
deleted file mode 100644
index 21f45e5..0000000
--- a/vendor/github.com/hashicorp/go-retryablehttp/client.go
+++ /dev/null
@@ -1,500 +0,0 @@
-// The retryablehttp package provides a familiar HTTP client interface with
-// automatic retries and exponential backoff. It is a thin wrapper over the
-// standard net/http client library and exposes nearly the same public API.
-// This makes retryablehttp very easy to drop into existing programs.
-//
-// retryablehttp performs automatic retries under certain conditions. Mainly, if
-// an error is returned by the client (connection errors etc), or if a 500-range
-// response is received, then a retry is invoked. Otherwise, the response is
-// returned and left to the caller to interpret.
-//
-// Requests which take a request body should provide a non-nil function
-// parameter. The best choice is to provide either a function satisfying
-// ReaderFunc which provides multiple io.Readers in an efficient manner, a
-// *bytes.Buffer (the underlying raw byte slice will be used) or a raw byte
-// slice. As it is a reference type, and we will wrap it as needed by readers,
-// we can efficiently re-use the request body without needing to copy it. If an
-// io.Reader (such as a *bytes.Reader) is provided, the full body will be read
-// prior to the first request, and will be efficiently re-used for any retries.
-// ReadSeeker can be used, but some users have observed occasional data races
-// between the net/http library and the Seek functionality of some
-// implementations of ReadSeeker, so should be avoided if possible.
-package retryablehttp
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"log"
-	"math"
-	"math/rand"
-	"net/http"
-	"net/url"
-	"os"
-	"strings"
-	"time"
-
-	"github.com/hashicorp/go-cleanhttp"
-)
-
-var (
-	// Default retry configuration
-	defaultRetryWaitMin = 1 * time.Second
-	defaultRetryWaitMax = 30 * time.Second
-	defaultRetryMax     = 4
-
-	// defaultClient is used for performing requests without explicitly making
-	// a new client. It is purposely private to avoid modifications.
-	defaultClient = NewClient()
-
-	// We need to consume response bodies to maintain http connections, but
-	// limit the size we consume to respReadLimit.
-	respReadLimit = int64(4096)
-)
-
-// ReaderFunc is the type of function that can be given natively to NewRequest
-type ReaderFunc func() (io.Reader, error)
-
-// LenReader is an interface implemented by many in-memory io.Reader's. Used
-// for automatically sending the right Content-Length header when possible.
-type LenReader interface {
-	Len() int
-}
-
-// Request wraps the metadata needed to create HTTP requests.
-type Request struct {
-	// body is a seekable reader over the request body payload. This is
-	// used to rewind the request data in between retries.
-	body ReaderFunc
-
-	// Embed an HTTP request directly. This makes a *Request act exactly
-	// like an *http.Request so that all meta methods are supported.
-	*http.Request
-}
-
-// WithContext returns wrapped Request with a shallow copy of underlying *http.Request
-// with its context changed to ctx. The provided ctx must be non-nil.
-func (r *Request) WithContext(ctx context.Context) *Request {
-	r.Request = r.Request.WithContext(ctx)
-	return r
-}
-
-// NewRequest creates a new wrapped request.
-func NewRequest(method, url string, rawBody interface{}) (*Request, error) {
-	var err error
-	var body ReaderFunc
-	var contentLength int64
-
-	if rawBody != nil {
-		switch rawBody.(type) {
-		// If they gave us a function already, great! Use it.
-		case ReaderFunc:
-			body = rawBody.(ReaderFunc)
-			tmp, err := body()
-			if err != nil {
-				return nil, err
-			}
-			if lr, ok := tmp.(LenReader); ok {
-				contentLength = int64(lr.Len())
-			}
-			if c, ok := tmp.(io.Closer); ok {
-				c.Close()
-			}
-
-		case func() (io.Reader, error):
-			body = rawBody.(func() (io.Reader, error))
-			tmp, err := body()
-			if err != nil {
-				return nil, err
-			}
-			if lr, ok := tmp.(LenReader); ok {
-				contentLength = int64(lr.Len())
-			}
-			if c, ok := tmp.(io.Closer); ok {
-				c.Close()
-			}
-
-		// If a regular byte slice, we can read it over and over via new
-		// readers
-		case []byte:
-			buf := rawBody.([]byte)
-			body = func() (io.Reader, error) {
-				return bytes.NewReader(buf), nil
-			}
-			contentLength = int64(len(buf))
-
-		// If a bytes.Buffer we can read the underlying byte slice over and
-		// over
-		case *bytes.Buffer:
-			buf := rawBody.(*bytes.Buffer)
-			body = func() (io.Reader, error) {
-				return bytes.NewReader(buf.Bytes()), nil
-			}
-			contentLength = int64(buf.Len())
-
-		// We prioritize *bytes.Reader here because we don't really want to
-		// deal with it seeking so want it to match here instead of the
-		// io.ReadSeeker case.
-		case *bytes.Reader:
-			buf, err := ioutil.ReadAll(rawBody.(*bytes.Reader))
-			if err != nil {
-				return nil, err
-			}
-			body = func() (io.Reader, error) {
-				return bytes.NewReader(buf), nil
-			}
-			contentLength = int64(len(buf))
-
-		// Compat case
-		case io.ReadSeeker:
-			raw := rawBody.(io.ReadSeeker)
-			body = func() (io.Reader, error) {
-				raw.Seek(0, 0)
-				return ioutil.NopCloser(raw), nil
-			}
-			if lr, ok := raw.(LenReader); ok {
-				contentLength = int64(lr.Len())
-			}
-
-		// Read all in so we can reset
-		case io.Reader:
-			buf, err := ioutil.ReadAll(rawBody.(io.Reader))
-			if err != nil {
-				return nil, err
-			}
-			body = func() (io.Reader, error) {
-				return bytes.NewReader(buf), nil
-			}
-			contentLength = int64(len(buf))
-
-		default:
-			return nil, fmt.Errorf("cannot handle type %T", rawBody)
-		}
-	}
-
-	httpReq, err := http.NewRequest(method, url, nil)
-	if err != nil {
-		return nil, err
-	}
-	httpReq.ContentLength = contentLength
-
-	return &Request{body, httpReq}, nil
-}
-
-// RequestLogHook allows a function to run before each retry. The HTTP
-// request which will be made, and the retry number (0 for the initial
-// request) are available to users. The internal logger is exposed to
-// consumers.
-type RequestLogHook func(*log.Logger, *http.Request, int)
-
-// ResponseLogHook is like RequestLogHook, but allows running a function
-// on each HTTP response. This function will be invoked at the end of
-// every HTTP request executed, regardless of whether a subsequent retry
-// needs to be performed or not. If the response body is read or closed
-// from this method, this will affect the response returned from Do().
-type ResponseLogHook func(*log.Logger, *http.Response)
-
-// CheckRetry specifies a policy for handling retries. It is called
-// following each request with the response and error values returned by
-// the http.Client. If CheckRetry returns false, the Client stops retrying
-// and returns the response to the caller. If CheckRetry returns an error,
-// that error value is returned in lieu of the error from the request. The
-// Client will close any response body when retrying, but if the retry is
-// aborted it is up to the CheckResponse callback to properly close any
-// response body before returning.
-type CheckRetry func(ctx context.Context, resp *http.Response, err error) (bool, error)
-
-// Backoff specifies a policy for how long to wait between retries.
-// It is called after a failing request to determine the amount of time
-// that should pass before trying again.
-type Backoff func(min, max time.Duration, attemptNum int, resp *http.Response) time.Duration
-
-// ErrorHandler is called if retries are expired, containing the last status
-// from the http library. If not specified, default behavior for the library is
-// to close the body and return an error indicating how many tries were
-// attempted. If overriding this, be sure to close the body if needed.
-type ErrorHandler func(resp *http.Response, err error, numTries int) (*http.Response, error)
-
-// Client is used to make HTTP requests. It adds additional functionality
-// like automatic retries to tolerate minor outages.
-type Client struct {
-	HTTPClient *http.Client // Internal HTTP client.
-	Logger     *log.Logger  // Customer logger instance.
-
-	RetryWaitMin time.Duration // Minimum time to wait
-	RetryWaitMax time.Duration // Maximum time to wait
-	RetryMax     int           // Maximum number of retries
-
-	// RequestLogHook allows a user-supplied function to be called
-	// before each retry.
-	RequestLogHook RequestLogHook
-
-	// ResponseLogHook allows a user-supplied function to be called
-	// with the response from each HTTP request executed.
-	ResponseLogHook ResponseLogHook
-
-	// CheckRetry specifies the policy for handling retries, and is called
-	// after each request. The default policy is DefaultRetryPolicy.
-	CheckRetry CheckRetry
-
-	// Backoff specifies the policy for how long to wait between retries
-	Backoff Backoff
-
-	// ErrorHandler specifies the custom error handler to use, if any
-	ErrorHandler ErrorHandler
-}
-
-// NewClient creates a new Client with default settings.
-func NewClient() *Client {
-	return &Client{
-		HTTPClient:   cleanhttp.DefaultClient(),
-		Logger:       log.New(os.Stderr, "", log.LstdFlags),
-		RetryWaitMin: defaultRetryWaitMin,
-		RetryWaitMax: defaultRetryWaitMax,
-		RetryMax:     defaultRetryMax,
-		CheckRetry:   DefaultRetryPolicy,
-		Backoff:      DefaultBackoff,
-	}
-}
-
-// DefaultRetryPolicy provides a default callback for Client.CheckRetry, which
-// will retry on connection errors and server errors.
-func DefaultRetryPolicy(ctx context.Context, resp *http.Response, err error) (bool, error) {
-	// do not retry on context.Canceled or context.DeadlineExceeded
-	if ctx.Err() != nil {
-		return false, ctx.Err()
-	}
-
-	if err != nil {
-		return true, err
-	}
-	// Check the response code. We retry on 500-range responses to allow
-	// the server time to recover, as 500's are typically not permanent
-	// errors and may relate to outages on the server side. This will catch
-	// invalid response codes as well, like 0 and 999.
-	if resp.StatusCode == 0 || (resp.StatusCode >= 500 && resp.StatusCode != 501) {
-		return true, nil
-	}
-
-	return false, nil
-}
-
-// DefaultBackoff provides a default callback for Client.Backoff which
-// will perform exponential backoff based on the attempt number and limited
-// by the provided minimum and maximum durations.
-func DefaultBackoff(min, max time.Duration, attemptNum int, resp *http.Response) time.Duration {
-	mult := math.Pow(2, float64(attemptNum)) * float64(min)
-	sleep := time.Duration(mult)
-	if float64(sleep) != mult || sleep > max {
-		sleep = max
-	}
-	return sleep
-}
-
-// LinearJitterBackoff provides a callback for Client.Backoff which will
-// perform linear backoff based on the attempt number and with jitter to
-// prevent a thundering herd.
-//
-// min and max here are *not* absolute values. The number to be multipled by
-// the attempt number will be chosen at random from between them, thus they are
-// bounding the jitter.
-//
-// For instance:
-// * To get strictly linear backoff of one second increasing each retry, set
-// both to one second (1s, 2s, 3s, 4s, ...)
-// * To get a small amount of jitter centered around one second increasing each
-// retry, set to around one second, such as a min of 800ms and max of 1200ms
-// (892ms, 2102ms, 2945ms, 4312ms, ...)
-// * To get extreme jitter, set to a very wide spread, such as a min of 100ms
-// and a max of 20s (15382ms, 292ms, 51321ms, 35234ms, ...)
-func LinearJitterBackoff(min, max time.Duration, attemptNum int, resp *http.Response) time.Duration {
-	// attemptNum always starts at zero but we want to start at 1 for multiplication
-	attemptNum++
-
-	if max <= min {
-		// Unclear what to do here, or they are the same, so return min *
-		// attemptNum
-		return min * time.Duration(attemptNum)
-	}
-
-	// Seed rand; doing this every time is fine
-	rand := rand.New(rand.NewSource(int64(time.Now().Nanosecond())))
-
-	// Pick a random number that lies somewhere between the min and max and
-	// multiply by the attemptNum. attemptNum starts at zero so we always
-	// increment here. We first get a random percentage, then apply that to the
-	// difference between min and max, and add to min.
-	jitter := rand.Float64() * float64(max-min)
-	jitterMin := int64(jitter) + int64(min)
-	return time.Duration(jitterMin * int64(attemptNum))
-}
-
-// PassthroughErrorHandler is an ErrorHandler that directly passes through the
-// values from the net/http library for the final request. The body is not
-// closed.
-func PassthroughErrorHandler(resp *http.Response, err error, _ int) (*http.Response, error) {
-	return resp, err
-}
-
-// Do wraps calling an HTTP method with retries.
-func (c *Client) Do(req *Request) (*http.Response, error) {
-	if c.Logger != nil {
-		c.Logger.Printf("[DEBUG] %s %s", req.Method, req.URL)
-	}
-
-	var resp *http.Response
-	var err error
-
-	for i := 0; ; i++ {
-		var code int // HTTP response code
-
-		// Always rewind the request body when non-nil.
-		if req.body != nil {
-			body, err := req.body()
-			if err != nil {
-				return resp, err
-			}
-			if c, ok := body.(io.ReadCloser); ok {
-				req.Request.Body = c
-			} else {
-				req.Request.Body = ioutil.NopCloser(body)
-			}
-		}
-
-		if c.RequestLogHook != nil {
-			c.RequestLogHook(c.Logger, req.Request, i)
-		}
-
-		// Attempt the request
-		resp, err = c.HTTPClient.Do(req.Request)
-		if resp != nil {
-			code = resp.StatusCode
-		}
-
-		// Check if we should continue with retries.
-		checkOK, checkErr := c.CheckRetry(req.Request.Context(), resp, err)
-
-		if err != nil {
-			if c.Logger != nil {
-				c.Logger.Printf("[ERR] %s %s request failed: %v", req.Method, req.URL, err)
-			}
-		} else {
-			// Call this here to maintain the behavior of logging all requests,
-			// even if CheckRetry signals to stop.
-			if c.ResponseLogHook != nil {
-				// Call the response logger function if provided.
-				c.ResponseLogHook(c.Logger, resp)
-			}
-		}
-
-		// Now decide if we should continue.
-		if !checkOK {
-			if checkErr != nil {
-				err = checkErr
-			}
-			return resp, err
-		}
-
-		// We do this before drainBody beause there's no need for the I/O if
-		// we're breaking out
-		remain := c.RetryMax - i
-		if remain <= 0 {
-			break
-		}
-
-		// We're going to retry, consume any response to reuse the connection.
-		if err == nil && resp != nil {
-			c.drainBody(resp.Body)
-		}
-
-		wait := c.Backoff(c.RetryWaitMin, c.RetryWaitMax, i, resp)
-		desc := fmt.Sprintf("%s %s", req.Method, req.URL)
-		if code > 0 {
-			desc = fmt.Sprintf("%s (status: %d)", desc, code)
-		}
-		if c.Logger != nil {
-			c.Logger.Printf("[DEBUG] %s: retrying in %s (%d left)", desc, wait, remain)
-		}
-		time.Sleep(wait)
-	}
-
-	if c.ErrorHandler != nil {
-		return c.ErrorHandler(resp, err, c.RetryMax+1)
-	}
-
-	// By default, we close the response body and return an error without
-	// returning the response
-	if resp != nil {
-		resp.Body.Close()
-	}
-	return nil, fmt.Errorf("%s %s giving up after %d attempts",
-		req.Method, req.URL, c.RetryMax+1)
-}
-
-// Try to read the response body so we can reuse this connection.
-func (c *Client) drainBody(body io.ReadCloser) {
-	defer body.Close()
-	_, err := io.Copy(ioutil.Discard, io.LimitReader(body, respReadLimit))
-	if err != nil {
-		if c.Logger != nil {
-			c.Logger.Printf("[ERR] error reading response body: %v", err)
-		}
-	}
-}
-
-// Get is a shortcut for doing a GET request without making a new client.
-func Get(url string) (*http.Response, error) {
-	return defaultClient.Get(url)
-}
-
-// Get is a convenience helper for doing simple GET requests.
-func (c *Client) Get(url string) (*http.Response, error) {
-	req, err := NewRequest("GET", url, nil)
-	if err != nil {
-		return nil, err
-	}
-	return c.Do(req)
-}
-
-// Head is a shortcut for doing a HEAD request without making a new client.
-func Head(url string) (*http.Response, error) {
-	return defaultClient.Head(url)
-}
-
-// Head is a convenience method for doing simple HEAD requests.
-func (c *Client) Head(url string) (*http.Response, error) {
-	req, err := NewRequest("HEAD", url, nil)
-	if err != nil {
-		return nil, err
-	}
-	return c.Do(req)
-}
-
-// Post is a shortcut for doing a POST request without making a new client.
-func Post(url, bodyType string, body interface{}) (*http.Response, error) {
-	return defaultClient.Post(url, bodyType, body)
-}
-
-// Post is a convenience method for doing simple POST requests.
-func (c *Client) Post(url, bodyType string, body interface{}) (*http.Response, error) {
-	req, err := NewRequest("POST", url, body)
-	if err != nil {
-		return nil, err
-	}
-	req.Header.Set("Content-Type", bodyType)
-	return c.Do(req)
-}
-
-// PostForm is a shortcut to perform a POST with form data without creating
-// a new client.
-func PostForm(url string, data url.Values) (*http.Response, error) {
-	return defaultClient.PostForm(url, data)
-}
-
-// PostForm is a convenience method for doing simple POST operations using
-// pre-filled url.Values form data.
-func (c *Client) PostForm(url string, data url.Values) (*http.Response, error) {
-	return c.Post(url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
-}