Add go-retryablehttp dep
This commit is contained in:
Jeff Mitchell
parent
7023eafc67
commit
4146ebed9c
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Mozilla Public License, version 2.0
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1. Definitions
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1.1. "Contributor"
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means each individual or legal entity that creates, contributes to the
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creation of, or owns Covered Software.
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1.2. "Contributor Version"
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means the combination of the Contributions of others (if any) used by a
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Contributor and that particular Contributor's Contribution.
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1.3. "Contribution"
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means Covered Software of a particular Contributor.
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1.4. "Covered Software"
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means Source Code Form to which the initial Contributor has attached the
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notice in Exhibit A, the Executable Form of such Source Code Form, and
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Modifications of such Source Code Form, in each case including portions
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thereof.
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1.5. "Incompatible With Secondary Licenses"
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means
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a. that the initial Contributor has attached the notice described in
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Exhibit B to the Covered Software; or
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b. that the Covered Software was made available under the terms of
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version 1.1 or earlier of the License, but not also under the terms of
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a Secondary License.
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1.6. "Executable Form"
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means any form of the work other than Source Code Form.
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1.7. "Larger Work"
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means a work that combines Covered Software with other material, in a
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separate file or files, that is not Covered Software.
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1.8. "License"
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means this document.
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1.9. "Licensable"
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means having the right to grant, to the maximum extent possible, whether
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at the time of the initial grant or subsequently, any and all of the
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rights conveyed by this License.
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1.10. "Modifications"
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means any of the following:
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a. any file in Source Code Form that results from an addition to,
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deletion from, or modification of the contents of Covered Software; or
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b. any new file in Source Code Form that contains any Covered Software.
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1.11. "Patent Claims" of a Contributor
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means any patent claim(s), including without limitation, method,
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process, and apparatus claims, in any patent Licensable by such
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Contributor that would be infringed, but for the grant of the License,
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by the making, using, selling, offering for sale, having made, import,
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or transfer of either its Contributions or its Contributor Version.
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1.12. "Secondary License"
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means either the GNU General Public License, Version 2.0, the GNU Lesser
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General Public License, Version 2.1, the GNU Affero General Public
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License, Version 3.0, or any later versions of those licenses.
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1.13. "Source Code Form"
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means the form of the work preferred for making modifications.
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1.14. "You" (or "Your")
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means an individual or a legal entity exercising rights under this
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License. For legal entities, "You" includes any entity that controls, is
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controlled by, or is under common control with You. For purposes of this
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definition, "control" means (a) the power, direct or indirect, to cause
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the direction or management of such entity, whether by contract or
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otherwise, or (b) ownership of more than fifty percent (50%) of the
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outstanding shares or beneficial ownership of such entity.
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2. License Grants and Conditions
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2.1. Grants
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Each Contributor hereby grants You a world-wide, royalty-free,
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non-exclusive license:
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a. under intellectual property rights (other than patent or trademark)
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Licensable by such Contributor to use, reproduce, make available,
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modify, display, perform, distribute, and otherwise exploit its
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Contributions, either on an unmodified basis, with Modifications, or
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as part of a Larger Work; and
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b. under Patent Claims of such Contributor to make, use, sell, offer for
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sale, have made, import, and otherwise transfer either its
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Contributions or its Contributor Version.
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2.2. Effective Date
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The licenses granted in Section 2.1 with respect to any Contribution
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become effective for each Contribution on the date the Contributor first
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distributes such Contribution.
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2.3. Limitations on Grant Scope
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The licenses granted in this Section 2 are the only rights granted under
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this License. No additional rights or licenses will be implied from the
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distribution or licensing of Covered Software under this License.
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Notwithstanding Section 2.1(b) above, no patent license is granted by a
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Contributor:
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a. for any code that a Contributor has removed from Covered Software; or
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b. for infringements caused by: (i) Your and any other third party's
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modifications of Covered Software, or (ii) the combination of its
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Contributions with other software (except as part of its Contributor
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Version); or
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c. under Patent Claims infringed by Covered Software in the absence of
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its Contributions.
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This License does not grant any rights in the trademarks, service marks,
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or logos of any Contributor (except as may be necessary to comply with
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the notice requirements in Section 3.4).
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2.4. Subsequent Licenses
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No Contributor makes additional grants as a result of Your choice to
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distribute the Covered Software under a subsequent version of this
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License (see Section 10.2) or under the terms of a Secondary License (if
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permitted under the terms of Section 3.3).
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2.5. Representation
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Each Contributor represents that the Contributor believes its
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Contributions are its original creation(s) or it has sufficient rights to
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grant the rights to its Contributions conveyed by this License.
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2.6. Fair Use
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This License is not intended to limit any rights You have under
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applicable copyright doctrines of fair use, fair dealing, or other
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equivalents.
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2.7. Conditions
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Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
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Section 2.1.
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3. Responsibilities
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3.1. Distribution of Source Form
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All distribution of Covered Software in Source Code Form, including any
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Modifications that You create or to which You contribute, must be under
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the terms of this License. You must inform recipients that the Source
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Code Form of the Covered Software is governed by the terms of this
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License, and how they can obtain a copy of this License. You may not
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attempt to alter or restrict the recipients' rights in the Source Code
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Form.
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3.2. Distribution of Executable Form
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If You distribute Covered Software in Executable Form then:
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a. such Covered Software must also be made available in Source Code Form,
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as described in Section 3.1, and You must inform recipients of the
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Executable Form how they can obtain a copy of such Source Code Form by
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reasonable means in a timely manner, at a charge no more than the cost
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of distribution to the recipient; and
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b. You may distribute such Executable Form under the terms of this
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License, or sublicense it under different terms, provided that the
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license for the Executable Form does not attempt to limit or alter the
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recipients' rights in the Source Code Form under this License.
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3.3. Distribution of a Larger Work
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You may create and distribute a Larger Work under terms of Your choice,
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provided that You also comply with the requirements of this License for
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the Covered Software. If the Larger Work is a combination of Covered
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Software with a work governed by one or more Secondary Licenses, and the
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Covered Software is not Incompatible With Secondary Licenses, this
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License permits You to additionally distribute such Covered Software
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under the terms of such Secondary License(s), so that the recipient of
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the Larger Work may, at their option, further distribute the Covered
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Software under the terms of either this License or such Secondary
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License(s).
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3.4. Notices
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You may not remove or alter the substance of any license notices
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(including copyright notices, patent notices, disclaimers of warranty, or
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limitations of liability) contained within the Source Code Form of the
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Covered Software, except that You may alter any license notices to the
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extent required to remedy known factual inaccuracies.
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3.5. Application of Additional Terms
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You may choose to offer, and to charge a fee for, warranty, support,
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indemnity or liability obligations to one or more recipients of Covered
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Software. However, You may do so only on Your own behalf, and not on
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behalf of any Contributor. You must make it absolutely clear that any
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such warranty, support, indemnity, or liability obligation is offered by
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You alone, and You hereby agree to indemnify every Contributor for any
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liability incurred by such Contributor as a result of warranty, support,
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indemnity or liability terms You offer. You may include additional
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disclaimers of warranty and limitations of liability specific to any
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jurisdiction.
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4. Inability to Comply Due to Statute or Regulation
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If it is impossible for You to comply with any of the terms of this License
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with respect to some or all of the Covered Software due to statute,
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judicial order, or regulation then You must: (a) comply with the terms of
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this License to the maximum extent possible; and (b) describe the
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limitations and the code they affect. Such description must be placed in a
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text file included with all distributions of the Covered Software under
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this License. Except to the extent prohibited by statute or regulation,
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such description must be sufficiently detailed for a recipient of ordinary
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skill to be able to understand it.
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5. Termination
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5.1. The rights granted under this License will terminate automatically if You
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fail to comply with any of its terms. However, if You become compliant,
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then the rights granted under this License from a particular Contributor
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are reinstated (a) provisionally, unless and until such Contributor
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explicitly and finally terminates Your grants, and (b) on an ongoing
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basis, if such Contributor fails to notify You of the non-compliance by
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some reasonable means prior to 60 days after You have come back into
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compliance. Moreover, Your grants from a particular Contributor are
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reinstated on an ongoing basis if such Contributor notifies You of the
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non-compliance by some reasonable means, this is the first time You have
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received notice of non-compliance with this License from such
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Contributor, and You become compliant prior to 30 days after Your receipt
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of the notice.
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5.2. If You initiate litigation against any entity by asserting a patent
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infringement claim (excluding declaratory judgment actions,
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counter-claims, and cross-claims) alleging that a Contributor Version
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directly or indirectly infringes any patent, then the rights granted to
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You by any and all Contributors for the Covered Software under Section
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2.1 of this License shall terminate.
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5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
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license agreements (excluding distributors and resellers) which have been
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validly granted by You or Your distributors under this License prior to
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termination shall survive termination.
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6. Disclaimer of Warranty
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Covered Software is provided under this License on an "as is" basis,
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without warranty of any kind, either expressed, implied, or statutory,
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including, without limitation, warranties that the Covered Software is free
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of defects, merchantable, fit for a particular purpose or non-infringing.
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The entire risk as to the quality and performance of the Covered Software
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is with You. Should any Covered Software prove defective in any respect,
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You (not any Contributor) assume the cost of any necessary servicing,
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repair, or correction. This disclaimer of warranty constitutes an essential
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part of this License. No use of any Covered Software is authorized under
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this License except under this disclaimer.
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7. Limitation of Liability
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Under no circumstances and under no legal theory, whether tort (including
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negligence), contract, or otherwise, shall any Contributor, or anyone who
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distributes Covered Software as permitted above, be liable to You for any
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direct, indirect, special, incidental, or consequential damages of any
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character including, without limitation, damages for lost profits, loss of
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goodwill, work stoppage, computer failure or malfunction, or any and all
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other commercial damages or losses, even if such party shall have been
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informed of the possibility of such damages. This limitation of liability
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shall not apply to liability for death or personal injury resulting from
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such party's negligence to the extent applicable law prohibits such
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limitation. Some jurisdictions do not allow the exclusion or limitation of
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incidental or consequential damages, so this exclusion and limitation may
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not apply to You.
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8. Litigation
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Any litigation relating to this License may be brought only in the courts
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of a jurisdiction where the defendant maintains its principal place of
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business and such litigation shall be governed by laws of that
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jurisdiction, without reference to its conflict-of-law provisions. Nothing
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in this Section shall prevent a party's ability to bring cross-claims or
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counter-claims.
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9. Miscellaneous
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This License represents the complete agreement concerning the subject
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matter hereof. If any provision of this License is held to be
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unenforceable, such provision shall be reformed only to the extent
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necessary to make it enforceable. Any law or regulation which provides that
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the language of a contract shall be construed against the drafter shall not
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be used to construe this License against a Contributor.
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10. Versions of the License
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10.1. New Versions
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Mozilla Foundation is the license steward. Except as provided in Section
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10.3, no one other than the license steward has the right to modify or
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publish new versions of this License. Each version will be given a
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distinguishing version number.
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10.2. Effect of New Versions
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You may distribute the Covered Software under the terms of the version
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of the License under which You originally received the Covered Software,
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or under the terms of any subsequent version published by the license
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steward.
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10.3. Modified Versions
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If you create software not governed by this License, and you want to
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create a new license for such software, you may create and use a
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modified version of this License if you rename the license and remove
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any references to the name of the license steward (except to note that
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such modified license differs from this License).
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10.4. Distributing Source Code Form that is Incompatible With Secondary
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Licenses If You choose to distribute Source Code Form that is
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Incompatible With Secondary Licenses under the terms of this version of
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the License, the notice described in Exhibit B of this License must be
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attached.
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Exhibit A - Source Code Form License Notice
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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If it is not possible or desirable to put the notice in a particular file,
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then You may include the notice in a location (such as a LICENSE file in a
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relevant directory) where a recipient would be likely to look for such a
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notice.
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You may add additional accurate notices of copyright ownership.
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Exhibit B - "Incompatible With Secondary Licenses" Notice
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This Source Code Form is "Incompatible
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With Secondary Licenses", as defined by
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the Mozilla Public License, v. 2.0.
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@ -0,0 +1,11 @@
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default: test
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test:
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go vet ./...
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go test -race ./...
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updatedeps:
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go get -f -t -u ./...
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go get -f -u ./...
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.PHONY: default test updatedeps
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@ -0,0 +1,43 @@
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go-retryablehttp
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================
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[][travis]
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[][godocs]
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[travis]: http://travis-ci.org/hashicorp/go-retryablehttp
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[godocs]: http://godoc.org/github.com/hashicorp/go-retryablehttp
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The `retryablehttp` package provides a familiar HTTP client interface with
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automatic retries and exponential backoff. It is a thin wrapper over the
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standard `net/http` client library and exposes nearly the same public API. This
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makes `retryablehttp` very easy to drop into existing programs.
|
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`retryablehttp` performs automatic retries under certain conditions. Mainly, if
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an error is returned by the client (connection errors, etc.), or if a 500-range
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response code is received, then a retry is invoked after a wait period.
|
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Otherwise, the response is returned and left to the caller to interpret.
|
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The main difference from `net/http` is that requests which take a request body
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(POST/PUT et. al) require an `io.ReadSeeker` to be provided. This enables the
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request body to be "rewound" if the initial request fails so that the full
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request can be attempted again.
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Example Use
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===========
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Using this library should look almost identical to what you would do with
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`net/http`. The most simple example of a GET request is shown below:
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```go
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resp, err := retryablehttp.Get("/foo")
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if err != nil {
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panic(err)
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}
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```
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The returned response object is an `*http.Response`, the same thing you would
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usually get from `net/http`. Had the request failed one or more times, the above
|
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call would block and retry with exponential backoff.
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For more usage and examples see the
|
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[godoc](http://godoc.org/github.com/hashicorp/go-retryablehttp).
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@ -0,0 +1,234 @@
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// The retryablehttp package provides a familiar HTTP client interface with
|
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// automatic retries and exponential backoff. It is a thin wrapper over the
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||||
// standard net/http client library and exposes nearly the same public API.
|
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// This makes retryablehttp very easy to drop into existing programs.
|
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//
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// retryablehttp performs automatic retries under certain conditions. Mainly, if
|
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// an error is returned by the client (connection errors etc), or if a 500-range
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// response is received, then a retry is invoked. Otherwise, the response is
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// returned and left to the caller to interpret.
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//
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// The main difference from net/http is that requests which take a request body
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// (POST/PUT et. al) require an io.ReadSeeker to be provided. This enables the
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// request body to be "rewound" if the initial request fails so that the full
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// request can be attempted again.
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package retryablehttp
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"math"
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"net/http"
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"net/url"
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"os"
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"strings"
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"time"
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"github.com/hashicorp/go-cleanhttp"
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)
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var (
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// Default retry configuration
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defaultRetryWaitMin = 1 * time.Second
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defaultRetryWaitMax = 5 * time.Minute
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defaultRetryMax = 32
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// defaultClient is used for performing requests without explicitly making
|
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// a new client. It is purposely private to avoid modifications.
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defaultClient = NewClient()
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)
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// LenReader is an interface implemented by many in-memory io.Reader's. Used
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// for automatically sending the right Content-Length header when possible.
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type LenReader interface {
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Len() int
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}
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// Request wraps the metadata needed to create HTTP requests.
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type Request struct {
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// body is a seekable reader over the request body payload. This is
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// used to rewind the request data in between retries.
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body io.ReadSeeker
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// Embed an HTTP request directly. This makes a *Request act exactly
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// like an *http.Request so that all meta methods are supported.
|
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*http.Request
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}
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|
||||
// NewRequest creates a new wrapped request.
|
||||
func NewRequest(method, url string, body io.ReadSeeker) (*Request, error) {
|
||||
// Wrap the body in a noop ReadCloser if non-nil. This prevents the
|
||||
// reader from being closed by the HTTP client.
|
||||
var rcBody io.ReadCloser
|
||||
if body != nil {
|
||||
rcBody = ioutil.NopCloser(body)
|
||||
}
|
||||
|
||||
// Make the request with the noop-closer for the body.
|
||||
httpReq, err := http.NewRequest(method, url, rcBody)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Check if we can set the Content-Length automatically.
|
||||
if lr, ok := body.(LenReader); ok {
|
||||
httpReq.ContentLength = int64(lr.Len())
|
||||
}
|
||||
|
||||
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)
|
||||
|
||||
// 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
|
||||
}
|
||||
|
||||
// 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,
|
||||
}
|
||||
}
|
||||
|
||||
// Do wraps calling an HTTP method with retries.
|
||||
func (c *Client) Do(req *Request) (*http.Response, error) {
|
||||
c.Logger.Printf("[DEBUG] %s %s", req.Method, req.URL)
|
||||
|
||||
for i := 0; ; i++ {
|
||||
var code int // HTTP response code
|
||||
|
||||
// Always rewind the request body when non-nil.
|
||||
if req.body != nil {
|
||||
if _, err := req.body.Seek(0, 0); err != nil {
|
||||
return nil, fmt.Errorf("failed to seek body: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
if c.RequestLogHook != nil {
|
||||
c.RequestLogHook(c.Logger, req.Request, i)
|
||||
}
|
||||
|
||||
// Attempt the request
|
||||
resp, err := c.HTTPClient.Do(req.Request)
|
||||
if err != nil {
|
||||
c.Logger.Printf("[ERR] %s %s request failed: %v", req.Method, req.URL, err)
|
||||
goto RETRY
|
||||
}
|
||||
code = resp.StatusCode
|
||||
|
||||
// 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.
|
||||
if code%500 < 100 {
|
||||
resp.Body.Close()
|
||||
goto RETRY
|
||||
}
|
||||
return resp, nil
|
||||
|
||||
RETRY:
|
||||
remain := c.RetryMax - i
|
||||
if remain == 0 {
|
||||
break
|
||||
}
|
||||
wait := backoff(c.RetryWaitMin, c.RetryWaitMax, i)
|
||||
desc := fmt.Sprintf("%s %s", req.Method, req.URL)
|
||||
if code > 0 {
|
||||
desc = fmt.Sprintf("%s (status: %d)", desc, code)
|
||||
}
|
||||
c.Logger.Printf("[DEBUG] %s: retrying in %s (%d left)", desc, wait, remain)
|
||||
time.Sleep(wait)
|
||||
}
|
||||
|
||||
// Return an error if we fall out of the retry loop
|
||||
return nil, fmt.Errorf("%s %s giving up after %d attempts",
|
||||
req.Method, req.URL, c.RetryMax+1)
|
||||
}
|
||||
|
||||
// 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 io.ReadSeeker) (*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 io.ReadSeeker) (*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()))
|
||||
}
|
||||
|
||||
// backoff is used to calculate how long to sleep before retrying
|
||||
// after observing failures. It takes the minimum/maximum wait time and
|
||||
// iteration, and returns the duration to wait.
|
||||
func backoff(min, max time.Duration, iter int) time.Duration {
|
||||
mult := math.Pow(2, float64(iter)) * float64(min)
|
||||
sleep := time.Duration(mult)
|
||||
if float64(sleep) != mult || sleep > max {
|
||||
sleep = max
|
||||
}
|
||||
return sleep
|
||||
}
|
||||
|
|
@ -442,6 +442,12 @@
|
|||
"revision": "d30f09973e19c1dfcd120b2d9c4f168e68d6b5d5",
|
||||
"revisionTime": "2015-09-16T20:57:42Z"
|
||||
},
|
||||
{
|
||||
"checksumSHA1": "9xZ1B0JppYRwKYtkT3PqQ255wqs=",
|
||||
"path": "github.com/hashicorp/go-retryablehttp",
|
||||
"revision": "0ef03300cde2dd0e2604ecc4e95ee7c76751be89",
|
||||
"revisionTime": "2016-05-09T16:28:51Z"
|
||||
},
|
||||
{
|
||||
"checksumSHA1": "A1PcINvF3UiwHRKn8UcgARgvGRs=",
|
||||
"path": "github.com/hashicorp/go-rootcerts",
|
||||
|
|
|
|||
Loading…
Reference in New Issue