Prashanth Pai 46d61a4dcd Refactor server side copy as middleware

Rewrite server side copy and 'object post as copy' feature as middleware to
simplify the PUT method in the object controller code. COPY is no longer
a verb implemented as public method in Proxy application.

The server side copy middleware is inserted to the left of dlo, slo and
versioned_writes middlewares in the proxy server pipeline. As a result,
dlo and slo copy_hooks are no longer required. SLO manifests are now
validated when copied so when copying a manifest to another account the
referenced segments must be readable in that account for the manifest
copy to succeed (previously this validation was not made, meaning the
manifest was copied but could be unusable if the segments were not
readable).

With this change, there should be no change in functionality or existing
behavior. This is asserted with (almost) no changes required to existing
functional tests.

Some notes (for operators):
* Middleware required to be auto-inserted before slo and dlo and
  versioned_writes
* Turning off server side copy is not configurable.
* object_post_as_copy is no longer a configurable option of proxy server
  but of this middleware. However, for smooth upgrade, config option set
  in proxy server app is also read.

DocImpact: Introducing server side copy as middleware

Co-Authored-By: Alistair Coles <alistair.coles@hpe.com>
Co-Authored-By: Thiago da Silva <thiago@redhat.com>

Change-Id: Ic96a92e938589a2f6add35a40741fd062f1c29eb
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Signed-off-by: Thiago da Silva <thiago@redhat.com>

2016-05-11 14:55:51 -04:00

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Middleware

Account Quotas

swift.common.middleware.account_quotas

Bulk Operations (Delete and Archive Auto Extraction)

swift.common.middleware.bulk

CatchErrors

swift.common.middleware.catch_errors

CNAME Lookup

swift.common.middleware.cname_lookup

Container Quotas

swift.common.middleware.container_quotas

Container Sync Middleware

swift.common.middleware.container_sync

Cross Domain Policies

swift.common.middleware.crossdomain

Discoverability

Swift will by default provide clients with an interface providing details about the installation. Unless disabled (i.e expose_info=false in proxy-server-config), a GET request to /info will return configuration data in JSON format. An example response:

{"swift": {"version": "1.11.0"}, "staticweb": {}, "tempurl": {}}

This would signify to the client that swift version 1.11.0 is running and that staticweb and tempurl are available in this installation.

There may be administrator-only information available via /info. To retrieve it, one must use an HMAC-signed request, similar to TempURL. The signature may be produced like so:

swift-temp-url GET 3600 /info secret 2>/dev/null | sed s/temp_url/swiftinfo/g

Domain Remap

swift.common.middleware.domain_remap

Dynamic Large Objects

DLO support centers around a user specified filter that matches segments and concatenates them together in object listing order. Please see the DLO docs for dlo-doc further details.

FormPost

swift.common.middleware.formpost

GateKeeper

swift.common.middleware.gatekeeper

Healthcheck

swift.common.middleware.healthcheck

KeystoneAuth

swift.common.middleware.keystoneauth

List Endpoints

swift.common.middleware.list_endpoints

Memcache

swift.common.middleware.memcache

Name Check (Forbidden Character Filter)

swift.common.middleware.name_check

Object Versioning

swift.common.middleware.versioned_writes

Proxy Logging

swift.common.middleware.proxy_logging

Ratelimit

swift.common.middleware.ratelimit

Recon

swift.common.middleware.recon

Server Side Copy

swift.common.middleware.copy

Static Large Objects

Please see the SLO docs for slo-doc further details.

StaticWeb

swift.common.middleware.staticweb

TempAuth

swift.common.middleware.tempauth

TempURL

swift.common.middleware.tempurl

XProfile

swift.common.middleware.xprofile

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