Instead of returning null, LfsProtocolServlet#getLargeFileRepository
should throw LfsUnavailable.
If null is returned, throw a generic LfsException.
Handle LfsException as an internal server error and return HTTP 500.
Change-Id: I33e2a19fcc0fde8aaf0f703860c8fa8ce2de2db5
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Since [1], the git-lfs specification allows the server to return
HTTP 507 if there is insufficient storage for the uploaded object(s).
Add a new exception class, which implementations may throw from the
getRepository() method, causing HTTP 507 to be returned to the client.
[1] https://github.com/github/git-lfs/pull/1473
Change-Id: If5bc0a35fcf870d4216af6ca2f7c8924689ef9c5
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
The git-lfs specification [1] describes the following optional status codes
that may be returned:
429 - The user has hit a rate limit with the server. Though the API does
not specify any rate limits, implementors are encouraged to set some
for availability reasons.
509 - Returned if the bandwidth limit for the user or repository has been
exceeded. The API does not specify any bandwidth limit, but implementors
may track usage.
Add two new exception classes to represent these cases. Implementations may
throw these from #getLargeFileRepository(), causing the corresponding HTTP
status codes to be returned to the client.
[1] https://github.com/github/git-lfs/blob/master/docs/api/v1/http-v1-batch.md
Change-Id: I7b93f3cf90f7344c90b1587e07927fdeb167097e
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
If the message is not sent, the client shows:
Unable to parse HTTP response for POST http://admin@localhost:8080/test-project/info/lfs/objects/batch
Change-Id: I8b72d1aded2bcd41b7389676e2373034625a1379
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
If the Content-Type is not set on error responses, the git-lfs client
does not read the body which contains the error message, and instead
just displays a generic error message.
Also set the charset on the Content-Type header.
Change-Id: I88e6f07f20b622a670e7c5063145dffb8b630aee
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Pretty printing is only used for outputting json content, which is
interpreted by the client and does not need to be pretty printed.
Change-Id: I48e0280241b6b0f5706300ae0f4c9bc461a89110
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Trying to open a new writer on the response causes an illegal state
exception and the response is not sent.
Change-Id: Ic718d23cfb3e74f5691cc2aea7283003af7df207
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
bb9988c2 changed the signature of getLargeFileRepository() which is only
breaking implementors which is ok according to OSGi semantic versioning
rules.
Change-Id: I68bda7900b72e217571f74aee53705167f8100a2
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Classes implementing the LFS servlet should be able to inspect the
objects given in the request.
Add a getObjects method. Make the LfsObject class public, and add
accessor methods.
Change-Id: I27961679f620eb3a89dc8521aadd4ea2f936c60e
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
According to the specification [1] the server may return the following
HTTP error responses:
- 403: The user has read, but not write access.
- 404: The repository does not exist for the user.
- 422: Validation error with one or more of the objects in the request.
In the current implementation, however, getLargeFileRepository can only
return null to indicate an error. This results in the error code:
- 503: Service Unavailable
being returned to the client regardless of what the actual reason was.
Add exception classes to cover these cases, derived from a common base
exception, and change the specification of getLargeFileRepository to throw
the base exception.
In LfsProtocolServlet#post, handle the new exceptions and send back the
appropriate HTTP responses as mentioned above.
The specification also mentions several other optional response codes (406,
429, 501, and 509) but these are not implemented in this commit. It should
be trivial to implement them in follow-up commits.
[1] https://github.com/github/git-lfs/blob/master/docs/api/v1/http-v1-batch.md#response-errors
Change-Id: I91be6165bcaf856d0cefc533882330962e2fc9b2
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
Passing the request and path to the method will allow implementations
to have more control over determination of the backend, for example:
- return different backends for different requests
- accept or refuse requests based on request characteristics
- etc
Change-Id: I1ec6ec54c91a5f0601b620ed18846eb4a3f46783
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
According to the specification [1], the error response status code
should be 422 when there is a validation error with one or more of
the objects in the request
[1] https://github.com/github/git-lfs/blob/master/docs/api/v1/http-v1-batch.md#response-errors
Change-Id: Id03fe00a2109b896d9a154228a14a33bce5accc3
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
The location of the API v1 documentation has changed. Update the
links accordingly.
Change-Id: If0148a0b573c474bbe157fcb7e6674c0055fe8b4
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
We ignored the returned concatenation of host name and port number. Fix
this and use a StringBuilder to avoid creation of unnecessary String
objects.
Change-Id: I61fac639d4a4c95412eb41a0f9131d0c38aca794
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
The FileLfsRepository.out member could have been accessed from multiple
threads which would corrupt the content.
Don't store the AtomicObjectOutputStream in the FileLfsRepository.out but
move it to the ObjectUploadListener which is instantiated per-request.
Add a parallel upload test.
Change-Id: I62298630e99c46b500d376843ffcde934436215b
Signed-off-by: Saša Živkov <sasa.zivkov@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Add a storage implementation storing large objects in Amazon S3.
The AmazonS3Repository pre-signs download and upload requests.
AWS access and secret key are expected to be in the
$HOME/.aws/credentials file in the following format:
[default]
accessKey = ...
secretKey = ...
Use AWS version 4 request signing [1] because it is more secure and
supported by all regions. The version 3 signing is not supported in
newer regions.
In follow up changes we should:
- implement getVerifyAction() and do actual verification. Subclasses of
S3Repository can implement caching for object meta data (size) in order
to avoid extra roundtrips to S3. Verification should ensure that meta
data store and content of S3 storage are in sync
- HEAD request used in S3Repository.getSize() seems to always return
Content-length 0 in contrast to the documentation [2]. So getSize() does
detect if the object exists in S3 or not but in case the object exists
it always returns size 0
[1] http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html
[2] https://forums.aws.amazon.com/thread.jspa?threadID=223616
Change-Id: Ic47f094928a259e5264c92b3aacf6d90210907a8
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Sasa Zivkov <sasa.zivkov@sap.com>
Implement LfsProtocolServlet handling the "Git LFS v1 Batch API"
protocol [1]. Add a simple file system based LFS content store and the
debug-lfs-store command to simplify testing.
Introduce a LargeFileRepository interface to enable additional storage
implementation while reusing the same protocol implementation.
At the client side we have to configure the lfs.url, specify that
we use the batch API and we don't use authentication:
[lfs]
url = http://host:port/lfs
batch = true
[lfs "http://host:port/lfs"]
access = none
the git-lfs client appends the "objects/batch" to the lfs.url.
Hard code an Authorization header in the FileLfsRepository.getAction
because then git-lfs client will skip asking for credentials. It will
just forward the Authorization header from the response to the
download/upload request.
The FileLfsServlet supports file content storage for "Large File
Storage" (LFS) server as defined by the Github LFS API [2].
- upload and download of large files is probably network bound hence use
an asynchronous servlet for good scalability
- simple object storage in file system with 2 level fan-out
- use LockFile to protect writing large objects against multiple
concurrent uploads of the same object
- to prevent corrupt uploads the uploaded file is rejected if its hash
doesn't match id given in URL
The debug-lfs-store command is used to run the LfsProtocolServlet and,
optionally, the FileLfsServlet which makes it easier to setup a
local test server.
[1]
https://github.com/github/git-lfs/blob/master/docs/api/http-v1-batch.md
[2] https://github.com/github/git-lfs/tree/master/docs/api
Bug: 472961
Change-Id: I7378da5575159d2195138d799704880c5c82d5f3
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: Sasa Zivkov <sasa.zivkov@sap.com>
David Pursehouse
Matthias Sohn
Markus Keller
Saša Živkov