git-annex/doc/git-annex-p2phttp.mdwn
Joey Hess d1faa13d6a
implement proxy connection pool
removeOldestProxyConnectionPool will be innefficient the larger the pool
is. A better data structure could be more efficient. Eg, make each value
in the pool include the timestamp of its oldest element, then the oldest
value can be found and modified, rather than rebuilding the whole Map.

But, for pools of a few hundred items, this should be fine. It's O(n*n log n)
or so.

Also, when more than 1 connection with the same pool key exists,
it's efficient even for larger pools, since removeOldestProxyConnectionPool
is not needed.

The default of 1 idle connection could perhaps be larger.. like the
number of jobs? Otoh, it seems good to ramp up and down the number of
connections, which does happen. With 1, there is at most one stale
connection, which might cause a request to fail.
2024-07-26 17:03:31 -04:00

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# NAME
git-annex-p2phttp - HTTP server for the git-annex API
# SYNOPSIS
git-annex p2phttp
# DESCRIPTION
This is a HTTP server for the git-annex API.
It is the git-annex equivilant of git-http-backend(1), for serving
a repository over HTTP with write access for authenticated users.
This does not serve the git repository over HTTP, only the git-annex
API.
Typically a remote will have `remote.name.url` set to a http url
as usual, and `remote.name.annexUrl` set to an annex+http url such as
`annex+http://example.com/git-annex/$uuid`. The annex+http url is
served by this server, and uses port 9417 by default.
As well as serving the git-annex HTTP API, this server provides a
convenient way to download the content of any key, by using the path
"/git-annex/$uuid/$key". For example:
$ curl http://example.com:9417/git-annex/f11773f0-11e1-45b2-9805-06db16768efe/key/SHA256E-s6--5891b5b522d5df086d0ff0b110fbd9d21bb4fc7163af34d08286a2e846f6be03
hello
# OPTIONS
* `--jobs=N` `-JN`
This or annex.jobs must be set to configure the number of worker
threads.
Since the webserver itself uses one thread, this needs to be set to
2 or more.
A good choice is one worker per CPU core: `--jobs=cpus`
* `--proxyconnections=N`
When is command is run in a repository that is configured to act as a
proxy for some of its remotes, this is the maximum number of idle
connections to keep open to proxied remotes.
The default is 1.
* `--port=N`
Port to listen on. The default is port 9417, which is the default
port used for an annex+http or annex+https url.
It is not recommended to run this command as root in order to
use a low port like port 80. It will not drop permissions when run as
root.
* `--bind=address`
What address to bind to. The default is to bind to all addresses.
* `--certfile=filename`
TLS certificate file to use. Combining this with `--privatekeyfile`
makes the server use HTTPS.
* `--privatekeyfile=filename`
TLS private key file to use. Combining this with `--certfile`
makes the server use HTTPS.
* `--chainfile=filename`
TLS chain file to use. This option can be repeated any number of times.
* `--authenv`
Allows users to be authenticated with a username and password.
For security, this only allows authentication when the user connects over
HTTPS.
To configure the passwords, set environment variables
like `GIT_ANNEX_P2PHTTP_PASSWORD_alice=foo123`
The permissions of users can also be configured by setting
environment variables like
`GIT_ANNEX_P2PHTTP_PERMISSIONS_alice=readonly`. The value
can be either "readonly" or "appendonly". When this is not set,
the default is to give the user full read+write+remove access.
* `--authenv-http`
Like `--authenv`, but allows authentication when the user connects
over HTTP. This is not secure, since HTTP basic authentication is not
encrypted.
* `--unauth-readonly`
Allows unauthenticated users to read the repository, but not make
modifications to it.
* `--unauth-appendonly`
Allows unauthenticated users to read the repository, and store data in
it, but not remove data from it.
* `--wideopen`
Gives unauthenticated users full read+write+remove access to the
repository.
Please think carefully before enabling this option.
# SEE ALSO
[[git-annex]](1)
git-http-backend(1)
[[git-annex-shell]](1)
[[git-annex-updateproxy]](1)
<https://git-annex.branchable.com/design/p2p_protocol_over_http/>
# AUTHOR
Joey Hess <id@joeyh.name>
<http://git-annex.branchable.com/>
Warning: Automatically converted into a man page by mdwn2man. Edit with care