5 releases
0.0.5 | Oct 18, 2024 |
---|---|
0.0.4 | Sep 16, 2024 |
0.0.3 | Sep 16, 2024 |
0.0.2 | Jun 30, 2024 |
0.0.1 | Jun 30, 2024 |
#434 in Web programming
165 downloads per month
105KB
2K
SLoC
CVMFS server scraper
This library scrapes the public metadata sources from a CVMFS server and validates the data. The files fetched are:
- cvmfs/info/v1/repositories.json
- cvmfs/info/v1/meta.json
And for each repository, it fetches:
- cvmfs/<repo>/.cvmfs_status.json
- cvmfs/<repo>/.cvmfspublished
Usage
use cvmfs_server_scraper::{Hostname, Server, ServerBackendType, ServerType,
ScrapedServer, ScraperCommon, Scraper, CVMFSScraperError, DEFAULT_GEOAPI_SERVERS};
#[tokio::main]
async fn main() -> Result<(), CVMFSScraperError> {
let servers = vec![
Server::new(
ServerType::Stratum1,
ServerBackendType::CVMFS,
Hostname::try_from("azure-us-east-s1.eessi.science")?,
),
Server::new(
ServerType::Stratum1,
ServerBackendType::AutoDetect,
Hostname::try_from("aws-eu-central-s1.eessi.science")?,
),
Server::new(
ServerType::SyncServer,
ServerBackendType::S3,
Hostname::try_from("aws-eu-west-s1-sync.eessi.science")?,
),
];
let repolist = vec!["software.eessi.io", "dev.eessi.io", "riscv.eessi.io"];
let ignored_repos = vec!["nope.eessi.io"];
// Build a Scraper and scrape all servers in parallel
let scraped_servers = Scraper::new()
.forced_repositories(repolist)
.ignored_repositories(ignored_repos)
.geoapi_servers(DEFAULT_GEOAPI_SERVERS.clone())? // This is the default list
.with_servers(servers) // Transitions to a WithServer state.
.validate()? // Transitions to a ValidatedAndReady state, now immutable.
.scrape().await; // Perform the scrape, return servers.
for server in scraped_servers {
match server {
ScrapedServer::Populated(populated_server) => {
println!("{}", populated_server);
populated_server.output();
println!();
}
ScrapedServer::Failed(failed_server) => {
panic!("Error! {} failed scraping: {:?}", failed_server.hostname, failed_server.error);
}
}
}
Ok(())
}
A word about server backends
There are three valid options for backends for a given server. These are:
CVMFS
: This backend requirescvmfs/info/v1/repositories.json
to be present on the server. Scrape fails if it is missing.S3
: Does not even attempt to fetchcvmfs/info/v1/repositories.json
. Note that if any server has S3 as a backend a list of repositories must be passed to the scraper as there is no other way to determine the list of repositories for S3 servers. Due to the async scraping of all servers, there is currently no support for falling back on repositories detected from other server types (including possibly the Stratum0).AutoDetect
: This backend Aatempts to fetchcvmfs/info/v1/repositories.json
but does not fail if it is missing. If the scraper fails to fetch the file, the backend will be assumed to be S3. If the list of repositories is empty, the scraper will return an empty list. If your S3 server has no repositories, setting the backend to AutoDetect will allow the scraper to continue without failing.
For populated servers, the field backend_detected
will be set to the detected backend, which for explicit S3 or CVMFS servers will be the same as requested type.
What repositories are scraped?
- For servers that are set to or detected as CVMFS, the scraper will scrape the union of the detected and configurations explicitly stated repositories.
- For servers that are set to or detected as S3, only the explicitly stated repositories will be scraped (and the scraper will fail if the server type is explicitly set to S3 and no repositories are passed).
License
Licensed under the MIT license. See the LICENSE file for details.
Dependencies
~8–19MB
~259K SLoC