Crate janus_collector
source ·Expand description
A DAP-PPM collector
This library implements the collector role of the DAP-PPM protocol. It works in concert with two DAP-PPM aggregator servers to compute a statistical aggregate over data from many clients, while preserving the privacy of each client’s data.
§Examples
use janus_collector::{AuthenticationToken, Collector};
use janus_core::{hpke::generate_hpke_config_and_private_key};
use janus_messages::{
Duration, HpkeAeadId, HpkeConfig, HpkeConfigId, HpkeKdfId, HpkeKemId, Interval, TaskId,
Time, Query,
};
use prio::vdaf::prio3::Prio3;
use rand::random;
use url::Url;
// Supply DAP task parameters.
let task_id = random();
let hpke_keypair = janus_core::hpke::generate_hpke_config_and_private_key(
HpkeConfigId::from(0),
HpkeKemId::X25519HkdfSha256,
HpkeKdfId::HkdfSha256,
HpkeAeadId::Aes128Gcm,
).unwrap();
// Supply a VDAF implementation, corresponding to this task.
let vdaf = Prio3::new_count(2).unwrap();
let collector = Collector::new(
task_id,
"https://example.com/dap/".parse().unwrap(),
AuthenticationToken::new_bearer_token_from_string("Y29sbGVjdG9yIHRva2Vu").unwrap(),
hpke_keypair,
vdaf,
)
.unwrap();
// Specify the time interval over which the aggregation should be calculated.
let interval = Interval::new(
Time::from_seconds_since_epoch(1_656_000_000),
Duration::from_seconds(3600),
)
.unwrap();
// Make the requests and retrieve the aggregated statistic.
let aggregation_result = collector.collect(Query::new_time_interval(interval), &()).await.unwrap();
Re-exports§
pub use retry_after;
Structs§
- The result of a collection operation.
- Collector state related to a collection job that is in progress.
- A DAP collector.
- Builder for configuring a
Collector
. - Serializable representation of a private collector credential, which contains all secrets a collector uses to interact with an aggregator. It contains the
BearerToken
for authorization to an aggregator, and the private HPKE configuration for decrypting aggregate shares.
Enums§
- Different modes of authentication supported by Janus for either sending requests (e.g., leader to helper) or receiving them (e.g., collector to leader).
- Errors that may occur when performing collections.
- The result of a collection request poll operation. This will either provide the collection result or indicate that the collection is still being processed.
Functions§
- Construct a
reqwest::Client
suitable for use in a DAPCollector
.
Type Aliases§
- Exponential backoff policy with system’s clock.