BLD: bring mod in scope, handle errors

enclave/safetrace/enclave/src/data.rs

@@ -12,7 +12,7 @@ use serde_json::{Value, json};
 use serde::{Deserialize, Serialize};
 use rmp_serde::{Deserializer, Serializer};
 
-extern crate rgsl;
+use rgsl::types::Rng;
 
 use sgx_tseal::{SgxSealedData};
 use sgx_types::marker::ContiguousMemory;
@@ -31,6 +31,7 @@ pub enum Error {
     SliceError,
     UnsealError(sgx_status_t),
     SerializeError,
+    RandomGeneratorError,
     Other
 }
 
@@ -251,7 +252,7 @@ pub fn find_match_internal(
                             // https://stackoverflow.com/questions/5031268/algorithm-to-find-all-latitude-longitude-locations-within-a-certain-distance-fro
 
                                if (e.lat - d.lat).abs() * 111000.0 <  DISTANCE * 0.71 {
-                                   let mut r = Rng::new(gsl_rng_taus);
+                                   let mut r = Rng::new(&rgsl::types::rng::algorithms::taus()).ok_or(Error::RandomGeneratorError)?;
                                    let lapnoise = rgsl::randist::laplace::laplace(&mut r, 0.87).abs()*2.0;
                                 // then we can run a more computationally expensive and precise comparison
                                 if (e.lat.sin()*d.lat.sin()+e.lat.cos()*d.lat.cos()*(e.lng-d.lng).cos()).acos() * EARTH_RADIUS - lapnoise < DISTANCE {