1 use serde::Deserialize; 2 use std::fs::File; 3 4 #[derive(Debug, Deserialize)] 5 struct Feature { 6 location: Location, 7 name: String, 8 } 9 10 #[derive(Debug, Deserialize)] 11 struct Location { 12 latitude: i32, 13 longitude: i32, 14 } 15 16 #[allow(dead_code)] 17 pub fn load() -> Vec<crate::routeguide::Feature> { 18 let file = 19 File::open("tonic-examples/data/route_guide_db.json").expect("failed to open data file"); 20 21 let decoded: Vec<Feature> = 22 serde_json::from_reader(&file).expect("failed to deserialize features"); 23 24 decoded 25 .into_iter() 26 .map(|feature| crate::routeguide::Feature { 27 name: feature.name, 28 location: Some(crate::routeguide::Point { 29 longitude: feature.location.longitude, 30 latitude: feature.location.latitude, 31 }), 32 }) 33 .collect() 34 } 35