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use anyhow::{bail, Result};
use std::collections::HashMap;
use std::convert::TryFrom;
use std::fmt;
use std::format;
use std::io::Write;
use teaclave_types::{FunctionArguments, FunctionRuntime};
const IN_DATA: &str = "input_data";
const OUT_RESULT: &str = "output_data";
#[derive(Default)]
pub struct PrivateJoinAndCompute;
#[derive(serde::Deserialize)]
struct PrivateJoinAndComputeArguments {
num_user: usize, }
impl TryFrom<FunctionArguments> for PrivateJoinAndComputeArguments {
type Error = anyhow::Error;
fn try_from(arguments: FunctionArguments) -> Result<Self, Self::Error> {
use anyhow::Context;
serde_json::from_str(&arguments.into_string()).context("Cannot deserialize arguments")
}
}
impl PrivateJoinAndCompute {
pub const NAME: &'static str = "builtin-private-join-and-compute";
pub fn new() -> Self {
Default::default()
}
pub fn run(
&self,
arguments: FunctionArguments,
runtime: FunctionRuntime,
) -> anyhow::Result<String> {
let args = PrivateJoinAndComputeArguments::try_from(arguments)?;
let num_user = args.num_user;
if num_user < 2 {
bail!("The demo requires at least two parties!");
}
let mut output = String::new();
let data_0 = get_data(0, &runtime)?;
let input_map_0 = parse_input(data_0)?;
let mut res_map: HashMap<String, u32> = input_map_0;
for i in 1..num_user {
let data = get_data(i, &runtime)?;
let input_map = parse_input(data)?;
res_map = get_intersection_sum(&input_map, &res_map);
}
for (identity, amount) in res_map {
fmt::write(&mut output, format_args!("{}, {}\n", identity, amount))?;
}
let output_bytes = output.as_bytes();
for i in 0..num_user {
let output_file_name = format!("{}{}", OUT_RESULT, i);
let mut output = runtime.create_output(&output_file_name)?;
output.write_all(output_bytes)?;
}
let summary = format!("{} users join the task in total.", num_user);
Ok(summary)
}
}
fn get_data(user_id: usize, runtime: &FunctionRuntime) -> anyhow::Result<Vec<u8>> {
let mut data: Vec<u8> = Vec::new();
let input_file_name = format!("{}{}", IN_DATA, user_id);
let mut input_io = runtime.open_input(&input_file_name)?;
input_io.read_to_end(&mut data)?;
Ok(data)
}
fn get_intersection_sum(
map1: &HashMap<String, u32>,
map2: &HashMap<String, u32>,
) -> HashMap<String, u32> {
let mut res_map: HashMap<String, u32> = HashMap::new();
for (identity, amount) in map1 {
if map2.contains_key(identity) {
let total = amount + map2[identity];
res_map.insert(identity.to_owned(), total);
}
}
res_map
}
fn parse_input(data: Vec<u8>) -> anyhow::Result<HashMap<String, u32>> {
let data_list = String::from_utf8(data)?;
let mut ret: HashMap<String, u32> = HashMap::new();
for data_item in data_list.split('\n') {
let pair = data_item.trim();
if pair.len() < 3 {
continue;
}
let kv_pair: Vec<&str> = pair.split(':').collect();
if kv_pair.len() != 2 {
continue;
}
let identity = kv_pair[0].trim().to_string();
let amount = match kv_pair[1].trim().parse::<u32>() {
Ok(amount) => amount,
Err(_) => continue,
};
ret.insert(identity, amount);
}
Ok(ret)
}
#[cfg(feature = "enclave_unit_test")]
pub mod tests {
use super::*;
use serde_json::json;
use std::untrusted::fs;
use teaclave_crypto::*;
use teaclave_runtime::*;
use teaclave_test_utils::*;
use teaclave_types::*;
pub fn run_tests() -> bool {
run_tests!(test_private_join_and_compute)
}
fn test_private_join_and_compute() {
let arguments = FunctionArguments::from_json(json!({
"num_user": 3
}))
.unwrap();
let user0_input = "fixtures/functions/private_join_and_compute/three_party_data/bank_a.txt";
let user0_output =
"fixtures/functions/private_join_and_compute/three_party_data/user0_output.txt";
let user1_input = "fixtures/functions/private_join_and_compute/three_party_data/bank_b.txt";
let user1_output =
"fixtures/functions/private_join_and_compute/three_party_data/user1_output.txt";
let user2_input = "fixtures/functions/private_join_and_compute/three_party_data/bank_c.txt";
let user2_output =
"fixtures/functions/private_join_and_compute/three_party_data/user2_output.txt";
let input_files = StagedFiles::new(hashmap!(
"input_data0" =>
StagedFileInfo::new(user0_input, TeaclaveFile128Key::random(), FileAuthTag::mock()),
"input_data1" =>
StagedFileInfo::new(user1_input, TeaclaveFile128Key::random(), FileAuthTag::mock()),
"input_data2" =>
StagedFileInfo::new(user2_input, TeaclaveFile128Key::random(), FileAuthTag::mock())
));
let output_files = StagedFiles::new(hashmap!(
"output_data0" =>
StagedFileInfo::new(user0_output, TeaclaveFile128Key::random(), FileAuthTag::mock()),
"output_data1" =>
StagedFileInfo::new(user1_output, TeaclaveFile128Key::random(), FileAuthTag::mock()),
"output_data2" =>
StagedFileInfo::new(user2_output, TeaclaveFile128Key::random(), FileAuthTag::mock())
));
let runtime = Box::new(RawIoRuntime::new(input_files, output_files));
let summary = PrivateJoinAndCompute::new()
.run(arguments, runtime)
.unwrap();
let user0 = fs::read_to_string(user0_output).unwrap();
let user1 = fs::read_to_string(user1_output).unwrap();
let user2 = fs::read_to_string(user2_output).unwrap();
assert_eq!(&user0[..], &user1[..]);
assert_eq!(&user1[..], &user2[..]);
assert_eq!(summary, "3 users join the task in total.")
}
}