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extern crate alloc;
use alloc::{format, string::String, vec::Vec};
use serde::Serialize;
use serde_json::{json, Value};
const MAX_STRING_LEN: usize = 150;
#[derive(Debug)]
struct SubstringSpec {
start_index: usize,
length: usize,
}
impl SubstringSpec {
fn new(start_index: usize, length: usize) -> Self {
Self {
start_index,
length,
}
}
}
pub fn json_pretty_print<T>(value: &T) -> serde_json::Result<String>
where
T: ?Sized + Serialize,
{
let mut json_value = json!(value);
shorten_string_field(&mut json_value);
serde_json::to_string_pretty(&json_value)
}
fn find_hex_strings_longer_than(string: &str, max_len: usize) -> Vec<SubstringSpec> {
let mut ranges_to_remove = Vec::new();
let mut start_index = 0;
let mut contiguous_hex_count = 0;
for (index, char) in string.char_indices() {
if char.is_ascii_hexdigit() {
if contiguous_hex_count == 0 {
start_index = index;
}
contiguous_hex_count += 1;
} else if contiguous_hex_count != 0 {
if contiguous_hex_count > max_len {
ranges_to_remove.push(SubstringSpec::new(start_index, contiguous_hex_count));
}
contiguous_hex_count = 0;
}
}
if contiguous_hex_count > max_len {
ranges_to_remove.push(SubstringSpec::new(start_index, contiguous_hex_count));
}
ranges_to_remove
}
fn shorten_string_field(value: &mut Value) {
match value {
Value::String(string) => {
find_hex_strings_longer_than(string, MAX_STRING_LEN)
.into_iter()
.rev()
.for_each(
|SubstringSpec {
start_index,
length,
}| {
let range = start_index..(start_index + length);
string.replace_range(range, &format!("[{} hex chars]", length));
},
)
}
Value::Array(values) => {
for value in values {
shorten_string_field(value);
}
}
Value::Object(map) => {
for map_value in map.values_mut() {
shorten_string_field(map_value);
}
}
Value::Null | Value::Bool(_) | Value::Number(_) => {}
}
}
#[cfg(test)]
mod tests {
use super::*;
fn hex_string(length: usize) -> String {
"0123456789abcdef".chars().cycle().take(length).collect()
}
impl PartialEq<(usize, usize)> for SubstringSpec {
fn eq(&self, other: &(usize, usize)) -> bool {
self.start_index == other.0 && self.length == other.1
}
}
#[test]
fn finds_hex_strings_longer_than() {
const TESTING_LEN: usize = 3;
let input = "01234";
let expected = vec![(0, 5)];
let actual = find_hex_strings_longer_than(input, TESTING_LEN);
assert_eq!(actual, expected);
let input = "01234-0123";
let expected = vec![(0, 5), (6, 4)];
let actual = find_hex_strings_longer_than(input, TESTING_LEN);
assert_eq!(actual, expected);
let input = "012-34-0123";
let expected = vec![(7, 4)];
let actual = find_hex_strings_longer_than(input, TESTING_LEN);
assert_eq!(actual, expected);
let input = "012-34-01-23";
let expected: Vec<(usize, usize)> = vec![];
let actual = find_hex_strings_longer_than(input, TESTING_LEN);
assert_eq!(actual, expected);
let input = "0";
let expected: Vec<(usize, usize)> = vec![];
let actual = find_hex_strings_longer_than(input, TESTING_LEN);
assert_eq!(actual, expected);
let input = "";
let expected: Vec<(usize, usize)> = vec![];
let actual = find_hex_strings_longer_than(input, TESTING_LEN);
assert_eq!(actual, expected);
}
#[test]
fn respects_length() {
let input = "I like beef";
let expected = vec![(7, 4)];
let actual = find_hex_strings_longer_than(input, 3);
assert_eq!(actual, expected);
let input = "I like beef";
let expected: Vec<(usize, usize)> = vec![];
let actual = find_hex_strings_longer_than(input, 1000);
assert_eq!(actual, expected);
}
#[test]
fn should_shorten_long_strings() {
let max_unshortened_hex_string = hex_string(MAX_STRING_LEN);
let long_hex_string = hex_string(MAX_STRING_LEN + 1);
let long_non_hex_string: String = "g".repeat(MAX_STRING_LEN + 1);
let long_hex_substring = format!("a-{}-b", hex_string(MAX_STRING_LEN + 1));
let multiple_long_hex_substrings =
format!("a: {0}, b: {0}, c: {0}", hex_string(MAX_STRING_LEN + 1));
let mut long_strings: Vec<String> = vec![];
for i in 1..=5 {
long_strings.push("a".repeat(MAX_STRING_LEN + i));
}
let value = json!({
"field_1": Option::<usize>::None,
"field_2": true,
"field_3": 123,
"field_4": max_unshortened_hex_string,
"field_5": ["short string value", long_hex_string],
"field_6": {
"f1": Option::<usize>::None,
"f2": false,
"f3": -123,
"f4": long_non_hex_string,
"f5": ["short string value", long_hex_substring],
"f6": {
"final long string": multiple_long_hex_substrings
}
}
});
let expected = r#"{
"field_1": null,
"field_2": true,
"field_3": 123,
"field_4": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef012345",
"field_5": [
"short string value",
"[151 hex chars]"
],
"field_6": {
"f1": null,
"f2": false,
"f3": -123,
"f4": "ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg",
"f5": [
"short string value",
"a-[151 hex chars]-b"
],
"f6": {
"final long string": "a: [151 hex chars], b: [151 hex chars], c: [151 hex chars]"
}
}
}"#;
let output = json_pretty_print(&value).unwrap();
assert_eq!(
output, expected,
"Actual:\n{}\nExpected:\n{}\n",
output, expected
);
}
#[test]
fn should_not_modify_short_strings() {
let max_string: String = "a".repeat(MAX_STRING_LEN);
let value = json!({
"field_1": Option::<usize>::None,
"field_2": true,
"field_3": 123,
"field_4": max_string,
"field_5": [
"short string value",
"another short string"
],
"field_6": {
"f1": Option::<usize>::None,
"f2": false,
"f3": -123,
"f4": "short",
"f5": [
"short string value",
"another short string"
],
"f6": {
"final string": "the last short string"
}
}
});
let expected = serde_json::to_string_pretty(&value).unwrap();
let output = json_pretty_print(&value).unwrap();
assert_eq!(
output, expected,
"Actual:\n{}\nExpected:\n{}\n",
output, expected
);
}
#[test]
fn regression_1456() {
let long_string = r#"state query failed: ValueNotFound("Failed to find base key at path: Key::Account(72698d4dc715a28347b15920b09b4f0f1d633be5a33f4686d06992415b0825e2)")"#;
assert_eq!(long_string.len(), 148);
let value = json!({
"code": -32003,
"message": long_string,
});
let expected = r#"{
"code": -32003,
"message": "state query failed: ValueNotFound(\"Failed to find base key at path: Key::Account(72698d4dc715a28347b15920b09b4f0f1d633be5a33f4686d06992415b0825e2)\")"
}"#;
let output = json_pretty_print(&value).unwrap();
assert_eq!(
output, expected,
"Actual:\n{}\nExpected:\n{}\n",
output, expected
);
}
}