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timestamp replacement

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This commit is contained in:
Dull Bananas 2024-05-18 21:56:04 +00:00
parent 84bf57e1b0
commit d18c2c9cf3
1 changed files with 39 additions and 4 deletions
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43
crates/db_schema/src/schema_setup/diff_check.rs
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@ -7,7 +7,6 @@ use std::{
pub fn get_dump() -> String {
let output = Command::new("pg_dump")
.args(["--schema-only"])
.env("DATABASE_URL", SETTINGS.get_database_url())
.stderr(Stdio::inherit())
.output()
@ -19,9 +18,45 @@ pub fn get_dump() -> String {
String::from_utf8(output.stdout).expect("pg_dump output is not valid UTF-8 text")
}
const PATTERN_LEN: usize = 19;
// TODO add unit test for output
pub fn check_dump_diff(before: String, name: &str) {
let after = get_dump();
pub fn check_dump_diff(mut before: String, name: &str) {
let mut after = get_dump();
// Ignore timestamp differences by removing timestamps
for dump in [&mut before, &mut after] {
for index in 0.. {
// Check for this pattern: 0000-00-00 00:00:00
let Some((
&[a0, a1, a2, a3, b0, a4, a5, b1, a6, a7, b2, a8, a9, b3, a10, a11, b4, a12, a13],
remaining,
)) = dump
.get(index..)
.and_then(|s| s.as_bytes().split_first_chunk::<PATTERN_LEN>())
else {
break;
};
if [a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13]
.into_iter()
.all(|byte| byte.is_ascii_digit())
&& [b0, b1, b2, b3, b4] == *b"-- ::"
{
// Replace the part of the string that has the checked pattern and an optional fractional part
let len_after = if let Some((b'.', s)) = remaining.split_first() {
1 + s.iter().position(|c| !c.is_ascii_digit()).unwrap_or(0)
} else {
0
};
// Length of replacement string is likely to match previous string
// (usually there's up to 6 digits after the decimal point)
dump.replace_range(
index..(index + PATTERN_LEN + len_after),
"AAAAAAAAAAAAAAAAAAAAAAAAAA",
);
}
}
}
if after == before {
return;
}
@ -68,7 +103,7 @@ pub fn check_dump_diff(before: String, name: &str) {
})
.expect("resize should have prevented this from failing");
output.push_str('\n');
output.push('\n');
for line in diff::lines(most_similar_chunk, before_chunk) {
match line {
diff::Result::Left(s) => write!(&mut output, "\n- {s}"),