planetscale_driver/
deserializer.rs

1use crate::{structs::ExecuteResponse, utils::from_base64, Parser};
2use anyhow::{Context, Result};
3
4pub trait Deserializer {
5    fn deserialize_raw(input: Vec<&str>) -> Result<Self>
6    where
7        Self: Sized;
8}
9
10impl ExecuteResponse {
11    pub fn deserialize<T>(&self) -> Result<T>
12    where
13        T: Deserializer,
14    {
15        if let Some(res) = &self.result {
16            if let Some(rows) = &res.rows {
17                if rows.len() != 1 {
18                    anyhow::bail!("Expected 1 row, got {}", rows.len());
19                }
20
21                let row = &rows[0];
22                let row_str = from_base64(&row.values);
23                let row_str = String::from_utf8(row_str).unwrap();
24
25                let lengths: Vec<usize> = row
26                    .lengths
27                    .iter()
28                    .map(|l| l.parse::<usize>().unwrap())
29                    .collect();
30
31                let mut row_vec: Vec<&str> = Vec::new();
32                let mut last = 0;
33                for length in lengths {
34                    row_vec.push(&row_str[last..(last + length)]);
35                    last += length;
36                }
37
38                let res = T::deserialize_raw(row_vec).context("Failed to deserialize row")?;
39                return Ok(res);
40            }
41        }
42
43        anyhow::bail!("No results found");
44    }
45
46    pub fn deserialize_multiple<T>(&self) -> Result<Vec<T>>
47    where
48        T: Deserializer,
49    {
50        if let Some(res) = &self.result {
51            if let Some(rows) = &res.rows {
52                let mut out: Vec<T> = Vec::new();
53                for row in rows {
54                    let row_str = from_base64(&row.values);
55                    let row_str = String::from_utf8(row_str).unwrap();
56
57                    let lengths: Vec<usize> = row
58                        .lengths
59                        .iter()
60                        .map(|l| l.parse::<usize>().unwrap())
61                        .collect();
62
63                    let mut row_vec: Vec<&str> = Vec::new();
64                    let mut last = 0;
65                    for length in lengths {
66                        row_vec.push(&row_str[last..(last + length)]);
67                        last += length;
68                    }
69
70                    out.push(T::deserialize_raw(row_vec).context("Failed to deserialize row")?);
71                }
72
73                return Ok(out);
74            }
75        }
76
77        anyhow::bail!("No results found");
78    }
79
80    pub fn deserialize_scalar<T>(&self) -> Result<T>
81    where
82        T: Parser,
83    {
84        if let Some(res) = &self.result {
85            if let Some(rows) = &res.rows {
86                if rows.len() != 1 || rows[0].lengths.len() != 1 {
87                    anyhow::bail!(
88                        "Expected 1 row 1 value, got {} rows, {} values",
89                        rows.len(),
90                        rows[0].lengths.len()
91                    );
92                }
93
94                let row = &rows[0];
95                let row_str = from_base64(&row.values);
96                let row_str = String::from_utf8(row_str).unwrap();
97
98                let res = T::custom_parse(&row_str)
99                    .ok()
100                    .context(format!("Failed to deserialize scalar {:?}", row_str))?;
101                return Ok(res);
102            }
103        }
104
105        anyhow::bail!("No results found");
106    }
107}
planetscale_driver/deserializer.rs

planetscale_driver/
deserializer.rs
