1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134

use anyhow::Result;
use colored::Colorize;

use log::{debug, info};

use crate::diff::diff_output::DiffOutput;
use crate::diff::sequence::query::input::{QueryAllSequencesInput, QueryLastValuesInput};
use crate::diff::sequence::query::output::{SequenceCountDiff, SequenceDiffOutput, SequenceSource};
use tokio::time::Instant;

use crate::diff::sequence::query::sequence_query_executor::{
    SequenceDualSourceQueryExecutor, SequenceSingleSourceQueryExecutor,
};
use crate::diff::sequence::query::sequence_types::SequenceName;
use crate::diff::types::SchemaName;

pub struct SequenceDiffer<
    SQE: SequenceSingleSourceQueryExecutor,
    DSQE: SequenceDualSourceQueryExecutor,
> {
    single_sequence_query_executor: SQE,
    dual_sequence_query_executor: DSQE,
}

impl<SQE: SequenceSingleSourceQueryExecutor, DSQE: SequenceDualSourceQueryExecutor>
SequenceDiffer<SQE, DSQE>
{
    pub fn new(single_sequence_query_executor: SQE, dual_sequence_query_executor: DSQE) -> Self {
        Self {
            single_sequence_query_executor,
            dual_sequence_query_executor,
        }
    }

    pub async fn diff_all_sequences(&self, schema_name: String) -> Result<Vec<DiffOutput>> {
        info!("{}", "Starting sequence analysis.".bold().red());
        let mut sequences = self.get_all_sequences(schema_name.to_owned()).await?;

        sequences.sort_by_key(|s| s.to_lowercase());

        let sorted_sequences = sequences.to_owned();

        let futures = sorted_sequences.iter().map(|sequence_name| async {
            let start = Instant::now();

            let schema_name = SchemaName::new(schema_name.to_owned());
            let sequence_name = SequenceName::new(sequence_name.to_owned());
            let input = QueryLastValuesInput::new(schema_name, sequence_name.to_owned());
            let (first_result, second_result) = self
                .dual_sequence_query_executor
                .query_sequence_last_values(input)
                .await;

            info!(
                "{}",
                format!("Analyzing sequence: {}", &sequence_name.name())
                    .yellow()
                    .bold()
            );

            let sequence_diff_result =
                Self::extract_result(sequence_name.name(), first_result, second_result);

            let elapsed = start.elapsed();
            debug!(
                "{}",
                format!("Sequence analysis completed in: {}ms", elapsed.as_millis())
            );
            info!("##############################################");

            sequence_diff_result
        });

        info!(
            "{}",
            "Waiting for total sequence analysis to complete."
                .yellow()
                .bold()
        );
        let start = Instant::now();
        let sequences_analysed = futures::future::join_all(futures).await;
        let elapsed = start.elapsed();
        debug!(
            "{}",
            format!(
                "Total sequence analysis completed in: {}ms",
                elapsed.as_millis()
            )
            .yellow()
            .bold(),
        );

        for sequence_diff_result in &sequences_analysed {
            info!("{}", sequence_diff_result.to_string());
        }

        Ok(
            sequences_analysed
                .into_iter()
                .map(|diff| diff.into())
                .collect()
        )
    }

    pub async fn get_all_sequences(&self, schema_name: String) -> Result<Vec<String>> {
        let input = QueryAllSequencesInput::new(SchemaName::new(schema_name));
        let query_result = self
            .single_sequence_query_executor
            .query_sequence_names(input)
            .await;
        Ok(query_result)
    }

    fn extract_result(
        sequence_name: String,
        first_result: Result<i64>,
        second_result: Result<i64>,
    ) -> SequenceDiffOutput {
        match (first_result, second_result) {
            (Ok(first_value), Ok(second_value)) => {
                if first_value != second_value {
                    SequenceDiffOutput::Diff(
                        sequence_name,
                        SequenceCountDiff::new(first_value, second_value),
                    )
                } else {
                    SequenceDiffOutput::NoDiff(sequence_name)
                }
            }
            (Err(_e), _) => SequenceDiffOutput::NotExists(sequence_name, SequenceSource::First),
            (_, Err(_e)) => SequenceDiffOutput::NotExists(sequence_name, SequenceSource::Second),
        }
    }
}