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

use async_graphql::{
    extensions::{
        Extension, ExtensionContext, ExtensionFactory, NextExecute, NextParseQuery, NextValidation,
    },
    parser::types::{ExecutableDocument, OperationType, Selection},
    Response, ServerError, ServerResult, ValidationResult, Variables,
};
use chrono::{DateTime, Utc};
use rand::Rng;
use std::sync::Arc;
use tokio::sync::Mutex;

pub struct Logger;

impl ExtensionFactory for Logger {
    fn create(&self) -> Arc<dyn Extension> {
        Arc::new(LoggerExtension {})
    }
}

struct LoggerExtension {}

#[derive(Debug, Default)]
pub struct QueryInfo {
    inner: Arc<Mutex<QueryInfoInner>>,
}
impl QueryInfo {
    pub fn new() -> QueryInfo {
        let mut rng = rand::thread_rng();
        QueryInfo {
            inner: Arc::new(Mutex::new(QueryInfoInner {
                id: rng.gen_range(100_000_000..=999_999_999),
                start_time: Utc::now(),
                is_schema: false,
            })),
        }
    }
}

#[derive(Debug, Default)]
pub struct QueryInfoInner {
    id: u64,
    start_time: DateTime<Utc>,
    is_schema: bool,
}

#[async_trait::async_trait]
impl Extension for LoggerExtension {
    async fn validation(
        &self,
        ctx: &ExtensionContext<'_>,
        next: NextValidation<'_>,
    ) -> Result<ValidationResult, Vec<ServerError>> {
        let res = next.run(ctx).await;
        match res {
            Ok(_) => res,
            Err(ref errors) => match ctx.data_opt::<QueryInfo>() {
                Some(qinfo) => {
                    let qinfo = qinfo.inner.lock().await;
                    for e in errors {
                        log::info!(
                            target: "gql_logger",
                            "[QueryID: {}] Validation is failed with reason: {}",
                            qinfo.id,
                            e.message
                        )
                    }
                    res
                }
                None => res,
            },
        }
    }

    async fn parse_query(
        &self,
        ctx: &ExtensionContext<'_>,
        query: &str,
        variables: &Variables,
        next: NextParseQuery<'_>,
    ) -> ServerResult<ExecutableDocument> {
        let document = next.run(ctx, query, variables).await?;
        if let Some(qinfo) = ctx.data_opt::<QueryInfo>() {
            let is_schema = document
            .operations
            .iter()
            .filter(|(_, operation)| operation.node.ty == OperationType::Query)
            .any(|(_, operation)| operation.node.selection_set.node.items.iter().any(
                    |selection| matches!(&selection.node, Selection::Field(field) if field.node.name.node == "__schema")));
            let mut qinfo = qinfo.inner.lock().await;
            qinfo.is_schema = is_schema;
            if is_schema {
                return Ok(document);
            }
            log::info!(target: "gql_logger", "[QueryID: {}] {}", qinfo.id, ctx.stringify_execute_doc(&document, variables));
        }
        Ok(document)
    }

    async fn execute(
        &self,
        ctx: &ExtensionContext<'_>,
        operation_name: Option<&str>,
        next: NextExecute<'_>,
    ) -> Response {
        let resp = next.run(ctx, operation_name).await;
        if let Some(qinfo) = ctx.data_opt::<QueryInfo>() {
            let qinfo = qinfo.inner.lock().await;
            if qinfo.is_schema {
                return resp;
            }
            let query_id = qinfo.id;

            if resp.is_err() {
                for err in &resp.errors {
                    log::info!(
                        target: "gql_logger",
                        "[QueryID: {query_id}] [Error] {}", err.message,
                    );
                }
            }
            let query_start_time = qinfo.start_time;
            let duration = Utc::now() - query_start_time;
            log::info!(
                target: "gql_logger",
                "[QueryID: {query_id}] Duration: {}ms",
                duration.num_milliseconds()
            );
        }

        resp
    }
}