daml-bridge 0.2.0

Daml JSON<>GRPC bridge
Documentation 
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

use crate::aliases::{BridgeConfig, GrpcClient};
use crate::handler::common::{internal_server_error, parse_auth_header, JsonResult};
use daml_grpc::data::party::DamlPartyDetails;
use daml_json::data::DamlJsonParty;
use daml_json::request::{
    make_single_warning, DamlJsonAllocatePartyRequest, DamlJsonAllocatePartyResponse, DamlJsonFetchPartiesRequest,
    DamlJsonFetchPartiesResponse,
};

/// DOCME
pub struct PartiesHandler {
    _config: BridgeConfig,
    client: GrpcClient,
}

impl PartiesHandler {
    pub fn new(_config: BridgeConfig, client: GrpcClient) -> Self {
        Self {
            _config,
            client,
        }
    }

    /// DOCME
    pub async fn fetch_parties(
        &self,
        fetch_request: DamlJsonFetchPartiesRequest,
        auth_header: Option<&str>,
    ) -> JsonResult<DamlJsonFetchPartiesResponse> {
        let expected = fetch_request.0.clone();
        let parties = self.execute_fetch(fetch_request, auth_header).await?;
        Ok(make_fetch_response(&parties, &expected))
    }

    /// DOCME
    pub async fn fetch_all_parties(&self, auth_header: Option<&str>) -> JsonResult<DamlJsonFetchPartiesResponse> {
        let parties = self.execute_fetch_all(auth_header).await?;
        Ok(make_fetch_response(&parties, &[]))
    }

    /// DOCME
    pub async fn allocate_parties(
        &self,
        allocate_request: DamlJsonAllocatePartyRequest,
        auth_header: Option<&str>,
    ) -> JsonResult<DamlJsonAllocatePartyResponse> {
        let parties = self.execute_allocate(allocate_request, auth_header).await?;
        Ok(make_allocate_response(&parties))
    }

    async fn execute_fetch(
        &self,
        fetch_request: DamlJsonFetchPartiesRequest,
        auth_header: Option<&str>,
    ) -> JsonResult<Vec<DamlPartyDetails>> {
        let (token, _) = parse_auth_header(auth_header)?;
        self.client
            .party_management_service()
            .with_token(token)
            .get_parties(fetch_request.0)
            .await
            .map_err(internal_server_error)
    }

    async fn execute_fetch_all(&self, auth_header: Option<&str>) -> JsonResult<Vec<DamlPartyDetails>> {
        let (token, _) = parse_auth_header(auth_header)?;
        self.client
            .party_management_service()
            .with_token(token)
            .list_known_parties()
            .await
            .map_err(internal_server_error)
    }

    async fn execute_allocate(
        &self,
        allocate_request: DamlJsonAllocatePartyRequest,
        auth_header: Option<&str>,
    ) -> JsonResult<DamlPartyDetails> {
        let (token, _) = parse_auth_header(auth_header)?;
        self.client
            .party_management_service()
            .with_token(token)
            .allocate_party(
                allocate_request.identifier_hint.unwrap_or_default(),
                allocate_request.display_name.unwrap_or_default(),
            )
            .await
            .map_err(internal_server_error)
    }
}

fn make_fetch_response(parties: &[DamlPartyDetails], expected: &[String]) -> DamlJsonFetchPartiesResponse {
    let missing_parties = find_missing_parties(parties, expected);
    let warnings = if missing_parties.is_empty() {
        None
    } else {
        Some(make_single_warning("unknownParties", missing_parties))
    };
    DamlJsonFetchPartiesResponse {
        status: 200,
        result: parties.iter().map(to_json_party).collect(),
        warnings,
    }
}

fn make_allocate_response(allocated_party: &DamlPartyDetails) -> DamlJsonAllocatePartyResponse {
    DamlJsonAllocatePartyResponse {
        status: 200,
        result: to_json_party(allocated_party),
        warnings: None,
    }
}

fn find_missing_parties(parties: &[DamlPartyDetails], expected: &[String]) -> Vec<String> {
    expected
        .iter()
        .filter_map(|p| {
            if parties.iter().all(|pd| pd.party() != *p) {
                Some(String::from(p))
            } else {
                None
            }
        })
        .collect()
}

fn to_json_party(party: &DamlPartyDetails) -> DamlJsonParty {
    DamlJsonParty::new(party.party(), party.display_name(), party.is_local())
}