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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
//! Ditto Builder
//!
//! Provides idiomatic configuration of a Ditto instance using the "Builder
//! Pattern"

use ffi_sdk::Platform;

use super::*;
use crate::identity::Identity;

/// Builder for [`Ditto`]
pub struct DittoBuilder {
    ditto_root: Option<Arc<dyn DittoRoot>>,
    identity: Option<Arc<dyn Identity>>,
    minimum_log_level: LogLevel,
    transport_config: Option<TransportConfig>,
}

impl DittoBuilder {
    /// Create a new, empty builder for a [`Ditto`](crate::prelude::Ditto) instance.
    pub fn new() -> DittoBuilder {
        DittoBuilder {
            ditto_root: None,
            identity: None,
            minimum_log_level: LogLevel::Info,
            transport_config: None,
        }
    }

    /// Set the root directory where Ditto will store its data.
    pub fn with_root(mut self, ditto_root: Arc<dyn DittoRoot>) -> Self {
        self.ditto_root = Some(ditto_root);
        self
    }

    /// Configure the minimum log level for the [`Ditto`](crate::prelude::Ditto) instance.
    pub fn with_minimum_log_level(mut self, log_level: LogLevel) -> Self {
        self.minimum_log_level = log_level;
        self
    }

    /// Build a [`Ditto`](crate::prelude::Ditto) instance with a temporary storage directory which
    /// will be destroyed on exit.
    pub fn with_temp_dir(mut self) -> Self {
        let root = TempRoot::new();
        self.ditto_root = Some(Arc::new(root));
        self
    }

    fn platform() -> Platform {
        using!(match () {
            use ffi_sdk::Platform;
            | _case if cfg!(target_os = "windows") => Platform::Windows,
            | _case if cfg!(target_os = "android") => Platform::Android,
            | _case if cfg!(target_os = "macos") => Platform::Mac,
            | _case if cfg!(target_os = "ios") => Platform::Ios,
            | _case if cfg!(target_os = "linux") => Platform::Linux,
            | _default => Platform::Unknown,
        })
    }

    fn sdk_version() -> String {
        let sdk_semver = env!("CARGO_PKG_VERSION");
        sdk_semver.to_string()
    }

    fn init_sdk_version() {
        let platform = Self::platform();
        let sdk_semver = Self::sdk_version();
        let c_version = char_p::new(sdk_semver);
        unsafe {
            ffi_sdk::ditto_init_sdk_version(platform, ffi_sdk::Language::Rust, c_version.as_ref());
        }
    }

    fn init_logging(&self) {
        unsafe {
            ffi_sdk::ditto_logger_init();
            ffi_sdk::ditto_logger_minimum_log_level(self.minimum_log_level);
            ffi_sdk::ditto_logger_enabled(true);
        }
    }

    /// Provide a factory [`FnOnce`] which will create and configure the
    /// [`Identity`](crate::prelude::Identity) for the [`Ditto`](crate::prelude::Ditto) instance.
    pub fn with_identity<F, I>(mut self, factory: F) -> Result<Self, DittoError>
    where
        F: FnOnce(Arc<dyn DittoRoot>) -> Result<I, DittoError>,
        I: Identity + 'static, // must return something ownable
    {
        match &self.ditto_root {
            Some(root) => {
                let identity = factory(root.retain())?;
                self.identity = Some(Arc::new(identity));
            }
            None => {
                let msg = "A valid DittoRoot directory must be provided before configuring the \
                           Identity"
                    .to_string();
                return Err(DittoError::new(ErrorKind::Config, msg));
            }
        };
        Ok(self)
    }

    /// Provide a factory for the [`TransportConfig`](crate::prelude::TransportConfig) used by the
    /// [`Ditto`](crate::prelude::Ditto) instance.
    pub fn with_transport_config<T>(mut self, factory: T) -> Result<Self, DittoError>
    where
        T: FnOnce(Arc<dyn Identity>) -> TransportConfig,
    {
        match &self.identity {
            Some(id) => {
                let config = factory(id.retain());
                self.transport_config = Some(config)
            }
            None => {
                let msg = "A DittoRoot directory and Identity must first be specified before \
                           providing a custom TransportConfig"
                    .to_string();
                return Err(DittoError::new(ErrorKind::Config, msg));
            }
        }
        Ok(self)
    }

    /// Builds the [`Ditto`](crate::prelude::Ditto) instance, consuming the builder the process.
    pub fn build(self) -> Result<Ditto, DittoError> {
        self.init_logging();
        Self::init_sdk_version();
        let ditto_root = self.ditto_root.ok_or_else(|| {
            DittoError::new(ErrorKind::Config, "No Ditto Root Directory provided")
        })?;

        crate::fs::drain_ditto_data_dir(&ditto_root);

        let c_root_dir = ditto_root.root_dir_to_c_str()?;
        let identity = self
            .identity
            .ok_or_else(|| DittoError::new(ErrorKind::Config, "No Identity specified"))?;
        let auth_client_ref: &ffi_sdk::AuthClient = &identity.auth_client();
        let uninit_ditto = unsafe {
            let executor = ffi_sdk::ditto_auth_extract_executor(auth_client_ref);
            ffi_sdk::uninitialized_ditto_make_with_executor(c_root_dir.as_ref(), executor)
        };
        let boxed_ditto = unsafe {
            ffi_sdk::ditto_make(
                uninit_ditto,
                auth_client_ref,
                ffi_sdk::HistoryTracking::Disabled,
            )
        };
        let ditto: DittoHandleWrapper = Arc::new(boxed_ditto);
        let site_id: SiteId = identity.site_id();
        let store = Store::new(ditto.retain());
        let transport_config = self.transport_config.unwrap_or_else(|| {
            let mut config = TransportConfig::new();
            config.enable_all_peer_to_peer();
            config
        });
        let transports: Arc<RwLock<TransportSync>> = Arc::new(RwLock::new(
            TransportSync::from_config(transport_config, ditto.retain(), identity.retain()),
        ));

        let auth = identity.authenticator();
        let validity_listener = identity.make_listener(Arc::downgrade(&transports));
        let presence = Arc::new(Presence::new(ditto.retain()));

        let disk_usage = DiskUsage::new(ditto.retain(), FsComponent::Root);

        let fields_from_auth = |auth| DittoFields {
            ditto,
            auth,
            identity: identity.retain(),
            store,
            activated: identity.requires_offline_only_license_token().not().into(),
            site_id,
            transports,
            ditto_root,
            validity_listener,
            presence,
            disk_usage,
        };
        let fields = if let Some(mut auth) = auth {
            Arc::new_cyclic(|weak_fields: &arc::Weak<_>| {
                auth.ditto_fields = weak_fields.clone();
                fields_from_auth(Some(auth))
            })
        } else {
            Arc::new(fields_from_auth(None))
        };

        let sdk_ditto = Ditto { fields };
        Ok(sdk_ditto)
    }
}

impl Default for DittoBuilder {
    fn default() -> Self {
        Self::new()
    }
}