native_db 0.8.2

Drop-in embedded database
Documentation 
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use crate::db_type::Result;
use redb::Builder;
use std::path::Path;
use std::path::PathBuf;

pub(crate) struct DatabaseInstance {
    kind: DatabaseInstanceKind,
}

impl DatabaseInstance {
    pub(crate) fn create_on_disk(builder: Builder, path: impl AsRef<Path>) -> Result<Self> {
        let db = builder.create(path.as_ref())?;
        Ok(Self {
            kind: DatabaseInstanceKind::OnDisk {
                redb_database: db,
                path: path.as_ref().to_path_buf(),
            },
        })
    }

    pub(crate) fn open_on_disk(builder: Builder, path: impl AsRef<Path>) -> Result<Self> {
        let db = builder.open(path.as_ref())?;
        Ok(Self {
            kind: DatabaseInstanceKind::OnDisk {
                redb_database: db,
                path: path.as_ref().to_path_buf(),
            },
        })
    }

    pub(crate) fn create_in_memory(builder: Builder) -> Result<Self> {
        let in_memory_backend = redb::backends::InMemoryBackend::new();
        let db = builder.create_with_backend(in_memory_backend)?;
        Ok(Self {
            kind: DatabaseInstanceKind::InMemory { redb_database: db },
        })
    }

    pub(crate) fn redb_database(&self) -> Result<&redb::Database> {
        self.kind.redb_database()
    }

    pub(crate) fn redb_database_mut(&mut self) -> Result<&mut redb::Database> {
        self.kind.redb_database_mut()
    }
}

enum DatabaseInstanceKind {
    InMemory {
        redb_database: redb::Database,
    },
    OnDisk {
        redb_database: redb::Database,
        #[allow(dead_code)]
        path: PathBuf,
    },
}

impl DatabaseInstanceKind {
    pub(crate) fn redb_database(&self) -> Result<&redb::Database> {
        match self {
            DatabaseInstanceKind::InMemory { redb_database } => Ok(redb_database),
            DatabaseInstanceKind::OnDisk { redb_database, .. } => Ok(redb_database),
        }
    }

    pub(crate) fn redb_database_mut(&mut self) -> Result<&mut redb::Database> {
        match self {
            DatabaseInstanceKind::InMemory { redb_database } => Ok(redb_database),
            DatabaseInstanceKind::OnDisk { redb_database, .. } => Ok(redb_database),
        }
    }
}