Remove dc_open call

A new context is now created by calling Context::new and therefore you
always have a valid context.  This is much more in Rust style and will
allow a lot of furture simplifications on the context itself.

The FFI layer has not yet been adjusted in this commit and thus will
fail.

deltachat-ffi/src/lib.rs

@@ -34,7 +34,16 @@ use deltachat::*;
 
 pub type dc_context_t = context::Context;
 
-pub type dc_callback_t = types::dc_callback_t;
+/// Callback function that should be given to dc_context_new().
+///
+/// @memberof Context
+/// @param context The context object as returned by dc_context_new().
+/// @param event one of the @ref DC_EVENT constants
+/// @param data1 depends on the event parameter
+/// @param data2 depends on the event parameter
+/// @return return 0 unless stated otherwise in the event parameter documentation
+pub type dc_callback_t =
+    unsafe extern "C" fn(_: &Context, _: Event, _: uintptr_t, _: uintptr_t) -> uintptr_t;
 
 #[no_mangle]
 pub unsafe extern "C" fn dc_context_new(

examples/repl/cmdline.rs

@@ -447,14 +447,6 @@ pub unsafe fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::E
                  ============================================="
             ),
         },
-        "open" => {
-            ensure!(!arg1.is_empty(), "Argument <file> missing");
-            dc_close(context);
-            ensure!(dc_open(context, arg1, None), "Open failed");
-        }
-        "close" => {
-            dc_close(context);
-        }
         "initiate-key-transfer" => {
             let setup_code = dc_initiate_key_transfer(context);
             if !setup_code.is_null() {

examples/repl/main.rs

@@ -15,8 +15,8 @@ extern crate rusqlite;
 
 use std::borrow::Cow::{self, Borrowed, Owned};
 use std::io::{self, Write};
+use std::path::Path;
 use std::process::Command;
-use std::ptr;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex, RwLock};
 
@@ -44,7 +44,7 @@ use self::cmdline::*;
 
 // Event Handler
 
-unsafe extern "C" fn receive_event(
+fn receive_event(
     _context: &Context,
     event: Event,
     data1: uintptr_t,
@@ -387,15 +387,15 @@ impl Highlighter for DcHelper {
 impl Helper for DcHelper {}
 
 fn main_0(args: Vec<String>) -> Result<(), failure::Error> {
-    let mut context = dc_context_new(Some(receive_event), ptr::null_mut(), Some("CLI".into()));
+    if args.len() < 2 {
-
-    if args.len() == 2 {
-        if unsafe { !dc_open(&mut context, &args[1], None) } {
-            println!("Error: Cannot open {}.", args[0],);
-        }
-    } else if args.len() != 1 {
         println!("Error: Bad arguments, expected [db-name].");
+        return Err(format_err!("No db-name specified"));
     }
+    let context = Context::new(
+        Box::new(receive_event),
+        "CLI".into(),
+        Path::new(&args[1]).to_path_buf(),
+    )?;
 
     println!("Delta Chat Core is awaiting your commands.");
 

examples/simple.rs

@@ -16,7 +16,7 @@ use deltachat::job::{
     perform_imap_fetch, perform_imap_idle, perform_imap_jobs, perform_smtp_idle, perform_smtp_jobs,
 };
 
-extern "C" fn cb(_ctx: &Context, event: Event, data1: usize, data2: usize) -> usize {
+fn cb(_ctx: &Context, event: Event, data1: usize, data2: usize) -> usize {
     println!("[{:?}]", event);
 
     match event {
@@ -39,7 +39,11 @@ extern "C" fn cb(_ctx: &Context, event: Event, data1: usize, data2: usize) -> us
 
 fn main() {
     unsafe {
-        let ctx = dc_context_new(Some(cb), std::ptr::null_mut(), None);
+        let dir = tempdir().unwrap();
+        let dbfile = dir.path().join("db.sqlite");
+        println!("creating database {:?}", dbfile);
+        let ctx =
+            Context::new(Box::new(cb), "FakeOs".into(), dbfile).expect("Failed to create context");
         let running = Arc::new(RwLock::new(true));
         let info = dc_get_info(&ctx);
         let info_s = CStr::from_ptr(info);
@@ -73,13 +77,6 @@ fn main() {
             }
         });
 
-        let dir = tempdir().unwrap();
-        let dbfile = dir.path().join("db.sqlite");
-
-        println!("opening database {:?}", dbfile);
-
-        assert!(dc_open(&ctx, dbfile.to_str().unwrap(), None));
-
         println!("configuring");
         let args = std::env::args().collect::<Vec<String>>();
         assert_eq!(args.len(), 2, "missing password");
@@ -130,6 +127,5 @@ fn main() {
         t2.join().unwrap();
 
         println!("closing");
-        dc_close(&ctx);
     }
 }

src/context.rs

@@ -1,3 +1,6 @@
+use std::ffi::OsString;
+use std::path::PathBuf;
+use std::ptr;
 use std::sync::{Arc, Condvar, Mutex, RwLock};
 
 use crate::chat::*;
@@ -5,6 +8,7 @@ use crate::constants::*;
 use crate::contact::*;
 use crate::dc_receive_imf::*;
 use crate::dc_tools::*;
+use crate::error::*;
 use crate::imap::*;
 use crate::job::*;
 use crate::job_thread::JobThread;
@@ -17,9 +21,21 @@ use crate::smtp::*;
 use crate::sql::Sql;
 use crate::types::*;
 use crate::x::*;
-use std::ptr;
 
-use std::path::PathBuf;
+/// Callback function type for [Context]
+///
+/// # Parameters
+///
+/// * `context` - The context object as returned by [Context::new].
+/// * `event` - One of the [Event] items.
+/// * `data1` - Depends on the event parameter, see [Event].
+/// * `data2` - Depends on the event parameter, see [Event].
+///
+/// # Returns
+///
+/// This callback must return 0 unless stated otherwise in the event
+/// description at [Event].
+pub type ContextCallback = dyn Fn(&Context, Event, uintptr_t, uintptr_t) -> uintptr_t;
 
 pub struct Context {
     pub userdata: *mut libc::c_void,
@@ -34,7 +50,7 @@ pub struct Context {
     pub smtp: Arc<Mutex<Smtp>>,
     pub smtp_state: Arc<(Mutex<SmtpState>, Condvar)>,
     pub oauth2_critical: Arc<Mutex<()>>,
-    pub cb: Option<dc_callback_t>,
+    pub cb: Box<ContextCallback>,
     pub os_name: Option<String>,
     pub cmdline_sel_chat_id: Arc<RwLock<u32>>,
     pub bob: Arc<RwLock<BobStatus>>,
@@ -54,75 +70,32 @@ pub struct RunningState {
 }
 
 impl Context {
-    pub fn has_dbfile(&self) -> bool {
+    pub fn new(cb: Box<ContextCallback>, os_name: String, dbfile: PathBuf) -> Result<Context> {
-        self.get_dbfile().is_some()
+        let mut blob_fname = OsString::new();
+        blob_fname.push(dbfile.file_name().unwrap_or_default());
+        blob_fname.push("-blobs");
+        let blobdir = dbfile.with_file_name(blob_fname);
+        if !blobdir.exists() {
+            std::fs::create_dir_all(&blobdir)?;
+        }
+        Context::with_blobdir(cb, os_name, dbfile, blobdir)
     }
 
-    pub fn has_blobdir(&self) -> bool {
+    pub fn with_blobdir(
-        !self.get_blobdir().is_null()
+        cb: Box<ContextCallback>,
-    }
+        os_name: String,
-
+        dbfile: PathBuf,
-    pub fn get_dbfile(&self) -> Option<PathBuf> {
+        blobdir: PathBuf,
-        (*self.dbfile.clone().read().unwrap())
+    ) -> Result<Context> {
-            .as_ref()
+        ensure!(
-            .map(|x| x.clone())
+            blobdir.is_dir(),
-    }
+            "Blobdir does not exist: {}",
-
+            blobdir.display()
-    pub fn get_blobdir(&self) -> *const libc::c_char {
+        );
-        *self.blobdir.clone().read().unwrap()
+        let blobdir_c = blobdir.to_c_string()?;
-    }
+        let ctx = Context {
-
+            blobdir: Arc::new(RwLock::new(unsafe { dc_strdup(blobdir_c.as_ptr()) })),
-    pub fn call_cb(&self, event: Event, data1: uintptr_t, data2: uintptr_t) -> uintptr_t {
+            dbfile: Arc::new(RwLock::new(Some(dbfile))),
-        if let Some(cb) = self.cb {
-            unsafe { cb(self, event, data1, data2) }
-        } else {
-            0
-        }
-    }
-}
-
-impl Drop for Context {
-    fn drop(&mut self) {
-        unsafe {
-            dc_close(&self);
-        }
-    }
-}
-
-impl Default for RunningState {
-    fn default() -> Self {
-        RunningState {
-            ongoing_running: false,
-            shall_stop_ongoing: true,
-        }
-    }
-}
-
-#[derive(Default)]
-pub struct BobStatus {
-    pub expects: i32,
-    pub status: i32,
-    pub qr_scan: Option<Lot>,
-}
-
-#[derive(Default, Debug)]
-pub struct SmtpState {
-    pub idle: bool,
-    pub suspended: bool,
-    pub doing_jobs: bool,
-    pub perform_jobs_needed: i32,
-    pub probe_network: bool,
-}
-
-// create/open/config/information
-pub fn dc_context_new(
-    cb: Option<dc_callback_t>,
-    userdata: *mut libc::c_void,
-    os_name: Option<String>,
-) -> Context {
-    Context {
-        blobdir: Arc::new(RwLock::new(std::ptr::null_mut())),
-        dbfile: Arc::new(RwLock::new(None)),
             inbox: Arc::new(RwLock::new({
                 Imap::new(
                     cb_get_config,
@@ -131,9 +104,9 @@ pub fn dc_context_new(
                     cb_receive_imf,
                 )
             })),
-        userdata,
+            userdata: std::ptr::null_mut(),
             cb,
-        os_name,
+            os_name: Some(os_name),
             running_state: Arc::new(RwLock::new(Default::default())),
             sql: Sql::new(),
             smtp: Arc::new(Mutex::new(Smtp::new())),
@@ -165,7 +138,80 @@ pub fn dc_context_new(
             probe_imap_network: Arc::new(RwLock::new(false)),
             perform_inbox_jobs_needed: Arc::new(RwLock::new(false)),
             generating_key_mutex: Mutex::new(()),
+        };
+        if !ctx
+            .sql
+            .open(&ctx, &ctx.dbfile.read().unwrap().as_ref().unwrap(), 0)
+        {
+            return Err(format_err!("Failed opening sqlite database"));
         }
+        Ok(ctx)
+    }
+
+    pub fn has_dbfile(&self) -> bool {
+        self.get_dbfile().is_some()
+    }
+
+    pub fn has_blobdir(&self) -> bool {
+        !self.get_blobdir().is_null()
+    }
+
+    pub fn get_dbfile(&self) -> Option<PathBuf> {
+        (*self.dbfile.clone().read().unwrap())
+            .as_ref()
+            .map(|x| x.clone())
+    }
+
+    pub fn get_blobdir(&self) -> *const libc::c_char {
+        *self.blobdir.clone().read().unwrap()
+    }
+
+    pub fn call_cb(&self, event: Event, data1: uintptr_t, data2: uintptr_t) -> uintptr_t {
+        (*self.cb)(self, event, data1, data2)
+    }
+}
+
+impl Drop for Context {
+    fn drop(&mut self) {
+        unsafe {
+            info!(self, "disconnecting INBOX-watch",);
+            self.inbox.read().unwrap().disconnect(self);
+            info!(self, "disconnecting sentbox-thread",);
+            self.sentbox_thread.read().unwrap().imap.disconnect(self);
+            info!(self, "disconnecting mvbox-thread",);
+            self.mvbox_thread.read().unwrap().imap.disconnect(self);
+            info!(self, "disconnecting SMTP");
+            self.smtp.clone().lock().unwrap().disconnect();
+            self.sql.close(self);
+            let blobdir = self.blobdir.write().unwrap();
+            free(*blobdir as *mut libc::c_void);
+        }
+    }
+}
+
+impl Default for RunningState {
+    fn default() -> Self {
+        RunningState {
+            ongoing_running: false,
+            shall_stop_ongoing: true,
+        }
+    }
+}
+
+#[derive(Default)]
+pub struct BobStatus {
+    pub expects: i32,
+    pub status: i32,
+    pub qr_scan: Option<Lot>,
+}
+
+#[derive(Default, Debug)]
+pub struct SmtpState {
+    pub idle: bool,
+    pub suspended: bool,
+    pub doing_jobs: bool,
+    pub perform_jobs_needed: i32,
+    pub probe_network: bool,
 }
 
 unsafe fn cb_receive_imf(
@@ -251,70 +297,10 @@ fn cb_get_config(context: &Context, key: &str) -> Option<String> {
     context.sql.get_config(context, key)
 }
 
-pub unsafe fn dc_close(context: &Context) {
-    info!(context, "disconnecting INBOX-watch",);
-    context.inbox.read().unwrap().disconnect(context);
-    info!(context, "disconnecting sentbox-thread",);
-    context
-        .sentbox_thread
-        .read()
-        .unwrap()
-        .imap
-        .disconnect(context);
-    info!(context, "disconnecting mvbox-thread",);
-    context
-        .mvbox_thread
-        .read()
-        .unwrap()
-        .imap
-        .disconnect(context);
-
-    info!(context, "disconnecting SMTP");
-    context.smtp.clone().lock().unwrap().disconnect();
-
-    context.sql.close(context);
-    let mut dbfile = context.dbfile.write().unwrap();
-    *dbfile = None;
-    let mut blobdir = context.blobdir.write().unwrap();
-    free(*blobdir as *mut libc::c_void);
-    *blobdir = ptr::null_mut();
-}
-
-pub unsafe fn dc_is_open(context: &Context) -> libc::c_int {
-    context.sql.is_open() as libc::c_int
-}
-
 pub unsafe fn dc_get_userdata(context: &mut Context) -> *mut libc::c_void {
     context.userdata as *mut _
 }
 
-pub unsafe fn dc_open(context: &Context, dbfile: &str, blobdir: Option<&str>) -> bool {
-    let mut success = false;
-    if 0 != dc_is_open(context) {
-        return false;
-    }
-
-    *context.dbfile.write().unwrap() = Some(PathBuf::from(dbfile));
-    let blobdir = blobdir.unwrap_or_default();
-    if !blobdir.is_empty() {
-        let dir = dc_ensure_no_slash_safe(blobdir).strdup();
-        *context.blobdir.write().unwrap() = dir;
-    } else {
-        let dir = dbfile.to_string() + "-blobs";
-        dc_create_folder(context, &dir);
-        *context.blobdir.write().unwrap() = dir.strdup();
-    }
-    // Create/open sqlite database, this may already use the blobdir
-    let dbfile_path = std::path::Path::new(dbfile);
-    if context.sql.open(context, dbfile_path, 0) {
-        success = true
-    }
-    if !success {
-        dc_close(context);
-    }
-    success
-}
-
 pub unsafe fn dc_get_blobdir(context: &Context) -> *mut libc::c_char {
     dc_strdup(*context.blobdir.clone().read().unwrap())
 }
@@ -607,19 +593,59 @@ pub fn do_heuristics_moves(context: &Context, folder: &str, msg_id: u32) {
 mod tests {
     use super::*;
 
+    use crate::test_utils::*;
+
     #[test]
-    fn no_crashes_on_context_deref() {
+    fn test_wrong_db() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), Some("Test OS".into()));
+        let tmp = tempfile::tempdir().unwrap();
-        std::mem::drop(ctx);
+        let dbfile = tmp.path().join("db.sqlite");
+        std::fs::write(&dbfile, b"123").unwrap();
+        let res = Context::new(Box::new(|_, _, _, _| 0), "FakeOs".into(), dbfile);
+        assert!(res.is_err());
     }
 
     #[test]
-    fn test_context_double_close() {
+    fn test_blobdir_exists() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let tmp = tempfile::tempdir().unwrap();
-        unsafe {
+        let dbfile = tmp.path().join("db.sqlite");
-            dc_close(&ctx);
+        Context::new(Box::new(|_, _, _, _| 0), "FakeOS".into(), dbfile).unwrap();
-            dc_close(&ctx);
+        let blobdir = tmp.path().join("db.sqlite-blobs");
+        assert!(blobdir.is_dir());
     }
-        std::mem::drop(ctx);
+
+    #[test]
+    fn test_wrong_blogdir() {
+        let tmp = tempfile::tempdir().unwrap();
+        let dbfile = tmp.path().join("db.sqlite");
+        let blobdir = tmp.path().join("db.sqlite-blobs");
+        std::fs::write(&blobdir, b"123").unwrap();
+        let res = Context::new(Box::new(|_, _, _, _| 0), "FakeOS".into(), dbfile);
+        assert!(res.is_err());
+    }
+
+    #[test]
+    fn test_sqlite_parent_not_exists() {
+        let tmp = tempfile::tempdir().unwrap();
+        let subdir = tmp.path().join("subdir");
+        let dbfile = subdir.join("db.sqlite");
+        let dbfile2 = dbfile.clone();
+        Context::new(Box::new(|_, _, _, _| 0), "FakeOS".into(), dbfile).unwrap();
+        assert!(subdir.is_dir());
+        assert!(dbfile2.is_file());
+    }
+
+    #[test]
+    fn test_with_blobdir_not_exists() {
+        let tmp = tempfile::tempdir().unwrap();
+        let dbfile = tmp.path().join("db.sqlite");
+        let blobdir = tmp.path().join("blobs");
+        let res = Context::with_blobdir(Box::new(|_, _, _, _| 0), "FakeOS".into(), dbfile, blobdir);
+        assert!(res.is_err());
+    }
+
+    #[test]
+    fn no_crashes_on_context_deref() {
+        let t = dummy_context();
+        std::mem::drop(t.ctx);
     }
 }

src/dc_imex.rs

@@ -1110,7 +1110,7 @@ mod tests {
 
     #[test]
     fn test_render_setup_file() {
-        let t = test_context(Some(logging_cb));
+        let t = test_context(Some(Box::new(logging_cb)));
 
         configure_alice_keypair(&t.ctx);
         let msg = dc_render_setup_file(&t.ctx, "hello").unwrap();
@@ -1128,14 +1128,9 @@ mod tests {
         assert!(msg.contains("-----END PGP MESSAGE-----\n"));
     }
 
-    unsafe extern "C" fn ac_setup_msg_cb(
+    fn ac_setup_msg_cb(ctx: &Context, evt: Event, d1: uintptr_t, d2: uintptr_t) -> uintptr_t {
-        ctx: &Context,
-        evt: Event,
-        d1: uintptr_t,
-        d2: uintptr_t,
-    ) -> uintptr_t {
         if evt == Event::GET_STRING && d1 == StockMessage::AcSetupMsgBody.to_usize().unwrap() {
-            "hello\r\nthere".strdup() as usize
+            unsafe { "hello\r\nthere".strdup() as usize }
         } else {
             logging_cb(ctx, evt, d1, d2)
         }
@@ -1143,7 +1138,7 @@ mod tests {
 
     #[test]
     fn test_render_setup_file_newline_replace() {
-        let t = test_context(Some(ac_setup_msg_cb));
+        let t = test_context(Some(Box::new(ac_setup_msg_cb)));
         configure_alice_keypair(&t.ctx);
         let msg = dc_render_setup_file(&t.ctx, "pw").unwrap();
         println!("{}", &msg);

src/error.rs

@@ -22,6 +22,8 @@ pub enum Error {
     Image(image_meta::ImageError),
     #[fail(display = "{:?}", _0)]
     Utf8(std::str::Utf8Error),
+    #[fail(display = "{:?}", _0)]
+    CStringError(crate::dc_tools::CStringError),
 }
 
 pub type Result<T> = std::result::Result<T, Error>;
@@ -62,6 +64,12 @@ impl From<image_meta::ImageError> for Error {
     }
 }
 
+impl From<crate::dc_tools::CStringError> for Error {
+    fn from(err: crate::dc_tools::CStringError) -> Error {
+        Error::CStringError(err)
+    }
+}
+
 #[macro_export]
 macro_rules! bail {
     ($e:expr) => {

src/stock.rs

@@ -237,10 +237,8 @@ mod tests {
     use super::*;
     use crate::test_utils::*;
 
-    use std::ffi::CString;
 
     use crate::constants::DC_CONTACT_ID_SELF;
-    use crate::context::dc_context_new;
     use crate::types::uintptr_t;
 
     use num_traits::ToPrimitive;
@@ -258,19 +256,18 @@ mod tests {
 
     #[test]
     fn test_stock_str() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let t = dummy_context();
-        assert_eq!(ctx.stock_str(StockMessage::NoMessages), "No messages.");
+        assert_eq!(t.ctx.stock_str(StockMessage::NoMessages), "No messages.");
     }
 
-    unsafe extern "C" fn test_stock_str_no_fallback_cb(
+    fn test_stock_str_no_fallback_cb(
         _ctx: &Context,
         evt: Event,
         d1: uintptr_t,
         _d2: uintptr_t,
     ) -> uintptr_t {
         if evt == Event::GET_STRING && d1 == StockMessage::NoMessages.to_usize().unwrap() {
-            let tmp = CString::new("Hello there").unwrap();
+            unsafe { "Hello there".strdup() as usize }
-            dc_strdup(tmp.as_ptr()) as usize
         } else {
             0
         }
@@ -278,16 +275,16 @@ mod tests {
 
     #[test]
     fn test_stock_str_no_fallback() {
-        let t = test_context(Some(test_stock_str_no_fallback_cb));
+        let t = test_context(Some(Box::new(test_stock_str_no_fallback_cb)));
         assert_eq!(t.ctx.stock_str(StockMessage::NoMessages), "Hello there");
     }
 
     #[test]
     fn test_stock_string_repl_str() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let t = dummy_context();
         // uses %1$s substitution
         assert_eq!(
-            ctx.stock_string_repl_str(StockMessage::Member, "42"),
+            t.ctx.stock_string_repl_str(StockMessage::Member, "42"),
             "42 member(s)"
         );
         // We have no string using %1$d to test...
@@ -295,36 +292,38 @@ mod tests {
 
     #[test]
     fn test_stock_string_repl_int() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let t = dummy_context();
         assert_eq!(
-            ctx.stock_string_repl_int(StockMessage::Member, 42),
+            t.ctx.stock_string_repl_int(StockMessage::Member, 42),
             "42 member(s)"
         );
     }
 
     #[test]
     fn test_stock_string_repl_str2() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let t = dummy_context();
         assert_eq!(
-            ctx.stock_string_repl_str2(StockMessage::ServerResponse, "foo", "bar"),
+            t.ctx
+                .stock_string_repl_str2(StockMessage::ServerResponse, "foo", "bar"),
             "Response from foo: bar"
         );
     }
 
     #[test]
     fn test_stock_system_msg_simple() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let t = dummy_context();
         assert_eq!(
-            ctx.stock_system_msg(StockMessage::MsgLocationEnabled, "", "", 0),
+            t.ctx
+                .stock_system_msg(StockMessage::MsgLocationEnabled, "", "", 0),
             "Location streaming enabled."
         )
     }
 
     #[test]
     fn test_stock_system_msg_add_member_by_me() {
-        let ctx = dc_context_new(None, std::ptr::null_mut(), None);
+        let t = dummy_context();
         assert_eq!(
-            ctx.stock_system_msg(
+            t.ctx.stock_system_msg(
                 StockMessage::MsgAddMember,
                 "alice@example.com",
                 "",

src/test_utils.rs

@@ -9,9 +9,8 @@ use tempfile::{tempdir, TempDir};
 
 use crate::config::Config;
 use crate::constants::{Event, KeyType};
-use crate::context::{dc_context_new, dc_open, Context};
+use crate::context::{Context, ContextCallback};
 use crate::key;
-use crate::types::dc_callback_t;
 
 /// A Context and temporary directory.
 ///
@@ -28,18 +27,15 @@ pub struct TestContext {
 /// "db.sqlite" in the [TestContext.dir] directory.
 ///
 /// [Context]: crate::context::Context
-pub fn test_context(cb: Option<dc_callback_t>) -> TestContext {
+pub fn test_context(callback: Option<Box<ContextCallback>>) -> TestContext {
-    unsafe {
-        let mut ctx = dc_context_new(cb, std::ptr::null_mut(), None);
     let dir = tempdir().unwrap();
     let dbfile = dir.path().join("db.sqlite");
-        assert!(
+    let cb: Box<ContextCallback> = match callback {
-            dc_open(&mut ctx, dbfile.to_str().unwrap(), None),
+        Some(cb) => cb,
-            "Failed to open {}",
+        None => Box::new(|_, _, _, _| 0),
-            dbfile.display(),
+    };
-        );
+    let ctx = Context::new(cb, "FakeOs".into(), dbfile).unwrap();
     TestContext { ctx: ctx, dir: dir }
-    }
 }
 
 /// Return a dummy [TestContext].
@@ -51,13 +47,8 @@ pub fn dummy_context() -> TestContext {
     test_context(None)
 }
 
-pub unsafe extern "C" fn logging_cb(
+pub fn logging_cb(_ctx: &Context, evt: Event, _d1: uintptr_t, d2: uintptr_t) -> uintptr_t {
-    _ctx: &Context,
+    let to_str = unsafe { |x| CStr::from_ptr(x as *const libc::c_char).to_str().unwrap() };
-    evt: Event,
-    _d1: uintptr_t,
-    d2: uintptr_t,
-) -> uintptr_t {
-    let to_str = |x| CStr::from_ptr(x as *const libc::c_char).to_str().unwrap();
     match evt {
         Event::INFO => println!("I: {}", to_str(d2)),
         Event::WARNING => println!("W: {}", to_str(d2)),

src/types.rs

@@ -1,21 +1,9 @@
 #![allow(non_camel_case_types)]
-use crate::constants::Event;
 use crate::context::Context;
 
 pub use mmime::clist::*;
 pub use rusqlite::ffi::*;
 
-/// Callback function that should be given to dc_context_new().
-///
-/// @memberof Context
-/// @param context The context object as returned by dc_context_new().
-/// @param event one of the @ref DC_EVENT constants
-/// @param data1 depends on the event parameter
-/// @param data2 depends on the event parameter
-/// @return return 0 unless stated otherwise in the event parameter documentation
-pub type dc_callback_t =
-    unsafe extern "C" fn(_: &Context, _: Event, _: uintptr_t, _: uintptr_t) -> uintptr_t;
-
 pub type dc_receive_imf_t = unsafe fn(
     _: &Context,
     _: *const libc::c_char,

tests/stress.rs

@@ -30,7 +30,6 @@ static mut S_EM_SETUPFILE: *const libc::c_char =
         as *const u8 as *const libc::c_char;
 
 unsafe fn stress_functions(context: &Context) {
-    if 0 != dc_is_open(context) {
     if dc_file_exist(context, "$BLOBDIR/foobar")
         || dc_file_exist(context, "$BLOBDIR/dada")
         || dc_file_exist(context, "$BLOBDIR/foobar.dadada")
@@ -126,7 +125,6 @@ unsafe fn stress_functions(context: &Context) {
     assert!(dc_delete_file(context, as_path(fn0)));
     free(fn0 as *mut libc::c_void);
     free(fn1 as *mut libc::c_void);
-    }
 
     let res = context.get_config(config::Config::SysConfigKeys).unwrap();
 
@@ -567,12 +565,7 @@ fn test_encryption_decryption() {
     assert_eq!(plain, original_text);
 }
 
-unsafe extern "C" fn cb(
+fn cb(_context: &Context, _event: Event, _data1: uintptr_t, _data2: uintptr_t) -> uintptr_t {
-    _context: &Context,
-    _event: Event,
-    _data1: uintptr_t,
-    _data2: uintptr_t,
-) -> uintptr_t {
     0
 }
 
@@ -582,21 +575,16 @@ struct TestContext {
     dir: TempDir,
 }
 
-unsafe fn create_test_context() -> TestContext {
+fn create_test_context() -> TestContext {
-    let mut ctx = dc_context_new(Some(cb), std::ptr::null_mut(), None);
     let dir = tempdir().unwrap();
     let dbfile = dir.path().join("db.sqlite");
-    assert!(
+    let ctx = Context::new(Box::new(cb), "FakeOs".into(), dbfile).unwrap();
-        dc_open(&mut ctx, dbfile.to_str().unwrap(), None),
-        "Failed to open {}",
-        dbfile.display()
-    );
     TestContext { ctx: ctx, dir: dir }
 }
 
 #[test]
 fn test_dc_get_oauth2_url() {
-    let ctx = unsafe { create_test_context() };
+    let ctx = create_test_context();
     let addr = "dignifiedquire@gmail.com";
     let redirect_uri = "chat.delta:/com.b44t.messenger";
     let res = dc_get_oauth2_url(&ctx.ctx, addr, redirect_uri);
@@ -606,7 +594,7 @@ fn test_dc_get_oauth2_url() {
 
 #[test]
 fn test_dc_get_oauth2_addr() {
-    let ctx = unsafe { create_test_context() };
+    let ctx = create_test_context();
     let addr = "dignifiedquire@gmail.com";
     let code = "fail";
     let res = dc_get_oauth2_addr(&ctx.ctx, addr, code);
@@ -616,7 +604,7 @@ fn test_dc_get_oauth2_addr() {
 
 #[test]
 fn test_dc_get_oauth2_token() {
-    let ctx = unsafe { create_test_context() };
+    let ctx = create_test_context();
     let addr = "dignifiedquire@gmail.com";
     let code = "fail";
     let res = dc_get_oauth2_access_token(&ctx.ctx, addr, code, 0);
@@ -634,7 +622,6 @@ fn test_stress_tests() {
 
 #[test]
 fn test_get_contacts() {
-    unsafe {
     let context = create_test_context();
     let contacts = Contact::get_all(&context.ctx, 0, Some("some2")).unwrap();
     assert_eq!(contacts.len(), 0);
@@ -647,12 +634,10 @@ fn test_get_contacts() {
 
     let contacts = Contact::get_all(&context.ctx, 0, Some("alice")).unwrap();
     assert_eq!(contacts.len(), 0);
-    }
 }
 
 #[test]
 fn test_chat() {
-    unsafe {
     let context = create_test_context();
     let contact1 = Contact::create(&context.ctx, "bob", "bob@mail.de").unwrap();
     assert_ne!(contact1, 0);
@@ -666,18 +651,4 @@ fn test_chat() {
     let chat2 = Chat::load_from_db(&context.ctx, chat2_id).unwrap();
 
     assert_eq!(chat2.name, chat.name);
-    }
-}
-
-#[test]
-fn test_wrong_db() {
-    unsafe {
-        let mut ctx = dc_context_new(Some(cb), std::ptr::null_mut(), None);
-        let dir = tempdir().unwrap();
-        let dbfile = dir.path().join("db.sqlite");
-        std::fs::write(&dbfile, b"123").unwrap();
-
-        let res = dc_open(&mut ctx, dbfile.to_str().unwrap(), None);
-        assert!(!res);
-    }
 }