Greatly reduce implementation of chrono types.

Limit ToSql/FromSql to string representations, and limit allowed string
representations to RFC3339 (if a timezone is expected) and SQLite's
`datetime()` format (if not).

src/types/chrono.rs

@@ -1,19 +1,13 @@
 //! Convert most of the [Time Strings](http://sqlite.org/lang_datefunc.html) to chrono types.
 extern crate chrono;
 
-use std::error;
 use self::chrono::{NaiveDate, NaiveTime, NaiveDateTime, DateTime, TimeZone, UTC, Local};
 use libc::c_int;
 
 use {Error, Result};
 use types::{FromSql, ToSql};
 
-use ffi;
 use ffi::sqlite3_stmt;
-use ffi::sqlite3_column_type;
-
-const JULIAN_DAY: f64 = 2440587.5; // 1970-01-01 00:00:00 is JD 2440587.5
-const DAY_IN_SECONDS: f64 = 86400.0;
 
 /// ISO 8601 calendar date without timezone => "YYYY-MM-DD"
 impl ToSql for NaiveDate {
@@ -69,158 +63,67 @@ impl FromSql for NaiveTime {
 /// ISO 8601 combined date and time without timezone => "YYYY-MM-DD HH:MM:SS.SSS"
 impl ToSql for NaiveDateTime {
     unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
-        let date_str = self.format("%Y-%m-%d %H:%M:%S%.f").to_string();
+        let date_str = self.format("%Y-%m-%dT%H:%M:%S%.f").to_string();
         date_str.bind_parameter(stmt, col)
     }
 }
 
-/// "YYYY-MM-DD HH:MM"/"YYYY-MM-DD HH:MM:SS"/"YYYY-MM-DD HH:MM:SS.SSS"/ Julian Day / Unix Time => ISO 8601 combined date and time without timezone.
+/// "YYYY-MM-DD HH:MM:SS"/"YYYY-MM-DD HH:MM:SS.SSS" => ISO 8601 combined date and time without timezone.
-/// ("YYYY-MM-DDTHH:MM"/"YYYY-MM-DDTHH:MM:SS"/"YYYY-MM-DDTHH:MM:SS.SSS" also supported)
+/// ("YYYY-MM-DDTHH:MM:SS"/"YYYY-MM-DDTHH:MM:SS.SSS" also supported)
 impl FromSql for NaiveDateTime {
     unsafe fn column_result(stmt: *mut sqlite3_stmt, col: c_int) -> Result<NaiveDateTime> {
-        match sqlite3_column_type(stmt, col) {
-            ffi::SQLITE_TEXT => {
         let s = try!(String::column_result(stmt, col));
-                let fmt = match s.len() {
+
-                    16 => {
+        let fmt = if s.len() >= 11 && s.as_bytes()[10] == b'T' {
-                        match s.as_bytes()[10] {
+            "%Y-%m-%dT%H:%M:%S%.f"
-                            b'T' => "%Y-%m-%dT%H:%M",
+        } else {
-                            _ => "%Y-%m-%d %H:%M",
+            "%Y-%m-%d %H:%M:%S%.f"
-                        }
-                    }
-                    19 => {
-                        match s.as_bytes()[10] {
-                            b'T' => "%Y-%m-%dT%H:%M:%S",
-                            _ => "%Y-%m-%d %H:%M:%S",
-                        }
-                    }
-                    _ => {
-                        match s.as_bytes()[10] {
-                            b'T' => "%Y-%m-%dT%H:%M:%S%.f",
-                            _ => "%Y-%m-%d %H:%M:%S%.f",
-                        }
-                    }
         };
+
         match NaiveDateTime::parse_from_str(&s, fmt) {
             Ok(dt) => Ok(dt),
             Err(err) => Err(Error::FromSqlConversionFailure(Box::new(err))),
         }
     }
-            ffi::SQLITE_INTEGER => {
+
-                match NaiveDateTime::from_timestamp_opt(ffi::sqlite3_column_int64(stmt, col), 0) {
+    unsafe fn column_has_valid_sqlite_type(stmt: *mut sqlite3_stmt, col: c_int) -> bool {
-                    Some(dt) => Ok(dt),
+        String::column_has_valid_sqlite_type(stmt, col)
-                    None => {
-                        let err: Box<error::Error + Sync + Send> = "out-of-range number of seconds"
-                                                                       .into();
-                        Err(Error::FromSqlConversionFailure(err))
-                    }
-                }
-            }
-            ffi::SQLITE_FLOAT => {
-                // if column affinity is REAL and an integer/unix timestamp is inserted => unexpected result
-                let mut jd = ffi::sqlite3_column_double(stmt, col);
-                jd -= JULIAN_DAY;
-                jd *= DAY_IN_SECONDS;
-                let ns = jd.fract() * 10f64.powi(9);
-                match NaiveDateTime::from_timestamp_opt(jd as i64, ns as u32) {
-                    Some(dt) => Ok(dt),
-                    None => {
-                        let err: Box<error::Error + Sync + Send> = "out-of-range number of \
-                                                                    seconds and/or invalid \
-                                                                    nanosecond"
-                                                                       .into();
-                        Err(Error::FromSqlConversionFailure(err))
-                    }
-                }
-            }
-            _ => Err(Error::InvalidColumnType),
-        }
     }
 }
 
-/// ISO 8601 date and time with time zone => "YYYY-MM-DD HH:MM:SS.SSS[+-]HH:MM"
+/// Date and time with time zone => RFC3339 timestamp ("YYYY-MM-DDTHH:MM:SS.SSS[+-]HH:MM").
-impl ToSql for DateTime<UTC> {
+impl<Tz: TimeZone> ToSql for DateTime<Tz> where Tz::Offset: ::std::fmt::Display {
     unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
-        let date_str = self.format("%Y-%m-%d %H:%M:%S%.f%:z").to_string();
+        self.to_rfc3339().bind_parameter(stmt, col)
-        date_str.bind_parameter(stmt, col)
     }
 }
 
-/// "YYYY-MM-DD HH:MM:SS.SSS[+-]HH:MM"/"YYYY-MM-DD HH:MM"/"YYYY-MM-DD HH:MM:SS"/"YYYY-MM-DD HH:MM:SS.SSS"/ Julian Day / Unix Time => ISO 8601 date and time with time zone.
+/// RFC3339 ("YYYY-MM-DDTHH:MM:SS.SSS[+-]HH:MM") into DateTime<UTC>.
-/// ("YYYY-MM-DDTHH:MM:SS.SSS[+-]HH:MM"/"YYYY-MM-DDTHH:MM"/"YYYY-MM-DDTHH:MM:SS"/"YYYY-MM-DDTHH:MM:SS.SSS" also supported)
-/// When the timezone is not specified, UTC is used.
 impl FromSql for DateTime<UTC> {
     unsafe fn column_result(stmt: *mut sqlite3_stmt, col: c_int) -> Result<DateTime<UTC>> {
-        match sqlite3_column_type(stmt, col) {
+        let s = try!(String::column_result(stmt, col));
-            ffi::SQLITE_TEXT => {
-                let mut s = try!(String::column_result(stmt, col));
-                if s.len() > 23 {
-                    if s.as_bytes()[10] == b' ' {
-                        s.as_mut_vec()[10] = b'T';
-                    };
-                    // It cannot be used when the offset can be missing.
         match DateTime::parse_from_rfc3339(&s) {
             Ok(dt) => Ok(dt.with_timezone(&UTC)),
-                        Err(err) => Err(Error::FromSqlConversionFailure(Box::new(err))),
+            Err(_) => NaiveDateTime::column_result(stmt, col).map(|dt| UTC.from_utc_datetime(&dt)),
-                    }
-                } else {
-                    NaiveDateTime::column_result(stmt, col).map(|dt| UTC.from_utc_datetime(&dt))
-                }
-            }
-            ffi::SQLITE_INTEGER => {
-                NaiveDateTime::column_result(stmt, col).map(|dt| UTC.from_utc_datetime(&dt))
-            }
-            ffi::SQLITE_FLOAT => {
-                NaiveDateTime::column_result(stmt, col).map(|dt| UTC.from_utc_datetime(&dt))
-            }
-            _ => Err(Error::InvalidColumnType),
-        }
-    }
-}
-
-
-/// ISO 8601 date and time with time zone => "YYYY-MM-DD HH:MM:SS.SSS[+-]HH:MM"
-impl ToSql for DateTime<Local> {
-    unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
-        let date_str = self.format("%Y-%m-%d %H:%M:%S%.f%:z").to_string();
-        date_str.bind_parameter(stmt, col)
         }
     }
 
-/// "YYYY-MM-DD HH:MM:SS.SSS[+-]HH:MM"/"YYYY-MM-DD HH:MM"/"YYYY-MM-DD HH:MM:SS"/"YYYY-MM-DD HH:MM:SS.SSS"/ Julian Day / Unix Time => ISO 8601 date and time with time zone.
+    unsafe fn column_has_valid_sqlite_type(stmt: *mut sqlite3_stmt, col: c_int) -> bool {
-/// ("YYYY-MM-DDTHH:MM:SS.SSS[+-]HH:MM"/"YYYY-MM-DDTHH:MM"/"YYYY-MM-DDTHH:MM:SS"/"YYYY-MM-DDTHH:MM:SS.SSS" also supported)
+        String::column_has_valid_sqlite_type(stmt, col)
-/// When the timezone is not specified, UTC is used.
+    }
+}
+
+/// RFC3339 ("YYYY-MM-DDTHH:MM:SS.SSS[+-]HH:MM") into DateTime<Local>.
 impl FromSql for DateTime<Local> {
     unsafe fn column_result(stmt: *mut sqlite3_stmt, col: c_int) -> Result<DateTime<Local>> {
-        match sqlite3_column_type(stmt, col) {
+        let utc_dt = try!(DateTime::<UTC>::column_result(stmt, col));
-            ffi::SQLITE_TEXT => {
+        Ok(utc_dt.with_timezone(&Local))
-                let mut s = try!(String::column_result(stmt, col));
-                if s.len() > 23 {
-                    if s.as_bytes()[10] == b' ' {
-                        s.as_mut_vec()[10] = b'T';
-                    };
-                    // It cannot be used when the offset can be missing.
-                    match DateTime::parse_from_rfc3339(&s) {
-                        Ok(dt) => Ok(dt.with_timezone(&Local)),
-                        Err(err) => Err(Error::FromSqlConversionFailure(Box::new(err))),
-                    }
-                } else {
-                    NaiveDateTime::column_result(stmt, col).map(|dt| Local.from_utc_datetime(&dt))
-                }
-            }
-            ffi::SQLITE_INTEGER => {
-                NaiveDateTime::column_result(stmt, col).map(|dt| Local.from_utc_datetime(&dt))
-            }
-            ffi::SQLITE_FLOAT => {
-                NaiveDateTime::column_result(stmt, col).map(|dt| Local.from_utc_datetime(&dt))
-            }
-            _ => Err(Error::InvalidColumnType),
-        }
-    }
     }
 
-// struct UnixTime(NaiveDateTime);
+    unsafe fn column_has_valid_sqlite_type(stmt: *mut sqlite3_stmt, col: c_int) -> bool {
-// struct JulianTime(NaiveDateTime)
+        DateTime::<UTC>::column_has_valid_sqlite_type(stmt, col)
+    }
+}
 
 #[cfg(test)]
 mod test {
@@ -264,117 +167,48 @@ mod test {
         let time = NaiveTime::from_hms(23, 56, 4);
         let dt = NaiveDateTime::new(date, time);
 
-        let di = NaiveDateTime::new(date, NaiveTime::from_hms(23, 56, 3));
-        let ds = NaiveDateTime::new(date, NaiveTime::from_hms(23, 56, 5));
-
         db.execute("INSERT INTO foo (t) VALUES (?)", &[&dt]).unwrap();
-        db.execute("UPDATE foo SET f = julianday(t), i = strftime('%s', t)",
-                   &[])
-          .unwrap();
 
         let s: String = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
-        assert_eq!("2016-02-23 23:56:04", s);
+        assert_eq!("2016-02-23T23:56:04", s);
         let v: NaiveDateTime = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
         assert_eq!(dt, v);
-        let f: NaiveDateTime = db.query_row("SELECT f FROM foo", &[], |r| r.get(0)).unwrap();
-        // `2016-02-23T23:56:04` vs `2016-02-23T23:56:03.999992609`
-        assert!(f.ge(&di) && f.le(&ds));
-        let i: NaiveDateTime = db.query_row("SELECT i FROM foo", &[], |r| r.get(0)).unwrap();
-        assert_eq!(dt, i);
 
         db.execute("UPDATE foo set b = datetime(t)", &[]).unwrap(); // "YYYY-MM-DD HH:MM:SS"
         let hms: NaiveDateTime = db.query_row("SELECT b FROM foo", &[], |r| r.get(0)).unwrap();
         assert_eq!(dt, hms);
-
-        db.execute("UPDATE foo set b = strftime('%Y-%m-%dT%H:%M', t)", &[]).unwrap();
-        let hm: NaiveDateTime = db.query_row("SELECT b FROM foo", &[], |r| r.get(0)).unwrap();
-        assert_eq!(NaiveDateTime::new(date, NaiveTime::from_hms(23, 56, 0)), hm);
     }
 
     #[test]
     fn test_date_time_utc() {
         let db = checked_memory_handle();
         let date = NaiveDate::from_ymd(2016, 2, 23);
-        let time = NaiveTime::from_hms(23, 56, 4);
+        let time = NaiveTime::from_hms_milli(23, 56, 4, 789);
         let dt = NaiveDateTime::new(date, time);
         let utc = UTC.from_utc_datetime(&dt);
 
         db.execute("INSERT INTO foo (t) VALUES (?)", &[&utc]).unwrap();
-        db.execute("UPDATE foo SET f = julianday(t), i = strftime('%s', t)",
-                   &[])
-          .unwrap();
 
         let s: String = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
-        assert_eq!("2016-02-23 23:56:04+00:00", s);
+        assert_eq!("2016-02-23T23:56:04.789+00:00", s);
         let v: DateTime<UTC> = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
         assert_eq!(utc, v);
-        let i: DateTime<UTC> = db.query_row("SELECT i FROM foo", &[], |r| r.get(0)).unwrap();
-        assert_eq!(utc, i);
     }
 
     #[test]
     fn test_date_time_local() {
         let db = checked_memory_handle();
         let date = NaiveDate::from_ymd(2016, 2, 23);
-        let time = NaiveTime::from_hms(23, 56, 4);
+        let time = NaiveTime::from_hms_milli(23, 56, 4, 789);
         let dt = NaiveDateTime::new(date, time);
         let local = Local.from_local_datetime(&dt).single().unwrap();
 
         db.execute("INSERT INTO foo (t) VALUES (?)", &[&local]).unwrap();
-        db.execute("UPDATE foo SET f = julianday(t), i = strftime('%s', t)",
-                   &[])
-          .unwrap();
 
-        // let s: String = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
+        let s: String = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
-        // assert_eq!("2016-02-23 23:56:04.000+01:00", s);
+        let offset = Local.offset_from_utc_datetime(&dt);
+        assert_eq!(format!("2016-02-23T23:56:04.789{:}", offset), s);
         let v: DateTime<Local> = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
         assert_eq!(local, v);
-        let i: DateTime<Local> = db.query_row("SELECT i FROM foo", &[], |r| r.get(0)).unwrap();
-        assert_eq!(local, i);
-    }
-
-    #[test]
-    fn test_timezone() {
-        // Worst
-        UTC.datetime_from_str("2016-05-04 17:00:42.862471+08:00",
-                              "%Y-%m-%d %H:%M:%S%.f%:z")
-           .unwrap_err();
-        UTC.datetime_from_str("2016-05-04 17:00:42.862471Z", "%Y-%m-%d %H:%M:%S%.f%:z")
-           .unwrap_err();
-        UTC.datetime_from_str("2016-05-04 17:00:42.862471", "%Y-%m-%d %H:%M:%S%.f%:z").unwrap_err();
-
-        UTC.datetime_from_str("2016-05-04 17:00:42.862471+08:00", "%Y-%m-%d %H:%M:%S%.f%z")
-           .unwrap_err();
-        UTC.datetime_from_str("2016-05-04 17:00:42.862471Z", "%Y-%m-%d %H:%M:%S%.f%z").unwrap_err();
-        UTC.datetime_from_str("2016-05-04 17:00:42.862471", "%Y-%m-%d %H:%M:%S%.f%z").unwrap_err();
-
-        // Better but...
-        DateTime::parse_from_str("2016-05-04 17:00:42.862471+08:00", "%Y-%m-%d %H:%M:%S%.f%z")
-            .unwrap()
-            .with_timezone(&UTC);
-        DateTime::parse_from_str("2016-05-04 17:00:42.862471Z", "%Y-%m-%d %H:%M:%S%.f%z")
-            .unwrap_err(); // Invalid
-        DateTime::parse_from_str("2016-05-04 17:00:42.862471", "%Y-%m-%d %H:%M:%S%.f%z")
-            .unwrap_err(); // TooShort
-
-        DateTime::parse_from_str("2016-05-04 17:00:42.862471+08:00",
-                                 "%Y-%m-%d %H:%M:%S%.f%:z")
-            .unwrap()
-            .with_timezone(&UTC);
-        DateTime::parse_from_str("2016-05-04 17:00:42.862471Z", "%Y-%m-%d %H:%M:%S%.f%:z")
-            .unwrap_err(); // Invalid
-        DateTime::parse_from_str("2016-05-04 17:00:42.862471", "%Y-%m-%d %H:%M:%S%.f%:z")
-            .unwrap_err(); // TooShort
-
-        // Best but in SQLite, the timezone indicator is optional
-        DateTime::parse_from_rfc3339("2016-05-04T17:00:42.862471+08:00")
-            .unwrap()
-            .with_timezone(&UTC);
-        DateTime::parse_from_rfc3339("2016-05-04T17:00:42.862471Z").unwrap().with_timezone(&UTC);
-        DateTime::parse_from_rfc3339("2016-05-04T17:00:42.862471").unwrap_err(); // TooShort
-
-        "2016-05-04T17:00:42.862471+08:00".parse::<DateTime<UTC>>().unwrap();
-        "2016-05-04T17:00:42.862471Z".parse::<DateTime<UTC>>().unwrap();
-        "2016-05-04T17:00:42.862471".parse::<DateTime<UTC>>().unwrap_err(); // TooShort
     }
 }