[rust connector] support subscribe

tests/examples/rust/README.md

@@ -10,7 +10,11 @@ curl https://sh.rustup.rs -sSf | sh
 
 ## Run with Sample
 
-Build and run:
+Build and run basic sample:
 ```
 cargo run --example demo
 ```
+Build and run subscribe sample:
+```
+cargo run --example subscribe
+```

tests/examples/rust/examples/demo.rs

@@ -2,7 +2,8 @@ use std::process;
 use tdengine::Tdengine;
 
 fn main() {
-    let tde = Tdengine::new("127.0.0.1", "root", "taosdata", "", 0).unwrap_or_else(|err| {
+    let tde = Tdengine::new("127.0.0.1", "root", "taosdata", "demo", 0)
+                .unwrap_or_else(|err| {
         eprintln!("Can't create Tdengine: {}", err);
         process::exit(1)
     });

tests/examples/rust/examples/subscribe.rs

+use std::process;
+use tdengine::Subscriber;
+
+fn main() {
+    let subscriber = Subscriber::new("127.0.0.1", "root", "taosdata", "demo", "m1", 0, 1000)
+                        .unwrap_or_else(|err| {
+        eprintln!("Can't create Subscriber: {}", err);
+        process::exit(1)
+    });
+
+    loop {
+        let row = subscriber.consume().unwrap_or_else(|err| {
+            eprintln!("consume exit: {}", err);
+            process::exit(1)
+        });
+
+        subscriber.print_row(&row);
+    }
+}

tests/examples/rust/src/lib.rs

 #![allow(unused)]
 #![allow(non_camel_case_types)]
 
-use std::os::raw::c_void;
-use std::os::raw::c_char;
-use std::os::raw::c_int;
-use std::ffi::CString;
-use std::ffi::CStr;
+pub mod subscriber;
+pub use subscriber::*;
 
-mod bindings;
-use bindings::*;
+pub mod tdengine;
+pub use tdengine::*;
 
-pub struct Tdengine {
-    conn: *mut c_void,
-}
-
-/// - **TODO**:  doc
-impl Tdengine {
-
-    //! - **TODO**: implement default param.
-    //! 
-    //! > refer to https://stackoverflow.com/questions/24047686/default-function-arguments-in-rust
-    pub fn new(ip: &str, username: &str, passwd: &str, db: &str, port: i32) -> Result<Tdengine, &'static str> {
-        unsafe {
-            taos_init();
-            let mut conn = taos_connect(str_into_raw(ip),
-                                        str_into_raw(username),
-                                        str_into_raw(passwd),
-                                        str_into_raw(db),
-                                        port as c_int);
-            if conn.is_null() {
-                Err("connect error")
-            } else {
-                println!("connected to {}:{} user:{}, db:{}", ip, port, username, db);
-                Ok(Tdengine {conn})
-            }
-        }
-    }
-
-    // - **TODO**: check error code
-    pub fn query(self: &Tdengine, s: &str) {
-        unsafe {
-            if taos_query(self.conn, str_into_raw(s)) == 0 {
-                println!("query '{}' ok", s);
-            } else {
-                println!("query '{}' error: {}", s, raw_into_str(taos_errstr(self.conn)));
-            }
-        }
-    }
-}
-
-impl Drop for Tdengine {
-    fn drop(&mut self) {
-        unsafe {taos_close(self.conn);}
-    }
-}
-
-fn str_into_raw(s: &str) -> *mut c_char {
-    if s.is_empty() {
-        0 as *mut c_char
-    } else {
-        CString::new(s).unwrap().into_raw()
-    }
-}
-
-fn raw_into_str<'a>(raw: *mut c_char) -> &'static str {
-    unsafe {CStr::from_ptr(raw).to_str().unwrap()}
-}
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
-    }
-}
\ No newline at end of file
+pub mod utils;
\ No newline at end of file

tests/examples/rust/src/subscriber.rs

+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+#[path = "utils.rs"]
+mod utils;
+use utils::*;
+use utils::bindings::*;
+
+use std::os::raw::{c_void, c_char, c_int, c_long};
+
+pub struct Subscriber {
+    tsub: *mut c_void,
+    fields: *mut taosField,
+    fcount: c_int,
+}
+
+impl Subscriber {
+    pub fn new(host: &str,
+               username: &str,
+               passwd: &str,
+               db: &str,
+               table:&str,
+               time: i64,
+               mseconds: i32
+              ) -> Result<Subscriber, &'static str> {
+        unsafe {
+            let mut tsub = taos_subscribe(str_into_raw(host),
+                                          str_into_raw(username),
+                                          str_into_raw(passwd),
+                                          str_into_raw(db),
+                                          str_into_raw(table),
+                                          time as c_long,
+                                          mseconds as c_int);
+            if tsub.is_null() {
+                return Err("subscribe error")
+            }
+            println!("subscribed to {} user:{}, db:{}, tb:{}, time:{}, mseconds:{}",
+                        host, username, db, table, time, mseconds);
+
+            let mut fields = taos_fetch_subfields(tsub);
+            if fields.is_null() {
+                taos_unsubscribe(tsub);
+                return Err("fetch subfields error")
+            }
+
+            let fcount = taos_subfields_count(tsub);
+            if fcount == 0 {
+                taos_unsubscribe(tsub);
+                return Err("subfields count is 0")
+            }
+
+            Ok(Subscriber{tsub, fields, fcount})
+        }
+    }
+
+    pub fn consume(self: &Subscriber) -> Result<Row, &'static str> {
+        unsafe {
+            let taosRow = taos_consume(self.tsub);
+            if taosRow.is_null() {
+                return Err("consume error")
+            }
+            let taosRow= std::slice::from_raw_parts(taosRow, self.fcount as usize);
+            let row = raw_into_row(self.fields, self.fcount, &taosRow);
+            Ok(row)
+        }
+    }
+
+    pub fn print_row(self: &Subscriber, row: &Row) {
+        println!("{}", format_row(row));
+    }
+}
+
+impl Drop for Subscriber {
+    fn drop(&mut self) {
+        unsafe {taos_unsubscribe(self.tsub);}
+    }
+}
\ No newline at end of file

tests/examples/rust/src/tdengine.rs

+#[path = "bindings.rs"]
+mod bindings;
+use bindings::*;
+
+#[path = "utils.rs"]
+mod utils;
+use utils::*;
+
+use std::os::raw::c_void;
+use std::os::raw::c_char;
+use std::os::raw::c_int;
+use std::os::raw::c_long;
+
+pub struct Tdengine {
+    conn: *mut c_void,
+}
+
+/// - **TODO**:  doc
+impl Tdengine {
+
+    //! - **TODO**: implement default param.
+    //! 
+    //! > refer to https://stackoverflow.com/questions/24047686/default-function-arguments-in-rust
+    pub fn new(ip: &str, username: &str, passwd: &str, db: &str, port: i32) -> Result<Tdengine, &'static str> {
+        unsafe {
+            taos_init();
+            let mut conn = taos_connect(str_into_raw(ip),
+                                        str_into_raw(username),
+                                        str_into_raw(passwd),
+                                        str_into_raw(db),
+                                        port as c_int);
+            if conn.is_null() {
+                Err("connect error")
+            } else {
+                println!("connected to {}:{} user:{}, db:{}", ip, port, username, db);
+                Ok(Tdengine {conn})
+            }
+        }
+    }
+
+    // - **TODO**: check error code
+    pub fn query(self: &Tdengine, s: &str) {
+        unsafe {
+            if taos_query(self.conn, str_into_raw(s)) == 0 {
+                println!("query '{}' ok", s);
+            } else {
+                println!("query '{}' error: {}", s, raw_into_str(taos_errstr(self.conn)));
+            }
+        }
+    }
+}
+
+impl Drop for Tdengine {
+    fn drop(&mut self) {
+        unsafe {taos_close(self.conn);}
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}
\ No newline at end of file

tests/examples/rust/src/utils.rs

+#[path = "bindings.rs"]
+pub mod bindings;
+use bindings::*;
+
+use std::fmt;
+use std::fmt::Display;
+use std::os::raw::{c_void, c_char, c_int};
+use std::ffi::{CString, CStr};
+
+// #[derive(Debug)]
+pub enum Field {
+    tinyInt(i8),
+    smallInt(i16),
+    normalInt(i32),
+    bigInt(i64),
+    float(f32),
+    double(f64),
+    binary(String),
+    timeStamp(i64),
+    boolType(bool),
+}
+
+
+impl fmt::Display for Field {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match &*self {
+            Field::tinyInt(v) => write!(f, "{}", v),
+            Field::smallInt(v) => write!(f, "{}", v),
+            Field::normalInt(v) => write!(f, "{}", v),
+            Field::bigInt(v) => write!(f, "{}", v),
+            Field::float(v) => write!(f, "{}", v),
+            Field::double(v) => write!(f, "{}", v),
+            Field::binary(v) => write!(f, "{}", v),
+            Field::tinyInt(v) => write!(f, "{}", v),
+            Field::timeStamp(v) => write!(f, "{}", v),
+            Field::boolType(v) => write!(f, "{}", v),
+        }
+    }
+}
+
+// pub type Fields = Vec<Field>;
+pub type Row = Vec<Field>;
+
+pub fn format_row(row: &Row) -> String {
+    let mut s = String::new();
+    for field in row {
+        s.push_str(format!("{} ", field).as_str());
+        // println!("{}", field);
+    }
+    s
+}
+
+pub fn str_into_raw(s: &str) -> *mut c_char {
+    if s.is_empty() {
+        0 as *mut c_char
+    } else {
+        CString::new(s).unwrap().into_raw()
+    }
+}
+
+pub fn raw_into_str<'a>(raw: *mut c_char) -> &'static str {
+    unsafe {CStr::from_ptr(raw).to_str().unwrap()}
+}
+
+
+pub fn raw_into_field(raw: *mut TAOS_FIELD, fcount: c_int) -> Vec<taosField> {
+    let mut fields: Vec<taosField> = Vec::new();
+
+    for i in 0..fcount as isize {
+        fields.push(
+            taosField {
+                name: unsafe {(*raw.offset(i as isize))}.name,
+                bytes: unsafe {(*raw.offset(i as isize))}.bytes,
+                type_: unsafe {(*raw.offset(i as isize))}.type_,
+            }
+        );
+    }
+
+    /// TODO: error[E0382]: use of moved value: `fields`
+    // for field in &fields {
+    //     println!("type: {}, bytes: {}", field.type_, field.bytes);
+    // }
+
+    fields
+}
+
+   pub fn raw_into_row(fields: *mut TAOS_FIELD, fcount: c_int, raw_row: &[*mut c_void]) -> Row {
+        let mut row: Row= Vec::new();
+        let fields = raw_into_field(fields, fcount);
+
+        for (i, field) in fields.iter().enumerate() {
+            // println!("index: {}, type: {}, bytes: {}", i, field.type_, field.bytes);
+            unsafe {
+                match field.type_ as u32 {
+                    TSDB_DATA_TYPE_TINYINT => {
+                        row.push(Field::tinyInt(*(raw_row[i] as *mut i8)));
+                    }
+                    TSDB_DATA_TYPE_SMALLINT => {
+                        row.push(Field::smallInt(*(raw_row[i] as *mut i16)));
+                    }
+                    TSDB_DATA_TYPE_INT => {
+                        row.push(Field::normalInt(*(raw_row[i] as *mut i32)));
+                    }
+                    TSDB_DATA_TYPE_BIGINT => {
+                        row.push(Field::bigInt(*(raw_row[i] as *mut i64)));
+                    }
+                    TSDB_DATA_TYPE_FLOAT => {
+                        row.push(Field::float(*(raw_row[i] as *mut f32)));
+                    }
+                    TSDB_DATA_TYPE_DOUBLE => {
+                        row.push(Field::double(*(raw_row[i] as *mut f64)));
+                    }
+                    TSDB_DATA_TYPE_BINARY | TSDB_DATA_TYPE_NCHAR => {
+                        // row.push(Field::binary(*(raw_row[i] as *mut f64)));
+                    }
+                    TSDB_DATA_TYPE_TIMESTAMP => {
+                        row.push(Field::timeStamp(*(raw_row[i] as *mut i64)));
+                    }
+                    TSDB_DATA_TYPE_BOOL => {
+                        // row.push(Field::boolType(*(raw_row[i] as *mut i8) as bool));
+                    }
+                    _ => println!(""),
+                }
+            }
+        }
+        row
+    }
\ No newline at end of file