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use super::{Environment, Result, GetDiagRec, Version3};
use {ffi, Raii, Handle, Return, as_out_buffer, as_buffer_length};
use ffi::{SQLDataSources, SQLDrivers, SQLRETURN, SQLHENV, SQLSMALLINT, SQLCHAR, FetchOrientation};
use std::collections::HashMap;
use std::str::from_utf8;
use std::cmp::max;
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct DataSourceInfo {
pub server_name: String,
pub driver: String,
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct DriverInfo {
pub description: String,
pub attributes: HashMap<String, String>,
}
type SqlInfoMethod = fn(&Raii<ffi::Env>, ffi::FetchOrientation, &mut [u8], &mut [u8])
-> Return<Option<(i16, i16)>>;
impl Environment<Version3> {
fn parse_attributes(attributes: &str) -> HashMap<String, String> {
attributes.split('\0')
.take_while(|kv_str| *kv_str != String::new())
.map(|kv_str| {
let mut iter = kv_str.split('=');
let key = iter.next().unwrap();
let value = iter.next().unwrap();
(key.to_string(), value.to_string())
})
.collect()
}
pub fn drivers(&self) -> Result<Vec<DriverInfo>> {
let (max_desc, max_attr, num_drivers) =
self.alloc_info(Raii::drivers, ffi::SQL_FETCH_FIRST)?;
let mut driver_list = Vec::with_capacity(num_drivers);
let mut description_buffer = vec![0; (max_desc + 1) as usize];
let mut attribute_buffer = vec![0; (max_attr + 1) as usize];
while let Some((desc, attr)) =
self.get_info(Raii::drivers,
ffi::SQL_FETCH_NEXT,
&mut description_buffer,
&mut attribute_buffer)? {
driver_list.push(DriverInfo {
description: desc.to_owned(),
attributes: Self::parse_attributes(attr),
})
}
Ok(driver_list)
}
pub fn data_sources(&self) -> Result<Vec<DataSourceInfo>> {
self.data_sources_impl(ffi::SQL_FETCH_FIRST)
}
pub fn system_data_sources(&self) -> Result<Vec<DataSourceInfo>> {
self.data_sources_impl(ffi::SQL_FETCH_FIRST_SYSTEM)
}
pub fn user_data_sources(&self) -> Result<Vec<DataSourceInfo>> {
self.data_sources_impl(ffi::SQL_FETCH_FIRST_USER)
}
fn data_sources_impl(&self, direction: ffi::FetchOrientation) -> Result<Vec<DataSourceInfo>> {
let (max_name, max_desc, num_sources) = self.alloc_info(Raii::data_sources, direction)?;
let mut source_list = Vec::with_capacity(num_sources);
let mut name_buffer: Vec<_> = (0..(max_name + 1)).map(|_| 0u8).collect();
let mut description_buffer: Vec<_> = (0..(max_desc + 1)).map(|_| 0u8).collect();
if let Some((name, desc)) =
self.get_info(Raii::data_sources,
direction,
&mut name_buffer,
&mut description_buffer)? {
source_list.push(DataSourceInfo {
server_name: name.to_owned(),
driver: desc.to_owned(),
})
} else {
return Ok(source_list);
}
while let Some((name, desc)) =
self.get_info(Raii::data_sources,
ffi::SQL_FETCH_NEXT,
&mut name_buffer,
&mut description_buffer)? {
source_list.push(DataSourceInfo {
server_name: name.to_owned(),
driver: desc.to_owned(),
})
}
Ok(source_list)
}
fn get_info<'a, 'b>(&self,
f: SqlInfoMethod,
direction: ffi::FetchOrientation,
buf1: &'a mut [u8],
buf2: &'b mut [u8])
-> Result<Option<(&'a str, &'b str)>> {
let result = f(&self.raii, direction, buf1, buf2);
match result.into_result(self)? {
Some((len1, len2)) => {
Ok(Some((from_utf8(&buf1[0..(len1 as usize)]).unwrap(),
from_utf8(&buf2[0..(len2 as usize)]).unwrap())))
}
None => Ok(None),
}
}
fn alloc_info(&self,
f: SqlInfoMethod,
direction: ffi::FetchOrientation)
-> Result<(ffi::SQLSMALLINT, ffi::SQLSMALLINT, usize)> {
let mut string_buf1 = [0; 0];
let mut string_buf2 = [0; 0];
let mut max1 = 0;
let mut max2 = 0;
let mut count = 0;
let mut result = f(&self.raii, direction, &mut string_buf1, &mut string_buf2);
loop {
match result {
Return::Success(Some((buf1_length_out, buf2_length_out))) |
Return::SuccessWithInfo(Some((buf1_length_out, buf2_length_out))) => {
count += 1;
max1 = max(max1, buf1_length_out);
max2 = max(max2, buf2_length_out);
}
Return::Success(None) |
Return::SuccessWithInfo(None) => break,
Return::Error => {
let diag = self.get_diag_rec(1).unwrap();
error!("{}", diag);
return Err(diag);
}
}
result = f(&self.raii,
ffi::SQL_FETCH_NEXT,
&mut string_buf1,
&mut string_buf2)
}
Ok((max1, max2, count))
}
}
impl Raii<ffi::Env> {
fn data_sources(&self,
direction: FetchOrientation,
server_name: &mut [u8],
description: &mut [u8])
-> Return<Option<(i16, i16)>> {
self.impl_data_sources(SQLDataSources, direction, server_name, description)
}
fn drivers(&self,
direction: FetchOrientation,
description: &mut [u8],
attributes: &mut [u8])
-> Return<Option<(i16, i16)>> {
self.impl_data_sources(SQLDrivers, direction, description, attributes)
}
fn impl_data_sources(&self,
c_function: SqlInfoFunction,
direction: FetchOrientation,
server_name: &mut [u8],
description: &mut [u8])
-> Return<Option<(i16, i16)>> {
let (mut server_name_length, mut description_length): (i16, i16) = (0, 0);
match unsafe {
c_function(self.handle(),
direction,
as_out_buffer(server_name),
as_buffer_length(server_name.len()),
&mut server_name_length as *mut i16,
as_out_buffer(description),
as_buffer_length(description.len()),
&mut description_length as *mut i16)
} {
SQLRETURN::SQL_SUCCESS => {
Return::Success(Some((server_name_length, description_length)))
}
SQLRETURN::SQL_SUCCESS_WITH_INFO => {
Return::SuccessWithInfo(Some((server_name_length, description_length)))
}
SQLRETURN::SQL_ERROR => Return::Error,
SQLRETURN::SQL_NO_DATA => Return::Success(None),
_ => panic!("SQL Data Sources returned unexpected result"),
}
}
}
type SqlInfoFunction = unsafe extern "C" fn(SQLHENV,
FetchOrientation,
*mut SQLCHAR,
SQLSMALLINT,
*mut SQLSMALLINT,
*mut SQLCHAR,
SQLSMALLINT,
*mut SQLSMALLINT)
-> SQLRETURN;
#[cfg(test)]
mod test {
use super::*;
#[test]
fn parse_attributes() {
let buffer = "APILevel=2\0ConnectFunctions=YYY\0CPTimeout=60\0DriverODBCVer=03.\
50\0FileUsage=0\0SQLLevel=1\0UsageCount=1\0\0";
let attributes = Environment::parse_attributes(buffer);
assert_eq!(attributes["APILevel"], "2");
assert_eq!(attributes["ConnectFunctions"], "YYY");
assert_eq!(attributes["CPTimeout"], "60");
assert_eq!(attributes["DriverODBCVer"], "03.50");
assert_eq!(attributes["FileUsage"], "0");
assert_eq!(attributes["SQLLevel"], "1");
assert_eq!(attributes["UsageCount"], "1");
}
}