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annotate rust/pyo3-sharedref/tests/test_sharedref.rs @ 52608:d85514a88706

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rust-pyo3-sharedref: reworked constructors We had previously duplicated the `new` associated function on `PySharedRef` with a method on `PySharedRefCell`: in `rust-cpython`, the former was hidden by the accessor defined by the `py_class!` macro, which we did not port yet. On `PySharedRefCell` itself, replacing the `new` associated function by the `From` trait carries all the needed semantics, and has the advantage of less repetititons of the type name, which will help with further refactorings and renamings.
author Georges Racinet <georges.racinet@cloudcrane.io>
date Sun, 15 Dec 2024 14:42:53 +0100
parents a7d2529ed6dd
children d1e304025b90
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1 use pyo3::prelude::*;
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2 use pyo3_sharedref::*;
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3
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4 #[pyclass]
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5 struct Owner {
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6 string: PySharedRefCell<String>,
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7 }
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8
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9 #[pymethods]
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10 impl Owner {
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11 #[new]
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12 fn new(s: String) -> Self {
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13 Self { string: s.into() }
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14 }
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15 }
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16
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17 fn with_setup(
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18 test: impl FnOnce(Python<'_>, &Bound<'_, Owner>) -> PyResult<()>,
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19 ) -> PyResult<()> {
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20 pyo3::prepare_freethreaded_python();
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21 Python::with_gil(|py| {
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22 let owner = Bound::new(py, Owner::new("new".to_owned()))?;
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23 test(py, &owner)
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24 })
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25 }
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26
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27 /// "leak" in the sense of `UnsafePyLeaked` the `string` data field,
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28 /// taking care of all the boilerplate
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29 fn leak_string(owner: &Bound<'_, Owner>) -> UnsafePyLeaked<&'static String> {
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30 let cell = &owner.borrow().string;
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31 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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32 shared_ref.leak_immutable()
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33 }
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34
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35 fn try_leak_string(
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36 owner: &Bound<'_, Owner>,
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37 ) -> Result<UnsafePyLeaked<&'static String>, TryLeakError> {
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38 let cell = &owner.borrow().string;
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39 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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40 shared_ref.try_leak_immutable()
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41 }
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42
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43 /// Mutate the `string` field of `owner` as would be done from Python code
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44 ///
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45 /// This is to simulate normal mutation of the owner object from
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46 /// the Python interpreter. This could be replaced by methods of [`Owner`]
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47 /// (wih closure replaced by a small fixed operations)
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48 /// and perhaps will, once we are done converting the original tests
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49 /// from rust-cpython
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50 fn mutate_string<'py>(
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51 owner: &'py Bound<'py, Owner>,
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52 f: impl FnOnce(&mut String),
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53 ) -> () {
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54 let cell = &owner.borrow_mut().string;
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55 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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56 f(&mut shared_ref.borrow_mut());
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57 }
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58
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59 #[test]
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60 fn test_leaked_borrow() -> PyResult<()> {
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61 with_setup(|py, owner| {
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62 let leaked = leak_string(owner);
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63 let leaked_ref = unsafe { leaked.try_borrow(py) }.unwrap();
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64 assert_eq!(*leaked_ref, "new");
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65 Ok(())
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66 })
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67 }
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68
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69 #[test]
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70 fn test_leaked_borrow_mut() -> PyResult<()> {
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71 with_setup(|py, owner| {
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72 let leaked = leak_string(owner);
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73 let mut leaked_iter = unsafe { leaked.map(py, |s| s.chars()) };
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74 let mut leaked_ref =
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75 unsafe { leaked_iter.try_borrow_mut(py) }.unwrap();
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76 assert_eq!(leaked_ref.next(), Some('n'));
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77 assert_eq!(leaked_ref.next(), Some('e'));
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78 assert_eq!(leaked_ref.next(), Some('w'));
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79 assert_eq!(leaked_ref.next(), None);
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80 Ok(())
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81 })
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82 }
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83
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84 #[test]
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85 fn test_leaked_borrow_after_mut() -> PyResult<()> {
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86 with_setup(|py, owner| {
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87 let leaked = leak_string(owner);
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88 mutate_string(owner, String::clear);
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89 assert!(unsafe { leaked.try_borrow(py) }.is_err());
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90 Ok(())
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91 })
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92 }
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93
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94 #[test]
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95 fn test_leaked_borrow_mut_after_mut() -> PyResult<()> {
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96 with_setup(|py, owner| {
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97 let leaked = leak_string(owner);
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98 let mut leaked_iter = unsafe { leaked.map(py, |s| s.chars()) };
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99
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100 mutate_string(owner, String::clear);
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101 assert!(unsafe { leaked_iter.try_borrow_mut(py) }.is_err());
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102 Ok(())
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103 })
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104 }
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105
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106 #[test]
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107 #[should_panic(expected = "map() over invalidated leaked reference")]
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108 fn test_leaked_map_after_mut() {
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109 with_setup(|py, owner| {
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110 let leaked = leak_string(owner);
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111 mutate_string(owner, String::clear);
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112 let _leaked_iter = unsafe { leaked.map(py, |s| s.chars()) };
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113 Ok(())
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114 })
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115 .expect("should already have panicked")
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116 }
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117
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118 /// run `try_borrow_mut` on the `string` field and assert it is not an error
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119 ///
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120 /// Simply returning the `Result` is not possible, because that is
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121 /// returning a reference to data owned by the function
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122 fn assert_try_borrow_string_mut_ok(owner: &Bound<'_, Owner>) {
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123 let cell = &owner.borrow().string;
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124 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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125 assert!(shared_ref.try_borrow_mut().is_ok());
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126 }
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127
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128 fn assert_try_borrow_string_mut_err(owner: &Bound<'_, Owner>) {
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129 let cell = &owner.borrow().string;
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130 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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131 assert!(shared_ref.try_borrow_mut().is_err());
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132 }
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133
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134 fn assert_try_borrow_string_err(owner: &Bound<'_, Owner>) {
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135 let cell = &owner.borrow().string;
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136 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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137 assert!(shared_ref.try_borrow().is_err());
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138 }
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139
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140 #[test]
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141 fn test_try_borrow_mut_while_leaked_ref() -> PyResult<()> {
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142 with_setup(|py, owner| {
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143 assert_try_borrow_string_mut_ok(owner);
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144 let leaked = leak_string(owner);
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145 {
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146 let _leaked_ref = unsafe { leaked.try_borrow(py) }.unwrap();
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147 assert_try_borrow_string_mut_err(owner);
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148 {
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149 let _leaked_ref2 = unsafe { leaked.try_borrow(py) }.unwrap();
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150 assert_try_borrow_string_mut_err(owner);
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151 }
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152 assert_try_borrow_string_mut_err(owner);
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153 }
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154 assert_try_borrow_string_mut_ok(owner);
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155 Ok(())
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156 })
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157 }
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158
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159 #[test]
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160 fn test_try_borrow_mut_while_leaked_ref_mut() -> PyResult<()> {
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161 with_setup(|py, owner| {
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162 assert_try_borrow_string_mut_ok(owner);
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163 let leaked = leak_string(owner);
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164 let mut leaked_iter = unsafe { leaked.map(py, |s| s.chars()) };
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165 {
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166 let _leaked_ref =
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167 unsafe { leaked_iter.try_borrow_mut(py) }.unwrap();
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168 assert_try_borrow_string_mut_err(owner);
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169 }
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170 assert_try_borrow_string_mut_ok(owner);
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171 Ok(())
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172 })
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173 }
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174
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175 #[test]
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176 fn test_try_leak_while_borrow_mut() -> PyResult<()> {
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177 with_setup(|_py, owner| {
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178 let cell = &owner.borrow().string;
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179 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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180 let _mut_ref = shared_ref.borrow_mut();
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181
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182 assert!(try_leak_string(owner).is_err());
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183 Ok(())
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184 })
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185 }
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186
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187 #[test]
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188 #[should_panic(expected = "already mutably borrowed")]
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189 fn test_leak_while_borrow_mut() {
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190 with_setup(|_py, owner| {
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191 let cell = &owner.borrow().string;
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192 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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193 let _mut_ref = shared_ref.borrow_mut();
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194
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195 leak_string(owner);
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196 Ok(())
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197 })
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198 .expect("should already have panicked")
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199 }
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200
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201 #[test]
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202 fn test_try_borrow_mut_while_borrow() -> PyResult<()> {
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203 with_setup(|_py, owner| {
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204 let cell = &owner.borrow().string;
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205 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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206 let _ref = shared_ref.borrow();
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207
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208 assert_try_borrow_string_mut_err(owner);
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209 Ok(())
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210 })
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211 }
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212
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213 #[test]
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214 #[should_panic(expected = "already borrowed")]
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215 fn test_borrow_mut_while_borrow() {
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216 with_setup(|_py, owner| {
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217 let cell = &owner.borrow().string;
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218 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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219 let _ref = shared_ref.borrow();
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220
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221 let shared_ref2 = unsafe { cell.borrow_with_owner(owner) };
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222 let _mut_ref = shared_ref2.borrow_mut();
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223 Ok(())
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224 })
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225 .expect("should already have panicked")
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226 }
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227
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228 #[test]
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229 fn test_try_borrow_while_borrow_mut() -> PyResult<()> {
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230 with_setup(|_py, owner| {
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231 let cell = &owner.borrow().string;
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232 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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233 let _mut_ref = shared_ref.borrow_mut();
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234
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235 assert_try_borrow_string_err(owner);
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236 Ok(())
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237 })
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238 }
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239
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240 #[test]
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241 #[should_panic(expected = "already mutably borrowed")]
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242 fn test_borrow_while_borrow_mut() {
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243 with_setup(|_py, owner| {
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244 let cell = &owner.borrow().string;
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245 let shared_ref = unsafe { cell.borrow_with_owner(owner) };
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246 let _mut_ref = shared_ref.borrow_mut();
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247
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248 let shared_ref2 = unsafe { cell.borrow_with_owner(owner) };
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249 let _ref = shared_ref2.borrow();
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250 Ok(())
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251 })
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252 .expect("should already have panicked")
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253 }