Error handling examples
This commit is contained in:
Timothy Warren
parent
124e78131a
commit
17f7e4dfcf
2
.gitignore
vendored
2
.gitignore
vendored
@ -42,3 +42,5 @@ Cargo.lock
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**/*.rs.bk
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# End of https://www.gitignore.io/api/osx,rust
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errors/hello.txt
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1
.idea/misc.xml
generated
1
.idea/misc.xml
generated
@ -15,6 +15,7 @@
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<cargoProject FILE="$PROJECT_DIR$/rectangles/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/enums/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/modules/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/errors/Cargo.toml" />
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</component>
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<component name="ComposerJsonPluginSettings">
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<unboundedVersionInspectionSettings>
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5
.idea/rust.iml
generated
5
.idea/rust.iml
generated
@ -59,9 +59,14 @@
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<sourceFolder url="file://$MODULE_DIR$/modules/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/modules/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/modules/benches" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/errors/src" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/errors/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/errors/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/errors/benches" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/branches/target" />
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<excludeFolder url="file://$MODULE_DIR$/ctof/target" />
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<excludeFolder url="file://$MODULE_DIR$/enums/target" />
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<excludeFolder url="file://$MODULE_DIR$/errors/target" />
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<excludeFolder url="file://$MODULE_DIR$/ftoc/target" />
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<excludeFolder url="file://$MODULE_DIR$/functions/target" />
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<excludeFolder url="file://$MODULE_DIR$/guessing_game/target" />
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69
.idea/workspace.xml
generated
69
.idea/workspace.xml
generated
@ -3,6 +3,9 @@
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<component name="ChangeListManager">
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<list default="true" id="c8f42924-1cd2-4b1c-bcff-602a3368bb16" name="Default Changelist" comment="">
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<change beforePath="$PROJECT_DIR$/.gitignore" beforeDir="false" afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/.idea/rust.iml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/rust.iml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
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</list>
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<option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
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<option name="SHOW_DIALOG" value="false" />
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@ -13,10 +16,14 @@
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<component name="FileEditorManager">
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<leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
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<file pinned="false" current-in-tab="false">
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<entry file="file://$PROJECT_DIR$/guessing_game/.gitignore">
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<entry file="file://$PROJECT_DIR$/errors/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="32">
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<caret line="2" column="5" selection-start-line="2" selection-start-column="5" selection-end-line="2" selection-end-column="5" />
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<state relative-caret-position="1024">
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<caret line="64" column="1" lean-forward="true" selection-start-line="64" selection-start-column="1" selection-end-line="64" selection-end-column="1" />
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<folding>
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<element signature="e#285#286#0" expanded="true" />
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</folding>
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</state>
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</provider>
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</entry>
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@ -24,8 +31,8 @@
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<file pinned="false" current-in-tab="true">
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<entry file="file://$PROJECT_DIR$/.gitignore">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="544">
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<state relative-caret-position="720">
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</state>
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</provider>
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</entry>
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@ -70,6 +77,7 @@
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<option value="$PROJECT_DIR$/modules/src/main.rs" />
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<option value="$PROJECT_DIR$/modules/src/sound/instrument.rs" />
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<option value="$PROJECT_DIR$/guessing_game/.gitignore" />
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<option value="$PROJECT_DIR$/errors/src/main.rs" />
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<option value="$PROJECT_DIR$/.gitignore" />
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</list>
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</option>
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@ -101,6 +109,11 @@
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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</path>
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="errors" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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</expand>
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<select />
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</subPane>
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@ -132,7 +145,7 @@
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</component>
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<component name="PropertiesComponent">
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<property name="JavaScriptWeakerCompletionTypeGuess" value="true" />
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<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1548879647202" />
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<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1548883606455" />
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<property name="javascript.nodejs.core.library.configured.version" value="7.1.0" />
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<property name="js.eslint.eslintPackage" value="$USER_HOME$/.yarn-config/global/node_modules/.bin/eslint" />
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<property name="js.eslint.nodeInterpreter" value="project" />
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@ -160,7 +173,7 @@
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</list>
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</option>
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</component>
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<component name="RunManager" selected="Cargo Command.Run modules">
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<component name="RunManager" selected="Cargo Command.Run errors">
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<configuration name="<template>" type="TestNG" default="true" selected="false">
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<option name="MAIN_CLASS_NAME" />
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<option name="VM_PARAMETERS" value="-ea" />
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@ -189,6 +202,16 @@
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run errors" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package errors --bin errors" />
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<option name="allFeatures" value="false" />
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<option name="nocapture" value="false" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/errors" />
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run modules" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package modules --bin modules" />
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@ -209,16 +232,6 @@
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run slices" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package slices --bin slices" />
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<option name="allFeatures" value="false" />
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<option name="nocapture" value="false" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/slices" />
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run structs" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package structs --bin structs" />
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@ -238,11 +251,11 @@
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</configuration>
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<recent_temporary>
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<list>
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<item itemvalue="Cargo Command.Run errors" />
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<item itemvalue="Cargo Command.Run modules" />
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<item itemvalue="Cargo Command.Run enums" />
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<item itemvalue="Cargo Command.Run rectangles" />
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<item itemvalue="Cargo Command.Run structs" />
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<item itemvalue="Cargo Command.Run slices" />
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</list>
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@ -258,7 +271,7 @@
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<window_info id="Favorites" order="5" side_tool="true" />
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<window_info id="Cargo" order="6" sideWeight="0.49791494" weight="0.3286119" />
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<window_info anchor="bottom" id="Message" order="0" />
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<window_info anchor="bottom" id="Find" order="1" />
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<window_info anchor="bottom" id="Find" order="1" weight="0.32979318" />
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<window_info anchor="bottom" id="Run" order="2" visible="true" weight="0.32979318" />
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<window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
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<window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
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@ -438,10 +451,24 @@
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</state>
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</provider>
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</entry>
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<entry file="file://$PROJECT_DIR$/errors/hello.txt">
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<provider selected="true" editor-type-id="text-editor" />
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</entry>
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<entry file="file://$PROJECT_DIR$/errors/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="1024">
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<caret line="64" column="1" lean-forward="true" selection-start-line="64" selection-start-column="1" selection-end-line="64" selection-end-column="1" />
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<folding>
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<element signature="e#285#286#0" expanded="true" />
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<element signature="e#323#324#0" expanded="true" />
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</entry>
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<entry file="file://$PROJECT_DIR$/.gitignore">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="544">
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<caret line="34" column="12" selection-start-line="34" selection-start-column="12" selection-end-line="34" selection-end-column="12" />
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</state>
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</provider>
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</entry>
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7
errors/Cargo.toml
Normal file
7
errors/Cargo.toml
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@ -0,0 +1,7 @@
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[package]
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name = "errors"
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version = "0.1.0"
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authors = ["Timothy Warren <twarren@nabancard.com>"]
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edition = "2018"
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[dependencies]
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65
errors/src/main.rs
Normal file
65
errors/src/main.rs
Normal file
@ -0,0 +1,65 @@
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use std::fs;
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use std::fs::File;
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use std::io::{Error, ErrorKind, Read};
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fn main() {
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let _str = handle_errors_with_match();
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let _str = match handle_errors_with_closures() {
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Ok(_) => println!("Opened or created the file successfully!"),
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Err(e) => panic!("There was a problem opening the file: {:?}", e),
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};
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let _str = match read_username_from_file() {
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Ok(_) => println!("Opened or created the file successfully!"),
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Err(e) => panic!("There was a problem opening the file: {:?}", e),
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};
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let _str = match easy_mode() {
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Ok(_) => println!("Opened or created the file successfully!"),
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Err(e) => panic!("There was a problem opening the file: {:?}", e),
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};
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}
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fn easy_mode() -> Result<String, Error> {
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fs::read_to_string("hello.txt")
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}
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fn read_username_from_file() -> Result<String, Error> {
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let mut s = String::new();
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File::open("hello.txt")?.read_to_string(&mut s)?;
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Ok(s)
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}
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fn handle_errors_with_closures () -> Result<File, File> {
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File::open("hello.txt").map_err(|error| {
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if error.kind() == ErrorKind::NotFound {
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File::create("hello.txt").unwrap_or_else(|error| {
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panic!("Tried to create file but there was a problem: {:?}", error);
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})
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} else {
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panic!("There was a problem opening the file: {:?}", error);
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}
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})
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}
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fn handle_errors_with_match () -> File {
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let f = File::open("hello.txt");
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let f = match f {
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Ok(file) => file,
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Err(error) => match error.kind() {
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ErrorKind::NotFound => match File::create("hello.txt") {
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Ok(fc) => fc,
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Err(e) => panic!("Tried to create file but there was a problem: {:?}", e),
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},
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other_error => panic!("There was a problem opening the file: {:?}", other_error),
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},
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};
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println!("Opened or created the file successfully!");
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f
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}
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