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| Original file line number | Diff line number | Diff line change |
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| @@ -1,6 +1,6 @@ | ||
| module github.com/thediveo/lxkns | ||
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| go 1.21 | ||
| go 1.22 | ||
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| require ( | ||
| github.com/PaesslerAG/jsonpath v0.1.1 | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // Copyright 2024 Harald Albrecht. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| // use this file except in compliance with the License. You may obtain a copy | ||
| // of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| // License for the specific language governing permissions and limitations | ||
| // under the License. | ||
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| //go:build go1.23 | ||
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| package model | ||
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| import "iter" | ||
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| // Tasks returns an iterator over all tasks of the process identified by PID. In | ||
| // case of non-existing/invalid PIDs, Tasks returns an empty iterator. If the | ||
| // process table does not contain information about the tasks of the process, | ||
| // the iterator won't emit any tasks, not even the task group leader | ||
| // representing the process. | ||
| func (t ProcessTable) Tasks(pid PIDType) iter.Seq[*Task] { | ||
| return Tasks(t, pid) | ||
| } | ||
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| // Tasks returns an iterator over all tasks of the process identified by PID. In | ||
| // case of non-existing/invalid PIDs, Tasks returns an empty iterator. If the | ||
| // process table does not contain information about the tasks of the process, | ||
| // the iterator won't emit any tasks, not even the task group leader | ||
| // representing the process. | ||
| func Tasks(t ProcessTable, pid PIDType) iter.Seq[*Task] { | ||
| proc := t[pid] | ||
| if proc == nil { | ||
| return func(yield func(*Task) bool) {} | ||
| } | ||
| return func(yield func(*Task) bool) { | ||
| tasksOfProcess(proc, yield) | ||
| } | ||
| } | ||
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| // TasksRecursive returns an iterator over all tasks of the process identified | ||
| // by PID, as well as all tasks of children, grandchildren, et cetera. If the | ||
| // process table does not contain information about the tasks of the process, | ||
| // the iterator won't emit any tasks, not even the task group leader | ||
| // representing the process. | ||
| func (t ProcessTable) TasksRecursive(pid PIDType) iter.Seq[*Task] { | ||
| return TasksRecursive(t, pid) | ||
| } | ||
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| // TasksRecursive returns an iterator over all tasks of the process identified | ||
| // by PID, as well as all tasks of children, grandchildren, et cetera. If the | ||
| // process table does not contain information about the tasks of the process, | ||
| // the iterator won't emit any tasks, not even the task group leader | ||
| // representing the process. | ||
| func TasksRecursive(t ProcessTable, pid PIDType) iter.Seq[*Task] { | ||
| proc := t[pid] | ||
| if proc == nil { | ||
| return func(yield func(*Task) bool) {} | ||
| } | ||
| return func(yield func(*Task) bool) { | ||
| tasksRecursive(proc, yield) | ||
| } | ||
| } | ||
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| func tasksRecursive(proc *Process, yield func(*Task) bool) bool { | ||
| if !tasksOfProcess(proc, yield) { | ||
| return false | ||
| } | ||
| for _, child := range proc.Children { | ||
| if !tasksRecursive(child, yield) { | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } | ||
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| func tasksOfProcess(proc *Process, yield func(*Task) bool) bool { | ||
| for _, task := range proc.Tasks { | ||
| if !yield(task) { | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| // Copyright 2024 Harald Albrecht. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| // use this file except in compliance with the License. You may obtain a copy | ||
| // of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| // License for the specific language governing permissions and limitations | ||
| // under the License. | ||
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| //go:build go1.23 | ||
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| package model | ||
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| import ( | ||
| "iter" | ||
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| . "github.com/onsi/ginkgo/v2/dsl/core" | ||
| . "github.com/onsi/gomega" | ||
| ) | ||
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| func taskNames(it iter.Seq[*Task]) []string { | ||
| names := []string{} | ||
| for task := range it { | ||
| names = append(names, task.Name) | ||
| } | ||
| return names | ||
| } | ||
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| // Returns only the first task name and then tells the iterator to shut up. This | ||
| // exercises also the unhappy little paths... | ||
| func firstTaskName(it iter.Seq[*Task]) []string { | ||
| names := []string{} | ||
| for task := range it { | ||
| names = append(names, task.Name) | ||
| break | ||
| } | ||
| return names | ||
| } | ||
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| var _ = Describe("process and task iterators", func() { | ||
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| pt := ProcessTable{ | ||
| 42: { | ||
| ProTaskCommon: ProTaskCommon{Name: "pfoo"}, | ||
| Tasks: []*Task{ | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "rfoo"}, | ||
| }, | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "rbar"}, | ||
| }, | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "rbaz"}, | ||
| }, | ||
| }, | ||
| Children: []*Process{ | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "pfrobz"}, | ||
| Tasks: []*Task{ | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "ffrobz"}, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "pgnampf"}, | ||
| Tasks: []*Task{ | ||
| { | ||
| ProTaskCommon: ProTaskCommon{Name: "fgnampf"}, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
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| It("iterates over tasks of a single process", func() { | ||
| Expect(taskNames(Tasks(pt, 0))).To(BeEmpty()) | ||
| Expect(firstTaskName(Tasks(pt, 42))).To(ConsistOf("rfoo")) | ||
| Expect(taskNames(Tasks(pt, 42))).To(ConsistOf( | ||
| "rfoo", "rbar", "rbaz")) | ||
| }) | ||
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| It("iterates over tasks of processes recursively", func() { | ||
| Expect(taskNames(TasksRecursive(pt, 0))).To(BeEmpty()) | ||
| Expect(firstTaskName(TasksRecursive(pt, 42))).To(ConsistOf("rfoo")) | ||
| Expect(taskNames(TasksRecursive(pt, 42))).To(ConsistOf( | ||
| "rfoo", "rbar", "rbaz", "ffrobz", "fgnampf")) | ||
| }) | ||
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| }) |