1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164

// Copyright 2023 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use {
    anyhow::{anyhow, Result},
    fidl_fuchsia_driver_development as fdd,
    futures::{channel::mpsc, StreamExt},
    std::collections::{HashMap, HashSet},
};

// Wait for the events from the |nodes| to be received. Updates the entries to be Some.
pub async fn wait_for_nodes(
    nodes: &mut HashMap<String, Option<Option<u64>>>,
    receiver: &mut mpsc::Receiver<(String, String)>,
) -> Result<()> {
    while nodes.values().any(|&x| x.is_none()) {
        let (from_node, _) = receiver.next().await.ok_or(anyhow!("Receiver failed"))?;
        if !nodes.contains_key(&from_node) {
            return Err(anyhow!("Couldn't find node '{}' in 'nodes'.", from_node.to_string()));
        }
        nodes.entry(from_node).and_modify(|x| {
            *x = Some(None);
        });
    }

    Ok(())
}

// Validates the host koids given the device infos.
// Performs the following:
// - Stores the host koid for nodes in changed_or_new as those are expected to be new/changed.
// - Validate bound nodes are not in should_not_exist
// - Validate bound nodes have the same koid as the most recent item in previous.
// - Validate that items in changed_or_new have been changed from the most recent item in previous
//   if they are not new.
pub async fn validate_host_koids(
    test_stage_name: &str,
    device_infos: Vec<fdd::NodeInfo>,
    changed_or_new: &mut HashMap<String, Option<Option<u64>>>,
    previous: Vec<&HashMap<String, Option<Option<u64>>>>,
    should_not_exist: Option<&HashSet<String>>,
) -> Result<()> {
    for dev in &device_infos {
        let key = dev.moniker.clone().unwrap().split(".").last().unwrap().to_string();

        // Items in changed_or_new are expected to be different so just save that info and move on.
        if changed_or_new.contains_key(&key) {
            changed_or_new.entry(key).and_modify(|x| {
                *x = Some(dev.driver_host_koid);
            });

            continue;
        }

        // Skip comparison and should_not_exist check as the koid is not valid when its unbound.
        if dev.bound_driver_url == Some("unbound".to_string()) {
            continue;
        }

        // Error if the item is in should not exist.
        if let Some(should_not_exist_value) = &should_not_exist {
            if should_not_exist_value.contains(&key) {
                return Err(anyhow!(
                    "Found node that should not exist after {}: '{}'.",
                    test_stage_name,
                    key
                ));
            }
        }

        // Go through the previous items (which should come in from most to least recent order)
        // and make sure this matches the most recent instance.
        for prev in &previous {
            if let Some(prev_koid) = prev.get(&key) {
                match prev_koid {
                    Some(prev_koid_value) => {
                        if *prev_koid_value != dev.driver_host_koid {
                            return Err(anyhow!(
                                "koid should not have changed for node '{}' after {}.",
                                key,
                                test_stage_name
                            ));
                        }

                        break;
                    }
                    None => {
                        // This is not possible as things are today.
                        // The values in the entries cannot be None since in wait_for_nodes we have
                        // waited for all of them to not be None.
                        return Err(anyhow!("prev koid not available after."));
                    }
                }
            }
        }
    }

    // Now we can make sure those items in changed_or_new are different than their most recent
    // previous item. Skipping ones that are not seen in previous.
    for (key, changed_or_new_node_entry) in changed_or_new {
        // First find the most recent previous koid if one exists.
        let mut koid_before: Option<&Option<u64>> = None;
        for prev in &previous {
            if let Some(prev_koid) = prev.get(key) {
                match prev_koid {
                    Some(prev_koid_value) => {
                        koid_before = Some(prev_koid_value);
                        break;
                    }
                    None => {
                        // This is not possible as things are today.
                        // The values in the entries cannot be None since in wait_for_nodes we have
                        // waited for all of them to not be None.
                        return Err(anyhow!("previous map entry cannot have None outer option."));
                    }
                }
            }
        }

        // Now compare it with current to make sure it is different.
        match koid_before {
            Some(koid_before) => match koid_before {
                Some(koid_before) => match changed_or_new_node_entry {
                    Some(koid_after) => match koid_after {
                        Some(koid_after) => {
                            // The node had a koid in both current and previous. Ensure that the
                            // koid value is different.
                            if koid_before == koid_after {
                                return Err(anyhow!(
                                    "koid should have changed for node '{}' after {}.",
                                    key,
                                    test_stage_name
                                ));
                            }
                        }
                        None => {
                            // The current node doesn't contain a koid.
                            // This can happen if the node is a composite parent, or if it is unbound.
                            continue;
                        }
                    },
                    None => {
                        // This is not possible as things are today.
                        // The values in the entries cannot be None since in wait_for_nodes we have
                        // waited for all of them to not be None.
                        return Err(anyhow!("changed_or_new_node entry cannot be None."));
                    }
                },
                None => {
                    // This node existed in a previous item, but it didn't contain a koid.
                    // This can happen if the node was a composite parent, or if it was unbound.
                    continue;
                }
            },
            None => {
                // This is a new node and it doesn't exist in previous.
                continue;
            }
        }
    }

    Ok(())
}