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5336362e64
- Wrap each prober function into a probe class that allows associating metric labels and custom metrics with a given probe; - Make sure all existing probe classes set a `class` metric label; - Move bandwidth probe size from being a metric label to a separate gauge metric; this will make it possible to use it to calculate average used bandwidth using a PromQL query; - Also export transfer time for the bandwidth prober (more accurate than the total probe time, since it excludes connection establishment time). Updates tailscale/corp#17912 Signed-off-by: Anton Tolchanov <anton@tailscale.com>
117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package prober
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import (
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"context"
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"fmt"
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"net/netip"
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"slices"
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"sync"
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"testing"
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"tailscale.com/syncs"
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)
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func TestForEachAddr(t *testing.T) {
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clk := newFakeTime()
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p := newForTest(clk.Now, clk.NewTicker)
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opts := ForEachAddrOpts{
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Logf: t.Logf,
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Networks: []string{"ip4", "ip6"},
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}
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var (
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addr4_1 = netip.MustParseAddr("76.76.21.21")
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addr4_2 = netip.MustParseAddr("127.0.0.1")
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addr6_1 = netip.MustParseAddr("2600:9000:a602:b1e6:5b89:50a1:7cf7:67b8")
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addr6_2 = netip.MustParseAddr("2600:9000:a51d:27c1:6748:d035:a989:fb3c")
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)
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var resolverAddrs4, resolverAddrs6 syncs.AtomicValue[[]netip.Addr]
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resolverAddrs4.Store([]netip.Addr{addr4_1})
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resolverAddrs6.Store([]netip.Addr{addr6_1, addr6_2})
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opts.LookupNetIP = func(_ context.Context, network string, _ string) ([]netip.Addr, error) {
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if network == "ip4" {
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return resolverAddrs4.Load(), nil
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} else if network == "ip6" {
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return resolverAddrs6.Load(), nil
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}
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return nil, fmt.Errorf("unknown network %q", network)
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}
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var (
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mu sync.Mutex // protects following
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registered []netip.Addr
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)
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newProbe := func(addr netip.Addr) []*Probe {
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// Called to register a new prober
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t.Logf("called to register new probe for %v", addr)
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mu.Lock()
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defer mu.Unlock()
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registered = append(registered, addr)
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// Return a probe that does nothing; we don't care about what this does.
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probe := p.Run(fmt.Sprintf("website/%s", addr), probeInterval, nil, FuncProbe(func(_ context.Context) error {
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return nil
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}))
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return []*Probe{probe}
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}
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fep := makeForEachAddr("tailscale.com", newProbe, opts)
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// Mimic a call from the prober; we do this ourselves instead of
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// calling it via p.Run so we know that the probe has actually run.
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ctx := context.Background()
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if err := fep.run(ctx); err != nil {
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t.Fatalf("run: %v", err)
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}
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mu.Lock()
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wantAddrs := []netip.Addr{addr4_1, addr6_1, addr6_2}
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if !slices.Equal(registered, wantAddrs) {
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t.Errorf("got registered addrs %v; want %v", registered, wantAddrs)
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}
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mu.Unlock()
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// Now, update our IP addresses to force the prober to close and
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// re-create our probes.
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resolverAddrs4.Store([]netip.Addr{addr4_2})
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resolverAddrs6.Store([]netip.Addr{addr6_2})
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// Clear out our test data.
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mu.Lock()
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registered = nil
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mu.Unlock()
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// Run our individual prober again manually (so we don't have to wait
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// or coordinate with the created probers).
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if err := fep.run(ctx); err != nil {
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t.Fatalf("run: %v", err)
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}
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// Ensure that we only registered our net-new address (addr4_2).
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mu.Lock()
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wantAddrs = []netip.Addr{addr4_2}
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if !slices.Equal(registered, wantAddrs) {
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t.Errorf("got registered addrs %v; want %v", registered, wantAddrs)
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}
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mu.Unlock()
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// Check that we don't have a probe for the addresses that we expect to
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// have been removed (addr4_1 and addr6_1).
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p.mu.Lock()
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for _, addr := range []netip.Addr{addr4_1, addr6_1} {
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_, ok := fep.probes[addr]
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if ok {
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t.Errorf("probe for %v still exists", addr)
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}
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}
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p.mu.Unlock()
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}
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