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The watcher tests used a stand-in resolver and the resolver timeout test a stand-in DNS client, against the rule that DNS is never mocked. Watcher tests that look something up in DNS now run the real resolver against live servers, each attempt on a new watcher. A DNS change is tested by saving values live DNS never returns (names under .invalid, 192.0.2.1) in the state a check starts from, or by marking a real nameserver failed. The timeout test queries 192.0.2.1, where nothing answers. The live-DNS retry and concurrency limit moved from the resolver tests to internal/livedns, so both packages share them. NewFromLoggerWithClient had no other use and is gone. TESTING.md now states the README's rule. Model: opus-5-5
71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
// Package resolver provides iterative DNS resolution from root nameservers.
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// It traces the full delegation chain from IANA root servers through TLD
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// and domain nameservers, never relying on upstream recursive resolvers.
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package resolver
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import (
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"log/slog"
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"go.uber.org/fx"
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"sneak.berlin/go/dnswatcher/internal/logger"
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)
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// Query status constants matching the state model.
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const (
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StatusOK = "ok"
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StatusError = "error"
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StatusNXDomain = "nxdomain"
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StatusNoData = "nodata"
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StatusTimeout = "timeout"
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)
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// MaxCNAMEDepth is the maximum CNAME chain depth to follow.
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const MaxCNAMEDepth = 10
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// Params contains dependencies for Resolver.
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type Params struct {
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fx.In
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Logger *logger.Logger
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}
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// NameserverResponse holds one nameserver's response for a query.
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type NameserverResponse struct {
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Nameserver string
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Records map[string][]string
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Status string
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Error string
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}
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// Resolver performs iterative DNS resolution from root servers.
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type Resolver struct {
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log *slog.Logger
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client DNSClient
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tcp DNSClient
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}
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// New creates a new Resolver instance for use with uber/fx.
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func New(
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_ fx.Lifecycle,
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params Params,
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) (*Resolver, error) {
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return &Resolver{
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log: params.Logger.Get(),
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client: &udpClient{timeout: queryTimeoutDuration},
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tcp: &tcpClient{timeout: queryTimeoutDuration},
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}, nil
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}
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// NewFromLogger creates a Resolver directly from an slog.Logger,
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// useful for testing without the fx lifecycle.
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func NewFromLogger(log *slog.Logger) *Resolver {
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return &Resolver{
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log: log,
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client: &udpClient{timeout: queryTimeoutDuration},
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tcp: &tcpClient{timeout: queryTimeoutDuration},
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}
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}
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// Method implementations are in iterative.go.
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