40 lines
1.5 KiB
Go
40 lines
1.5 KiB
Go
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package cif
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import (
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"fmt"
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"time"
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"git.fjla.uk/owlboard/go-types/pkg/upstreamApi"
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"git.fjla.uk/owlboard/timetable-mgr/dbAccess"
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)
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// Evaluates last and new metadata and determines whether an update is required.
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// // If last update == "full" && lastupdate after yesterday at 0600, run update.
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// // Beyond that condition, comparisons are made between old and new metadata.
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func checkMetadata(oldMeta *dbAccess.CifMetadata, newMeta *upstreamApi.JsonTimetableV1) (reason string, updateRequired bool) {
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// Handle nil pointer - although this should be resolved in the calling function in ideal situations
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if oldMeta == nil || newMeta == nil {
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return "nil-pointer", false
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}
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// Handle non-matching sequence numbers between full and daily download types
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if isAfterYesterdayAt0600(oldMeta.LastUpdate) {
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return "last-update-full", true
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}
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// Check that the new metadata sequence is as expected.
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if newMeta.Metadata.Sequence == oldMeta.LastSequence+1 {
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return "correct-sequence", true
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} else {
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s := fmt.Sprintf("incorrect sequence, Old: %d, New: %d, Expected New: %d", oldMeta.LastSequence, newMeta.Metadata.Sequence, oldMeta.LastSequence+1)
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return s, false
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}
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}
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// Evaluates whether the given time is after yesterday at 0600
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func isAfterYesterdayAt0600(t time.Time) bool {
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yesterday0600 := time.Now().In(time.UTC).AddDate(0, 0, -1)
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yesterday0600 = time.Date(yesterday0600.Year(), yesterday0600.Month(), yesterday0600.Day(), 6, 0, 0, 0, time.UTC)
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return t.After(yesterday0600)
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}
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