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package server
import (
"testing"
"github.com/mimecast/dtail/internal/mapr"
)
// TestResolveParserName locks the log-format selection rules that decide which
// parser (and therefore which fields) a mapr query gets. These rules are the
// root cause of a common surprise: a query without a "from TABLE" clause is
// downgraded to the "generic" parser, which exposes none of the dynamic
// key=value fields or the default-format "$"-variables. See
// doc/querylanguage.md ("Selecting the log format and dynamic fields").
func TestResolveParserName(t *testing.T) {
tests := []struct {
name string
query string
configured string
want string
}{
{
name: "explicit logformat wins over everything",
query: "from STATS select $line logformat generickv",
want: "generickv",
},
{
name: "explicit logformat wins even without a from clause",
query: "select service logformat generickv",
want: "generickv",
},
{
name: "no from clause downgrades to generic",
query: "select service,sum(bytes) group by service",
want: "generic",
},
{
name: "from TABLE without configured format uses default",
query: "from STATS select lifetimeConnections",
want: "default",
},
{
name: "from TABLE honours the configured default format",
query: "from STATS select lifetimeConnections",
configured: "mimecast",
want: "mimecast",
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
query, err := mapr.NewQuery(tc.query)
if err != nil {
t.Fatalf("NewQuery(%q) failed: %v", tc.query, err)
}
if got := resolveParserName(query, tc.configured); got != tc.want {
t.Errorf("resolveParserName(%q, %q) = %q, want %q",
tc.query, tc.configured, got, tc.want)
}
})
}
}
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