forked from TrueCloudLab/frostfs-node
Evgenii Stratonikov
001a23eb31
JSON format is rather verbose an inconvenient to be edited by hand. This commit implements SQL-like language for representing placement policy. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
60 lines
1.1 KiB
Go
60 lines
1.1 KiB
Go
package policy
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import (
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"github.com/alecthomas/participle"
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)
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var parser *participle.Parser
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func init() {
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p, err := participle.Build(&query{})
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if err != nil {
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panic(err)
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}
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parser = p
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}
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type query struct {
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Replicas []*replicaStmt `@@+`
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CBF uint32 `("CBF" @Int)?`
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Selectors []*selectorStmt `@@*`
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Filters []*filterStmt `@@*`
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}
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type replicaStmt struct {
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Count int `"REP" @Int`
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Selector string `("IN" @Ident)?`
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}
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type selectorStmt struct {
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Count uint32 `"SELECT" @Int`
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Clause string `"IN" @("SAME" | "DISTINCT")?`
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Bucket string `@Ident`
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Filter string `"FROM" @(Ident | "*")`
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Name string `("AS" @Ident)?`
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}
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type filterStmt struct {
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Value *orChain `"FILTER" @@`
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Name string `"AS" @Ident`
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}
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type filterOrExpr struct {
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Reference string `"@"@Ident`
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Expr *simpleExpr `| @@`
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}
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type orChain struct {
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Clauses []*andChain `@@ ("OR" @@)*`
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}
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type andChain struct {
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Clauses []*filterOrExpr `@@ ("AND" @@)*`
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}
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type simpleExpr struct {
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Key string `@Ident`
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// We don't use literals here to improve error messages.
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Op string `@Ident`
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Value string `@(Ident | String | Int)`
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}
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