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GetSlotInfo: only list replication slots in peer's database (#1090)
Also introduce escape.go to help with properly escaping strings/identifiers Update all cases of `"%s"` / `'%s'` in queries in connectors/postgres
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| // from https://github.com/lib/pq/blob/v1.10.9/conn.go#L1656 | ||
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| package connpostgres | ||
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| import "strings" | ||
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| // QuoteLiteral quotes a 'literal' (e.g. a parameter, often used to pass literal | ||
| // to DDL and other statements that do not accept parameters) to be used as part | ||
| // of an SQL statement. For example: | ||
| // | ||
| // exp_date := pq.QuoteLiteral("2023-01-05 15:00:00Z") | ||
| // err := db.Exec(fmt.Sprintf("CREATE ROLE my_user VALID UNTIL %s", exp_date)) | ||
| // | ||
| // Any single quotes in name will be escaped. Any backslashes (i.e. "\") will be | ||
| // replaced by two backslashes (i.e. "\\") and the C-style escape identifier | ||
| // that PostgreSQL provides ('E') will be prepended to the string. | ||
| func QuoteLiteral(literal string) string { | ||
| // This follows the PostgreSQL internal algorithm for handling quoted literals | ||
| // from libpq, which can be found in the "PQEscapeStringInternal" function, | ||
| // which is found in the libpq/fe-exec.c source file: | ||
| // https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/interfaces/libpq/fe-exec.c | ||
| // | ||
| // substitute any single-quotes (') with two single-quotes ('') | ||
| literal = strings.Replace(literal, `'`, `''`, -1) | ||
| // determine if the string has any backslashes (\) in it. | ||
| // if it does, replace any backslashes (\) with two backslashes (\\) | ||
| // then, we need to wrap the entire string with a PostgreSQL | ||
| // C-style escape. Per how "PQEscapeStringInternal" handles this case, we | ||
| // also add a space before the "E" | ||
| if strings.Contains(literal, `\`) { | ||
| literal = strings.Replace(literal, `\`, `\\`, -1) | ||
| literal = ` E'` + literal + `'` | ||
| } else { | ||
| // otherwise, we can just wrap the literal with a pair of single quotes | ||
| literal = `'` + literal + `'` | ||
| } | ||
| return literal | ||
| } | ||
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| // QuoteIdentifier quotes an "identifier" (e.g. a table or a column name) to be | ||
| // used as part of an SQL statement. For example: | ||
| // | ||
| // tblname := "my_table" | ||
| // data := "my_data" | ||
| // quoted := pq.QuoteIdentifier(tblname) | ||
| // err := db.Exec(fmt.Sprintf("INSERT INTO %s VALUES ($1)", quoted), data) | ||
| // | ||
| // Any double quotes in name will be escaped. The quoted identifier will be | ||
| // case sensitive when used in a query. If the input string contains a zero | ||
| // byte, the result will be truncated immediately before it. | ||
| func QuoteIdentifier(name string) string { | ||
| end := strings.IndexRune(name, 0) | ||
| if end > -1 { | ||
| name = name[:end] | ||
| } | ||
| return `"` + strings.Replace(name, `"`, `""`, -1) + `"` | ||
| } |
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