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datastore: add generation, simple atomicity.

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We add a generation counter, and allow update or del conditional
on a given generation.

Formalizes error codes, too, since we have more now.

Suggested-by: @shesek
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2021-08-25 12:21:04 +09:30
committed by Christian Decker
parent 432508e65e
commit 533571a655
18 changed files with 241 additions and 117 deletions
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22
wallet/db_postgres_sqlgen.c generated
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@@ -1023,8 +1023,8 @@ struct db_query db_postgres_queries[] = {
.readonly = false,
},
{
.name = "CREATE TABLE datastore ( key TEXT, data BLOB, PRIMARY KEY (key));",
.query = "CREATE TABLE datastore ( key TEXT, data BYTEA, PRIMARY KEY (key));",
.name = "CREATE TABLE datastore ( key TEXT, data BLOB, generation BIGINT, PRIMARY KEY (key));",
.query = "CREATE TABLE datastore ( key TEXT, data BYTEA, generation BIGINT, PRIMARY KEY (key));",
.placeholders = 0,
.readonly = false,
},
@@ -2007,14 +2007,14 @@ struct db_query db_postgres_queries[] = {
.readonly = true,
},
{
.name = "UPDATE datastore SET data=? WHERE key=?;",
.query = "UPDATE datastore SET data=$1 WHERE key=$2;",
.name = "UPDATE datastore SET data=?, generation=generation+1 WHERE key=?;",
.query = "UPDATE datastore SET data=$1, generation=generation+1 WHERE key=$2;",
.placeholders = 2,
.readonly = false,
},
{
.name = "INSERT INTO datastore VALUES (?, ?);",
.query = "INSERT INTO datastore VALUES ($1, $2);",
.name = "INSERT INTO datastore VALUES (?, ?, 0);",
.query = "INSERT INTO datastore VALUES ($1, $2, 0);",
.placeholders = 2,
.readonly = false,
},
@@ -2025,14 +2025,14 @@ struct db_query db_postgres_queries[] = {
.readonly = false,
},
{
.name = "SELECT data FROM datastore WHERE key = ?;",
.query = "SELECT data FROM datastore WHERE key = $1;",
.name = "SELECT data, generation FROM datastore WHERE key = ?;",
.query = "SELECT data, generation FROM datastore WHERE key = $1;",
.placeholders = 1,
.readonly = true,
},
{
.name = "SELECT key, data FROM datastore;",
.query = "SELECT key, data FROM datastore;",
.name = "SELECT key, data, generation FROM datastore;",
.query = "SELECT key, data, generation FROM datastore;",
.placeholders = 0,
.readonly = true,
},
@@ -2068,4 +2068,4 @@ struct db_query db_postgres_queries[] = {
#endif /* LIGHTNINGD_WALLET_GEN_DB_POSTGRES */
// SHA256STAMP:5b2863e970ee24f2552e45224fed3f248badc9fd87ee3ab3ff0458fe3bcc0a83
// SHA256STAMP:247577c68e8e536ee1736ddce425efb58ff609c1d3d4fbb1148b5c65b8922741