forked from hashicorp/nomad
/
schema.go
179 lines (165 loc) · 4.23 KB
/
schema.go
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package state
import (
"fmt"
"github.com/hashicorp/go-memdb"
)
// stateStoreSchema is used to return the schema for the state store
func stateStoreSchema() *memdb.DBSchema {
// Create the root DB schema
db := &memdb.DBSchema{
Tables: make(map[string]*memdb.TableSchema),
}
// Collect all the schemas that are needed
schemas := []func() *memdb.TableSchema{
indexTableSchema,
nodeTableSchema,
jobTableSchema,
evalTableSchema,
allocTableSchema,
}
// Add each of the tables
for _, schemaFn := range schemas {
schema := schemaFn()
if _, ok := db.Tables[schema.Name]; ok {
panic(fmt.Sprintf("duplicate table name: %s", schema.Name))
}
db.Tables[schema.Name] = schema
}
return db
}
// indexTableSchema is used for
func indexTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: "index",
Indexes: map[string]*memdb.IndexSchema{
"id": &memdb.IndexSchema{
Name: "id",
AllowMissing: false,
Unique: true,
Indexer: &memdb.StringFieldIndex{
Field: "Key",
Lowercase: true,
},
},
},
}
}
// nodeTableSchema returns the MemDB schema for the nodes table.
// This table is used to store all the client nodes that are registered.
func nodeTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: "nodes",
Indexes: map[string]*memdb.IndexSchema{
// Primary index is used for node management
// and simple direct lookup. ID is required to be
// unique.
"id": &memdb.IndexSchema{
Name: "id",
AllowMissing: false,
Unique: true,
Indexer: &memdb.StringFieldIndex{
Field: "ID",
Lowercase: true,
},
},
},
}
}
// jobTableSchema returns the MemDB schema for the jobs table.
// This table is used to store all the jobs that have been submitted.
func jobTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: "jobs",
Indexes: map[string]*memdb.IndexSchema{
// Primary index is used for job management
// and simple direct lookup. ID is required to be
// unique.
"id": &memdb.IndexSchema{
Name: "id",
AllowMissing: false,
Unique: true,
Indexer: &memdb.StringFieldIndex{
Field: "ID",
Lowercase: true,
},
},
},
}
}
// evalTableSchema returns the MemDB schema for the eval table.
// This table is used to store all the evaluations that are pending
// or recently completed.
func evalTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: "evals",
Indexes: map[string]*memdb.IndexSchema{
// Primary index is used for direct lookup.
"id": &memdb.IndexSchema{
Name: "id",
AllowMissing: false,
Unique: true,
Indexer: &memdb.UUIDFieldIndex{
Field: "ID",
},
},
// Job index is used to lookup allocations by job
"job": &memdb.IndexSchema{
Name: "job",
AllowMissing: false,
Unique: false,
Indexer: &memdb.StringFieldIndex{
Field: "JobID",
Lowercase: true,
},
},
},
}
}
// allocTableSchema returns the MemDB schema for the allocation table.
// This table is used to store all the task allocations between task groups
// and nodes.
func allocTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: "allocs",
Indexes: map[string]*memdb.IndexSchema{
// Primary index is a UUID
"id": &memdb.IndexSchema{
Name: "id",
AllowMissing: false,
Unique: true,
Indexer: &memdb.UUIDFieldIndex{
Field: "ID",
},
},
// Node index is used to lookup allocations by node
"node": &memdb.IndexSchema{
Name: "node",
AllowMissing: true, // Missing is allow for failed allocations
Unique: false,
Indexer: &memdb.StringFieldIndex{
Field: "NodeID",
Lowercase: true,
},
},
// Job index is used to lookup allocations by job
"job": &memdb.IndexSchema{
Name: "job",
AllowMissing: false,
Unique: false,
Indexer: &memdb.StringFieldIndex{
Field: "JobID",
Lowercase: true,
},
},
// Eval index is used to lookup allocations by eval
"eval": &memdb.IndexSchema{
Name: "eval",
AllowMissing: false,
Unique: false,
Indexer: &memdb.UUIDFieldIndex{
Field: "EvalID",
},
},
},
}
}