Added HTTP endpoints for Correctness counts

golden/go/db/db.go

 package db
 
 import (
         "fmt"
 
         "github.com/golang/glog"
         "skia.googlesource.com/buildbot.git/go/database"
         "skia.googlesource.com/buildbot.git/go/metadata"
 )
 
 const (
         // Key of the password for the readwrite user.
         METADATA_KEY = "readwrite"
 )
 
-// The migration steps for this DB.
+// MigrationSteps returns the migration (up and down) for the database.
 func MigrationSteps() []database.MigrationStep {
         return migrationSteps
 }
 
-// Returns the DB connection string for running in production where a
-// metadata server is available. If 'local' is true it will always return
-// "" (empty string). When used with Init() this will cause it to use a
-// local SQLite database. If it's not local and the meta data server is
-// unreachable it will terminate.
-func GetDatabase(mySQLConnStr string, sqlitePath string, local bool) *database.DatabaseConfig {
+// GetConfig returns a DatabaseConfig instance for running in production if a
+// metadata server is available. If 'local' is true it will always
+// set the MySQL connection string to "" and thus use a local SQLite database
+// when used with database.NewVersionedDB.
+func GetConfig(mySQLConnStr string, sqlitePath string, local bool) *database.DatabaseConfig {
         useMySQLConnStr := mySQLConnStr
 
         // We are in the production environment, so we look up the password.
         if !local {
                 //  First, get the password from the metadata server.
                 // See https://developers.google.com/compute/docs/metadata#custom.
                 password, err := metadata.Get(METADATA_KEY)
                 if err != nil {
                         glog.Fatalf("Failed to find metadata. Use 'local' flag when running locally.")
                 }
                 useMySQLConnStr = fmt.Sprintf(mySQLConnStr, password)
         }
 
         return &database.DatabaseConfig{
                 MySQLString:    useMySQLConnStr,
                 SQLiteFilePath: sqlitePath,
                 MigrationSteps: migrationSteps,
         }
 }
 
-// Define the migration steps.
+// migrationSteps define the steps it takes to migrate the db between versions.
 // Note: Only add to this list, once a step has landed in version control it
 // must not be changed.
 var migrationSteps = []database.MigrationStep{
         // version 1
         {
                 MySQLUp: []string{
                         `CREATE TABLE expectations (
                                 id            INT        NOT NULL AUTO_INCREMENT PRIMARY KEY,
                                 userid        TEXT       NOT NULL,
                                 ts            BIGINT     NOT NULL,
@@ skipping 18 matching lines @@
 
         // Use this is a template for more migration steps.
         // version x
         // {
         //      MySQLUp: ,
         //      MySQLDown: ,
         //      SQLiteUp: ,
         //      SQLiteDown: ,
         // },
 }