Test the --back-log value gets written to config.yaml

go/cmd/dolt/commands/sqlserver/command_line_config.go

@@ -172,7 +172,7 @@ func NewCommandLineConfig(creds *cli.UserPassword, apr *argparser.ArgParseResult
 	}
 
 	if maxWaitConnections, ok := apr.GetInt(maxWaitConnectionsFlag); ok {
-		config.maxWaitConnections = uint32(maxWaitConnections)
+		config.withMaxWaitConnections(uint32(maxWaitConnections))
 	}
 
 	config.autoCommit = !apr.Contains(noAutoCommitFlag)
@@ -437,6 +437,12 @@ func (cfg *commandLineServerConfig) withMaxConnections(maxConnections uint64) *c
 	return cfg
 }
 
+func (cfg *commandLineServerConfig) withMaxWaitConnections(maxWaitConnections uint32) *commandLineServerConfig {
+	cfg.maxWaitConnections = maxWaitConnections
+	cfg.valuesSet[servercfg.MaxWaitConnectionsKey] = struct{}{}
+	return cfg
+}
+
 // withDataDir updates the path to a directory to use as the data dir.
 func (cfg *commandLineServerConfig) withDataDir(dataDir string) *commandLineServerConfig {
 	cfg.dataDir = dataDir

go/libraries/doltcore/servercfg/serverconfig.go

@@ -311,6 +311,7 @@ const (
 	DataDirKey                      = "data_dir"
 	CfgDirKey                       = "cfg_dir"
 	MaxConnectionsKey               = "max_connections"
+	MaxWaitConnectionsKey           = "back_log"
 	TLSKeyKey                       = "tls_key"
 	TLSCertKey                      = "tls_cert"
 	RequireSecureTransportKey       = "require_secure_transport"

go/libraries/doltcore/servercfg/yaml_config.go

@@ -198,6 +198,7 @@ func ServerConfigAsYAMLConfig(cfg ServerConfig) *YAMLConfig {
 			HostStr:                 ptr(cfg.Host()),
 			PortNumber:              ptr(cfg.Port()),
 			MaxConnections:          ptr(cfg.MaxConnections()),
+			BackLog:                 ptr(cfg.MaxWaitConnections()),
 			ReadTimeoutMillis:       ptr(cfg.ReadTimeout()),
 			WriteTimeoutMillis:      ptr(cfg.WriteTimeout()),
 			TLSKey:                  nillableStrPtr(cfg.TLSKey()),
@@ -268,6 +269,7 @@ func ServerConfigSetValuesAsYAMLConfig(cfg ServerConfig) *YAMLConfig {
 			HostStr:                 zeroIf(ptr(cfg.Host()), !cfg.ValueSet(HostKey)),
 			PortNumber:              zeroIf(ptr(cfg.Port()), !cfg.ValueSet(PortKey)),
 			MaxConnections:          zeroIf(ptr(cfg.MaxConnections()), !cfg.ValueSet(MaxConnectionsKey)),
+			BackLog:                 zeroIf(ptr(cfg.MaxWaitConnections()), !cfg.ValueSet(MaxWaitConnectionsKey)),
 			ReadTimeoutMillis:       zeroIf(ptr(cfg.ReadTimeout()), !cfg.ValueSet(ReadTimeoutKey)),
 			WriteTimeoutMillis:      zeroIf(ptr(cfg.WriteTimeout()), !cfg.ValueSet(WriteTimeoutKey)),
 			TLSKey:                  zeroIf(ptr(cfg.TLSKey()), !cfg.ValueSet(TLSKeyKey)),
@@ -958,6 +960,8 @@ func (cfg YAMLConfig) ValueSet(value string) bool {
 		return cfg.ListenerConfig.WriteTimeoutMillis != nil
 	case MaxConnectionsKey:
 		return cfg.ListenerConfig.MaxConnections != nil
+	case MaxWaitConnectionsKey:
+		return cfg.ListenerConfig.BackLog != nil
 	case EventSchedulerKey:
 		return cfg.BehaviorConfig.EventSchedulerStatus != nil
 	}

integration-tests/bats/sql-server-config-file-generation.bats

@@ -98,6 +98,7 @@ EOF
         --max-connections 77 \
         --timeout 7777777 \
         --allow-cleartext-passwords true \
+        --back-log 767 \
         --host 0.0.0.0
 
     run cat "$CONFIG_FILE_NAME"
@@ -108,6 +109,7 @@ EOF
     [[ "$output" =~ "read_timeout_millis: 7777777" ]] || false
     [[ "$output" =~ "write_timeout_millis: 7777777" ]] || false
     [[ "$output" =~ "allow_cleartext_passwords: true" ]] || false
+    [[ "$output" =~ "back_log: 767" ]] || false
 }
 
 @test "sql-server-config-file-generation: generated config file uses default values as placeholders for unset fields" {