Add metadata field for error messages:

bmc/bmc.go

@@ -10,4 +10,6 @@ type Metadata struct {
 	SuccessfulOpenConns []string
 	// SuccessfulCloseConns is a slice of provider names that were closed successfully
 	SuccessfulCloseConns []string
+	// FailedProviderDetail holds the failed providers error messages for called methods
+	FailedProviderDetail map[string]string
 }

bmc/boot_device.go

@@ -25,7 +25,9 @@ type bootDeviceProviders struct {
 // setPersistent persists the next boot device.
 // efiBoot sets up the device to boot off UEFI instead of legacy.
 func setBootDevice(ctx context.Context, timeout time.Duration, bootDevice string, setPersistent, efiBoot bool, b []bootDeviceProviders) (ok bool, metadata Metadata, err error) {
-	var metadataLocal Metadata
+	metadataLocal := Metadata{
+		FailedProviderDetail: make(map[string]string),
+	}
 
 	for _, elem := range b {
 		if elem.bootDeviceSetter == nil {
@@ -43,6 +45,7 @@ func setBootDevice(ctx context.Context, timeout time.Duration, bootDevice string
 			ok, setErr := elem.bootDeviceSetter.BootDeviceSet(ctx, bootDevice, setPersistent, efiBoot)
 			if setErr != nil {
 				err = multierror.Append(err, errors.WithMessagef(setErr, "provider: %v", elem.name))
+				metadataLocal.FailedProviderDetail[elem.name] = setErr.Error()
 				continue
 			}
 			if !ok {

bmc/connection.go

@@ -29,8 +29,10 @@ type connectionProviders struct {
 // OpenConnectionFromInterfaces will try all opener interfaces and remove failed ones.
 // The reason failed ones need to be removed is so that when other methods are called (like powerstate)
 // implementations that have connections wont nil pointer error when their connection fails.
-func OpenConnectionFromInterfaces(ctx context.Context, timeout time.Duration, providers []interface{}) (opened []interface{}, _ Metadata, err error) {
-	var metadata Metadata
+func OpenConnectionFromInterfaces(ctx context.Context, timeout time.Duration, providers []interface{}) (opened []interface{}, metadata Metadata, err error) {
+	metadata = Metadata{
+		FailedProviderDetail: make(map[string]string),
+	}
 
 	// Return immediately if the context is done.
 	select {
@@ -92,6 +94,7 @@ func OpenConnectionFromInterfaces(ctx context.Context, timeout time.Duration, pr
 	for res := range results {
 		if res.Err != nil {
 			err = multierror.Append(err, res.Err)
+			metadata.FailedProviderDetail[res.ProviderName] = res.Err.Error()
 			continue
 		}
 
@@ -108,7 +111,9 @@ func OpenConnectionFromInterfaces(ctx context.Context, timeout time.Duration, pr
 
 // closeConnection closes a connection to a BMC, trying all interface implementations passed in
 func closeConnection(ctx context.Context, c []connectionProviders) (_ Metadata, err error) {
-	var metadata Metadata
+	var metadata = Metadata{
+		FailedProviderDetail: make(map[string]string),
+	}
 	var connClosed bool
 
 	for _, elem := range c {
@@ -119,6 +124,7 @@ func closeConnection(ctx context.Context, c []connectionProviders) (_ Metadata,
 		closeErr := elem.closer.Close(ctx)
 		if closeErr != nil {
 			err = multierror.Append(err, errors.WithMessagef(closeErr, "provider: %v", elem.name))
+			metadata.FailedProviderDetail[elem.name] = closeErr.Error()
 			continue
 		}
 		connClosed = true

bmc/power.go

@@ -38,8 +38,10 @@ type powerProviders struct {
 }
 
 // setPowerState sets the power state for a BMC, trying all interface implementations passed in
-func setPowerState(ctx context.Context, timeout time.Duration, state string, p []powerProviders) (ok bool, metadata Metadata, err error) {
-	var metadataLocal Metadata
+func setPowerState(ctx context.Context, timeout time.Duration, state string, p []powerProviders) (ok bool, m Metadata, err error) {
+	metadataLocal := Metadata{
+		FailedProviderDetail: make(map[string]string),
+	}
 
 	for _, elem := range p {
 		if elem.powerSetter == nil {
@@ -49,14 +51,15 @@ func setPowerState(ctx context.Context, timeout time.Duration, state string, p [
 		case <-ctx.Done():
 			err = multierror.Append(err, ctx.Err())
 
-			return false, metadata, err
+			return false, metadataLocal, err
 		default:
 			metadataLocal.ProvidersAttempted = append(metadataLocal.ProvidersAttempted, elem.name)
 			ctx, cancel := context.WithTimeout(ctx, timeout)
 			defer cancel()
 			ok, setErr := elem.powerSetter.PowerSet(ctx, state)
 			if setErr != nil {
 				err = multierror.Append(err, errors.WithMessagef(setErr, "provider: %v", elem.name))
+				metadataLocal.FailedProviderDetail[elem.name] = setErr.Error()
 				continue
 			}
 			if !ok {
@@ -91,7 +94,10 @@ func SetPowerStateFromInterfaces(ctx context.Context, timeout time.Duration, sta
 }
 
 // getPowerState gets the power state for a BMC, trying all interface implementations passed in
-func getPowerState(ctx context.Context, timeout time.Duration, p []powerProviders) (state string, metadata Metadata, err error) {
+func getPowerState(ctx context.Context, timeout time.Duration, p []powerProviders) (state string, m Metadata, err error) {
+	metadataLocal := Metadata{
+		FailedProviderDetail: make(map[string]string),
+	}
 	for _, elem := range p {
 		if elem.powerStateGetter == nil {
 			continue
@@ -100,21 +106,22 @@ func getPowerState(ctx context.Context, timeout time.Duration, p []powerProvider
 		case <-ctx.Done():
 			err = multierror.Append(err, ctx.Err())
 
-			return state, metadata, err
+			return state, metadataLocal, err
 		default:
-			metadata.ProvidersAttempted = append(metadata.ProvidersAttempted, elem.name)
+			metadataLocal.ProvidersAttempted = append(metadataLocal.ProvidersAttempted, elem.name)
 			ctx, cancel := context.WithTimeout(ctx, timeout)
 			defer cancel()
 			state, stateErr := elem.powerStateGetter.PowerStateGet(ctx)
 			if stateErr != nil {
 				err = multierror.Append(err, errors.WithMessagef(stateErr, "provider: %v", elem.name))
+				metadataLocal.FailedProviderDetail[elem.name] = stateErr.Error()
 				continue
 			}
-			metadata.SuccessfulProvider = elem.name
-			return state, metadata, nil
+			metadataLocal.SuccessfulProvider = elem.name
+			return state, metadataLocal, nil
 		}
 	}
-	return state, metadata, multierror.Append(err, errors.New("failed to get power state"))
+	return state, metadataLocal, multierror.Append(err, errors.New("failed to get power state"))
 }
 
 // GetPowerStateFromInterfaces identifies implementations of the PostStateGetter interface and passes the found implementations to the getPowerState() wrapper.

client_test.go

@@ -21,38 +21,36 @@ func TestBMC(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
 	defer cancel()
 	cl := NewClient(host, user, pass, WithLogger(log), WithPerProviderTimeout(5*time.Second))
-	cl.FilterForCompatible(ctx)
-	var err error
-	err = cl.Open(ctx)
+	err := cl.Open(ctx)
 	if err != nil {
 		t.Logf("%+v", cl.GetMetadata())
 		t.Fatal(err)
 	}
 	defer cl.Close(ctx)
-	t.Logf("metadata: %+v", cl.GetMetadata())
+	t.Logf("metadata for Open: %+v", cl.GetMetadata())
 
 	cl.Registry.Drivers = cl.Registry.PreferDriver("non-existent")
 	state, err := cl.GetPowerState(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
 	t.Log(state)
-	t.Logf("metadata %+v", cl.GetMetadata())
+	t.Logf("metadata for GetPowerState: %+v", cl.GetMetadata())
 
 	cl.Registry.Drivers = cl.Registry.PreferDriver("ipmitool")
 	state, err = cl.PreferProvider("gofish").GetPowerState(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
 	t.Log(state)
-	t.Logf("metadata: %+v", cl.GetMetadata())
+	t.Logf("metadata for GetPowerState: %+v", cl.GetMetadata())
 
 	users, err := cl.ReadUsers(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
 	t.Log(users)
-	t.Logf("metadata: %+v", cl.GetMetadata())
+	t.Logf("metadata for ReadUsers: %+v", cl.GetMetadata())
 
 	t.Fatal()
 }