Pass Ambar API Errors to Terraform

Handle taking Ambar API Exceptions and correctly outputting them to Terraform
for more useful error when doing Terraform template files.

internal/provider/data_destination_resource.go

@@ -15,6 +15,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/types"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
+	"io"
 	"net/http"
 	"strconv"
 	"time"
@@ -154,9 +155,13 @@ func (r *DataDestinationResource) Create(ctx context.Context, req resource.Creat
 	// Create the API call and execute it
 	createResourceResponse, httpResponse, err := r.client.AmbarAPI.CreateDataDestination(ctx).CreateDataDestinationRequest(createDataDestination).Execute()
 	if err != nil || createResourceResponse == nil || httpResponse == nil {
+		tflog.Debug(ctx, "StatusCode: "+httpResponse.Status)
+		httpBody, _ := io.ReadAll(httpResponse.Body)
+		errString := string(httpBody)
+		tflog.Debug(ctx, errString)
 		resp.Diagnostics.AddError(
 			"Error creating DataDestination",
-			"Could not create DataDestination, unexpected error: "+err.Error(),
+			"Could not create DataDestination: "+AmbarApiErrorToTerraformErrorString(errString),
 		)
 		return
 	}

internal/provider/data_source_resource.go

@@ -15,6 +15,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/types"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
+	"io"
 	"net/http"
 	"strconv"
 	"strings"
@@ -160,9 +161,13 @@ func (r *dataSourceResource) Create(ctx context.Context, req resource.CreateRequ
 	// Create the API call and execute it
 	createResourceResponse, httpResponse, err := r.client.AmbarAPI.CreateDataSource(ctx).CreateDataSourceRequest(createDataSource).Execute()
 	if err != nil || createResourceResponse == nil || httpResponse == nil {
+		tflog.Debug(ctx, "StatusCode: "+httpResponse.Status)
+		httpBody, _ := io.ReadAll(httpResponse.Body)
+		errString := string(httpBody)
+		tflog.Debug(ctx, errString)
 		resp.Diagnostics.AddError(
 			"Error creating DataSource",
-			"Could not create DataSource, unexpected error: "+err.Error(),
+			"Could not create DataSource: "+AmbarApiErrorToTerraformErrorString(errString),
 		)
 		return
 	}

internal/provider/filter_resource.go

@@ -15,6 +15,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/types"
 	"github.com/hashicorp/terraform-plugin-log/tflog"
+	"io"
 	"net/http"
 	"strconv"
 	"time"
@@ -146,9 +147,13 @@ func (r *FilterResource) Create(ctx context.Context, req resource.CreateRequest,
 	// Create the API call and execute it
 	createResourceResponse, httpResponse, err := r.client.AmbarAPI.CreateFilter(ctx).CreateFilterRequest(createFilter).Execute()
 	if err != nil || createResourceResponse == nil || httpResponse == nil {
+		tflog.Debug(ctx, "StatusCode: "+httpResponse.Status)
+		httpBody, _ := io.ReadAll(httpResponse.Body)
+		errString := string(httpBody)
+		tflog.Debug(ctx, errString)
 		resp.Diagnostics.AddError(
 			"Error creating Filter",
-			"Could not create Filter, unexpected error: "+err.Error(),
+			"Could not create Filter: "+AmbarApiErrorToTerraformErrorString(errString),
 		)
 		return
 	}

internal/provider/utils.go

@@ -0,0 +1,25 @@
+package provider
+
+import (
+	"regexp"
+	"strings"
+)
+
+var matchAllCap = regexp.MustCompile("([a-z0-9])([A-Z])")
+
+// Small utility functions to help convert the usual camel case used in HTTP
+// to the names we give fields in Terraform. This is just to remove some cognitive overhead
+// for Terraform users.
+func toSnakeCase(s string) string {
+	snake := matchAllCap.ReplaceAllString(s, "${1}_${2}")
+	return snake
+}
+
+// AmbarApiErrorToTerraformErrorString Extracts out just the error portion of the JSON body of the http response.
+// We then use the other util functions to clean it up and correct the naming to be correct as fields would appear
+// in Terraform template files.
+func AmbarApiErrorToTerraformErrorString(apiString string) string {
+	slicedString := strings.SplitAfter(apiString, "\":")
+	errorContent := strings.Trim(slicedString[len(slicedString)-1], "\"{}")
+	return toSnakeCase(errorContent)
+}