wrap redis client errors to aid debugging

Signed-off-by: Bob Callaway <bcallaway@google.com>

pkg/api/index.go

@@ -19,6 +19,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
+	"fmt"
 	"net/http"
 	"strings"
 
@@ -47,7 +48,7 @@ func SearchIndexHandler(params index.SearchIndexParams) middleware.Responder {
 		sha := util.PrefixSHA(params.Query.Hash)
 		var resultUUIDs []string
 		if err := redisClient.Do(httpReqCtx, radix.Cmd(&resultUUIDs, "LRANGE", strings.ToLower(sha), "0", "-1")); err != nil {
-			return handleRekorAPIError(params, http.StatusInternalServerError, err, redisUnexpectedResult)
+			return handleRekorAPIError(params, http.StatusInternalServerError, fmt.Errorf("redis client: %w", err), redisUnexpectedResult)
 		}
 		result.Add(resultUUIDs)
 	}
@@ -74,14 +75,14 @@ func SearchIndexHandler(params index.SearchIndexParams) middleware.Responder {
 		keyHash := sha256.Sum256(canonicalKey)
 		var resultUUIDs []string
 		if err := redisClient.Do(httpReqCtx, radix.Cmd(&resultUUIDs, "LRANGE", strings.ToLower(hex.EncodeToString(keyHash[:])), "0", "-1")); err != nil {
-			return handleRekorAPIError(params, http.StatusInternalServerError, err, redisUnexpectedResult)
+			return handleRekorAPIError(params, http.StatusInternalServerError, fmt.Errorf("redis client: %w", err), redisUnexpectedResult)
 		}
 		result.Add(resultUUIDs)
 	}
 	if params.Query.Email != "" {
 		var resultUUIDs []string
 		if err := redisClient.Do(httpReqCtx, radix.Cmd(&resultUUIDs, "LRANGE", strings.ToLower(params.Query.Email.String()), "0", "-1")); err != nil {
-			return handleRekorAPIError(params, http.StatusInternalServerError, err, redisUnexpectedResult)
+			return handleRekorAPIError(params, http.StatusInternalServerError, fmt.Errorf("redis client: %w", err), redisUnexpectedResult)
 		}
 		result.Add(resultUUIDs)
 	}
@@ -100,7 +101,10 @@ func SearchIndexNotImplementedHandler(params index.SearchIndexParams) middleware
 }
 
 func addToIndex(ctx context.Context, key, value string) error {
-	return redisClient.Do(ctx, radix.Cmd(nil, "LPUSH", key, value))
+	if err := redisClient.Do(ctx, radix.Cmd(nil, "LPUSH", key, value)); err != nil {
+		return fmt.Errorf("redis client: %w", err)
+	}
+	return nil
 }
 
 func storeAttestation(ctx context.Context, uuid string, attestation []byte) error {