chore: add GetBusFromCmd() CLI helper

Author: bryanchriswhite

app/client/cli/helpers/common.go

@@ -25,9 +25,9 @@ var (
 
 // fetchPeerstore retrieves the providers from the CLI context and uses them to retrieve the address book for the current height
 func FetchPeerstore(cmd *cobra.Command) (types.Peerstore, error) {
-	bus, ok := GetValueFromCLIContext[modules.Bus](cmd, BusCLICtxKey)
-	if !ok || bus == nil {
-		return nil, errors.New("retrieving bus from CLI context")
+	bus, err := GetBusFromCmd(cmd)
+	if err != nil {
+		return nil, err
 	}
 	// TECHDEBT(#810, #811): use `bus.GetPeerstoreProvider()` after peerstore provider
 	// is retrievable as a proper submodule

app/client/cli/helpers/context.go

@@ -2,12 +2,17 @@ package helpers
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/spf13/cobra"
+
+	"github.com/pokt-network/pocket/shared/modules"
 )
 
 const BusCLICtxKey cliContextKey = "bus"
 
+var ErrCxtFromBus = fmt.Errorf("could not get context from bus")
+
 // NOTE: this is required by the linter, otherwise a simple string constant would have been enough
 type cliContextKey string
 
@@ -19,3 +24,12 @@ func GetValueFromCLIContext[T any](cmd *cobra.Command, key cliContextKey) (T, bo
 	value, ok := cmd.Context().Value(key).(T)
 	return value, ok
 }
+
+func GetBusFromCmd(cmd *cobra.Command) (modules.Bus, error) {
+	bus, ok := GetValueFromCLIContext[modules.Bus](cmd, BusCLICtxKey)
+	if !ok {
+		return nil, ErrCxtFromBus
+	}
+
+	return bus, nil
+}