refactor: use maps.Copy to simplify the code

commit/merkleroot/rmn/controller_test.go

@@ -6,6 +6,7 @@ import (
 	"crypto/sha256"
 	"errors"
 	"fmt"
+	"maps"
 	"sort"
 	"strconv"
 	"strings"
@@ -1053,9 +1054,7 @@ func (m *mockPeerClient) getReceivedRequests() map[rmntypes.NodeID][]*rmnpb.Requ
 	cp := make(map[rmntypes.NodeID][]*rmnpb.Request)
 	m.mu.RLock()
 	defer m.mu.RUnlock()
-	for k, v := range m.receivedRequests {
-		cp[k] = v
-	}
+	maps.Copy(cp, m.receivedRequests)
 	return cp
 }
 

commit/merkleroot/transmission_checks_test.go

@@ -1,6 +1,7 @@
 package merkleroot
 
 import (
+	"maps"
 	"testing"
 
 	"github.com/stretchr/testify/mock"
@@ -28,9 +29,7 @@ func TestValidateRootBlessings(t *testing.T) {
 	copyConfigWithOverride := func(chain cciptypes.ChainSelector,
 		override reader2.StaticSourceChainConfig) map[cciptypes.ChainSelector]reader2.StaticSourceChainConfig {
 		config := make(map[cciptypes.ChainSelector]reader2.StaticSourceChainConfig)
-		for k, v := range sourceChainConfig {
-			config[k] = v
-		}
+		maps.Copy(config, sourceChainConfig)
 		config[chain] = override
 		return config
 	}

pkg/addressbook/book.go

@@ -2,6 +2,7 @@ package addressbook
 
 import (
 	"errors"
+	"maps"
 	"sync"
 
 	"github.com/smartcontractkit/chainlink-common/pkg/types/ccipocr3"
@@ -73,9 +74,7 @@ func (b *Book) InsertOrUpdate(addresses ContractAddresses) error {
 		}
 
 		// if contract exists, set or replace any existing address for each chain
-		for chain, addr := range chains {
-			b.mem[name][chain] = addr
-		}
+		maps.Copy(b.mem[name], chains)
 	}
 
 	return nil

pkg/ocrtypecodec/v1/translate.go

@@ -1,6 +1,7 @@
 package v1
 
 import (
+	"maps"
 	"math/big"
 
 	"google.golang.org/protobuf/types/known/timestamppb"
@@ -854,9 +855,7 @@ func (t *protoTranslator) nonceObservationsToProto(
 
 	for chainSel, nonceMap := range observations {
 		addrToNonce := make(map[string]uint64, len(nonceMap))
-		for addr, nonce := range nonceMap {
-			addrToNonce[addr] = nonce
-		}
+		maps.Copy(addrToNonce, nonceMap)
 		nonceObservations[uint64(chainSel)] = &ocrtypecodecpb.StringAddrToNonce{Nonces: addrToNonce}
 	}
 
@@ -873,9 +872,7 @@ func (t *protoTranslator) nonceObservationsFromProto(
 
 	for chainSel, nonceMap := range pbObservations {
 		innerMap := make(map[string]uint64, len(nonceMap.Nonces))
-		for addr, nonce := range nonceMap.Nonces {
-			innerMap[addr] = nonce
-		}
+		maps.Copy(innerMap, nonceMap.Nonces)
 		nonces[cciptypes.ChainSelector(chainSel)] = innerMap
 	}
 

pkg/reader/config_poller.go

@@ -3,6 +3,7 @@ package reader
 import (
 	"context"
 	"fmt"
+	"maps"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -591,9 +592,7 @@ func (c *configPoller) GetOfframpSourceChainConfigs(
 	}
 
 	// Merge the new configs with existing cached results
-	for chain, config := range newCachedConfigs {
-		cachedSourceConfigs[chain] = config
-	}
+	maps.Copy(cachedSourceConfigs, newCachedConfigs)
 
 	return cachedSourceConfigs, nil
 }

pkg/reader/config_poller_v2_test.go

@@ -3,6 +3,7 @@ package reader
 import (
 	"context"
 	"errors"
+	"maps"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -314,9 +315,7 @@ func TestConfigPollerV2_BatchRefreshChainAndSourceConfigs_Error(t *testing.T) {
 	cache.sourceChainMu.RLock()
 	initialSourceRefreshTime := cache.sourceChainRefresh
 	initialSourceConfigData := make(map[cciptypes.ChainSelector]StaticSourceChainConfig)
-	for k, v := range cache.staticSourceChainConfigs {
-		initialSourceConfigData[k] = v
-	}
+	maps.Copy(initialSourceConfigData, cache.staticSourceChainConfigs)
 	cache.sourceChainMu.RUnlock()
 
 	// Verify cache was populated

pkg/reader/usdc_reader.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/binary"
 	"fmt"
+	"maps"
 
 	sel "github.com/smartcontractkit/chain-selectors"
 
@@ -231,9 +232,7 @@ func AllAvailableDomains() map[uint64]uint32 {
 	}
 
 	destDomains := make(map[uint64]uint32)
-	for k, v := range CCTPDestDomains {
-		destDomains[k] = v
-	}
+	maps.Copy(destDomains, CCTPDestDomains)
 
 	for i, chainID := range chainIDs {
 		chainSelector, _ := sel.SelectorFromChainId(chainID)