util: dedup code in callers of serviceFlagToStr()

Introduce `serviceFlagsToStr()` which hides the internals of the bitmask
and simplifies callers of `serviceFlagToStr()`.

Author: vasild

src/protocol.cpp

@@ -195,7 +195,12 @@ const std::vector<std::string> &getAllNetMessageTypes()
     return allNetMessageTypesVec;
 }
 
-std::string serviceFlagToStr(size_t bit)
+/**
+ * Convert a service flag (NODE_*) to a human readable string.
+ * It supports unknown service flags which will be returned as "UNKNOWN[...]".
+ * @param[in] bit the service flag is calculated as (1 << bit)
+ */
+static std::string serviceFlagToStr(size_t bit)
 {
     const uint64_t service_flag = 1ULL << bit;
     switch ((ServiceFlags)service_flag) {
@@ -219,3 +224,16 @@ std::string serviceFlagToStr(size_t bit)
     stream << "]";
     return stream.str();
 }
+
+std::vector<std::string> serviceFlagsToStr(uint64_t flags)
+{
+    std::vector<std::string> str_flags;
+
+    for (size_t i = 0; i < sizeof(flags) * 8; ++i) {
+        if (flags & (1ULL << i)) {
+            str_flags.emplace_back(serviceFlagToStr(i));
+        }
+    }
+
+    return str_flags;
+}

src/protocol.h

@@ -289,11 +289,11 @@ enum ServiceFlags : uint64_t {
 };
 
 /**
- * Convert a service flag (NODE_*) to a human readable string.
+ * Convert service flags (a bitmask of NODE_*) to human readable strings.
  * It supports unknown service flags which will be returned as "UNKNOWN[...]".
- * @param[in] bit the service flag is calculated as (1 << bit)
+ * @param[in] flags multiple NODE_* bitwise-OR-ed together
  */
-std::string serviceFlagToStr(size_t bit);
+std::vector<std::string> serviceFlagsToStr(uint64_t flags);
 
 /**
  * Gets the set of service flags which are "desirable" for a given peer.

src/qt/guiutil.cpp

@@ -755,12 +755,8 @@ QString formatServicesStr(quint64 mask)
 {
     QStringList strList;
 
-    for (int i = 0; i < 64; i++) {
-        uint64_t check = 1ull << i;
-        if (mask & check)
-        {
-            strList.append(QString::fromStdString(serviceFlagToStr(i)));
-        }
+    for (const auto& flag : serviceFlagsToStr(mask)) {
+        strList.append(QString::fromStdString(flag));
     }
 
     if (strList.size())

src/rpc/util.cpp

@@ -841,14 +841,10 @@ std::vector<CScript> EvalDescriptorStringOrObject(const UniValue& scanobject, Fl
 
 UniValue GetServicesNames(ServiceFlags services)
 {
-    const uint64_t services_n = services;
     UniValue servicesNames(UniValue::VARR);
 
-    for (int i = 0; i < 64; ++i) {
-        const uint64_t mask = 1ull << i;
-        if (services_n & mask) {
-            servicesNames.push_back(serviceFlagToStr(i));
-        }
+    for (const auto& flag : serviceFlagsToStr(services)) {
+        servicesNames.push_back(flag);
     }
 
     return servicesNames;