Merge #20589: log: Clarify that failure to read/write fee_estimates.dat is non-fatal

fa0d835 log: Clarify that failure to read fee_estimates.dat is non-fatal (MarcoFalke)
faefa5d log: Clarify that failure to write fee_estimates.dat is non-fatal (MarcoFalke)

Pull request description:

  two minor logging fixups

ACKs for top commit:
  practicalswift:
    ACK fa0d835: patch looks correct
  laanwj:
    Code review ACK fa0d835

Tree-SHA512: d1e7e595d3b4a5e497ee7ab70f3be5783dafec2726ef8e012db836c15e8e622022859a4472d6b516fe19d327737b25fdfb509cd9aeb022ca847b13c54e55800a

Author: laanwj

src/policy/fees.cpp

@@ -6,6 +6,8 @@
 #include <policy/fees.h>
 
 #include <clientversion.h>
+#include <fs.h>
+#include <logging.h>
 #include <streams.h>
 #include <txmempool.h>
 #include <util/system.h>
@@ -872,7 +874,7 @@ void CBlockPolicyEstimator::Flush() {
     fs::path est_filepath = GetDataDir() / FEE_ESTIMATES_FILENAME;
     CAutoFile est_file(fsbridge::fopen(est_filepath, "wb"), SER_DISK, CLIENT_VERSION);
     if (est_file.IsNull() || !Write(est_file)) {
-        LogPrintf("Failed to write fee estimates to %s\n", est_filepath.string());
+        LogPrintf("Failed to write fee estimates to %s. Continue anyway.\n", est_filepath.string());
     }
 }
 
@@ -907,8 +909,9 @@ bool CBlockPolicyEstimator::Read(CAutoFile& filein)
         LOCK(m_cs_fee_estimator);
         int nVersionRequired, nVersionThatWrote;
         filein >> nVersionRequired >> nVersionThatWrote;
-        if (nVersionRequired > CLIENT_VERSION)
-            return error("CBlockPolicyEstimator::Read(): up-version (%d) fee estimate file", nVersionRequired);
+        if (nVersionRequired > CLIENT_VERSION) {
+            throw std::runtime_error(strprintf("up-version (%d) fee estimate file", nVersionRequired));
+        }
 
         // Read fee estimates file into temporary variables so existing data
         // structures aren't corrupted if there is an exception.
@@ -926,8 +929,9 @@ bool CBlockPolicyEstimator::Read(CAutoFile& filein)
             std::vector<double> fileBuckets;
             filein >> fileBuckets;
             size_t numBuckets = fileBuckets.size();
-            if (numBuckets <= 1 || numBuckets > 1000)
+            if (numBuckets <= 1 || numBuckets > 1000) {
                 throw std::runtime_error("Corrupt estimates file. Must have between 2 and 1000 feerate buckets");
+            }
 
             std::unique_ptr<TxConfirmStats> fileFeeStats(new TxConfirmStats(buckets, bucketMap, MED_BLOCK_PERIODS, MED_DECAY, MED_SCALE));
             std::unique_ptr<TxConfirmStats> fileShortStats(new TxConfirmStats(buckets, bucketMap, SHORT_BLOCK_PERIODS, SHORT_DECAY, SHORT_SCALE));