additional fixes for #79: chunked http log

use correct sqlite column name
remove redundant code, tidy implementation

src/laminar.cpp

@@ -126,7 +126,7 @@ uint Laminar::latestRun(std::string job) {
     auto it = activeJobs.byJobName().equal_range(job);
     if(it.first == it.second) {
         uint result = 0;
-        db->stmt("SELECT MAX(buildNum) FROM builds WHERE name = ?")
+        db->stmt("SELECT MAX(number) FROM builds WHERE name = ?")
                 .bind(job)
                 .fetch<uint>([&](uint x){
             result = x;
@@ -145,8 +145,7 @@ bool Laminar::handleLogRequest(std::string name, uint num, std::string& output,
         complete = false;
         return true;
     } else { // it must be finished, fetch it from the database
-        const char* stmt = num == 0 ? "SELECT output, outputLen FROM builds WHERE name = ? ORDER BY number DESC LIMIT 1" : "SELECT output, outputLen FROM builds WHERE name = ? AND number = ?" ;
+        db->stmt("SELECT output, outputLen FROM builds WHERE name = ? AND number = ?")
-        db->stmt(stmt)
                 .bind(name, num)
                 .fetch<str,int>([&](str maybeZipped, unsigned long sz) {
             str log(sz,'\0');

src/server.cpp

@@ -356,12 +356,13 @@ private:
                 name = path.slice(0, *sep).begin();
                 kj::StringPtr tail = path.slice(*sep+1);
                 num = static_cast<uint>(atoi(tail.begin()));
-                if(num > 0 || tail == "latest") {
                 name.erase(*sep);
+                if(tail == "latest")
+                    num = laminar.latestRun(name);
+                if(num > 0)
                     return true;
             }
         }
-        }
         return false;
     }
 
@@ -407,8 +408,6 @@ private:
             } else if(parseLogEndpoint(url, name, num)) {
                 kj::Own<HttpChunkedClient> cc = kj::heap<HttpChunkedClient>(laminar);
                 cc->scope.job = name;
-                if(num == 0)
-                    num = laminar.latestRun(name);
                 cc->scope.num = num;
                 bool complete;
                 std::string output;