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解决截图失败的问题

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xiongziliang 2020-09-26 10:07:22 +08:00
parent 4f42f508d5
commit 2cf66594e8
1 changed files with 31 additions and 21 deletions
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46
server/WebApi.cpp
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@ -940,50 +940,60 @@ void installWebApi() {
CHECK_ARGS("url", "timeout_sec", "expire_sec");
GET_CONFIG(string, snap_root, API::kSnapRoot);
bool have_old_snap = false, res_old_snap = false;
int expire_sec = allArgs["expire_sec"];
auto scan_path = File::absolutePath(MD5(allArgs["url"]).hexdigest(), snap_root) + "/";
string snap_path;
string new_snap = StrPrinter << scan_path << time(NULL) << ".jpeg";
File::scanDir(scan_path, [&](const string &path, bool isDir) {
if (isDir) {
//忽略文件夹
if (isDir || !end_with(path, ".jpeg")) {
//忽略文件夹或其他类型的文件
return true;
}
//找到截图
auto tm = FindField(path.data() + scan_path.size(), nullptr, ".jpeg");
if (atoll(tm.data()) + expire_sec < time(NULL)) {
//截图已经过期,删除之，后面重新生成
File::delete_file(path.data());
//截图已经过期，改名，以便再次请求时，可以返回老截图
rename(path.data(), new_snap.data());
have_old_snap = true;
return true;
}
//截图未过期,中断遍历，返回上次生成的截图
snap_path = path;
//截图存在，且未过期，那么返回之
res_old_snap = true;
responseSnap(path, headerIn, invoker);
//中断遍历
return false;
});
if(!snap_path.empty()){
responseSnap(snap_path, headerIn, invoker);
if (res_old_snap) {
//已经回复了旧的截图
return;
}
//无截图或者截图已经过期
snap_path = StrPrinter << scan_path << time(NULL) << ".jpeg";
//生成一个空文件，目的是顺便创建文件夹路径，
//同时防止在FFmpeg生成截图途中不停的尝试调用该api启动FFmpeg生成相同的截图
auto file = File::create_file(snap_path.data(), "wb");
if (!have_old_snap) {
//无过期截图，生成一个空文件，目的是顺便创建文件夹路径
//同时防止在FFmpeg生成截图途中不停的尝试调用该api多次启动FFmpeg进程
auto file = File::create_file(new_snap.data(), "wb");
if (file) {
fclose(file);
}
}
//启动FFmpeg进程，开始截图
FFmpegSnap::makeSnap(allArgs["url"],snap_path,allArgs["timeout_sec"],[invoker,headerIn,snap_path](bool success){
//启动FFmpeg进程，开始截图，生成临时文件，截图成功后替换为正式文件
auto new_snap_tmp = new_snap + ".tmp";
FFmpegSnap::makeSnap(allArgs["url"], new_snap_tmp, allArgs["timeout_sec"], [invoker, headerIn, new_snap, new_snap_tmp](bool success) {
if (!success) {
//生成截图失败，可能残留空文件
File::delete_file(snap_path.data());
File::delete_file(new_snap_tmp.data());
} else {
//临时文件改成正式文件
File::delete_file(new_snap.data());
rename(new_snap_tmp.data(), new_snap.data());
}
responseSnap(snap_path, headerIn, invoker);
responseSnap(new_snap, headerIn, invoker);
});
});