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Changed!: StreamGobbler needs to be passed log level parameter
When `Logger.CURRENT_LOG_LEVEL` set by user is `Logger.LOG_VERBOSE`, then background (not foreground sessions) command output was being logged to logcat, however, if command outputted too much data to logcat, then logcat clients like in Android Studio would crash. Also if a logcat dump is being taken inside termux, then duplicate lines would occur, first one due to of original entry, and second one due to StreamGobbler logging output at verbose level for logcat command.
This would be a concern for plugins as well like `RUN_COMMAND` intent or Termux:Tasker, etc if they ran commands with lot of data and user had set log level to verbose.
For plugins, TermuxService now supports `com.termux.execute.background_custom_log_level` `String` extra for custom log level. Termux:Tasker, etc will have to be updated with support. For `RUN_COMMAND` intent, the `com.termux.RUN_COMMAND_BACKGROUND_CUSTOM_LOG_LEVEL` `String` extra is now provided to set custom log level for only the command output. Check `TermuxConstants`.
So one can pass a custom log level that is `>=` to the log level set it termux settings where (OFF=0, NORMAL=1, DEBUG=2, VERBOSE=3). If you pass `0`, it will completely disable logging. If you pass `1`, logging will only be enabled if log level in termux settings is `NORMAL` or higher. If custom log level is not passed, then old behaviour will remain and log level in termux settings must be `VERBOSE` or higher for logging to be enabled. Note that the log entries will still be logged with priority `Log.VERBOSE` regardless of log level, i.e `logcat` will have `V/`.
The entries logcat component has now changed from `StreamGobbler` to `TermuxCommand`. For output at `stdout`, the entry format is `[<pid>-stdout] ...` and for the output at `stderr`, the entry format is `[<pid>-stderr] ...`. The `<pid>` will be process id as an integer that was started by termux. For example: `V/TermuxCommand: [66666-stdout] ...`.
While doing this I realize that instead of using `am` command to send messages back to tasker, you can use tasker `Logcat Entry` profile event to listen to messages from termux at both `stdout` and `stderr`. This might be faster than `am` command intent systems or at least possibly more convenient in some use cases.
So setup a profile with the `Component` value set to `TermuxCommand` and `Filter` value set to `-E 'TermuxCommand: \[[0-9]+-((stdout)|(stderr))\] message_tag: .*'` and enable the `Grep Filter` toggle so that entry matching is done in native code. Check https://github.com/joaomgcd/TaskerDocumentation/blob/master/en/help/logcat%20info.md for details. Also enable `Enforce Task Order` in profile settings and set collision handling to `Run Both Together` so that if two or more entries are sent quickly, entry task is run for all. Tasker currently (v5.13.16) is not maintaining order of entry tasks despite the setting.
Then you can send an intent from tasker via `Run Shell` action with `root` (since `am` command won't work without it on android >=8) or normally in termux from a script, you should be able to receive the entries as `@lc_text` in entry task of tasker `Logcat Entry` profile. The following just passes two `echo` commands to `bash` as a script via `stdin`. If you don't have root, then you can call a wrapper script with `TermuxCommand` function in `Tasker Function` action that sends another `RUN_COMMAND` intent with termux provide `am` command which will work without root.
```
am startservice --user 0 -n com.termux/com.termux.app.RunCommandService -a com.termux.RUN_COMMAND --es com.termux.RUN_COMMAND_PATH '/data/data/com.termux/files/usr/bin/bash' --es com.termux.RUN_COMMAND_STDIN 'echo "message_tag: Sending message from tasker to termux"' --ez com.termux.RUN_COMMAND_BACKGROUND true --es com.termux.RUN_COMMAND_BACKGROUND_CUSTOM_LOG_LEVEL '1'
```
// keep reading the InputStream until it ends (or an error occurs)
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// optionally pausing when a command is executed that consumes the InputStream itself
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try {
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Stringline;
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while ((line = reader.readLine()) != null) {
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-
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if (currentLogLevel >= logLevelVerbose)
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Logger.logVerbose(LOG_TAG, String.format(Locale.ENGLISH, "[%s] %s", shell, line)); // This will get truncated by LOGGER_ENTRY_MAX_LEN, likely 4KB
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if (customLogLevel >= currentLogLevel)
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Logger.logVerboseForce(defaultLogTag + "Command", String.format(Locale.ENGLISH, "[%s] %s", shell, line)); // This will get truncated by LOGGER_ENTRY_MAX_LEN, likely 4KB
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if (stringWriter != null) stringWriter.append(line).append("\n");
/** Intent {@code String} extra for custom log level for background commands defined by {@link com.termux.shared.logger.Logger} for the TERMUX_SERVICE.ACTION_SERVICE_EXECUTE intent */
/** Intent {@code boolean} extra for whether to run command in background or foreground terminal session for the RUN_COMMAND_SERVICE.ACTION_RUN_COMMAND intent */
/** Intent {@code String} extra for custom log level for background commands defined by {@link com.termux.shared.logger.Logger} for the RUN_COMMAND_SERVICE.ACTION_RUN_COMMAND intent */
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