exchange.py

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#! /usr/bin/python
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# Revision $Id: topics.py 11753 2010-10-25 06:23:19Z kwc $

# author: pratkanis

"""
Implements exchange part of app_manager, which handles listing of
avialable and removable applications.
"""

import subprocess
import os
import sys
import yaml
import rospy
from std_msgs.msg import String
from .msg import ExchangeApp, Icon

class Exchange():
    def __init__(self, url, directory, on_error = lambda(x): None):
        self._url = url
        self._directory = directory
        self._on_error = on_error
        self._installed_apps = []
        self._available_apps = []
        self._debs = {}

        self._exchange_local = os.path.join(self._directory, "exchange.yaml")
        d = os.path.join(self._directory, "installed")
        if (not os.path.exists(d)):
            os.mkdir(d)
        self._exchange_file = os.path.join(d, "app_exchange.installed")
        print "Directory:", self._directory
        print "Local path:", self._exchange_local
        print "Local file:", self._exchange_file
        print subprocess.Popen(["whoami"], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()

    def get_installed_version(self, deb):
        data = subprocess.Popen(["dpkg", "-l", deb], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        val = (data[0] or '').strip()
        for i in val.split('\n'):
            if (i.find(deb) > 0 and i.find("ii") == 0):
                return [s for s in i.strip().split(" ") if s][2]
        self._on_error("Failed to get installed version: " + str(data))
        return "FAILED"

    def get_available_version(self, deb):
        data = subprocess.Popen(["apt-cache", "showpkg", deb], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        val = (data[0] or '').strip()
        nearing = False
        for i in val.split('\n'):
            if (nearing):
                return i.strip().split(" ")[0].strip()
            if (i.strip() == "Versions:"):
                nearing = True
        self._on_error("Failed to get available version: " + str(data))
        return "FAILED"

    def is_installed(self, deb):
        data = subprocess.Popen(["dpkg", "-l", deb], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        val = (data[0] or '').strip()
        for i in val.split("\n"):
            if (i.find(deb) > 0):
                return (i.find("ii") == 0)
        self._on_error("Error getting installed packages: " + str(data))
        return False

    def get_installed_apps(self):
        return self._installed_apps
    
    def get_available_apps(self):
        return self._available_apps

    def get_app_details(self, name):
        local_path = os.path.join(self._directory, name)
        if (not os.path.exists(local_path)):
            os.makedirs(local_path)
        data = subprocess.Popen(["wget", "-O", os.path.join(local_path, "app.yaml"), (self._url.strip('/') + "/" + name + ".yaml")], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        val = (data[0] or '').strip()        
        print val
        try:
            data = yaml.load(open(os.path.join(local_path, "app.yaml")))
            icon_url = data["icon_url"]
            icon_format = data["icon_format"]
            val = (subprocess.Popen(["wget", "-O", os.path.join(local_path, "icon" + icon_format), icon_url], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0] or '').strip()     
            print val
        except:
            print "No icon"
        self.update_local()
        for i in self._available_apps:
            if (i.name == name):
                return i
        for i in self._installed_apps:
            if (i.name == name):
                return i
        self._on_error("Problem getting app details: " + str(data))
        return None

    def install_app(self, app):
        deb = False
        for i in self._available_apps:
            if (i.name == app):
                if (deb):
                    return False #Somehow a dupe
                deb = self._debs[i.name]
        for i in self._installed_apps:
            if (i.name == app):
                if (deb):
                    return False #Somehow a dupe                                                                                                                                                                                              
                deb = self._debs[i.name]
        if (deb == False):
            self._on_error("No debian found for install")
            return False
        print "install app"
        p = subprocess.Popen(["sudo", "rosget", "install", deb], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        #data = p.communicate()
        #data = "test string"
        pub = rospy.Publisher('install_status', String)
        l1 = []
        for line in iter(p.stdout.readline, ''):
            if line.rstrip() != '':
                pub.publish(line.rstrip())
                l1.append(line)
            else:
                break
        l2 = []
        for line in iter(p.stderr.readline, ''):
            if line.rstrip() != '':
                pub.publish(line.rstrip())
                l2.append(line)
            else:
                break

        data = (''.join(l1), ''.join(l2))
        val = (data[0] or '').strip()
        print val
        self.update_local()
        for i in self._installed_apps:
            if (i.name == app):
                return True        
        self._on_error("Invalid return for install: " + str(data))
        return False
    
    def uninstall_app(self, app):
        deb = False
        for i in self._installed_apps:
            if (i.name == app):
                if (deb):
                    return False #Somehow a dupe 
                deb = self._debs[i.name]
        if (deb == False):
            self._on_error("No debian found for uninstall")
            return False
        print "uninstall app"
        data = subprocess.Popen(["sudo", "rosget", "remove", deb], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
        val = (data[0] or '').strip()
        self.update_local()
        for i in self._available_apps:
            if (i.name == app):
                return True
        self._on_error("Invalid return for uninstall: " + str(data))
        return False
    
    def update(self):
        #Call server
        val = (subprocess.Popen(["wget", "-O", self._exchange_local, self._url + "/applications.yaml"], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0] or '').strip()
        if (val != "" or not os.path.exists(self._exchange_local)):
            print sys.stderr >> val
            print sys.stderr >> "Wget failed"
            return False
               
        p = subprocess.Popen(["sudo", "rosget", "update"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        data = p.communicate()
        val = (data[0] or '').strip()
        if (p.returncode != 0):
            self._on_error("Invalid return of update: " + str(data))
        self.update_local()
        if (p.returncode != 0):
            return False
        return True

    def update_local(self):
        installed_apps = []
        file_apps = []
        available_apps = []
        try:
            exchange_data = yaml.load(open(self._exchange_local))
        except:
            return
        if (not exchange_data):
            return
        for app in exchange_data['apps']:
            appc = ExchangeApp()
            appc.name = app['app']
            appc.display_name = app['display']
            deb = app['debian']
            self._debs[app['app']] = deb
            appc.latest_version = self.get_available_version(deb)
            appc.hidden = False
            try:
                if(app['hidden']):
                    appc.hidden = True
            except:
                pass

            local_path = os.path.join(self._directory, app['app'])
            if (os.path.exists(local_path)):
                format = ""
                if (os.path.exists(os.path.join(local_path, "app.yaml"))):
                    print local_path
                    data = yaml.load(open(os.path.join(local_path, "app.yaml")))
                    try:
                        appc.description = data['description']
                    except:
                        if (appc.hidden):
                            appc.description = "Descriptionless hidden app"
                        else:
                            appc.description = "No description set, likely an error in the yaml file"
                    try:
                        format = data['icon_format']
                    except:
                        pass
                if (os.path.exists(os.path.join(local_path, "icon" + format)) and format != ""):
                    icon = Icon()
                    icon.format = format.strip(".")
                    if (icon.format == "jpg"): icon.format = "jpeg"
                    icon.data = open(os.path.join(local_path, "icon" + format), "rb").read()
                    appc.icon = icon
            if (self.is_installed(deb)):
                appc.version = self.get_installed_version(deb)
                installed_apps.append(appc)
                file_apps.append(app) #Should remove debian tag?
            else:
                available_apps.append(appc)
        
        f = open(self._exchange_file, "w")
        yaml.dump({"apps": file_apps}, f)
        f.close()
        self._installed_apps = installed_apps
        self._available_apps = available_apps