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functions.R
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functions.R
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getTimeline <- function(filename, n=3200, oauth_folder="~/credentials", screen_name=NULL,
id=NULL, since_id=-1, trim_user="false"){
require(rjson); require(ROAuth)
## create list of credentials
creds <- list.files(oauth_folder, full.names=T)
## open a random credential
cr <- sample(creds, 1)
cat(cr, "\n")
load(cr)
## while rate limit is 0, open a new one
limit <- getLimitTimeline(my_oauth)
cat(limit, " hits left\n")
while (limit==0){
cr <- sample(creds, 1)
cat(cr, "\n")
load(cr)
Sys.sleep(1)
# sleep for 5 minutes if limit rate is less than 100
rate.limit <- getLimitRate(my_oauth)
if (rate.limit<100){
Sys.sleep(300)
}
limit <- getLimitTimeline(my_oauth)
cat(limit, " hits left\n")
}
## url to call
url <- "https://api.twitter.com/1.1/statuses/user_timeline.json"
## first API call
if (!is.null(screen_name)){
params <- list(screen_name = screen_name, count=200, trim_user=trim_user)
}
if (!is.null(id)){
params <- list(id=id, count=200, trim_user=trim_user)
}
url.data <- my_oauth$OAuthRequest(URL=url, params=params, method="GET",
cainfo=system.file("CurlSSL", "cacert.pem", package = "RCurl"))
Sys.sleep(.5)
## one API call less
limit <- limit - 1
## changing oauth token if we hit the limit
cat(limit, " hits left\n")
while (limit==0){
cr <- sample(creds, 1)
cat(cr, "\n")
load(cr)
Sys.sleep(1)
# sleep for 5 minutes if limit rate is less than 100
rate.limit <- getLimitRate(my_oauth)
if (rate.limit<100){
Sys.sleep(300)
}
limit <- getLimitTimeline(my_oauth)
cat(limit, " hits left\n")
}
## trying to parse JSON data
#json.data <- fromJSON(url.data, unexpected.escape = "skip")
json.data <- RJSONIO::fromJSON(url.data)
if (length(json.data$error)!=0){
cat(url.data)
stop("error! Last cursor: ", cursor)
}
## writing to disk
conn <- file(filename, "a")
invisible(lapply(json.data, function(x) writeLines(rjson::toJSON(x), con=conn)))
close(conn)
## max_id
tweets <- length(json.data)
max_id <- json.data[[tweets]]$id_str
cat(tweets, "tweets. Max id: ", max_id, "\n")
max_id_old <- "none"
while (tweets < n & max_id != max_id_old &
as.numeric(max_id) > as.numeric(since_id)){
max_id_old <- max_id
if (!is.null(screen_name)){
params <- list(screen_name = screen_name, count=200, max_id=max_id,
trim_user=trim_user)
}
if (!is.null(id)){
params <- list(id=id, count=200, max_id=max_id, trim_user=trim_user)
}
url.data <- my_oauth$OAuthRequest(URL=url, params=params, method="GET",
cainfo=system.file("CurlSSL", "cacert.pem", package = "RCurl"))
Sys.sleep(1)
## one API call less
limit <- limit - 1
## changing oauth token if we hit the limit
cat(limit, " hits left\n")
while (limit==0){
cr <- sample(creds, 1)
cat(cr, "\n")
load(cr)
Sys.sleep(1)
# sleep for 5 minutes if limit rate is less than 100
rate.limit <- getLimitRate(my_oauth)
if (rate.limit<100){
Sys.sleep(300)
}
limit <- getLimitTimeline(my_oauth)
cat(limit, " hits left\n")
}
## trying to parse JSON data
#json.data <- fromJSON(url.data, unexpected.escape = "skip")
json.data <- RJSONIO::fromJSON(url.data)
if (length(json.data$error)!=0){
cat(url.data)
stop("error! Last cursor: ", cursor)
}
## writing to disk
conn <- file(filename, "a")
invisible(lapply(json.data, function(x) writeLines(toJSON(x), con=conn)))
close(conn)
## max_id
tweets <- tweets + length(json.data)
max_id <- json.data[[length(json.data)]]$id_str
cat(tweets, "tweets. Max id: ", max_id, "\n")
}
}
getLimitRate <- function(my_oauth){
require(rjson); require(ROAuth)
url <- "https://api.twitter.com/1.1/application/rate_limit_status.json"
params <- list(resources = "followers,application")
response <- my_oauth$OAuthRequest(URL=url, params=params, method="GET",
cainfo=system.file("CurlSSL", "cacert.pem", package = "RCurl"))
return(unlist(fromJSON(response)$resources$application$`/application/rate_limit_status`[['remaining']]))
}
getLimitTimeline <- function(my_oauth){
require(rjson); require(ROAuth)
url <- "https://api.twitter.com/1.1/application/rate_limit_status.json"
params <- list(resources = "statuses,application")
response <- my_oauth$OAuthRequest(URL=url, params=params, method="GET",
cainfo=system.file("CurlSSL", "cacert.pem", package = "RCurl"))
return(unlist(fromJSON(response)$resources$statuses$`/statuses/user_timeline`[['remaining']]))
}