Struct Reader

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pub struct Reader<S: AsRef<[u8]>> {
    pub metadata: Metadata,
    /* private fields */
}
Expand description

A reader for the MaxMind DB format. The lifetime 'data is tied to the lifetime of the underlying buffer holding the contents of the database file.

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§metadata: Metadata

Implementations§

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impl Reader<Vec<u8>>

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pub fn open_readfile<P: AsRef<Path>>( database: P, ) -> Result<Reader<Vec<u8>>, MaxMindDbError>

Open a MaxMind DB database file by loading it into memory.

§Example
let reader = maxminddb::Reader::open_readfile("test-data/test-data/GeoIP2-City-Test.mmdb").unwrap();
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impl<'de, S: AsRef<[u8]>> Reader<S>

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pub fn from_source(buf: S) -> Result<Reader<S>, MaxMindDbError>

Open a MaxMind DB database from anything that implements AsRef<u8>

§Example
use std::fs;
let buf = fs::read("test-data/test-data/GeoIP2-City-Test.mmdb").unwrap();
let reader = maxminddb::Reader::from_source(buf).unwrap();
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pub fn lookup<T>( &'de self, address: IpAddr, ) -> Result<Option<T>, MaxMindDbError>
where T: Deserialize<'de>,

Lookup the socket address in the opened MaxMind DB. Returns Ok(None) if the address is not found in the database.

Example:

let reader = maxminddb::Reader::open_readfile("test-data/test-data/GeoIP2-City-Test.mmdb")?;

let ip: IpAddr = FromStr::from_str("89.160.20.128").unwrap();
if let Some(city) = reader.lookup::<geoip2::City>(ip)? {
    println!("{:?}", city);
} else {
    println!("Address not found");
}
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pub fn lookup_prefix<T>( &'de self, address: IpAddr, ) -> Result<(Option<T>, usize), MaxMindDbError>
where T: Deserialize<'de>,

Lookup the socket address in the opened MaxMind DB, returning the found value (if any) and the prefix length of the network associated with the lookup.

Returns Ok((None, prefix_len)) if the address is found in the tree but has no data record. Returns Err(...) for database errors (IO, corruption, decoding).

Example:

let reader = maxminddb::Reader::open_readfile("test-data/test-data/GeoIP2-City-Test.mmdb")?;

let ip: IpAddr = "89.160.20.128".parse().unwrap(); // Known IP
let ip_unknown: IpAddr = "10.0.0.1".parse().unwrap(); // Unknown IP

let (city_option, prefix_len) = reader.lookup_prefix::<geoip2::City>(ip)?;
if let Some(city) = city_option {
    println!("Found {:?} at prefix length {}", city.city.unwrap().names.unwrap().get("en").unwrap(), prefix_len);
} else {
    // This case is less likely with lookup_prefix if the IP resolves in the tree
    println!("IP found in tree but no data (prefix_len: {})", prefix_len);
}

let (city_option_unknown, prefix_len_unknown) = reader.lookup_prefix::<geoip2::City>(ip_unknown)?;
assert!(city_option_unknown.is_none());
println!("Unknown IP resolved to prefix_len: {}", prefix_len_unknown);
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pub fn within<T>( &'de self, cidr: IpNetwork, ) -> Result<Within<'de, T, S>, MaxMindDbError>
where T: Deserialize<'de>,

Iterate over blocks of IP networks in the opened MaxMind DB

Example:

use ipnetwork::IpNetwork;
use maxminddb::{geoip2, Within};

let reader = maxminddb::Reader::open_readfile("test-data/test-data/GeoIP2-City-Test.mmdb").unwrap();

let ip_net = IpNetwork::V6("::/0".parse().unwrap());
let mut iter: Within<geoip2::City, _> = reader.within(ip_net).unwrap();
while let Some(next) = iter.next() {
    let item = next.unwrap();
    println!("ip_net={}, city={:?}", item.ip_net, item.info);
}

Trait Implementations§

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impl<S: Debug + AsRef<[u8]>> Debug for Reader<S>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<S> Freeze for Reader<S>
where S: Freeze,

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impl<S> RefUnwindSafe for Reader<S>
where S: RefUnwindSafe,

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impl<S> Send for Reader<S>
where S: Send,

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impl<S> Sync for Reader<S>
where S: Sync,

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impl<S> Unpin for Reader<S>
where S: Unpin,

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impl<S> UnwindSafe for Reader<S>
where S: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.