An example contract for Solana and the Anchor library (#82)

Author: yhzhang0128

examples/sol-anchor-contract/.gitignore

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+yarn.lock
+Cargo.lock
+.anchor
+.DS_Store
+target
+**/*.rs.bk
+node_modules
+test-ledger

examples/sol-anchor-contract/Anchor.toml

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+[programs.devnet]
+example_sol_anchor_contract = "Fwn1fCmbjd8d95hxY9NUUr5Xa7D13khveMnmCUFdd3ah"
+
+[provider]
+cluster = "devnet"
+wallet = "~/.config/solana/id.json"
+
+[scripts]
+install = "npm install"
+test = "yarn run ts-mocha -p ./tsconfig.json -t 1000000 scripts/test.ts"

examples/sol-anchor-contract/Cargo.toml

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+[workspace]
+members = [
+    "programs/*"
+]
+
+[profile.release]
+overflow-checks = true
+lto = "fat"
+codegen-units = 1
+[profile.release.build-override]
+opt-level = 3
+incremental = false
+codegen-units = 1

examples/sol-anchor-contract/README.md

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+# Pyth SDK Example Program for Solana and the Anchor Library
+
+This example implements the same functionalities as the `sol-contract` example.
+The difference is that this example uses the `anchor` library while the `sol-contract` example uses the lower-level solana interface.
+Please refer to the README of `sol-contract` for a description of the functionalities.
+
+## Run this program
+We assume that you have installed `anchor`, `npm` and `yarn`.
+
+```shell
+# Generate the program key
+> solana-keygen new -o program_address.json
+
+# Use the pubkey generated to replace the following two places
+# "example_sol_anchor_contract" in Anchor.toml
+# "declare_id!()" in programs/example-sol-anchor-contract/src/lib.rs
+
+# Enter the directory and build this example
+> cd examples/sol-contract-anchor
+> anchor build
+
+# Change the `wallet` field in Anchor.toml to your own wallet
+# And then deploy the example contract; An error may occur if
+# your wallet does not have enough funds
+> anchor deploy --program-keypair program_address.json --program-name example-sol-anchor-contract
+
+# Install the client dependencies and invoke this program
+> anchor run install
+> anchor run invoke
+```